Search for T = 3 2 States in Li 5 <mml:mrow…
1968; American Institute of Physics; Volume: 165; Issue: 4 Linguagem: Inglês
10.1103/physrev.165.1126
ISSN1536-6065
AutoresRobert L. McGrath, Joseph Cerny, S. W. Cosper,
Tópico(s)Dark Matter and Cosmic Phenomena
ResumoThree experiments to search for $T=\frac{3}{2}$ mass-5 analog states have been performed. Both triton energy spectra from the $^{7}\mathrm{Li}(p,t)^{5}\mathrm{Li}$ reaction and particle-particle coincidence data on the $^{7}\mathrm{Li}(p,t)^{5}\mathrm{Li}$ and $^{7}\mathrm{Li}(p,^{3}\mathrm{He})^{5}\mathrm{He}$ reactions failed to reveal well-defined $^{5}\mathrm{Li}$ or $^{5}\mathrm{He}$ states having expected $T=\frac{3}{2}$ properties. Tentative evidence is found from these measurements for broad $T=\frac{1}{2}$ states at 22-, 25-, and 34-MeV excitation energy. $^{8}\mathrm{B}$ energy spectra from the $^{9}\mathrm{Be}(\ensuremath{\alpha},^{8}\mathrm{B})^{5}\mathrm{H}$ reaction also exhibited no peaks which might be associated with sharp states of $^{5}\mathrm{H}$. These results are qualitatively in agreement with several theoretical predictions that $^{5}\mathrm{H}$ is unbound to particle emission by at least several MeV.
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