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Production of ω mesons in p + p, d + Au, Cu + Cu, and Au + Au collisions at sNN=200 GeV

Physical Review C 2011年第4期84卷 044902-044902页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh A. Al-Jamel J. Alexander A. Angerami K. Aoki N. Apadula L. Aphecetche Y. Aramaki R. Armendariz S. H. Aronson J. Asai E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis F. Bauer C. Baumann A. Bazilevsky S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov J. H. Bhom A. A. Bickley M. T. Bjorndal D. S. Blau J. G. Boissevain J. S. Bok H. Borel K. Boyle M. L. Brooks D. S. Brown D. Bucher H. Buesching V. Bumazhnov G. Bunce J. M. Burward-Hoy S. Butsyk C. M. Camacho S. Campbell A. Caringi J.-S. Chai B. S. Chang J.-L. Charvet C.-H. Chen S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. B. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung A. Churyn O. Chvala V. Cianciolo Z. Citron C. R. Cleven Y. Cobigo B. A. Cole M. P. Comets Z. Conesa del Valle M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev K. Das A. Datta G. David M. K. Dayananda M. B. Deaton K. Dehmelt H. Delagrange A. Denisov D. d’Enterria A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch A. Dion M. Donadelli J. L. Drachenberg O. Drapier A. Drees K. A. Drees A. K. Dubey J. M. Durham A. Durum D. Dutta V. Dzhordzhadze L. D’Orazio S. Edwards Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam T. Engelmore A. Enokizono H. En'yo B. Espagnon S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger M. Finger, Jr F. Fleuret S. L. Fokin B. Forestier Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao S.-Y. Fung T. Fusayasu S. Gadrat I. Garishvili F. Gastineau M. Germain A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene G. Grim M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty M. N. Hagiwara K. I. Hahn H. Hamagaki J. Hamblen R. Han J. Hanks H. Harada E. P. Hartouni K. Haruna M. Harvey E. Haslum K. Hasuko R. Hayano X. He M University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3400 USA SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes France Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut fur Kernphysik University of Muenster D-48149 Muenster Germany Iowa State University Ames Iowa 5001

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured ω meson production via leptonic and hadronic decay channels in p+p, d+Au, Cu+Cu, and Au+Au collisions at sNN = 200 GeV. The invariant transverse momentum spectra measured in different decay modes give consistent results. Measurements in the hadronic decay channel in Cu+Cu and Au+Au collisions show that ω production has a suppression pattern at high transverse momentum, similar to that of π0 and η in central collisions, but no suppression is observed in peripheral collisions. The nuclear modification factors, RAA, are consistent in Cu+Cu and Au+Au collisions at similar numbers of participant nucleons.

关键词： MESONS LEPTONS (nuclear physics) -- Decay HADRONS -- Decay COLLISIONS (nuclear physics) NUCLEON-nucleon interactions

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Suppression of away-side jet fragments with respect to the reaction plane in Au + Au collisions at sNN=200 GeV

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Physical Review C 2011年第2期84卷 024904-024904页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche Y. Aramaki J. Asai E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain J. S. Bok H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell B. S. Chang W. C. Chang J.-L. Charvet C.-H. Chen S. Chernichenko C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung A. Churyn O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev K. Das A. Datta G. David A. Denisov D. d’Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees A. K. Dubey J. M. Durham A. Durum D. Dutta V. Dzhordzhadze S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson A. Hadj Henni J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen R. Han J. Hanks E. P. Hartouni K. Haruna E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang T. Ichihara R. Ichimiya J. Ide H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B. V. Jacak J. Jia J. Jin B. M. Johnson K. S. Joo D. Jouan D. S. Jumper F. Kajihara S. Kametani N. Kamihara J. Kamin J. H. Kang J. Kapustinsky K. Karatsu D. Kawall M. Kawashima A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima J. Kikuchi B. University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722 F-44307 Nantes France Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3400 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut fur Kernphysik University of Muenster D-48149 Muenster Germany Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg State Polytechnic University St. Petersburg 195251 Russia Yons

