Improved nuclear physics near A=61 refines urca neutrino luminosities in accreted neutron star crusts - INSPIRE

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Improved nuclear physics near A=61 refines urca neutrino luminosities in accreted neutron star crusts

Oct 27, 2021

7 pages

Published in:

Phys.Rev.C 105 (2022) 2, 025804

Published: Feb 18, 2022

e-Print:

2110.14558 [nucl-ex]

DOI:

10.1103/PhysRevC.105.025804 (publication)

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Abstract: (APS)

We performed Penning trap mass measurements for

{}^{61}{Zn}

at the National Superconducting Cyclotron Laboratory and NuShellX calculations of the

{}^{61}{Zn}

and

{}^{62}{Ga}

structure using the GXPF1A Hamiltonian to obtain improved estimates of the

{}^{61}{Zn} (p, γ) {}^{62}{Ga}

and

{}^{60}{Cu} (p, γ) {}^{61}{Zn}

reaction rates. Surveying astrophysical conditions for type-I x-ray bursts with the code mesa, implementing our improved reaction rates, and taking into account updated nuclear masses for

{}^{61}V

and

{}^{61}{Cr}

from the recent literature, we refine the neutrino luminosity from the important mass number

A = 61

urca cooling source in accreted neutron-star crusts. This improves our understanding of the thermal barrier between deep heating in the crust and the shallow depths where extra heat is needed to explain x-ray superbursts, as well as the expected signature of crust urca neutrino emission in light curves of cooling transients.

Note:

Submitted

References(70)

Figures(3)

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