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.

arXiv comment5 pages, 3 figures, submitted to PRL

References in corpus (16)

• Modern Theory of Nuclear Forces
• The Shell Model as Unified View of Nuclear Structure
• Three-body forces and the limit of oxygen isotopes
• From low-momentum interactions to nuclear structure
• Shell model study of the isobaric chains A=50, A=51 and A=52
• Constraints on neutron star radii based on chiral effective field theory interactions
• Effective interaction for pf-shell nuclei
• First Penning-trap mass measurement in the millisecond half-life range: the exotic halo nucleus 11Li
• Three-body forces and shell structure in calcium isotopes
• First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He
• TITAN's Digital RFQ Ion Beam Cooler and Buncher, Operation and Performance
• First Use of High Charge States for Mass Measurements of Short-lived Nuclides in a Penning Trap
• Verifying the accuracy of the TITAN Penning-trap mass spectrometer
• Nuclear correlations and the r-process
• Penning-Trap Mass Measurements of the Neutron-Rich K and Ca Isotopes: Resurgence of the N = 28 Shell Strength
• Chiral three-nucleon forces and pairing in nuclei

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