Spin and isospin characteristics of the excited states ofAr36through the reactionS32(α, γ)Ar36in the bombarding energy rangeEα=4 to 5MeV

Abstract

The $\ensuremath{\alpha}$ capture reaction $^{32}\mathrm{S}(\ensuremath{\alpha}, \ensuremath{\gamma})^{36}\mathrm{Ar}$ was studied in the bombarding energy range of ${E}_{\ensuremath{\alpha}}=4.13 \mathrm{to} 5.00$ MeV corresponding to the excitation energy range of ${E}_{x}=10.31 \mathrm{to} 11.08$ MeV in $^{36}\mathrm{Ar}$. Seven resonances have been located and their resonance strengths determined. Two of the resonances decay predominantly to the ground state while the other five decay predominantly to the first excited state of $^{36}\mathrm{Ar}$. Angular distribution measurements of the predominant decay gamma ray have been performed and the spin and parity of all the resonances assigned. The isospin of two of the resonances have been assigned as $T=0$ while $T=1$ has been assigned for three others. Evidence has been obtained for the operation of the isospin selection rule for the dipole ($E1$ and $M1$) and quadrupole ($E2$) gamma decay.NUCLEAR REACTIONS $^{32}\mathrm{S}(\ensuremath{\alpha}, \ensuremath{\gamma})^{36}\mathrm{Ar}$, ${E}_{\ensuremath{\alpha}}=4.13 \mathrm{to} 5.00$ MeV; measured resonance strengths, angular distributions; deduced ${J}^{\ensuremath{\pi}}$, $T$ of the resonances, enriched target.