The Beta Delayed Proton and Gamma Decay of 27P For Nuclear Astrophysics

Abstract

Abstract. The creation site of 26Al 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 Hburning in outer shells of red giant stars. Also, the reactions for its creation or destruction are not completely known. P and it can also be destroyed directly. The reaction 26m Al(p,γ) 27 Si* is another avenue to bypass the production of 26 Al and it is dominated by resonant capture. We study these resonances by an indirect method, through the β-decay of 27 P. We use 27 P produced and separated with MARS and a setup which allows increased efficiency for low energy protons and for high-energy gamma-rays. We measure gamma-rays and β-delayed protons emitted from states above the proton threshold in the daughter nucleus 27 Si to identify and characterize the resonances. Its lifetime was also measured with accuracy under 1%.

Decay spectroscopic for nuclear astrophysics

“…Some results were already published or presented at other conferences [2][3][4][5][6], some are new, and many are still preliminary. Two contributions by our students Ellen Simmons and Alex Spiridon, contributions present in this volume [7,8], will treat specific results of this work and I will insist less on those in this paper, as I did in the actual talk.…”