Mass measurements for the Tz=−2fp-shell nuclei 40Ti, 44Cr, 46Mn, 48Fe, 50Co, and
52Ni

Fu, C. Y.; Zhang, Y. H.; Wang, M.; Zhou, X. H.; Litvinov, Yu. A.; Blaum, K.; Xu, H. S.; Xu , X.; Shuai, P.; Lam, Y. H.; Chen, R. J.; Yan, X. L.; Chen, X. C.; He, J. J.; Kubono, S.; Sun, M. Z.; Tu, X. L.; Xing, Y. M.; Zeng, Q.; Zhou, X.; Zhan, W. L.; Litvinov, S.; Audi, G.; Uesaka, T.; Yamaguchi, T.; Ozawa, A.; Sun, B. H.; Sun, Y.; Xu, F. R.

doi:10.1103/PhysRevC.102.054311

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Mass measurements for the T_z=−2fp-shell nuclei ⁴⁰Ti, ⁴⁴Cr, ⁴⁶Mn, ⁴⁸Fe, ⁵⁰Co, and ⁵²Ni

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

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

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Citation

Fu, C. Y., Zhang, Y. H., Wang, M., Zhou, X. H., Litvinov, Y. A., Blaum, K., et al. (2020). Mass measurements for the T_z=−2fp-shell nuclei ⁴⁰Ti, ⁴⁴Cr, ⁴⁶Mn, ⁴⁸Fe, ⁵⁰Co, and ⁵²Ni. Physical Review C, 102(5): 054311. doi:10.1103/PhysRevC.102.054311.

Cite as: https://hdl.handle.net/21.11116/0000-0007-5C35-7

Abstract

By using isochronous mass spectrometry at the experimental cooler storage ring in Lanzhou, China, masses of short-lived ⁴⁴Cr, ⁴⁶Mn, ⁴⁸Fe, ⁵⁰Co, and ⁵²Ni were measured for the first time and the precision of the mass of ⁴⁰Ti was improved by a factor of about 2. Relative precisions of δm/m=(1–2)×10⁻⁶ have been achieved. Details of the measurements and data analysis are given. The obtained masses are compared with the Atomic-Mass Evaluation 2016 and with theoretical model predictions. The new mass data enable us to extract the higher-order coefficients, d and e, of the quartic form of the isobaric multiplet mass equation for the fp-shell isospin quintets. Unexpectedly large d and e values for the A=44 quintet are found. By revisiting the previous experimental data on β-delayed protons from ⁴⁴Cr decay, it is suggested that the observed anomaly could be due to the misidentification of the T=2, J^π=0⁺ isobaric analog state in ⁴⁴V.