Quasi-deuteron model at low renormalization group resolution

Tropiano, A. J.; Bogner, S. K.; Furnstahl, R. J.; Hisham, M. A.

doi:10.1103/physrevc.106.024324

Quasi-deuteron model at low renormalization group resolution

Journal Article · Fri Aug 19 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.106.024324· OSTI ID:1979899

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The Ohio State University, Columbus, OH (United States); OSTI
Michigan State University, East Lansing, MI (United States)
The Ohio State University, Columbus, OH (United States)

The quasi-deuteron model introduced by Levinger is used to explain cross sections for knocking out high-momentum protons in photoabsorption on nuclei. This is within a framework we characterize as exhibiting high renormalization group (RG) resolution. Assuming a one-body reaction operator, the nuclear wave function must include two-body short-range correlations (SRCs) with deuteronlike quantum numbers. In Phys. Rev. C 104, 034311 (2021), we showed that SRC physics can be naturally accounted for at low RG resolution. We describe the quasi-deuteron model at low RG resolution and determine the Levinger constant, which is proportional to the ratio of nuclear photoabsorption to that for photodisintegration of a deuteron. We extract the Levinger constant based on the ratio of momentum distributions at high relative momentum. We compute momentum distributions evolved under similarity RG (SRG) transformations where the SRC physics is shifted into the operator as a universal two-body term. The short-range nature of this operator motivates using local-density approximations with uncorrelated wave functions in evaluating nuclear matrix elements, which greatly simplifies the analysis. The operator must be consistently matched to the RG scale and scheme of the interaction for a reliable extraction. We apply SRG transformations to different nucleon-nucleon (NN) interactions and use the deuteron wave functions and Weinberg eigenvalues to determine approximate matching scales. We predict the Levinger constant for several NN interactions and a wide range of nuclei comparing to experimental extractions. The predictions at low RG resolution are in good agreement with experiment when starting with a hard NN interaction and the initial operator. Similar agreement is found using soft NN interactions when the additional two-body operator induced by evolution from hard to soft is included.

View Accepted Manuscript (DOE)

Research Organization:: Michigan State University, East Lansing, MI (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0018083

OSTI ID:: 1979899

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 106; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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