FAMU: study of the energy dependent transfer rate Λ μp → μO

作     者：E Mocchiutti V Bonvicini M Danailov E Furlanetto K S Gadedjisso-Tossou D Guffaanti C Pizzolotto A Rachevski L Stoychev E Vallazza G Zampa J Niemela K Ishida A Adamczak G Baccolo R Benocci R Bertoni M Bonesini F Chignoli M Clemenza A Curioni V Maggi R Mazza M Moretti M Nastasi E Previtali D Bakalov P Danev M Stoilov G Baldazzi R Campana I D'Antone M Furini F Fuschino C Labanti A Margotti S Meneghini G Morgante L P Rignanese P L Rossi M Zuffa T Cervi A De Bari A Menegolli C De Vecchi R Nardò M Rossella A Tomaselli L Colace M De Vincenzi A Iaciofano F Somma L Tortora R Ramponi A Vacchi 

作者机构：National Institute for Nuclear Physics (INFN) Sezione di Trieste via A. Valerio 2 34127 Trieste1 Italy Elettra-Sincrotrone Trieste S.C.p.A. SS14 Km 163.5 34149 Basovizza Trieste Italy Mathematics and Informatics Department Udine University via delle Scienze 206 Udine Italy The Abdus Salam International Centre for Theoretical Physics Strada Costiera 11 Trieste Italy Laboratoire de Physique des Composants à Semi-conducteurs (LPCS) Département de physique Université de Lomé 01 BP 1515 Lomé Togo Gran Sasso Science Institute - INFN-LNGS via F. Crispi 7 L'Aquila Italy RIKEN-RAL RIKEN Nishina Center for Accelerator-Based Science 2-1 Hirosawa Wako Saitama 351-0198 Japan Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 PL31342 Kraków Poland National Institute for Nuclear Physics (INFN) Sezione di Milano Bicocca piazza della Scienza 3 Milano Italy Università di Milano Bicocca Dip. di Fisica 'G. Occhialini' piazza della Scienza 3 Milano Italy Università di Milano Bicocca Dip. di Scienze dell'Ambiente e della Terra piazza della Scienza 1 Miano Italy Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences blvd. Tsarigradsko ch. 72 Sofia 1142 Bulgaria National Institute for Nuclear Physics (INFN) Sezione di Bologna viale Berti Pichat 6/2 Bologna Italy Department of Physics and Astronomy University of Bologna viale Berti Pichat 6/2 Bologna Italy INAF-IAFS Bologna Area della Ricerca via P. Gobetti 101 Bologna Italy Department of Physics University of Pavia via Bassi 6 Pavia Italy National Institute for Nuclear Physics (INFN) Sezione di Pavia via Bassi 6 Pavia Italy Department of Electrical Computer and Biomedical Engineering University of Pavia via Ferrata 5 Pavia Italy National Institute for Nuclear Physics (INFN) Sezione di Roma Tre via della Vasca Navale 84 Roma Italy Dipartimento di Ingegneria Università degli Studi Roma Tre via V. Volterra 62 Roma Italy Dipartimento di Matematica e Fisica Università di Roma Tre via della Vasca Navale 84 Roma Italy Dipartimento di Scienze Università di Roma Tre viale G. Marconi 446 Roma Italy IFN-CNR Department of Physics - Politecnico di Milano and National Institute for Nuclear Physics (INFN) Sezione di Milano Politecnico piazza Leonardo da Vinci 32 20133 Milano Italy 

出 版 物：《Journal of Physics: Conference Series》 

年 卷 期：2018年第1138卷第1期

学科分类：07[理学] 0702[理学-物理学] 

摘      要：The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen ΔEhfs (μ - p)1S. The physical process behind this experiment is the following: μp are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy ΔEhfs ≈ 0.182 eV, in subsequent collisions with the surrounding H 2 molecules, the μp is quickly de-excited and accelerated by ~ 2/3 of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the μZ formed by muon transfer (μp) + Z → (μZ)* + p, a reaction whose rate depends on the μp kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the (μZ)* cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen (Λ μp → μ0 ), precisely measured for the first time.