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| 1 | Structure analysis of ^(159)Sm and properties of odd-mass neutron-rich nuclei in mass-160 region显示文摘Recent fission experiment data provide interesting structure information for neutron-rich nuclei in the mass A ~ 160 region. We apply the projected shell model to study the strongly-deformed, neutron-rich Sm isotopes. We perform calculations for rotational bands up to spin I = 20 (29/2) for even-even (odd-neutron) Sm isotopes, and analyze the band structure of low-lying states with quasiparticle excitations. Emphasis is given to rotational bands based on one-quasiparticle (1-qp) configurations in the odd-mass 159Sm. The 159 Sm result is discussed together with those of the even-even isotopes 158,160Sm. New bands in 159Sm based on neutron 1-qp 1/2 and 5/2+ configurations are predicted. Electromagnetic transition probabilities are discussed. | YANG YingChun1 & SUN Yang1,2,3 1 Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China 2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China 3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S1： | 7 |
| 2 | A possible proton pygmy resonance in ^(17)Ne显示文摘The low-lying electric dipole strengths in proton-rich nuclei 17F and 17Ne, which can be produced at HIRFL-CSR in Lanzhou, are investigated. In the framework of the covariant density functional theory the self-consistent relativistic Hartree Bogoliubov model and the relativistic quasiparticle random phase approximation with the NL3 parameter set and Gogny pairing interaction are adopted in the calculations. A pronounced dipole peak appears below 10 MeV in17Ne, but does not occur in 17F. The prop erties of this low-lying E1 excitation in 17Ne are studied, which may correspond to a proton pygmy resonance with different characteristics from those of giant dipole resonance. | MA ZhongYu1,2 & TIAN Yuan1 1 China Institute of Atomic Energy, Beijing 102413, China 2 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Collision, Lanzhou 730000, China | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，S1： | 0 |
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