28 S中受阻质子集体性：Z=16时可能的幻数
Hindered proton collectivity in 28S: Possible magic number at Z=16
摘要：
在库仑激发下，用53 MeV/核子的能量，实验上得到了28 S的约化跃迁几率B（E2;0 ->2+）.所得B（E2）值181（31）e2 fm 4小于基于经验B（E2）系统学的预期。双重比率|M_n/M_p|由已知的镜像核28 Mg的B（E2）值计算出M_n值，确定了28 S中0 ~+ ->2 ~+跃迁的N/Z为1.9（2），表明质子集体性相对于中子集体性是有阻碍的。这些结果表明，幻数Z=16出现在|T_z| =2的核28 S中。
英文摘要：
The reduced transition probability B(E2;0 ->2+) for 28S was obtained experimentally using Coulomb excitation at 53 MeV/nucleon. The resultant B(E2) value 181(31) e2fm4 is smaller than the expectation based on empirical B(E2) systematics. The double ratio |M_n/M_p|/(N/Z) of the 0+ ->2+ transition in 28S was determined to be 1.9(2) by evaluating the M_n value from the known B(E2) value of the mirror nucleus 28Mg, showing the hindrance of proton collectivity relative to that of neutrons. These results indicate the emergence of the magic number Z=16 in the |T_z|=2 nucleus 28S.
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