| 稳定核^91Zr高自旋态实验研究 |
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| 引用本文： | 何龙,张玉虎,周小红,柳敏良,郭应祥,王志刚,丁兵,方永得,王建国,马飞,王思成,高丙水,李仕成,颜鑫亮,方芳,吴晓光,贺创业,郑云,王治民.稳定核^91Zr高自旋态实验研究[J].中国科学:物理学 力学 天文学,2012(3):249-258. |
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| 作者姓名： | 何龙 张玉虎 周小红 柳敏良 郭应祥 王志刚 丁兵 方永得 王建国 马飞 王思成 高丙水 李仕成 颜鑫亮 方芳 吴晓光 贺创业 郑云 王治民 |
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| 作者单位： | [1]中国科学院近代物理研究所,兰州730000 [2]中国科学院研究生院,北京100049 [3]中国原子能科学研究院,北京102413 |
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| 基金项目： | 国家自然科学基金资助项目（批准号：10825522,11175217） |
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| 摘 要： | 利用能量为44MeV的13C束流,通过重离子熔合蒸发反应82Se（13C,4n）91Zr布居了稳定核91Zr的高自旋态.基于γ-γ符合关系扩展了91Zr21/2＋同核异能态上的能级纲图,根据实验提取的γ跃迁的角分布系数对部分能级的自旋进行了指认.前人对21/2＋同核异能态下正负宇称能级已指认为质子在π（p1/2,g9/2）轨道的激发耦合价中子vd5/2;在π（f5/2,p3/2,p1/2,g9/2）和v（d5/2,s1/2,d3/2,g7/2,h11/2）空间内,经过系统性的分析和比较91Zr邻近核高自旋态能级结构,指出同核异能态上正宇称态激发机制依次为质子跨越38子壳π（f5/2,p3/2）→πp1/2激发和中子跨越50闭壳vg9/2→vd5/2激发,同核异能态上负宇称态可能涉及质子跨越38子壳π（f5/2,p3/2）→πg9/2激发与价中子vd5/2→vh11/2激发的竞争.
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| 关 键 词： | 高自旋态 能级纲图 组态 |
Experimental study of high-spin states in stable nucleus 91Zr |
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| HE Long,ZHANG YuHu,.,ZHOU XiaoHong,LIU MinLiang,GUO YingXiang,WANG ZhiGang,DING Bing,FANG YongDe,WANG JianGuo,MA Fei,WANG SiCheng,GAO BingShui,LI ShiCheng,YAN XinLiang,FANG Fang,WU XiaoGuang,HE ChuangYe,ZHENG Yun,＆ WANG ZhiMin.Experimental study of high-spin states in stable nucleus 91Zr[J].Scientia Sinica Pysica,Mechanica & Astronomica,2012(3):249-258. |
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| Authors: | HE Long ZHANG YuHu ZHOU XiaoHong LIU MinLiang GUO YingXiang WANG ZhiGang DING Bing FANG YongDe WANG JianGuo MA Fei WANG SiCheng GAO BingShui LI ShiCheng YAN XinLiang FANG Fang WU XiaoGuang HE ChuangYe ZHENG Yun ＆ WANG ZhiMin |
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| Institution: | 1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China; 3 China Institute of Atomic Energy, Beijing 102413, China) |
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| Abstract: | High spin states of stable nucleus 91Zr have been studied with the 82Se（13C, 4n）91Zr fusion evaporation reaction at an incident beam energy of 44 MeV. Based on γ-γ, coincidence relationships and ADO ratios, the level scheme of 91Zr above the 21/2＋ isomer has been extended and the spins of partial states have been assigned. It has been shown that the low-lying levels below the 21/2＋ isomer are dominated by the proton excitations within the π（p1/2, g9/2） shell model orbitals. According to systematic analysis and comparison with neighboring nuclei, the positive-parity states above the 21/2＋ isomer can be understood as the proton excitations within the π（f5/2, P3/2, Pl/2） shell model orbitals and one neutron excitation across the N=50 shell gap （vg9/2--~vds/2）, the negative levels above the 21/2＋ isomer might concern competition between one proton excitation across the Z=38 shell gap （n（fs/2, p3/2）→（f5/2） and the neutron excitation within （vds/2, vhw2） shell model orbitals. |
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| Keywords: | high spin state level scheme configuration |
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