The beta-delayed proton and gamma decay of P for nuclear astrophysics

E. Simmons, L. Trache, A. Banu, M. McCleskey, B. Roeder, A. Spiridon, R.E. Tribble, T. Davinson, P.J. Woods, G.J. Lotay, J. Wallace, D. Doherty, A. Saastamoinen

Research output: Contribution to journalArticlepeer-review

Abstract

The creation site of Al is still under debate. It is thought to be produced in hydrogen burning and in explosive helium burning in novae and supernovae, and possibly also in the H-burning in outer shells of red giant stars. Also, the reactions for its creation or destruction are not completely known. When Al is created in novae, the reaction chain is: Mg(p,γ)AI(βv) Mg(p,γ)Al, but this chain can be by-passed by another chain, Al(p, γ)Si(p, γ)P and it can also be destroyed directly. The reaction Al (p, γ) Si* is another avenue to bypass the production of Al and it is dominated by resonant capture. We find and study these resonances by an indirect method, through the beta-decay of P. A clean and abundant source of P was produced for the first time and separated with MARS. A new implantation-decay station which allows increased efficiency for low energy protons and for high-energy gamma-rays was used. We measured gamma-rays and beta-delayed protons emitted from states above the proton threshold in the daughter nucleus Si to identify and characterize the resonances. The lifetime of P was also measured with accuracy under 2%.
Original languageEnglish
Article number012152
Number of pages7
JournalJournal of Physics: Conference Series
Volume420
Issue number1
DOIs
Publication statusPublished - 1 Jan 2013
Event11th International Conference on Nucleus-Nucleus Collisions (NN) - San Antonio, United Kingdom
Duration: 27 May 20121 Jun 2012

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