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Coriolis coupling effects in proton-pickup spectroscopic factors from B 12

  • Author(s): Macchiavelli, AO
  • Crawford, HL
  • Clark, RM
  • Fallon, P
  • Lee, IY
  • Morse, C
  • Campbell, CM
  • Cromaz, M
  • Santamaria, C
  • Chen, J
  • Hoffman, CR
  • Kay, BP
  • et al.
Abstract

Spectroscopic factors to low-lying negative-parity states in Be11 extracted from the B12(d,He3)Be11 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 3/21- and 5/21- states and suggested that deviations in the 1+ ground state of the odd-odd B12 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 B11, 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 B12, is key to explaining the proton-pickup data.

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