The importance of 15O(a,g)19Ne to X-ray bursts and superbursts

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dc.creatorFisker, Jacob Lund
dc.creatorGorres, Joachim
dc.creatorWiescher, Michael
dc.creatorDavids, Barry
dc.date2004-10-23
dc.date2006-06-21
dc.date.accessioned2026-07-07T10:47:56Z
dc.date.available2026-07-07T10:47:56Z
dc.descriptionOne of the two breakout reactions from the hot CNOcycle is 15O(a,g)19Ne, which at low temperatures depends strongly on the resonance strength of the 4.033 MeV state in 19Ne. An experimental upper limit has been placed on its strength, but the lower limit on the resonance strength and thereby the astrophysical reaction rate is unconstrained experimentally. However, this breakout reaction is crucial to the thermonuclear runaway which causes type I X-ray bursts on accreting neutron stars. In this paper we exploit astronomical observations in an attempt to constrain the relevant nuclear physics and deduce a lower limit on the reaction rate. Our sensitivity study implies that if the rate were sufficiently small, accreting material would burn stably without bursts. The existence of type I X-ray bursts and superbursts consequently suggests a lower limit on the 15O(a,g)19Ne reaction rate at low temperatures.
dc.description10 pages, 4 figures, uses apj.sty, accepted for publ. in Astrophys. J
dc.identifierhttps://arxiv.org/abs/astro-ph/0410561
dc.identifierhttp://arxiv.org/abs/astro-ph/0410561
dc.identifierAstrophys.J.650:332-337,2006
dc.identifierdoi:10.1086/507083
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183705
dc.subjectAstrophysics
dc.subjectNuclear Experiment
dc.titleThe importance of 15O(a,g)19Ne to X-ray bursts and superbursts
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