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Interaction cross section and interaction radius of the 8B nucleus

1996; Elsevier BV; Volume: 609; Issue: 1 Linguagem: Inglês

10.1016/0375-9474(96)00267-9

1873-1554

M.M. Obuti, T. Kobayashi, D. Hirata, Yoko Ogawa, A. Ozawa, K. Sugimoto, I. Tanihata, D. Olson, W. Christie, H. Wieman,

Quantum Chromodynamics and Particle Interactions

Abstract The interaction cross section ( σ I ) was re-measured by a transmission-type measurement for 5 8 B 3 at 790 A ·MeV on a C target confirming the previously reported value. 8 B, although it has a very small proton separation energy 0.137 MeV, shows no remarkable enhancement of the σ I expected from a possible proton halo, as suggested from studies of the quadrupole moment and other recent data such as the reaction cross section at low energies. The root-mean-square (RMS) radius of the nucleon distribution has been deduced using the Glauber model. The relation between the halo tail and the separation energy is discussed on the mirror nuclei 8 B and 8 Li. It was also found that the previously reported narrow momentum distribution of 7 Be from the fragmentation of 8 B is well reproduced by the presently determined density distribution.