The elusive β−p+ decay was observed in 11Be by directly measuring the emitted protons and their energy distribution for the first time with the prototype Active Target Time Projection Chamber (pAT-TPC) in an experiment performed at ISAC-TRIUMF. The measured β−p+ branching ratio is orders of magnitude larger than any previous theoretical model predicted. This can be explained by the presence of a narrow resonance in 11B above the proton separation energy.
@article{arxiv.1907.00114,
title = {Direct observation of proton emission in 11Be},
author = {Y. Ayyad and B. Olaizola and W. Mittig and G. Potel and V. Zelevinsky and M. Horoi and S. Beceiro-Novo and M. Alcorta and C. Andreoiu and T. Ahn and M. Anholm and L. Atar and A. Babu and D. Bazin and N. Bernier and S. S. Bhattacharjee and M. Bowry and R. Caballero-Folch and M. Cortesi and C. Dalitz and E. Dunling and A. B. Garnsworthy and M. Holl and B. Kootte and K. G. Leach and J. S. Randhawa and Y. Saito and C. Santamaria and P. Šiuryte and C. E. Svensson and R. Umashankar and N. Watwood and D. Yates},
journal= {arXiv preprint arXiv:1907.00114},
year = {2019}
}