High-resolution study of 11B to 11C Gamow-Teller strengths as a test case of ab initio shell-model calculations -: art. no. 011306

A high energy-resolution B-11 (He-3,t)C-11 experiment was performed at 0degrees and an intermediate incident energy of 140 MeV/nucleon for the study of precise Gamow-Teller (GT) transition strengths. Two doublet states at approximate to4.5 and approximate to8.4 MeV were clearly resolved with a resolution of 45 keV. The strengths are compared with a calculation using an ab initio no-core shell model, which became available for the A=11 system recently. It was found that a calculation including a three-nucleon interaction better reproduces the observed GT transition strengths.