Probing configuration mixing in Be12 with Gamow-Teller transition strengths

R. Meharchand, R. G.T. Zegers, B. A. Brown, Sam M. Austin, T. Baugher, D. Bazin, J. Deaven, A. Gade, G. F. Grinyer, C. J. Guess, M. E. Howard, H. Iwasaki, S. McDaniel, K. Meierbachtol, G. Perdikakis, J. Pereira, A. M. Prinke, A. Ratkiewicz, A. Signoracci, S. StrobergL. Valdez, P. Voss, K. A. Walsh, D. Weisshaar, R. Winkler

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We present a novel technique for studying the quenching of shell gaps in exotic isotopes. The method is based on extracting Gamow-Teller (ΔL=0, ΔS=1) transition strengths [B(GT)] to low-lying states from charge-exchange reactions at intermediate beam energies. These Gamow-Teller strengths are very sensitive to configuration mixing between cross-shell orbitals, and this technique thus provides an important complement to other tools currently used to study cross-shell mixing. This work focuses on the N=8 shell gap. We populated the ground and 2.24 MeV 0 + states in Be12 using the B12(1 +) (Li7, Be7) reaction at 80MeV/u in inverse kinematics. Using the ground-state B(GT) value from β-decay measurements (0.184±0.007) as a calibration, the B(GT) for the transition to the second 0 + state was determined to be 0.214±0.051. Comparing the extracted Gamow-Teller strengths with shell-model calculations, it was determined that the wave functions of the first and second 0 + states in Be12 are composed of 25±5% and 60±5% (0s)4 (0p)8 configurations, respectively.

Original languageEnglish
Article number122501
JournalPhysical Review Letters
Issue number12
StatePublished - Mar 19 2012


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