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Probing Spin-isospin Excitations in Proton-rich Nuclei Via the 11C(p, N)11N Reaction

出版	Michigan State University. Physics, 2022
ISBN	9798837516993
URL	http://books.google.com.hk/books?id=mnnIzwEACAAJ&hl=&source=gbs_api

註釋Understanding nuclear structure and predicting nuclear properties from first principles are major goals of nuclear physics research. Many nuclear models have been created for these purposes, and benchmarking them with new data is critical for their continued development. Exotic nuclei provide fertile testing grounds for nuclear models because nuclear properties evolve and new phenomena emerge as one moves away from stability towards the driplines. In the present work, the 11C(p,n)11N reaction was measured in inverse kinematics at 95 MeV/u at the National Superconducting Cyclotron Laboratory to both provide a benchmark for current models and to lay the groundwork for future experiments. The Gamow-Teller transition strength, B(GT), was extracted from the measured cross section using a well-established proportionality relationship between the charge-exchange cross section and B(GT). The results were B(GT) = 0.18(1)stat(3)sys to the first 1/2- state and B(GT) = 0.18(1)stat(4)sys to the first 3/2- state in 11N. These results are consistent with shell-model calculations after introducing a phenomenological quenching factor and with ab-initio Variational Monte Carlo calculations without any scaling. These results are also consistent with B(GT) values extracted from mirror 11B(n,p) and 11B(t,3He) reactions, assuming isospin symmetry. Additionally, this experiment demonstrates the feasibility of using the (p,n) probe in inverse kinematics to extract B(GT) from transitions to proton-rich unbound nuclei, although improved background suppression will be critical in future experiments.