1Engineering Research Center of Nuclear Technology Application (Ministry of Education), East China Institute of Technology, Nanchang 330013 2School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand 3International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016 4Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Fuzhou 344000 5State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 6Thailand Center of Excellence in Physics (ThEP), Commission on Higher Education, 328 Si Ayutthaya Road, Ratchathewi, Bangkok 10400, Thailand 7China Institute of Atomic Energy, P.O. Box 275(10), Beijing 102413 8College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875
1Engineering Research Center of Nuclear Technology Application (Ministry of Education), East China Institute of Technology, Nanchang 330013 2School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand 3International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016 4Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China Institute of Technology, Fuzhou 344000 5State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 6Thailand Center of Excellence in Physics (ThEP), Commission on Higher Education, 328 Si Ayutthaya Road, Ratchathewi, Bangkok 10400, Thailand 7China Institute of Atomic Energy, P.O. Box 275(10), Beijing 102413 8College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875
摘要We investigate the structure of yrast bands in the transuranium nuclei 242Pu and 244Pu in the framework of the projected shell model, which is a fully quantum mechanical and microscopic approach. It is found that an appropriate modification of the standard Nilsson spin−orbital parameters in the N=6 proton shell is necessary to correctly describe the high−spin backbending phenomenon in nucleus 244Pu. In order to test whether this modification is correct, the same modified parameters are used to calculate the yrast band of its neighboring isotope 242Pu. It is found that without this modification, a backbending will occur at spin I=20, which is not supported by the experimental data.
Abstract：We investigate the structure of yrast bands in the transuranium nuclei 242Pu and 244Pu in the framework of the projected shell model, which is a fully quantum mechanical and microscopic approach. It is found that an appropriate modification of the standard Nilsson spin−orbital parameters in the N=6 proton shell is necessary to correctly describe the high−spin backbending phenomenon in nucleus 244Pu. In order to test whether this modification is correct, the same modified parameters are used to calculate the yrast band of its neighboring isotope 242Pu. It is found that without this modification, a backbending will occur at spin I=20, which is not supported by the experimental data.
2012, Vol. 29 
