共查询到20条相似文献,搜索用时 15 毫秒
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奇奇核170Ta高自旋态及旋称反转研究 总被引:1,自引:1,他引:0
用97MeV的19F束通过155Gd(19F,4n)170Ta反应布居了奇奇核170Ta的高自旋态,将170Ta的3个转动带推向了更高的自旋态,并观测到了半退耦带的旋称反转点,将其自旋值定在了19.5h.首次比较系统地总结了稀土区半退耦带的旋称反转系统规律,并比较了该核区半退耦带与晕带的系统性差异,特别是这两个带在能量劈裂程度上存在着系统性差异.从这一现象出发,探讨了半退耦带与晕带旋称反转系统性差异的成因,指出p-n剩余相互作用在这一现象中起着非常重要的作用. 相似文献
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在166MeV的束流能量下,利用重离子熔合蒸发反应142Nd(32S, 1p3nγ) 170Re布居了170Re的高自旋激发态. 用12套带BGO反康普顿抑制的高纯锗探测器阵列进行了在束X-γ和γ-γ符合测量. 基于对实验测量结果及周围邻近核已知信息的综合分析,首次建立了双奇核170Re的转动带能级纲图. 根据实验提取出的准粒子顺排、旋称劈裂等结构特征和Re双奇核同位素带结构系统学知识的比较分析,指出该带的准粒子组态是πh11/2(○×)υi13/2. 相似文献
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利用15 4 Sm( 31P ,5nγ) 180 Ir反应产生并研究了双奇核180 Ir的高自旋态 .实验中进行了180 Ir核的在束γ测量 ,包括γ射线的激发函数测量、X γ和γ γ符合测量 ,首次建立了双奇核180 Ir由 5个转动带构成的能级纲图 .依据从实验数据中提取出的带内B(M1 ) /B(E2 )值与理论计算值的比较 ,以及相邻双奇核的带结构特征 ,给出了转动带的准粒子组态 .在推转壳模型的理论框架中 ,定性地讨论了转动带结构特征的组态依赖性 相似文献
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YU Hai-Ping GUO Ying-Xiang LEI Xiang-Guo ZHANG Yu-Hu ZHOU Xiao-Hong LUO Peng LIU Min-Liang SONG Li-Tao WANG Hua-Lei XIE Cheng-Ying ZHENG Yong GUO Wen-Tao 《中国物理C(英文版)》2004,28(8):806-809
High spin level structure of doubly odd nucleus 140Pr has been investigated using in beam γ spectroscopy techniques by means of the 130Te(14N,4n)140Pr reaction at beam energy of 58MeV.γ-ray excitation functions,γ-ray singles and γ-γ-t coincidences were measured experimentally.The level scheme of 140Pr,including 27 new levels and 42 new γ-rays,was established for the first time up to 4717.3keV in excitation energy.Based on the measured γ-ray anisotropies,spin values were suggested to the levels in 140Pr.Several quasiparticle configurations are discussed on the basis of systematics in the neighboring odd odd nuclei,and interpreted qualitatively. 相似文献
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LI Rong-Jun MA Ying-Jun WU Xiao-Guang ZHANG Yu-Hu ZHU Li-Hua WANG Shou-Yu LI Ming-Fei LIANG Guo-Dong CUI Xing-Zhu LI Xian-Feng ZHAO Guang-Yi LU Jing-Bin 《中国物理C(英文版)》2005,29(1):1-4
Excited states in odd–odd 126I have been studied via the heavy–ion induced fusion–evaporation reaction 122Sn(11B,5n2p) at beam energies of 55 and 60 MeV with beams provided by the HI–13 tandem accelerator of CIAE in Beijing.A level scheme consisting of 20 new γ transitions assigned to 126I is established.The assignment of the established level scheme to 126I is based on the observed coincidences between the newly identified γ–transitions and two previously known cascade γ transitions feeding the ground state of 126I, and supported by a cross measurement using the 124Sn(7lI,5n) reaction performed at UTTAC,Japan.The observed structures of 126I at high spins show typical properties of collective rotation in a deformed nucleus. their possible configurations are discussed briefly on the basis of knowledge from the neighboring nuclei. 相似文献
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ZHANG Yu-Hu 《中国物理C(英文版)》2002,26(6):582-588
High spin states in deformed odd-odd 180Ir have been investigated using the 154Sm (31P, 5nγ)180Ir reaction through the measurements of excitation functions at 150, 155, 160, 165 and 170 MeV beam energies, K X-γ and γ-γ coincidences at 160 MeV. A new level scheme composed of 5 rotational bands has been established. According to the band structure characteristics and the deduced in band B(M1)/B(E2) ratios, the quasiparticle configurations and spin and parity have been proposed to the observed bands. The neutron AB crossing is observed at hωc≈0.26 MeV for the π1/2-[541]⊙ν1/2-[521] and π1/2-[541]⊙ν5/2-[512] bands. This AB crossing frequency is close to that in the ν5/2-[512] band of 179Os indicating the loss of intruder nature of the π1/2 - orbit. Gradual alignment gain in both the π9/2-[514]⊙ν7/2+[633] and π9/2-ν5/2-[512] bands is observed which is similar to the low spin anomaly in alignment in the πh11/2,πd5/2 and πi13/2 bands of neighboring Ir and Re isotopes. Different alignment properties have been discussed in the framework of cranked shell model, and a larger quadrupole deformation is suggested for the bands with π9/2-[514] orbit involved. 相似文献
