Probing spin-isospin excitations in proton-rich nuclei via the 11C(p, n)11N reaction

Tracking the evolution of nuclear properties away from stability serves as a valuable test for nuclear models. In the present work, the (p, n) charge-exchange reaction was used to test the extraction of beta- Gamow-Teller transition strengths, B(GT), from proton-rich unstable isotopes, and the resulting B(GT) values were compared to shell-model and ab initio calculations. The 11C(p, n)11N reaction was measured in inverse kinematics at 95 MeV/u at the National Superconducting Cyclotron Laboratory. The B(GT) values to the 1 - state at 0.73 MeV 2 and the 3 - state at 2.86 MeV in 11N were determined to be 0.18(1)stat(3)sys and 0.18(1)stat(4)sys, respectively. 2 These results are consistent with shell-model calculations using the wbp interaction after introducing a phe-nomenological quenching factor and with ab initio variational Monte Carlo calculations using the NV 2 + 3Ia* NN and 3N interactions without any scaling. Additionally, this result is consistent with the B(GT) values extracted from mirror 11B(n, p) and 11B(t, 3He) reactions. This experiment demonstrates the feasibility of using the (p, n) probe in inverse kinematics to extract B(GT) from proton-rich nuclei, although improved background suppression will be important in future experiments.

Automated summary

In this study, the (p, n) charge-exchange reaction was used to test the extraction of beta-Gamow-Teller transition strengths, B(GT), from proton-rich unstable isotopes. The results were compared to shell-model and ab initio calculations, and demonstrated the feasibility of using this method.