First measurement of the $^{34}\mathrm{S}(p,{\gamma})^{35}\mathrm{Cl}$ reaction rate through indirect methods for presolar nova grains

Gillespie, S.A.
Parikh, A.
Barton, C.J.
Faestermann, T.
José, J.
Hertenberger, R.
Wirth, H.F.
de Séréville, N.
Riley, J.E.
Williams, M.

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Publication date

January 2017

DOI

10.1103/PhysRevC.96.025801

Publisher

American Physical Society (APS)

Abstract

International audienceSulphur isotopic ratio measurements may help to establish the astrophysical sites in which certain presolar grains were formed. Nova model predictions of the S34/S32 ratio are, however, unreliable due to the lack of an experimental S34(p,γ)Cl35 reaction rate. To this end, we have measured the S34(He3,d)Cl35 reaction at 20 MeV using a high resolution quadrupole-dipole-dipole-dipole magnetic spectrograph. Twenty-two levels over 6.2 MeV <Ex(Cl35)<7.4 MeV were identified, ten of which were previously unobserved. Proton-transfer spectroscopic factors have been measured for the first time over the energy range relevant for novae. With this new spectroscopic information a new S34(p,γ)Cl35 reaction rate has been determined usi...