Constraint on the Ground-state Mass of 21Al and Three-Nucleon Forces
Abstract
Fragmentation cross section of Si + Be reaction at 75.8 MeV/u was analyzed for studying the decay mode of single-proton emission in Al (the proton-rich nucleus with neutron closed-shell of and ). With the comparison between the measured fragmentation cross section and the theoretical cross section produced by EPAX3.1a for the observed nuclei (i.e. Mg, Al and Si), the expected yield for a particle stable Al was estimated. With the exponential decay law, an upper limit of half-life of ns was determined. Using the single-proton penetration model, the upper limit of single-proton separation energy of keV was deduced. This deduced mass limit agrees with the microscopic calculation based on nucleon-nucleon (NN) + three-nucleon (3N) forces in valence space, which indicates the importance of 3N forces in Al.
Keywords
Cite
@article{arxiv.1704.03249,
title = {Constraint on the Ground-state Mass of 21Al and Three-Nucleon Forces},
author = {X. Z. Teng and C. E. Teh and J. Lee and X. X. Xu and C. J. Lin and L. J. Sun and J. S. Wang and D. Q. Fang and S. Leblond and Z. H. Li and J. Li and N. R. Ma and J. B. Ma and H. L. Zang and P. Ma and S. L. Jin and M. R. Huang and Z. Bai and J. J. Liu and T. Lokotko and F. Yang and H. M. Jia and D. X. Wang and Y. Y. Yang and Z. G. Hu and M. Wang and H. Q. Zhang},
journal= {arXiv preprint arXiv:1704.03249},
year = {2017}
}
Comments
3 pages, 2 figures