Improved Nuclear Physics Near $A=61$ Refines Urca Neutrino Luminosities in Accreted Neutron Star Crusts

Abstract

We performed a Penning trap mass measurement of ${}^{61}\mathrm{Zn}$ at the National Superconducting Cyclotron Laboratory and NuShellX calculations of the ${}^{61}\mathrm{Zn}$ and ${}^{62}\mathrm{Ga}$ structure using the GXPF1A Hamiltonian to obtain improved estimates of the ${}^{61}\mathrm{Zn}(p,\gamma {)}^{62}\mathrm{Ga}$ and ${}^{60}\mathrm{Cu}(p,\gamma {)}^{61}\mathrm{Zn}$ 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 ${}^{61}\mathrm{V}$ and ${}^{61}\mathrm{Cr}$ 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.

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References in corpus (36)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Astrophysical Reaction Rates From Statistical Model Calculations
• New effective interaction for $pf$-shell nuclei and its implications for the stability of the $N$=$Z$=28 closed core
• Models for Type I X-Ray Bursts with Improved Nuclear Physics
• The rp Process Ashes from Stable Nuclear Burning on an Accreting Neutron Star
• Dependence of X-Ray Burst Models on Nuclear Reaction Rates
• The Effects of Variations in Nuclear Processes on Type I X-Ray Burst Nucleosynthesis
• Strong neutrino cooling by cycles of electron capture and ${\beta }^{-}$ decay in neutron star crusts
• Impact of the symmetry energy on the outer crust of non-accreting neutron stars
• Thermonuclear X-ray bursts
• Possible Resonances in the 12C + 12C Fusion Rate and Superburst Ignition
• Nuclear Physics of the Outer Layers of Accreting Neutron Stars
• Cooling of Accretion-Heated Neutron Stars
• Forecasting neutron star temperatures: predictability and variability
• A strong shallow heat source in the accreting neutron star MAXI J0556-332
• Nuclear Reactions in the Crusts of Accreting Neutron Stars
• Constraints on neutron star mass and radius in GS 1826-24 from sub-Eddington X-ray bursts
• Dependence of X-ray Burst Models on Nuclear Masses
• Influence of Nuclear Reaction Rate Uncertainties on Neutron Star Properties Extracted From X-ray Burst Model-Observation Comparisons
• Precision Mass Measurement of ${}^{58-63}$Cr: Nuclear Collectivity towards the \emph{N}=40 Island of Inversion
• Consistent Modeling of GS 1826-24 X-ray Bursts for Multiple Accretion Rates Demonstrates the Possibility to Constrain rp-process Reaction Rates
• Late time cooling of neutron star transients and the physics of the inner crust
• Thermonuclear Bursts with Short Recurrence Times from Neutron Stars Explained by Opacity-Driven Convection
• Urca cooling pairs in the neutron star ocean and their effect on superbursts
• Nuclear Mass Measurements Map the Structure of Atomic Nuclei and Accreting Neutron Stars
• The thermal state of KS 1731-260 after 14.5 years in quiescence
• Multi-epoch X-ray burst modelling: MCMC with large grids of 1D simulations
• Uncertainties in $\nu$p-process nucleosynthesis from Monte Carlo variation of reaction rates
• Different accretion heating of the neutron star crust during multiple outbursts in MAXI J0556-332
• Constraints on Bygone Nucleosynthesis of Accreting Neutron Stars
• First direct determination of the superallowed $\beta$-decay $Q_{EC}$-value for ${}^{14}$O
• $\beta$-decay of ${}^{61}$V and its Role in Cooling Accreted Neutron Star Crusts
• Neutron transfer reactions in accreting neutron stars
• The Impact of Neutron Transfer Reactions on Heating and Cooling of Accreted Neutron Star Crusts

Cited by in corpus (3)

• Impacts of the direct URCA and Superfluidity inside a Neutron Star on Type-I X-Ray Bursts and X-Ray Superbursts
• Constraining Accreted Neutron Star Crust Shallow Heating with the Inferred Depth of Carbon Ignition in X-ray Superbursts
• Nuclear astrophysics