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Physical Review Letters 109 (2012) 102501
Mass Measurements of the Neutron-Deficient Ti-41, Cr-45, Fe-49, and Ni-53 Nuclides: First Test of the Isobaric Multiplet Mass Equation in f p-Shell Nuclei
Y.H. Zhang, H. S. Xu, Y. A. Litvinov, X.L. Tu, X. L. Yan, S. Typel, K. Blaum, M. Wang, X. H. Zhou, Y. Sun, B. A. Brown, Y. J. Yuan, J. W. Xia, J. C. Yang, G. Audi1, X. C. Chen, G. B. Jia, Z. G. Hu, X. W. Ma, R. S. Mao, B. Mei, P. Shuai, Z. Y. Sun, S. T. Wang, G. Q. Xiao, X. Xu, T. Yamaguchi, Y. Yamaguchi, Y. D. Zang, H. W. Zhao, T. C. Zhao, W. Zhang, W. L. Zhan

Isochronous mass spectrometry has been applied to neutron-deficient Ni-58 projectile fragments at the HIRFL-CSR facility in Lanzhou, China. Masses of a series of short-lived T-z = -3/2 nuclides including Ti-41, Cr-45, Fe-49, and Ni-53 have been measured with a precision of 20-40 keV. The new data enable us to test for the first time the isobaric multiplet mass equation (IMME) in f p-shell nuclei. We observe that the IMME is inconsistent with the generally accepted quadratic form for the A = 53, T = 3/2 quartet. We perform full space shell model calculations and compare them with the new experimental results.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Physique Nucléaire Expérimentale