First spin-parity constraint of the 306 keV resonance in Cl 35 for nova nucleosynthesis

K. A. Chipps, S. D. Pain, R. L. Kozub, D. W. Bardayan, J. A. Cizewski, K. Y. Chae, J. F. Liang, C. Matei, B. H. Moazen, C. D. Nesaraja, P. D. O'Malley, W. A. Peters, S. T. Pittman, K. T. Schmitt, M. S. Smith

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Of particular interest in astrophysics is the S34(p,γ)Cl35 reaction, which serves as a stepping stone in thermonuclear runaway reaction chains during a nova explosion. Though the isotopes involved are all stable, the reaction rate of this significant step is not well known, due to a lack of experimental spectroscopic information on states within the Gamow window above the proton separation threshold of Cl35. Measurements of level spins and parities provide input for the calculation of resonance strengths, which ultimately determine the astrophysical reaction rate of the S34(p,γ)Cl35 proton capture reaction. By performing the Cl37(p,t)Cl35 reaction in normal kinematics at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory, we have conducted a study of the region of astrophysical interest in Cl35, and have made the first-ever constraint on the spin and parity assignment for a level at 6677±15 keV (Er=306 keV), inside the Gamow window for novae.

Original languageEnglish (US)
Article number045808
JournalPhysical Review C
Issue number4
StatePublished - Apr 28 2017

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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