Testing isospin symmetry breaking in ab initio nuclear theory

Martin, Matthew S.; Stroberg, S. R.; Holt, J. D.; Leach, K. G.

doi:10.1103/physrevc.104.014324

Title: Testing isospin symmetry breaking in ab initio nuclear theory

Journal Article · 30 July 2021 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.104.014324 · OSTI ID:1812290

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TRIUMF, Vancouver, BC (Canada); Colorado School of Mines, Golden, CO (United States); Simon Fraser Univ., Burnaby, BC (Canada); Colorado School of Mines
Univ. of Washington, Seattle, WA (United States)
TRIUMF, Vancouver, BC (Canada); McGill Univ., Montreal, QC (Canada)
Colorado School of Mines, Golden, CO (United States)

In this work we present the first steps towards benchmarking isospin symmetry breaking in ab initio nuclear theory for calculations of superallowed Fermi β decay. Using the valence-space in-medium similarity renormalization group, we calculate b and c coefficients of the isobaric multiplet mass equation, starting from two different Hamiltonians constructed from chiral effective field theory. We compare results to experimental measurements for all T = 1 isobaric analog triplets of relevance to superallowed β decay for masses A = 10 to A = 74 and find an overall agreement within approximately 250 keV of experimental data for both b and c coefficients. A greater level of accuracy, however, is obtained by a phenomenological Skyrme interaction or a classical charged-sphere estimate. Lastly, we show that evolution of the valence-space operator does not meaningfully improve the quality of the coefficients with respect to experimental data, which indicates that higher-order many-body effects are likely not responsible for the observed discrepancies.

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Research Organization:: Colorado School of Mines, Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0017649; FG02-97ER41014; FG02-93ER40789

OSTI ID:: 1812290

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 104; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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