14th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2022)

Constraining the 30P(p,γ)31S reaction using 30P(d,p γ)31P with GODDESS

Sep 2, 2022, 11:25 AM

25m

Narcissus/Orange

Parallel session talk PNA: Particle and Nuclear Astrophysics

Speakers

Kate Grzywacz Jones (University of Tennessee Knoxville) Rajesh Ghimire (University of Tennessee) Steve Pain (ORNL) The GODDESS collaboration

Description

During classical nova nucleosynthesis, the 30P(p,gamma)31S reaction rate critically affects the mass flow into the A=30-40 range, impacting the abundances of isotopes of phosphorus, sulfur, and silicon. Direct measurement of the (p,γ) reaction is not currently possible due to insufficient beam intensities. The rate of this reaction depends on undetermined spectroscopic strengths of low-lying resonances in 31S, located between 6 and 7 MeV in excitation energy. Due to experimental challenges to measure the proton spectroscopic factors on unstable nuclei, we performed a 30P(d,pγ)31P neutron transfer reaction measurement using the newly commissioned GODDESS (GRETINA-ORRUBA: Dual Detectors for Experimental Structure Studies) detection system—with an 8 MeV/u 30P beam, from RAISOR at ATLAS, in order to provide constraints on the spectroscopic strengths for 31S levels via mirror symmetry. Details of the experiment and data analysis, including excitation energy spectra, proton-γ matrices, angular distributions, and spectroscopic factors, will be presented.