Ground--state energies and widths of ${}^5$He and ${}^5$Li

Abstract

We extract energies and widths of the ground states of ${}^5$He and ${}^5$Li from recent single--level R--matrix fits to the spectra of the ${}^3$H$(\mathrm{d},\gamma$)${}^5$He and the ${}^3$He$(\mathrm{d},\gamma$)${}^5$Li reactions. The widths obtained differ significantly from the formal R--matrix values but they are close to those measured as full widths at half maxima of the spectra in various experiments. The energies are somewhat lower than those given by usual estimates of the peak positions. The extracted values are close to the S--matrix poles calculated previously from the multi--term analyses of the N-${}^4$He elastic scattering data.

3 pages, no figures, uses revtex.sty, accepted for publication in PRC, uuencoded postscript and tex-files available at ftp://is1.kph.tuwien.ac.at/pub/ohu/fwidth.uu

References in corpus (1)

• Reaction rate for two--neutron capture by ${}^4$He

Cited by in corpus (4)

• S-matrix and R-matrix determination of the low-energy He-5 and Li-5 resonance parameters
• Effects of unconventional breakup modes on incomplete fusion of weakly bound nuclei
• Effect of Coulomb Forces on the Position of the Pole in the Scattering Amplitude and on Its Residue
• Jost-matrix analysis of the resonance 5He*(3/2+) near the dt-threshold