Lifetime measurements of 0+ states in Er168 with the Doppler-shift attenuation method
Lifetime measurements of 0+ states in Er168 with the Doppler-shift attenuation method
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使用多普勒频移衰减法测量 Er168 中 0 态的寿命
DOI：
10.1103/physrevc.106.044302
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发表时间：
2022
影响因子：
3.1
通讯作者：
Mukhopadhyay, S.
中科院分区：
文献类型：
--
作者：
Lesher, S. R.;Aprahamian, A.;Lee, K.;Alemayehu, B.;Clark, L. M.;James, X.;Lowrie, J. C.;Meier, M.;McEwan, L.;Mukhopadhyay, S.
背景：变形核的最低形状振荡本质上被描述为四极，导致两种类型的振动或振荡：沿对称轴振荡的振动和在对称轴上投影破坏轴对称的振动。振动似乎被很好地表征为变形核中的第一（或）带，并在整个区域表现出系统行为。然而，人们对激发的性质仍然知之甚少，并且几十年来一直存在争议。目的：这项工作的目标是通过测量这些状态的寿命来了解所观察到的状态的性质，并确定它们是否与建立在变形基态、其他共存形状的最小值、单粒子态或混合效应上的振荡一致。方法：用多普勒频移衰减测量原子核中激发态的寿命方法（DSAM）和非弹性中子散射反应，在肯塔基大学加速器实验室。结果：通过（）反应观察到了许多状态[D.布库雷斯库，物理学家。 Rev. C 73, 064309 (2006)0556-281310.1103/PhysRevC.73.064309.]。我们确认了 1217.2、1421.5、1833.6、2364.9、2392.1 和 2643.0 keV 的状态。但是，我们不能支持之前指定的 2114.1、2200.6、2572.5 和 2617.4 keV 的能级。我们报告了六个已确认的激发和其他能带成员的测量寿命。结论：结果表明，第三个激发激发承载着集体强度，因此有可能成为基态振荡。该结果与 的情况类似，也是表现出比第一激发带更大的集体性的状态。 Delarocheet al.[J.-P Delaroche，物理学。 Rev. C 81, 014303 (2010)0556-281310.1103/PhysRevC.81.014303.]集体能带的预测为at，其对应于第三激发能带。
Background:The lowest-lying shape oscillations of deformed nuclei have been described as quadrupole in nature, resulting in two types of vibrations or oscillations:vibrations with oscillations along the symmetry axisandvibrations breaking axial symmetry with a projection ofon the symmetry axis. Thevibration seems to be well characterized as the first(or) band in deformed nuclei and exhibits a systematic behavior across the region. The nature of theexcitations, however, has remained poorly understood and has been open to debate for some decades.Purpose:The goal of this work is to understand the nature ofstates observed inthrough measurements of the lifetimes of these states and to determine if they are consistent with oscillations built on a deformed ground state, the minima of other coexisting shapes, single-particle states, or a mixture of effects.Method:Lifetimes of excited states in thenucleus were measured with the Doppler shift attenuation method (DSAM) and the inelastic neutron scattering reaction,, at the University of Kentucky Accelerator Laboratory.Results:Numerousstates had been observed by the () reaction [D. Bucurescu , Phys. Rev. C 73, 064309 (2006)0556-281310.1103/PhysRevC.73.064309.]. We confirm thestates at 1217.2, 1421.5, 1833.6, 2364.9, 2392.1, and 2643.0 keV in. We could not, however, support the previous assignments oflevels at 2114.1, 2200.6, 2572.5, and 2617.4 keV. We report measured lifetimes for six confirmedexcitations and additional members ofbands.Conclusions:The results forshow that it is the third excitedexcitation that carries the collective strength and, therefore, the potential to be an oscillation on the ground state. This result is similar to the case in, where it was also thestate that exhibited greater collectivity than the first excitedband. The Delarocheet al.[J.-P Delaroche , Phys. Rev. C 81, 014303 (2010)0556-281310.1103/PhysRevC.81.014303.] prediction for a collectiveband is at, which corresponds the third excitedband.