Evidence for the existence of the astrophysically important 6.40-MeV state of S-31

TitleEvidence for the existence of the astrophysically important 6.40-MeV state of S-31
Publication TypeJournal Article
Year of Publication2013
AuthorsIrvine, D., A. A. Chen, A. Parikh, K. Setoodehnia, T. Faestermann, R. Hertenberger, H. F. Wirth, V. Bildstein, S. Bishop, J. A. Clark, C. M. Deibel, J. Hendriks, C. Herlitzius, R. Krucken, W. N. Lennard, O. Lepyoshkina, R. Longland, G. Rugel, D. Seiler, K. Straub, and C. Wrede
JournalPhysical Review C
Volume88
Issue5
Date PublishedNov
ISBN Number0556-2813
Accession NumberWOS:000327935700011
AbstractProton-unbound excited states of S-31 have been populated with the S-32(d, t)S-31 reaction at a beam energy of 24 MeV. Tritons corresponding to S-31 states with E-x(S-31) approximate to 6.3-7.1 MeV were momentum analyzed with a high resolution quadrupole-dipole-dipole-dipole (Q3D) magnetic spectrograph at six angles ranging from theta(lab) = 15 degrees to 58.5 degrees. We report a statistically significant detection of an astrophysically important state at E-x(S-31) = 6402 (2) keV, whose existence as a third state in this region has been under debate. Using updated A = 31 nuclear structure information, we present a new set of proposed S-31-P-31 mirror assignments for 31S, in which this state is tentatively assigned a spin of 7/2. This level, corresponding to a P-30 + p resonance at 271 keV, is likely to have a significant influence on the P-30(p, gamma)S-31 reaction rate in explosive hydrogen burning in classical novae.
URL<Go to ISI>://WOS:000327935700011
DOI10.1103/PhysRevC.88.055803
Short TitleEvidence for the existence of the astrophysically important 6.40-MeV state of S-31
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