Isospin-Forbidden Decay Properties of the Lowest T = 2 States of Ne 20 </…
1970; American Institute of Physics; Volume: 1; Issue: 1 Linguagem: Inglês
10.1103/physrevc.1.184
ISSN1538-4497
AutoresRobert L. McGrath, Joseph Cerny, J. C. Hardy, George W. Goth, Akito Arima,
Tópico(s)Advanced Chemical Physics Studies
ResumoThe lowest $T=2$ states of $^{20}\mathrm{Ne}$, $^{24}\mathrm{Mg}$, $^{28}\mathrm{Si}$, $^{32}\mathrm{S}$, and $^{40}\mathrm{Ca}$ have been formed using the ($p, t$) reaction. The isospin-forbidden proton ($\ensuremath{\Delta}T=1 or 2$) and $\ensuremath{\alpha}$-particle ($\ensuremath{\Delta}T=2$) decay modes of these states have been determined by counting triton-proton and triton-$\ensuremath{\alpha}$ coincidence events. The major decay modes of the states are $^{20}\mathrm{Ne}({\ensuremath{\alpha}}_{1}+{\ensuremath{\alpha}}_{2}, {\ensuremath{\alpha}}_{3}+{\ensuremath{\alpha}}_{4})$, $^{24}\mathrm{Mg}({p}_{0})$, $^{28}\mathrm{Si}({\ensuremath{\alpha}}_{0})$, $^{32}\mathrm{S}({p}_{0})$, $^{40}\mathrm{Ca}({\ensuremath{\alpha}}_{0})$. Simple Coulomb calculations were performed for $^{40}\mathrm{Ca}$; these assumed pure shell-model configurations and considered isospin mixing in only the ($1d, 1f$) shells. They did not predict the relatively large $\ensuremath{\Delta}T=2$ isospin impurities necessary to explain the observed $\ensuremath{\alpha}$-particle decay.
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