Pair correlations between large transverse momentum neutral pion triggers (pT=4--7 GeV/c) and charged hadron partners (pT=3--7 GeV/c) in central (0%–20%) and midcentral (20%–60%) Au+Au collisions at sNN=200 GeV are presented as a function of trigger orientation with respect to the reaction plane. The particles are at larger momentum than where jet shape modifications have been observed, and the correlations are sensitive to the energy loss of partons traveling through hot dense matter. An out-of-plane trigger particle produces only 26±20% of the away-side pairs that are observed opposite of an in-plane trigger particle for midcentral (20%–60%) collisions. In contrast, near-side jet fragments are consistent with no suppression or dependence on trigger orientation with respect to the reaction plane. These observations are qualitatively consistent with a picture of little near-side parton energy loss either due to surface bias or fluctuations and increased away-side parton energy loss due to a long path through the medium. The away-side suppression as a function of reaction-plane angle is shown to be sensitive to both the energy loss mechanism and the space-time evolution of heavy-ion collisions.

关键词： Collisions energy losses Planing side jet flow Fragments

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Azimuthal correlations of electrons from heavy-flavor decay with hadrons in p+p and Au+Au collisions at sNN=200 GeV

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Physical Review C 2011年第4期83卷 044912-044912页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche Y. Aramaki J. Asai E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain J. S. Bok H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell B. S. Chang W. C. Chang J.-L. Charvet C.-H. Chen S. Chernichenko C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung A. Churyn O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev K. Das A. Datta G. David A. Denisov D. d’Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees A. K. Dubey J. M. Durham A. Durum D. Dutta V. Dzhordzhadze S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger, Jr. M. Finger F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson A. Hadj Henni J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen J. Hanks R. Han E. P. Hartouni K. Haruna E. Haslum R. Hayano M. Heffner T. K. Hemmick T. Hester X. He J. C. Hill M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang T. Ichihara R. Ichimiya J. Ide H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B. V. Jacak J. Jia J. Jin B. M. Johnson K. S. Joo D. Jouan D. S. Jumper F. Kajihara S. Kametani N. Kamihara J. Kamin J. H. Kang J. Kapustinsky K. Karatsu D. Kawall M. Kawashima A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima J. Kikuchi B. University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes BP 20722 F-44307 Nantes France Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3400 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California—Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut fur Kernphysik University of Muenster D-48149 Muenster Germany Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg State Polytechnic University St. Petersburg Russia Yonsei Unive

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled p+p collisions. These measurements indicate that charm and bottom quarks interact with the hot dense matter produced in heavy-ion collisions much more than expected. Here we extend these studies to two-particle correlations where one particle is an electron from the decay of a heavy-flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interactions between heavy quarks and the matter, such as whether the modification of the away-side-jet shape seen in hadron-hadron correlations is present when the trigger particle is from heavy-meson decay and whether the overall level of away-side-jet suppression is consistent. We statistically subtract correlations of electrons arising from background sources from the inclusive electron-hadron correlations and obtain two-particle azimuthal correlations at sNN=200 GeV between electrons from heavy-flavor decay with charged hadrons in p+p and also first results in Au+Au collisions. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to p+p collisions.

关键词： ELECTRONS COLLISIONS (nuclear physics) PARTICLES (nuclear physics) nuclear reactions nuclear physics

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Identified charged hadron production in p+p collisions at s=200 and 62.4 GeV

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Physical Review C 2011年第6期83卷 064903-064903页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander K. Aoki L. Aphecetche R. Armendariz S. H. Aronson J. Asai E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley J. G. Boissevain H. Borel K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell B. S. Chang W. C. Chang J.-L. Charvet S. Chernichenko J. Chiba C. Y. Chi M. Chiu I. J. Choi R. K. Choudhury T. Chujo P. Chung A. Churyn V. Cianciolo Z. Citron C. R. Cleven B. A. Cole M. P. Comets P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku K. Das G. David M. B. Deaton K. Dehmelt H. Delagrange A. Denisov D. d’Enterria A. Deshpande E. J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees A. K. Dubey A. Durum D. Dutta V. Dzhordzhadze Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam T. Engelmore A. Enokizono H. En’yo S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger, Jr. M. Finger F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat I. Garishvili A. Glenn H. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty H. Hamagaki R. Han H. Harada E. P. Hartouni K. Haruna E. Haslum R. Hayano M. Heffner T. K. Hemmick T. Hester X. He H. Hiejima J. C. Hill R. Hobbs M. Hohlmann W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback S. Huang T. Ichihara R. Ichimiya H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba Y. Inoue D. Isenhower L. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev B. V. Jacak J. Jia J. Jin O. Jinnouchi B. M. Johnson K. S. Joo D. Jouan F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J. H. Kang H. Kanou J. Kapustinsky D. Kawall A. V. Kazantsev T. Kempel University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Kyoto University Kyoto 606-8502 Japan SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) Boîte Postale 20722-44307 Nantes France Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3400 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California–Riverside Riverside California 92521 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster Germany Saint Petersburg State Polytechnic University Saint Petersburg 195251 Russia Yonsei University IPAP Seoul 120-749 Korea Institute of Physics

