Masses of neutron-rich 52–54Sc and 54,56Ti nuclides: The N=32 subshell closure 
in scandium

Xu, X.; Wang, M.; Blaum, Klaus; Holt, J. D.; Litvinov, Yu. A.; Schwenk, Achim; Simonis, J.; Stroberg, S. R.; Zhang, Y. H.; Xu, H. S.; Shuai, P.; Tu, X. L.; Zhou, X. H.; Xu, F. R.; Audi, G.; Chen, R. J.; Chen, X. C.; Fu, C. Y.; Ge, Z.; Huang, Wenjia; Litvinov, S.; Liu, D. W.; Lam, Y. H.; Ma, X. W.; Mao, R. S.; Ozawa, A.; Sun, B. H.; Sun, Y.; Uesaka, T.; Xiao, G. Q.; Xing, Y. M.; Yamaguchi, T.; Yamaguchi, Y.; Yan, X. L.; Zeng, Q.; Zhao, H. W.; Zhao, T. C.; Zhang, W.; Zhan, W. L.

doi:10.1103/PhysRevC.99.064303

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Masses of neutron-rich ^52–54Sc and ^54,56Ti nuclides: The N=32 subshell closure in scandium

MPS-Authors

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Blaum, Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Schwenk, Achim
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Huang, Wenjia
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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引用

Xu, X., Wang, M., Blaum, K., Holt, J. D., Litvinov, Y. A., Schwenk, A., Simonis, J., Stroberg, S. R., Zhang, Y. H., Xu, H. S., Shuai, P., Tu, X. L., Zhou, X. H., Xu, F. R., Audi, G., Chen, R. J., Chen, X. C., Fu, C. Y., Ge, Z., Huang, W., Litvinov, S., Liu, D. W., Lam, Y. H., Ma, X. W., Mao, R. S., Ozawa, A., Sun, B. H., Sun, Y., Uesaka, T., Xiao, G. Q., Xing, Y. M., Yamaguchi, T., Yamaguchi, Y., Yan, X. L., Zeng, Q., Zhao, H. W., Zhao, T. C., Zhang, W., & Zhan, W. L. (2019). Masses of neutron-rich ^52–54Sc and ^54,56Ti nuclides: The N=32 subshell closure in scandium. Physical Review C, 99(6):. doi:10.1103/PhysRevC.99.064303.

引用: https://hdl.handle.net/21.11116/0000-0004-4682-A

要旨

Isochronous mass spectrometry has been applied in the storage ring CSRe to measure the masses of the neutron-rich ^52–54Sc and ^54,56Ti nuclei. The new mass excess values ME(⁵²Sc)=−40525(65) keV, ME(⁵³Sc)=−38910(80) keV, and ME(⁵⁴Sc)=−34485(360) keV, deviate from the Atomic Mass Evaluation 2012 by 2.3σ, 2.8σ, and 1.7σ, respectively. These large deviations significantly change the systematics of the two-neutron separation energies of scandium isotopes. The empirical shell gap extracted from our new experimental results shows a significant subshell closure at N=32 in scandium, with a similar magnitude as in calcium. Moreover, we present ab initio calculations using the valence-space in-medium similarity renormalization group based on two- and three-nucleon interactions from chiral effective field theory. The theoretical results confirm the existence of a substantial N=32 shell gap in Sc and Ca with a decreasing trend towards lighter isotones, thus providing a consistent picture of the evolution of the N=32 magic number from the pf into the sd shell.