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dc.contributor.authorGillespie, S
dc.contributor.authorParikh, A.
dc.contributor.authorBarton, C
dc.contributor.authorFaestermann, Thomas
dc.contributor.authorJosé Pont, Jordi
dc.contributor.authorHertenberger, R.
dc.contributor.authorWirth, Hans Friedrich
dc.contributor.authorde Séréville, N
dc.contributor.authorRiley, J
dc.contributor.authorWilliams, M
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationGillespie, S., Parikh, A., Barton, C., Faestermann, T., Jose, J., Hertenberger, R., Wirth, H., de Séréville, N., Riley, J., Williams, M. First measurement of the 34S(p,gamma)35Cl reaction rate through indirect methods for presolar nova grains. "Physical Review C", 2 Agost 2017, vol. 96, núm. 2, p. 1-8.
dc.description.abstractSulphur isotopic ratio measurements may help to establish the astrophysical sites in which certain presolar grains were formed. Nova model predictions of the 34S/32S ratio are, however, unreliable due to the lack of an experimental 34S(p,¿)35Cl reaction rate. To this end, we have measured the 34S(3He,d)35Cl reaction at 20 MeV using a high resolution quadrupole-dipole-dipole-dipole magnetic spectrograph. Twenty-two levels over 6.2 MeV <Ex(35Cl)<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 34S(p,¿)35Cl reaction rate has been determined using a Monte Carlo method. Hydrodynamic nova model calculations have been performed using this new reaction rate. These models show that remaining uncertainties in the 34S(p,¿) rate affect nucleosynthesis predictions by less than a factor of 1.4, and predict a 34S/32S isotopic ratio of 0.014–0.017. Since recent type II supernova models predict 34S/32S=0.026-0.053, the 34S/32S isotopic ratio may be used, in conjunction with other isotopic signatures, to distinguish presolar grains from oxygen-neon nova and type II supernova origin. Our results address a key nuclear physics uncertainty on which recent considerations discounting the nova origin of several grains depend.
dc.format.extent8 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Física::Astronomia i astrofísica
dc.titleFirst measurement of the 34S(p,gamma)35Cl reaction rate through indirect methods for presolar nova grains
dc.contributor.groupUniversitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
local.citation.authorGillespie, S.; Parikh, A.; Barton, C.; Faestermann, T.; Jose, J.; Hertenberger, R.; Wirth, H.; de Séréville, N.; Riley, J.; Williams, M.
local.citation.publicationNamePhysical Review C

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