B 11 states above the α -decay threshold via the B 10 ( d , p ) B 11 reaction

Le résumé fourni par la source

The resonance region of $^{11}\mathrm{B}$ covering excitation energies from 8.4 to 13.6 MeV was investigated with the $(d,p)$ reaction performed on an enriched $^{10}\mathrm{B}$ target at the Florida State University Super-Enge Split-Pole Spectrograph of the John D. Fox Superconducting Linear Accelerator Laboratory. Complementary measurements were performed with a target enriched in $^{11}\mathrm{B}$ to identify possible $^{12}\mathrm{B}$ contaminants in the $(d,p)$ reaction. Four strongly populated $^{11}\mathrm{B}$ states were observed above the $\ensuremath{\alpha}$-decay threshold. Angular distributions were measured and compared to distorted wave Born approximation (DWBA) calculations to extract angular momentum transfers and $^{10}\mathrm{B}({3}^{+})+n$ spectroscopic factors. The recently observed and heavily discussed resonance at 11.4 MeV in $^{11}\mathrm{B}$ was not observed in this work. This result is consistent with the interpretation that it is predominantly a $^{10}\mathrm{Be}({0}^{+})+p$ resonance with a possible additional $^{7}\mathrm{Li}+\ensuremath{\alpha}$ contribution. The predicted $^{10}\mathrm{B}({3}^{+})+n$ resonance at 11.6 MeV, analogous to the 11.4-MeV proton resonance, was not observed either. Upper limits for the $^{10}\mathrm{B}({3}^{+})+n$ spectroscopic factors of the 11.4- and 11.6-MeV states were determined. In addition, supporting configuration interaction shell model calculations with the effective WBP interaction are presented.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.