학술논문
Measurement of key resonance states for the P30(p,γ)S31 reaction rate, and the production of intermediate-mass elements in nova explosions
Document Type
article
Author
A. Kankainen; P.J. Woods; H. Schatz; T. Poxon-Pearson; D.T. Doherty; V. Bader; T. Baugher; D. Bazin; B.A. Brown; J. Browne; A. Estrade; A. Gade; J. José; A. Kontos; C. Langer; G. Lotay; Z. Meisel; F. Montes; S. Noji; F. Nunes; G. Perdikakis; J. Pereira; F. Recchia; T. Redpath; R. Stroberg; M. Scott; D. Seweryniak; J. Stevens; D. Weisshaar; K. Wimmer; R. Zegers
Source
Physics Letters B, Vol 769, Iss C, Pp 549-553 (2017)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
Abstract
We report the first experimental constraints on spectroscopic factors and strengths of key resonances in the P30(p,γ)S31 reaction critical for determining the production of intermediate-mass elements up to Ca in nova ejecta. The P30(d,n)S31 reaction was studied in inverse kinematics using the GRETINA γ-ray array to measure the angle-integrated cross-sections of states above the proton threshold. In general, negative-parity states are found to be most strongly produced but the absolute values of spectroscopic factors are typically an order of magnitude lower than predicted by the shell-model calculations employing WBP Hamiltonian for the negative-parity states. The results clearly indicate the dominance of a single 3/2− resonance state at 196 keV in the region of nova burning T≈0.10–0.17 GK, well within the region of interest for nova nucleosynthesis. Hydrodynamic simulations of nova explosions have been performed to demonstrate the effect on the composition of nova ejecta.