Coriolis coupling effects in proton-pickup spectroscopic factors from $^{12}$B

TL;DR

This study investigates the effects of Coriolis coupling on proton-removal spectroscopic factors in $^{12}$B, using the Particle Rotor Model to better match experimental data and understand nuclear structure intricacies.

Contribution

The paper introduces the use of the Particle Rotor Model to incorporate Coriolis effects, improving the interpretation of proton-removal data in $^{12}$B and $^{11}$Be.

Findings

Good agreement with experimental level scheme of $^{11}$B

Moderate K-mixing of proton Nilsson levels explains data

Coriolis coupling effects are significant in proton pickup reactions

Abstract

Spectroscopic factors to low-lying negative-parity states in $^{11}$Be extracted from the $^{12}$B($d$,$^3$He)$^{11}$Be proton-removal reaction are interpreted within the rotational model. Earlier predictions of the $p$-wave proton removal strengths in the strong coupling limit of the Nilsson model underestimated the spectroscopic factors to the $3/2^-_1$ and $5/2^-_1$ states and suggested that deviations in the $1^+$ ground state of the odd-odd $^{12}$B due to Coriolis coupling should be further explored. In this work we use the Particle Rotor Model to take into account these effects and obtain a good description of the level scheme in $^{11}$B, with a moderate $K$-mixing of the proton Nilsson levels [110]1/2 and [101]3/2. This mixing, present in the $1^+$ bandhead of $^{12}$B, is key to explaining the proton pickup data.