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Abstract |
The half-lives of 24 isotopes ranging from sulfur to potassium were measured using the ZeroDegree Advanced Decay Station at the Radioactive Isotope Beam Factory, including six of the most neutron-rich -47S, 48;49Cl, 51;52Ar, 55K-for the first time, while the precision for 48Ar and 53;54K was significantly improved. Two prominent features are found: First, a half-life drop at 54K35 relative to 52;53K, supporting the persistence of the N = 34 subshell closure in potassium with Z = 19. Second, a high /3-decay rate for 48Cl31 compared to 47Cl and 49Cl, which can be explained by the critical role of the nu 1p1=2 orbital in shell-model calculations. The present calculations indicate that the N = 32 subshell gap in chlorine with Z = 17 is slightly smaller than that in calcium (Z = 20), and the significant excitation across the N = 32 subshell in 48Cl31 is mainly due to strong configuration mixing. |
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Address |
[Zeng, Q. B.; Liu, Z.; Ma, X.; Yap, J. M.; Zeng, F. F.] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China, Email: zengquanbo@impcas.ac.cn; |
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