Mass Measurement of Upper fp-Shell N = Z − 2 and N = Z − 1 Nuclei and the 
Importance of Three-Nucleon Force along the N = Z Line

Wang, M.; Zhang, Y. H.; Zhou, X.; Zhou, X. H.; Xu, H. S.; Liu, M. L.; Li, J. G.; Niu, Y. F.; Huang, W. J.; Yuan, Q.; Zhang, S.; Xu, F. R.; Litvinov, Yu. A.; Blaum, K.; Meisel, Z.; Casten, R. F.; Cakirli, R. B.; Chen, R. J.; Deng, H. Y.; Fu, C. Y.; Ge, W. W.; Li, H. F.; Liao, T.; Litvinov, S. A.; Shuai, P.; Shi, J. Y.; Song, Y. N.; Sun, M. Z.; Wang, Q.; Xing, Y. M.; Xu, X.; Yan, X. L.; Yang, J. C.; Yuan, Y. J.; Zeng, Q.; Zhang, M.

doi:10.1103/PhysRevLett.130.192501

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Mass Measurement of Upper fp-Shell N = Z − 2 and N = Z − 1 Nuclei and the Importance of Three-Nucleon Force along the N = Z Line

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

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Citation

Wang, M., Zhang, Y., Zhou, X., Zhou, X., Xu, H., Liu, M., et al. (2023). Mass Measurement of Upper fp-Shell N = Z − 2 and N = Z − 1 Nuclei and the Importance of Three-Nucleon Force along the N = Z Line. Physical Review Letters, 130(19): 192501. doi:10.1103/PhysRevLett.130.192501.

Cite as: https://hdl.handle.net/21.11116/0000-000D-1B94-E

Abstract

Using a novel method of isochronous mass spectrometry, the masses of ⁶²Ge, ⁶⁴As, ⁶⁶Se, and ⁷⁰Kr are measured for the first time, and the masses of ⁵⁸Zn, ⁶¹Ga, ⁶³Ge, ⁶⁵As, ⁶⁷Se, ⁷¹Kr, and ⁷⁵Sr are redetermined with improved accuracy. The new masses allow us to derive residual proton-neutron interactions (δV_pn) in the N=Z nuclei, which are found to decrease (increase) with increasing mass A for even-even (odd-odd) nuclei beyond Z=28. This bifurcation of δV_pn cannot be reproduced by the available mass models, nor is it consistent with expectations of a pseudo-SU(4) symmetry restoration in the fp shell. We performed ab initio calculations with a chiral three-nucleon force (3NF) included, which indicate the enhancement of the T=1 pn pairing over the T=0 pn pairing in this mass region, leading to the opposite evolving trends of δV_pn in even-even and odd-odd nuclei.