One-phonon octupole vibrational states in 136Xe, 137Cs, 138Ba, 140Ce and 142Nd with N=82

被引:3
|
作者
Hwang, J. K. [1 ]
Hamilton, J. H. [1 ]
Ramayya, A. V. [1 ]
机构
[1] Vanderbilt Univ, Dept Phys, Nashville, TN 37235 USA
来源
EUROPEAN PHYSICAL JOURNAL A | 2013年 / 49卷 / 10期
关键词
N = 82; SHELL-MODEL; EXCITATIONS; NUCLEI; GD-148;
D O I
10.1140/epja/i2013-13125-5
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Excited high spin states in Xe-136, Cs-137, Ba-138, Ce-140 and Nd-142 with N = 82 are reorganized and interpreted in terms of the weak coupling mode of an octupole 3 phonon. Nearly identical sequences of levels with Delta I = 3 and Delta pi = yes built on 17/2(+) and 23/2(-) states are found, for the first time, up to 29/2(+) and 35/2(-), respectively, for 22 states of Cs-137. Also, nearly identical sequences of levels with Delta I = 3 and Delta pi = yes built on the 6(+) and 9(-) states are found, for the first time, up to 14(+) and 17(-), respectively, for 18 states of Xe-136, up to 14(+) and 17(-), respectively, for 24 states of Ba-138 and up to 11(+) and 14(-), respectively, for 14 states of Ce-140. New spins and parities are assigned, tentatively, to the high spin states of these nuclei based on the weak coupling mode of an octupole 3(-) phonon. The weak coupling of an octupole 3(-) phonon needs to be considered when single particle configurations are assigned to high spin states. Neutron particle-hole states (nu h(11/2)(-1)f(7/2)(+1)) with weak coupling of an octupole 3(-) phonon are proposed, for the first time. The nu h(11/2)(-1)f(7/2)(+1) excitation energies (E-ext(1p1h)) are nearly constant with increasing of Z. One-phonon excited states in Xe-136, Cs-137, Ba-138 and Ce-140 have the stretched weak coupling configurations of Delta I = 3. But one-phonon excited states in Nd-142 show the non-stretched weak coupling configurations of an octupole phonon with Delta I = 3 and 2.
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页码:1 / 8
页数:8
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