Shape trends and triaxiality in neutron-rich odd-mass Y and Nb isotopes

doi:10.1088/0954-3899/31/11/013

	Shape trends and triaxiality in neutron-rich odd-mass Y and Nb isotopes
	Luo, YX ; Rasmussen, JO ; Stefanescu, I ; Gelberg, A ; Hamilton, JH ; Ramayya, AV ; Hwang, JK ; Zhu, SJ ; Gore, PM ; Fong, D
刊名	JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
	2005-11-01
卷号	31 页码:1303-1327
ISSN号	0954-3899
DOI	10.1088/0954-3899/31/11/013
英文摘要	New level schemes of odd-Z Y-99,Y-101 (Z = 39) and Nb-101,Nb-105 (Z = 41) are established based on the measurement of prompt gamma rays from the fission of Cf-252 at Gammasphere. Bands of pi 5/2(+)[422], pi 5/2(-)[303] and pi 3/2(-)[301] are observed and extended to provide spectroscopic information concerning nuclear shapes in this important odd-Z region. In combination with the level structure of the odd-Z Tc (Z = 43), Rh (Z = 45) and the neighbouring even-Z isotopes the level systematics, signature splittings and kinematic and dynamic moments of inertia of the bands in the Y and Nb isotopes are discussed in terms of shape transition and triaxiality. The pronounced difference observed in the signature splittings between Y and Tc, Rh isotopes is interpreted as evidence of the axially symmetric deformed shape in the Y isotopes, and, as previously reported, large and near maximum triaxiality in Tc-Rh isotopes. The likely lowering of crossing frequencies of the ground-state bands in Tc and Rh isotones in comparison with those in Y isotones also implies a shape transition from axially symmetric deformed shapes in Y nuclei to triaxiality in Tc and Rh isotones. Triaxial-rotor-plus-particle model calculations strongly support a pure axially symmetric shape with large quadrupole deformation in Y isotopes. The model calculations yielded gamma values ranging from -19 degrees to -13 degrees for the 5/2(+)[422] ground-state bands of Nb-101,Nb-103,Nb-105 and of -5 degrees for the two negative-parity bands in Nb-101. The fact that Nb isotopes have intermediate values of signature splitting and band crossing frequencies between those of Y and Tc, Rh isotopes is interpreted as that the Nb isotopes are transitional nuclei with regard to triaxial deformation. A correlation of quadrupole deformations and of triaxiality is seen in the neutron-rich nuclei with Z = 39-45.
WOS关键词	HIGH-SPIN STRUCTURE ; ROTATIONAL BANDS ; NUCLEI ; STATES ; DEFORMATION ; IDENTIFICATION ; QUASIPARTICLE ; COEXISTENCE ; FISSION ; SR-98
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000233465300015
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/25703]
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.Lawrence Berkeley Lab, Berkeley, CA 94720 USA 4.Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Heverlee, Belgium 5.Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany 6.Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China 7.Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan 8.Michigan State Univ, Natl Supercond Cyclotron Lab, E Lansing, MI 48824 USA 9.Mississippi State Univ, Dept Phys, Mississippi State, MS 39762 USA 10.Joint Inst Nucl Res Dubna, Flerov Lab Nucl React, Dubna, Russia
推荐引用方式 GB/T 7714	Luo, YX,Rasmussen, JO,Stefanescu, I,et al. Shape trends and triaxiality in neutron-rich odd-mass Y and Nb isotopes[J]. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,2005,31:1303-1327.
APA	Luo, YX.,Rasmussen, JO.,Stefanescu, I.,Gelberg, A.,Hamilton, JH.,...&Donangelo, R.(2005).Shape trends and triaxiality in neutron-rich odd-mass Y and Nb isotopes.JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,31,1303-1327.
MLA	Luo, YX,et al."Shape trends and triaxiality in neutron-rich odd-mass Y and Nb isotopes".JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 31(2005):1303-1327.