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利用重离子熔合蒸发反应149Sm(27Al,4nγ)172Re布居了形变双奇核172Re的高自旋态,用12套带有BGO反康普顿抑制的高纯锗探测器阵列进行了在束γ实验测量,首次建立了形变双奇核172Re由3个转动带构成的高自旋态能级纲图.研究和讨论了3个转动带的结构特征,基于已有的高自旋态核结构知识并通过系统学比较和分析指出它们的准粒子组态分别为πh11/2⊙νi13/2,πh9/2⊙νi13/2和π1/2-[541]⊙ν1/2-[521].发现前两个转动带在自旋小于18.5h时其转动能级呈现反常的旋称劈裂. 相似文献
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用能量为80MeV的19F束通过反应76Ge(19F,5n)90Nb布居了90Nb的高自旋态.通过在束γ测量分析90Nb退激γ射线的符合级联关系,发现了19条新的属于90Nb的γ跃迁,建立了90Nb的高自旋态能级纲图.通过经验壳模型计算指定了部分能级的组态,并结合实验DCO比值和与相邻N=49核素的系统比较,确认了新能级的自旋和宇称. The high spin states of~(90)Nb have been populated via reaction~(76)Ge(~(19)F, 5n)~(90)Nb at beam energy of 80 MeV. The de-exciting γ-rays have been measured with in-beam γ-ray spectroscopy method. After γ-γ coincidence analysis, 19 new γ transitions were identified and assigned to~(90)Nb. The new level scheme of~(90)Nb was established. Based on the semi-empirical shell model calculations, the configurations of the levels have been suggested. In addition, the spins and parities of the new levels ... 相似文献
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Physics of Atomic Nuclei - The properties of the odd-odd 130In nucleus, which neighbors the doubly magic neutron-rich 132Sn nucleus, are calculated in the random-phase approximation. Detailed... 相似文献
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Ma Yingjun Zhao Guangyi Wang Zhe Zheng Hua Liu Yunzuo Zhou Shangui Wu Xiaoguang Yang Chunxiang 《中国物理C(英文版)》1997,21(11):970-975
Both yrast and 4-quasiparticle bands in 162Lu are established by using in-beam spectroscopy. It is shown that within the framework of cranking shell model,positive deformation can also lead to the low-spin signature inversion in the yrast band in Z=71 odd-odd 162Lu nucleus. 相似文献
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通过熔合蒸发反应^129Te(^19F,4nγ)布居了^143Pm的高自旋态,利用在束γ谱学方法,对^143Pm的高自旋态核结构进行了研究,测量了γ射线单谱和γ-γ符合谱,并进行了γ射线各向异性以及DCO比率分析,建立了激发高能达10535.4keV的能级纲图,其中包括新发现的32条γ射线和17个新能级,用弱耦合模型对^143Pm的晕态能级结构进行了解释。 相似文献
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The beta decay of the 2+ 92m Nb was reinvestigated via93Nb(γ, n) reaction. The feeding of the 2+ 2,067 keV level of92Zr was determined measuring the intensity of the 1,132 keV gamma-ray transition. 相似文献
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ZHENG Yong ZHOU Xiao-Hong ZHANG Yu-Hu LIU Zhong PAN Qiang-Yan GAN Zai-Guo 《中国物理C(英文版)》2002,26(4):359-363
High-spin states of 143Tb have been studied via the 118Sn(32S,1p4n)145Tb reaction by means of in-beam γ-ray spectroscopy. Measurements of γ-ray excitation functions and γ-γ-t coincidences were performed with 12 BGO(AC)HPGe detectors. A level scheme for 145Tb including 41 γ-rays which come from the deexcitations of the 24 levels, has been established for the first time based on an analysis of the γ-ray excitation functions, γ-γ coincidence relationships, intensity balances and cross-over transitions. The spins for most of the levels in the scheme are assigned according to the results of the measured γ-ray anisotropies. Considering the structure similarity between 143Eu and 145Tb, the low-lying levels in 145Tb are interpreted by coupling a h9/2 proton to the excited states in 144Gd core. 相似文献
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肖树冬 朱胜江 杨利明 J.H.Hamilton A.V.Ramayya J.K.Hwang 张征 姜卓 车兴来 禹英男 I.Y.Lee J.O.Rasmussen W.C.Ma 《中国物理 C》2004,28(1):37-41
通过对252Cf自发裂变产生的瞬发γ射线的多重符合测量,对丰中子核116,118,120Cd的高自旋态进行了研究.实验是利用美国罗仑兹伯克利实验室的超级γ球探测装置进行的.118Cd的晕带自旋扩展到18h,而116,120Cd的晕带扩展到16h.利用推转壳模型对带结构进行了计算,对这几个核晕带很陡的回弯现象做了讨论.在每个核中观测到了5-和7-能级,对其特性进行了讨论.在118Cd中还观测到一个基于7-能级的准转动带 相似文献