Transverse momentum distributions and yields for π±, K±, p, and p̄ in p+p collisions at s = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). These data provide important baseline spectra for comparisons with identified particle spectra in heavy ion collisions at RHIC. We present the inverse slope parameter Tinv, mean transverse momentum 〈pT〉, and yield per unit rapidity dN/dy at each energy, and compare them to other measurements at different s in p+p and p+p̄ collisions. We also present the scaling properties such as mT scaling and xT scaling on the pT spectra between different energies. To discuss the mechanism of the particle production in p+p collisions, the measured spectra are compared to next-to-leading-order or next-to-leading-logarithmic perturbative quantum chromodynamics calculations.

关键词： HADRON colliders QUANTUM theory IONS LOGARITHMIC functions PARTICLES (nuclear physics)

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VAMDC—The Virtual Atomic and Molecular data Centre—A New Way to Disseminate Atomic and Molecular data—VAMDC Level 1 Release

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AIP Conference Proceedings 2011年第1期1344卷 107-115页

作者： G. Rixon M. L. Dubernet N. Piskunov N. Walton N. Mason P. Le Sidaner S. Schlemmer J. Tennyson A. Akram K. Benson J. Bureau M. Doronin C. Endres U. Heiter C. Hill F. Kupka L. Nenadovic T. Marquart G. Mulas Y. Ralchenko A. Shih K. Smith B. Schmitt D. Witherick V. Boudon J. L. Culhane M. S. Dimitrijevic A. Z. Fazliev C. Joblin G. Leto P. A. Loboda H. E. Mason C. Mendoza T. J. Millar L. A. Nunez V. I. Perevalov L. S. Rothman E. Roueff T. A. Ryabchikova A. Ryabtsev S. Sahal‐Bréchot V. G. Tyuterev V. Wakelam C. J. Zeippen aInstitute of Astronomy University of Cambridge Madingley Road Cambridge CB3 0HA UK bLaboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique UMR7092 CNRS/INP Université Pierre et Marie Curie Case 76 4 Place Jussieu 75252 Paris Cedex 05 France cLaboratoire Univers et Théories UMR8102 CNRS/INSU Observatoire de Paris Section Meudon 5 Place Janssen 92195 Meudon Cedex France dUppsala University Department of Physics and Astronomy Lägerhyddsvägen 1 Uppsala 75120 Sweden eInstitute of Astronomy University of Cambridge Madingley Road Cambridge CB30HA UK fOpen University Faculty of Science Walton Hall Milton Keynes MK7 6AA UK gDivision Informatique de l’Observatoire VO‐Paris Data Centre UMS2201 CNRS/INSU Observatoire de Paris 5 Place Janssen 92195 Meudon Cedex France hUniversity of Cologne I. Physikalishes Institut Zuelpicher Strasse 77 Koeln 50937 Germany iDepartment of Physics and Astronomy University College London London WC1E 6BT UK jMullard Space Science Laboratory University College London Holmbury St Mary Dorking Surrey RH5 6NT UK kLaboratoire de Physique Moléculaire pour l’Atmosphère et l’Astrophysique UMR7092 CNRS/INP Université Pierre et Marie Curie Case 76 4 Place Jussieu 75252 Paris Cedex 05 France lFaculty of Mathematics University of Vienna Nordbergstrasse 15 1090 Wien Austria mIstituto Nazionale di Astrofisica ‐ Osservatorio Astronomico di Cagliari strada 54 loc. Poggio dei Pini Capoterra (CA) I‐09012 Italy nNational Institute of Standards and Technology Atomic Physics Division 100 Bureau Dr. Stop 8422 Gaithersburg MD 20899‐8422 USA oSchool of Mathematics and Physics Queen’s University Belfast University Road Belfast BT7 1NN UK pLaboratoire de Planétologie de Grenoble UMR5109 CNRS/INSU Université Joseph Fourier BP53 38041 Grenoble Cedex 9 France qLaboratoire Interdisciplinaire Carnot de Bourgogne UMR 5209 CNRS‐Université de Bourgogne 9 Avenue Alain Savary BP 47 870 F‐21078 DIJON Cedex rAstronomical Observatory

