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Few-body calculations of proton- 6 , 8 He scattering

1998; American Institute of Physics; Volume: 57; Issue: 4 Linguagem: Inglês

10.1103/physrevc.57.1846

1538-4497

Jim Al-Khalili, J. A. Tostevin,

Quantum Chromodynamics and Particle Interactions

We present a theoretical analysis of recently published experimental data for the elastic scattering of protons from the helium isotopes ${}^{6}\mathrm{He}$ and ${}^{8}\mathrm{He}$ at energies near 700 MeV per nucleon. The analysis treats the few-body degrees of freedom of these light neutron-rich nuclei explicitly and is developed in terms of three- and five-body wave functions for ${}^{6}\mathrm{He}$ and ${}^{8}\mathrm{He}$, respectively. Comparisons of calculations with the data show that the sizes of the He nuclei consistent with such an analysis are larger by about 0.2 fm than those deduced from a more approximate procedure in which the structure of the weakly bound nuclei enters only through an assumed nuclear matter density.