The resonance region of 11B covering excitation energies from 8.4 MeV to 13.6 MeV was investigated with the (d,p) reaction performed on an enriched 10B 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 11B to identify possible 12B contaminants in the (d,p) reaction. Four strongly populated 11B states were observed above the α-decay threshold. Angular distributions were measured and compared to DWBA calculations to extract angular momentum transfers and 10B(3+)+n spectroscopic factors. The recently observed and heavily discussed resonance at 11.4 MeV in 11B was not observed in this work. This result is consistent with the interpretation that it is predominantly a 10Be(0+)+p resonance with a possible additional 7Li+α contribution. The predicted 10B(3+)+n resonance at 11.6 MeV, analogous to the 11.4-MeV proton resonance, was not observed either. Upper limits for the 10B(3+)+n spectroscopic factors of the 11.4-MeV and 11.6-MeV states were determined. In addition, supporting configuration interaction shell model calculations with the effective WBP interaction are presented.
@article{arxiv.2411.09831,
title = {$^{11}$B states above the $\alpha$-decay threshold studied via $^{10}$B$(d,p){}^{11}$B},
author = {A. N. Kuchera and G. Ryan and G. Selby and D. Snider and S. Anderson and S. Almaraz-Calderon and L. T. Baby and B. A. Brown and K. Hanselman and E. Lopez-Saavedra and K. T. Macon and G. W. McCann and K. W. Kemper and M. Spieker and I. Wiedenhöver},
journal= {arXiv preprint arXiv:2411.09831},
year = {2024}
}
Comments
7 pages, 3 figures, accepted for publication in Physical Review C as regular article