Study of astrophysically important resonant states in 30S Using the 28Si(3He, nγ)30S reaction

The ²⁹P(p,γ)³⁰S reaction rate strongly affects explosive hydrogen burning in classical novae and type I X-ray bursts, and depends on the structure of proton unbound ³⁰S states. The rate in the temperature characteristic of nucleosynthesis in novae and X-ray bursts had been previously predicted to be dominated by two low-lying, unobserved, Jπ = 3⁺ and 2⁺ resonances above the proton threshold in ³⁰S. Since then, two states have been found at 4699(6) keV and 4814(3) keV, which were tentatively assigned to be the 3⁺ and 2 ⁺ states, respectively. To confirm the existence of these two levels and their energies, the structure of ³⁰S was investigated via an in-beam g -ray spectroscopy experiment using the ²⁸Si(³He, nγ )³⁰S reaction at University of Tsukuba Tandem Accelerator Complex in Japan. This work describes the experimental setup and presents the preliminary results. © Copyright owned by the author(s).