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New level schemes with high-spin states of Tc-105,Tc-107,Tc-109

文献类型：期刊论文

作者Luo, YX; Rasmussen, JO; Hamilton, JH; Ramayya, AV; Hwang, JK; Zhu, SJ; Gore, PM; Wu, SC; Lee, IY; Fallon, P
刊名PHYSICAL REVIEW C
出版日期2004-10-01
卷号70页码:18
ISSN号0556-2813
DOI10.1103/PhysRevC.70.044310
英文摘要New level schemes of odd-Z Tc-105,Tc-107,Tc-109 are proposed based on the Cf-252 spontaneous-fission-gamma data taken with Gammasphere in 2000. Bands of levels are considerably extended and expanded to show rich spectroscopic information. Spin/parity and configuration assignments are made based on determinations of multipolarities of low-lying transitions and the level analogies to the previously reported levels, and to those of the neighboring Rh isotopes. A non-yrast negative-parity band built on the 3/2(-)[301] orbital is observed for the first time in Tc-105. A positive-parity band built on the 1/2(+)[431] intruder orbital originating from the pi(g(7/2)/d(5/2)) subshells and having a strong deformation-driving effect is observed for the first time in Tc-105, and assigned in Tc-107. A positive-parity band built on the excited 11/2(+) level, which has rather low excitation energy and predominantly decays into the 9/2(+) level of the ground state band, provides evidence of triaxiality in Tc-107,Tc-109, and probably also in Tc-105. Rotational constants are calculated and discussed for the K=1/2 intruder bands using the Bohr-Mottelson formula. Level systematics are discussed in terms of the locations of proton Fermi levels and deformations. The band crossings of yrast positive-parity bands are observed, most likely related to h(11/2) neutron alignment. Triaxial-rotor-plus-particle model calculations performed with epsilon=0.32 and gamma=-22.5degrees on the prolate side of maximum triaxiality yielded the best reproduction of the excitation energies, signature splittings, and branching ratios of the positive-parity bands (except for the intruder bands) of these Tc isotopes. The significant discrepancies between the triaxial-rotor-plus-particle model calculations and experiment for the K=1/2 intruder bands in Tc-105,Tc-107 need further theoretical studies.
WOS关键词ISOTOPES ; FISSION ; IDENTIFICATION ; QUASIPARTICLE ; BANDS
WOS研究方向Physics
语种英语
WOS记录号WOS:000225043100028
出版者AMERICAN PHYSICAL SOC
源URL[http://119.78.100.186/handle/113462/39319]  
专题中国科学院近代物理研究所
通讯作者Luo, YX
作者单位1.Vanderbilt Univ, Dept Phys, Nashville, TN 37235 USA
2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
3.Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
4.Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China
5.Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan
6.Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA
7.Joint Inst Nucl Res, Flerov Lab Nucl React, Dubna, Russia
8.Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
9.Univ Fed Rio de Janeiro, BR-68528 Rio De Janeiro, Brazil
10.Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany
推荐引用方式
GB/T 7714		 Luo, YX,Rasmussen, JO,Hamilton, JH,et al. New level schemes with high-spin states of Tc-105,Tc-107,Tc-109[J]. PHYSICAL REVIEW C,2004,70:18.
APA Luo, YX.,Rasmussen, JO.,Hamilton, JH.,Ramayya, AV.,Hwang, JK.,...&Gelberg, A.(2004).New level schemes with high-spin states of Tc-105,Tc-107,Tc-109.PHYSICAL REVIEW C,70,18.
MLA Luo, YX,et al."New level schemes with high-spin states of Tc-105,Tc-107,Tc-109".PHYSICAL REVIEW C 70(2004):18.

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来源：近代物理研究所

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