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20 April 2024

» arxiv » 1204.1987

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New precision mass measurements of neutron-rich calcium and potassium isotopes and three-nucleon forces
A.T. Gallant ; J.C. Bale ; T. Brunner ; U. Chowdhury ; S. Ettenauer ; A. Lennarz ; D. Robertson ; V.V. Simon ; A. Chaudhuri ; J.D. Holt ; A.A. Kwiatkowski ; E. Mané ; J. Menéndez ; B.E. Schultz ; M.C. Simon ; C. Andreoiu ; P. Delheij ; M.R. Pearson ; H. Savajols ; A. Schwenk ; J. Dilling ;
Date:	9 Apr 2012
Abstract:	We present precision Penning-trap mass measurements of neutron-rich calcium and potassium isotopes in the vicinity of neutron number N=32. Using the TITAN system the mass of $^{51}$K was measured for the first time, and the precision of the $^{51,52}$Ca mass values were improved significantly. The new mass values show a dramatic increase of the binding energy compared to those reported in the atomic mass evaluation. In particular, $^{52}$Ca is more bound by 1.74 MeV, and the behavior with neutron number deviates substantially from the tabulated values. An increased binding was predicted recently based on calculations that include three-nucleon (3N) forces. We present a comparison to improved calculations, which agree remarkably with the evolution of masses with neutron number, making neutron-rich calcium isotopes an exciting region to probe 3N forces at neutron-rich extremes.
Source:	arXiv, 1204.1987
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