EXPLOSIVE HYDROGEN BURNING OF CL-35

Proton threshold states in Ar-36 have been studied via the reactions Cl-35(He-3, d)Ar-36, S-32(Li-6, d)Ar-36, S-32(alpha, gamma)Ar-36, Cl-35(p, gamma)Ar-36 and Cl-35(p, alpha)S-32 to investigate their influence on a possible SCl reaction cycle in explosive hydrogen burning. Three new states in Ar-36 have been observed in the (He-3, d) reaction at E(x) = 8806, 8887 and 8923 keV. Deuteron angular distributions were measured for 14 states near the Cl-35 + p threshold and were analyzed with DWBA calculations. Values of transferred orbital angular momenta, spectroscopic factors and proton partial widths were determined.: Gamma-ray spectra have been measured at ten (p, gamma) resonances. Three new resonances were observed at E(R) = 311, 416 and 627 keV, corresponding to Ar-36 states at E(x) = 8806, 8909 and 9117 keV, respectively. Excitation and resonance energies, gamma-ray branching ratios and resonance strengths are presented. The astrophysical implications of our results for explosive hydrogen burning of Cl-35 are discussed.