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New precision mass measurements of neutron-rich calcium and potassium isotopes and three-nucleon forces

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.
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http://hal.in2p3.fr/in2p3-00686713
Contributor : Michel Lion <>
Submitted on : Wednesday, April 11, 2012 - 10:03:01 AM
Last modification on : Thursday, February 1, 2018 - 1:26:47 AM

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A. T. Gallant, J.C. Bale, T. Brunner, U. Chowdhury, S. Ettenauer, et al.. New precision mass measurements of neutron-rich calcium and potassium isotopes and three-nucleon forces. Physical Review Letters, American Physical Society, 2012, 109, pp.032506. ⟨10.1103/PhysRevLett.109.032506⟩. ⟨in2p3-00686713⟩

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