Time-Reversed Particle-Vibration Loops and Nuclear Gamow-Teller Response

Robin, Caroline; Litvinova, Elena

doi:10.1103/physrevlett.123.202501

Title: Time-Reversed Particle-Vibration Loops and Nuclear Gamow-Teller Response

Journal Article · Fri Nov 15 00:00:00 EST 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.123.202501· OSTI ID:1799987

^[1]; Litvinova, Elena ^[2]

Univ. of Washington, Seattle, WA (United States); Michigan State Univ., East Lansing, MI (United States)
Western Michigan Univ., Kalamazoo MI (United States); Michigan State Univ., East Lansing, MI (United States)

The nuclear response theory for charge-exchange modes in the relativistic particle-vibration coupling approach is extended to include for the first time particle-vibration coupling effects in the ground state of the parent nucleus. In a framework based on the effective meson-nucleon Lagrangian, we investigate the role of such complex ground-state correlations in the description of Gamow-Teller transitions in ⁹⁰Zr in both (p, n) and (n, p) channels. In this work, the particle-vibration coupling effects are calculated without introducing new parameters. We find that this new correlation mechanism is fully responsible for the appearance of the strength in the n, p) branch. Comparison of our results to the available experimental data shows a very good agreement up to excitation energies beyond the giant resonance region when taking into account a phenomenological admixture of the isovector spin monopole transitions. The parent-daughter binding-energy differences are also greatly improved by the inclusion of the new correlations.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: FG02-00ER41132; PHY-1430152; PHY-1654379

OSTI ID:: 1799987

Journal Information:: Physical Review Letters, Vol. 123, Issue 20; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Toward an accurate strongly coupled many-body theory within the equation-of-motion framework Litvinova, Elena; Schuck, Peter Physical Review C, Vol. 100, Issue 6 https://doi.org/10.1103/physrevc.100.064320	journal	December 2019
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