On the nature of “three-phonon” excitations in 112Cd
On the nature of “three-phonon” excitations in 112Cd
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DOI：
10.1016/0370-2693(96)01038-6
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发表时间：
1996-10
影响因子：
4.4
通讯作者：
H. Lehmann;P. Garrett;J. Jolie;C. Mcgrath;M. Yeh;S. Yates
中科院分区：
文献类型：
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作者：
H. Lehmann;P. Garrett;J. Jolie;C. Mcgrath;M. Yeh;S. Yates
用多普勒频移衰减法(DSAM)测量了(n，n‘γ)反应后112Cd中3声子态的寿命。实验结果允许确定相关的B(E_2)值，并与不同的理论描述进行了比较。对于3-声子五重态的3+和4+成员，观察到有利于解释声子模型中集体性的集体增强。然而，对于所提出的2+成员，这个简单的模型很可能是由于入侵态、混合对称态和声子态之间微妙的相互作用而失败的，并且衰变模式被强烈扰动。用IBM-2计算得到了最好的总体一致性。
The lifetimes of proposed 3-phonon states in112Cd have been measured using the Doppler shift attenuation method (DSAM) following the (n,n′γ) reaction. The experimental results allow the determination of relevant B(E2) values which are compared to different theoretical descriptions. Collective enhancements favouring the interpretation of collectivity in the phonon model are observed for 3+and 4+members of the 3-phonon quintuplet. However, for the proposed 2+member, this simple model fails most likely due to the subtle interplay between intruder, mixed-symmetry, and phonon states, and the decay pattern is strongly perturbed. The best overall agreement is obtained with IBM-2 calculations.