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

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.

arXiv comment5 Pages, 2 Figures, to be submitted to Phys. Rev. C

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