Ab initio estimation of E2 strengths in Li8 and its neighbors by normalization to the measured quadrupole moment

Caprio, Mark A.; Fasano, Patrick J.

doi:10.1103/physrevc.106.034320

Ab initio estimation of E2 strengths in Li 8 and its neighbors by normalization to the measured quadrupole moment

Journal Article · Mon Sep 26 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.106.034320· OSTI ID:1973186

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Univ. of Notre Dame, IN (United States); University of Notre Dame
Univ. of Notre Dame, IN (United States)

For electric quadrupole (E2) observables, which depend on the large-distance tails of the nuclear wave function, ab initio no-core configuration interaction (NCCI) calculations converge slowly, making meaningful predictions challenging to obtain. Nonetheless, the calculated values for different E2 matrix elements, particularly those involving levels with closely-related structure (e.g., within the same rotational band) are found to be robustly proportional. This observation suggests that a known value for one observable may be used to determine the overall scale of E2 strengths, and thereby provide predictions for others. In particular, we demonstrate that meaningful predictions for E2 transitions may be obtained by calibration to the ground-state quadrupole moment. Here, we test this approach for well-measured low-lying E2 transitions in ⁷Li and ⁹Be, then provide predictions for transitions in ⁸Li and ⁹Li. In particular, we address the 2⁺ → 1⁺ transition in ⁸Li, for which the reported measured strength exceeds ab initio Green's function Monte Carlo (GFMC) predictions by over an order of magnitude.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Notre Dame, IN (United States)

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

Grant/Contract Number:: AC02-05CH11231; FG02-95ER40934

OSTI ID:: 1973186

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 106; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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