학술논문
Single neutron transfer on 23Ne and its relevance forthepathway ofnucleosynthesis in astrophysical X-ray bursts
Document Type
Working Paper
Author
Lotay, G.; Henderson, J.; Catford, W. N.; Ali, F. A.; Berean, J.; Bernier, N.; Bhattacharjee, S. S.; Bowry, M.; Caballero-Folch, R.; Davids, B.; Drake, T. E.; Garnsworthy, A. B.; GhaziMoradi, F.; Gillespie, S. A.; Greaves, B.; Hackman, G.; Hallam, S.; Hymers, D.; Kasanda, E.; Levy, D.; Luna, B. K.; Mathews, A.; Meisel, Z.; Moukaddam, M.; Muecher, D.; Olaizola, B.; Orr, N. A.; Patel, H. P.; Rajabali, M. M.; Saito, Y.; Smallcombe, J.; Spencer, M.; Svensson, C. E.; Whitmore, K.; Williams, M.
Source
Subject
Language
Abstract
We present new experimental measurements of resonance strengths in the astrophysical 23Al(p, {\gamma})24Si reaction, constraining the pathway of nucleosynthesis beyond 22Mg in X-ray burster scenarios. Specifically, we have performed the first measurement of the (d, p) reaction using a radioactive beam of 23Ne to explore levels in 24Ne, the mirror analog of 24Si. Four strong single-particle states were observed and corresponding neutron spectroscopic factors were extracted with a precision of {\sim}20{\%}. Using these spectroscopic factors, together with mirror state identifications, we have reduced uncertainties in the strength of the key {\ell} = 0 resonance at Er= 157 keV, in the astrophysical 23Al(p, {\gamma}) reaction, by a factor of 4. Our results show that the 22Mg(p, {\gamma})23Al(p, {\gamma}) pathway dominates over the competing 22Mg({\alpha}, p) reaction in all but the most energetic X-ray burster events (T>0.85GK), significantly affecting energy production and the preservation of hydrogen fuel.
Comment: 5 pages, 3 figures
Comment: 5 pages, 3 figures