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23 April 2024

» arxiv » 1603.7614

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Time-of-flight mass measurements of neutron-rich chromium isotopes up to N = 40 and implications for the accreted neutron star crust
Z. Meisel ; S. George ; S. Ahn ; D. Bazin ; B.A. Brown ; J. Browne ; J.F. Carpino ; H. Chung ; R.H. Cyburt ; A. Estradé ; M. Famiano ; A. Gade ; C. Langer ; M. Matoš ; W. Mittig ; F. Montes ; D.J. Morrissey ; J. Pereira ; H. Schatz ; J. Schatz ; M. Scott ; D. Shapira ; K. Sieja ; K. Smith ; J. Stevens ; W. Tan ; O. Tarasov ; S. Towers ; K. Wimmer ; J.R. Winkelbauer ; J. Yurkon ; R.G.T. Zegers ;
Date:	24 Mar 2016
Abstract:	We present the mass excesses of 59-64Cr, obtained from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. The mass of 64Cr is determined for the first time, with an atomic mass excess of -33.48(44) MeV. We find a significantly different two-neutron separation energy S2n trend for neutron-rich isotopes of chromium, removing the previously observed enhancement in binding at N=38. Additionally, we extend the S2n trend for chromium to N=40, revealing behavior consistent with the previously identified island of inversion in this region. We compare our results to state-of-the-art shell-model calculations performed with a modified Lenzi-Nowacki-Poves-Sieja interaction in the fp shell, including the g9/2 and d5/2 orbits for the neutron valence space. We employ our result for the mass of 64Cr in accreted neutron star crust network calculations and find a reduction in the strength and depth of electron-capture heating from the A=64 isobaric chain, resulting in a cooler than expected accreted neutron star crust. This reduced heating is found to be due to the >1-MeV reduction in binding for 64Cr with respect to values from commonly used global mass models.
Source:	arXiv, 1603.7614
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