Measurement of the sign of the spectroscopic quadrupole moment for the 2(1)+ state in 70Se: no evidence for oblate shape.
Measurement of the sign of the spectroscopic quadrupole moment for the 2(1)+ state in 70Se: no evidence for oblate shape.
复制标题
70Se 中 2(1) 态光谱四极矩符号的测量：没有扁圆形状的证据。
DOI：
10.1103/physrevlett.98.072501
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发表时间：
2007
影响因子：
8.6
通讯作者：
Hurst AM
中科院分区：
文献类型：
--
作者：
Hurst AM
使用的方法，分子和原子离子被独立地选择，等压纯束ofions后加速到206 MeV的能量使用REX-ISOLDE。通过在高度分段的MINIBALL射线谱仪中记录与硅探测器中的散射粒子重合的去激发射线，推导出束流和靶核中状态的库仑激发产额。在这些能量下，库仑激发产率的第一状态，预计将是强烈敏感的光谱四极矩通过核重取向效应的迹象。实验证据在这里提出的第一状态的扁长形，重新打开的问题是否有，如前所述，变形扁圆形接近基态的轻硒同位素。
Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam ofions was postaccelerated to an energy of 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the beam and target nuclei were deduced by recording deexcitationrays in the highly segmented MINIBALL-ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the firststate is expected to be strongly sensitive to the sign of the spectroscopic quadrupole moment through the nuclear reorientation effect. Experimental evidence is presented here for a prolate shape for the firststate in, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes.