Observation of high-j quasiparticle states in Cm249 by in-beam γ-ray spectroscopy using heavy-ion transfer reactions

作     者：T. Ishii H. Makii M. Asai K. Tsukada A. Toyoshima M. Matsuda A. Makishima S. Shigematsu J. Kaneko T. Shizuma H. Toume I. Hossain T. Kohno M. Ogawa 

作者机构：Department of Research Reactor and Tandem Accelerator Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Institute of Particle and Nuclear Studies High Energy Accelerator Research Organization (KEK) Tokai Ibaraki 319-1195 Japan Department of Liberal Arts and Sciences National Defense Medical College Tokorozawa Saitama 359-8513 Japan Department of Energy Sciences Tokyo Institute of Technology Yokohama 226-8502 Japan Department of Radiological Sciences Komazawa University Setagaya Tokyo 154-8525 Japan Quantum Beam Science Directorate Japan Atomic Energy Agency Kyoto 619-0215 Japan College of Science Ibaraki University Mito Ibaraki 310-8512 Japan Department of Physics Osaka University Toyonaka Osaka 560-0043 Japan 

出 版 物：《Physical Review C》 (物理学评论C辑：核物理学)

年 卷 期：2008年第78卷第5期

页      面：054309-054309页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：JSPS 

摘      要：We have measured de-excitation γ rays in Cm249 populated by one-neutron stripping reactions with a Cm248 target and 162-MeV O16, 162-MeV O18, and 120-MeV C13 beams. γ rays in Cm249 were identified by measuring kinetic energies of outgoing particles using Si ΔE−E detectors. It was demonstrated that high-j orbitals were selectively populated in the (O16, O15) reaction having a large negative Q value. We have observed eight quasiparticle states above the deformed shell gap of N=152. The 1/2+[620], 1/2−[750], and 7/2+[613] bands were extended up to 19/2+, 19/2−, and 13/2+ states, respectively. We have established the 9/2 9/2+[615] state at 526 keV, the 9/2 9/2+[604] state with a short life of T1/2≪2 ps at 1030 keV, and the 11/2 11/2−[725] state with T1/2=19(1) ns at 375 keV. Furthermore, the 17/2 1/2+[880] state, having a large component of the k17/2 spherical single-particle state, has been identified at 1505 keV. We discuss the properties of those quasiparticle states in the framework of a deformed shell model.