The Virtual Atomic and Molecular data Centre (VAMDC, http://***/) is a European‐Union‐funded collaboration between groups involved in the generation, evaluation, and use of atomic and molecular data. VAMDC aims to build a reliable, open, flexible and interoperable e‐science interface to existing atomic and molecular data. The project will cover establishing the core consortium, the development and deployment of the infrastructure and the development of interfaces to the existing atomic and molecular databases. This paper describes the organisation of the project and the achievements during its first year.

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Measurement of E1 and E2 cross sections of 12C(α,γ)16O using pulsed α beams

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AIP Conference Proceedings 2009年第1期1120卷 284-288页

作者： H. Makii Y. Nagai K. Mishima M. Segawa T. Shima H. Ueda M. Igashira aInstitute for nuclear and particle physics High Energy Accelerator Research Organization Tsukuba Ibaraki 305‐0801 Japan bDivision of Nuclear Data and Reactor Engineering Japan Atomic Energy Agency Tokai Ibaraki 319‐1195 Japan cResearch Center for Nuclear Physics Osaka University Ibaraki Osaka 567‐0047 Japan dInstitute of Materials Structure Science High Energy Accelerator Research Organization Tsukuba Ibaraki 305‐0801 Japan eQuantum Beam Science Directorate Japan Atomic Energy Agency Tokai Ibaraki 319‐1195 Japan fResearch Laboratory for Nuclear Reactors Tokyo Institute of Technology Meguro Tokyo 152‐8550 Japan

We have measured the γ‐ray angular distribution of the 12C(α,γ)16O reaction at a center‐of‐mass energy of Ecm = 1.6 MeV and Ecm = 1.4 MeV. In this experiment, we used high efficiency anti‐Compton NaI(Tl) spectrometers to detect a γ‐ray from the reaction with a large S/N ratio, intense pulsed α beams to discriminate true events from neutron induced background by using a time‐of‐flight (TOF) method, and the monitoring system of target thickness. We could pick up true events from the reaction free from intense neutron background with high statistics.

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Role of multiparticle-multihole states of O18,19 in O18(n,γ)O19 reactions at keV energy

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Physical Review C 2008年第5期77卷 051303(R)-051303(R)页

作者： T. Ohsaki M. Igashira Y. Nagai M. Segawa K. Muto Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2-12-1 O-okayama Meguro Toyo 152-8550 Japan Research Center for Nuclear Physics Osaka University Ibaraki Osaka 667-0047 Japan Division of Nuclear Data and Reactor Engineering Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Quantum Beam Science Directorate Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Department of Physics Tokyo Institute of Technology 2-12-1 O-okayama Meguro Tokyo 152-8551 Japan

We have determined for the first time the partial-capture cross sections for discrete γ rays from neutron capture by O18 to the 5/2+ground, 1/2+second, and 3/2+ first excited states in O19 at 10⩽En⩽80 keV. The first two cross sections agree with the calculated ones based on a nonresonant direct p-wave capture by O18 within a factor of two. On the other hand, the cross section to the 3/2+ state with a three-particle (d5/2)3configuration was found to be about 180 times larger than the calculated one. We discussed a possible origin of the large discrepancy by referring to recent results of O18(n,γ)O19 at thermal energy.

