丰中子核同质异能态及A＝120区缺中子核高自旋态研究

This research program belongs to an important area of the nuclear structure under extreme condition?the experimental research on the nuclear high spin states. There is a sharply competition on the international nuclear research groups in this area. The research contents include the high spin states of the neutron-rich nuclei around A=110-140 region and the neutron-deficient ones around A=120-130 region. In the neutron-rich region, through international co-operation with the foreign research groups and the advanced laboratory, we have performed deeply research on the isomers of the neutron-rich nuclei and completed primarily research of the isomers in neutron-rich odd-A Ru nuclei. This research will provide a new method for searching of isomers in neutron-rich nuclei. On the other hand, we have finished the research on high spin states in neutron-rich 107Ru，110Ru ，113Ru，104Mo and 106Mo nuclei. The collective rotation bands in 113Ru have been identified for the first time. The high spin level scheme of 107Ru was reinvestigated and newly established. As a result, the previous wrong level scheme of 107Ru published by a foreign group has been denied by our work. Many new levels and quasiparticle bands in 104Mo、106Mo and 110Ru have been discovered. Particularly, an important chiral band structure was proposed in 106Mo for the first time in this region. Besides, the octupole deformation in 141Ba、139Xe,the intrude band in 118Pd and the shifted identical bands in neutron-rich nuclear region were studied by foreign co-operators. For the neutron-deficient nuclei, high spin state research on 122Ba and 136Ce in A=120-130 region has been performed using heavy ion accelerators and the measurement arrays of in-beam g-ray spectroscopy at the National Key Laboratories in China Institute of Atomic Energy, Beijing and Institute of Modern Physics, China Academy of Science, Lanzhou. The important negative parity band and strong octupole correlations in 122Ba were observed for the first time. It provides another evidence for the octupole deformation quantum numbers of N,Z=56.The data analyzing of 136Ce has been finished. A high deformation band and some oblate deformation bands with multi-quasiparticle configulations were found in 136Ce. Our research provides important experimental results for the nuclear structure and the strange deformation in neutron-rich and A=130 regions. The work was highly appreciated by the scientists at home and abroad.

通过对锎252裂变瞬发γ谱延是符合测量与数据分析，寻找A=100-150区众多丰中子核的同室炷芴治銎渥樘匦裕て诮行矶嘈碌慕峁Ｓ迷谑闷资笛榧际酰訟＝120缺中雍饲谋怠さ群私懈咦孕芯浚胖匮芯砍ね帧⒈馔钟肴嵝伪洌巫辞в?回弯机制以及旋称反转等效应，对理解此核区核结构特性具有重要意义。