^(76)Se三声子态成员的候选者

Newly Discovered Candidate of the Member of Three-Phonon Multiplet in ^(76)Se

通过^(76)Br(T_(1/2)=16．2h)β+/EC衰变方法得到^(76)Br衰变纲图,并确认了Müller等通过核反应^(76)Se(p,p′)方法发现^(76)Se能级纲图中1791．31keV能级．不过,Müller等当时并没有指出该条能级的自旋和宇称,以及应该属于哪一个声子态的成员．经过分析我们认为1791．31keV能级可以作为^(76)Se三声子态的一个候选成员．此外,为了研究这个介于强形变和球形核之间的过渡区核的形变,对它的正宇称态进行了采用推转壳模型形式的总转动能面计算．

The decay scheme of ^76Br is obtained by the ^76Br （T1/2=16.2h） β^＋/EC approach. And the 1791.31keV level, which was identified firstly by Miiller et al by the ^76Se （p, p＇） approach several years ago, is reconfirmed. However, Miiller et al did not point out the spin and parity of this level, and which phonon multiplet it should be belong to. Now we consider the assertion that this level is assigned as a new candidate of the three-phonon multiplet in ^76Se is reasonable. In addition, for researching deformation of ^76Se which lies in the transitional region of strong deformed and spherical nuclei, we calculate the total Routhian surfaces （TRS） of positive-parity states by cranking shell model formalism.