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Role of multiparticle-multihole states in O18,19 in thermal neutron capture of O18

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Physical Review C 2007年第5期76卷 051301(R)-051301(R)页

作者： Y. Nagai M. Segawa T. Ohsaki H. Matsue K. Muto Research Center for Nuclear Physics Osaka University. Ibaraki Osaka 567-0047 Japan Division of Nuclear Data and Reactor Engineering Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Quantum Beam Science Directorate Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2-12-1 O-okayama Meguro Tokyo 152-8550 Japan Department of Physics Tokyo Institute of Technology 2-12-1 O-okayama Meguro Tokyo 152-8551 Japan

The primary E1γ-ray transition strength from the thermal neutron capture of O18 to the 3/2− state, 18 keV below the neutron threshold of O19, was found to be about 2×105 stronger than that to the 1/2− excited state, 729 keV below the threshold. In addition, the E1 strength from the 3/2− state leading to the 3/2+ state with three (d5/2)3 neutrons was more than six times stronger compared to that to the 5/2+ ground state with a single (d5/2) neutron. These anomalous γ-ray decay patterns give the first clear experimental evidence for the predicted property of the 3/2− state as mainly having a one-hole-four-particle configuration. Unique features of the O18 ground state with a two-hole-four-particle configuration and of the 3/2+ state combined with a discrete prompt γ-ray spectroscopy following the thermal neutron capture of O18 enabled us to exclusively identify the configuration of the 3/2− state.

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Development of nuclear data Processing and Utilization System for Innovative Reactors

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AIP Conference Proceedings 2005年第1期769卷 109-112页

作者： N. Yamano A. Hasegawa K. Kato M. Igashira *Research Laboratory for Nuclear Reactors Tokyo Institute of Technology 2‐12‐1 O‐okayama Meguro‐ku Tokyo 152‐8550 JAPAN **Nuclear Data Center Japan Atomic Energy Research Institute †Division of Physics Graduate School of Science Hokkaido University

A research and development (R&D) project on a nuclear data processing and utilization system was started in 2002 for a five‐year plan for innovative nuclear energy systems such as innovative reactors and accelerator‐driven systems. The nuclear data processing and utilization system is being developed to use on a PC‐Linux server through the Internet, so that it has a graphic user interface (GUI) in order to easily utilize the system for various nuclear design studies in the innovative reactor development. The nuclear data processing and utilization system, which is able to handle JENDL‐3.3, ENDF/B‐VI, and JEFF‐3 to generate point‐wise and group‐wise cross sections in several formats, has the capability to perform criticality and shielding benchmarks. A prototype system was developed in order to examine the operability of the user interface and discuss detailed specifications of the system. The system is expected to be a verification tool of nuclear data for development of innovative nuclear reactors, because cross‐section generation with nuclear data and the various benchmarks for criticality and shielding problems can be easily performed.

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Measurement of Total Cross Sections at Pohang Neutron Facility

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AIP Conference Proceedings 2005年第1期769卷 740-743页

作者： Guinyun Kim A. K. M. M. H. Meaze Hossain Ahmed Dongchul Son Young Seok Lee Hengsik Kang Moo‐Hyun Cho In Soo Ko Won Namkung Tae‐Ik. Ro Won‐Chung Chung Young Ae Kim Kun Joong Yoo Jong Hwa Chang 1Department of Physics Kyungpook National University Daegu 702‐701 Korea 2Pohang Accelerator Laboratory Pohang University of Science and Technology Pohang 790 ‐ 784 Korea 3Department of Physics Dong‐A University Busan 604‐714 Korea 4Nuclear Data Evaluation Laboratory Korea Atomic Energy Research Institute Daejeon 305‐600 Korea

The Pohang Neutron Facility, which consists of an electron linear accelerator, a water‐cooled Ta target with a water moderator, and a time‐of‐flight path with an 11 m length has been operated since 2000. We report the status activities on the neutron total cross‐section measurements in the neutron energy region from 0.01 eV to 100 eV by the neutron time‐of‐flight method at Pohang Neutron Facility. A 6Li‐ZnS(Ag) scintillator with a diameter of 12.5 cm and a thickness of 1.5 cm has been used as a neutron detector. The background level has been determined by using notch‐filters of Co, In, and Cd sheets. In order to reduce the gamma rays from Bremsstrahlung and that from neutron capture, we have employed a neutron‐gamma separation system based on their different pulse shape. The present measurements for Ag, Hf, and Ta samples are compared with the previous ones and the evaluated data in ENDF/B‐VI. The resonance parameters for Ag and Hf samples have been extracted from the transmission data by using the SAMMY code.

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