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Decay path measurements for the 2.429 MeV state in Be-9: Implications for the astrophysical alpha+alpha+n reaction

Papka, P, Brown, TAD, Fulton, BR, Watson, DL, Fox, SP, Groombridge, D, Freer, M, Clarke, NM, Ashwood, NI, Curtis, N, Ziman, V, McEwan, P, Ahmed, S, Catford, WN, Mahboub, D, Timis, CN, Baldwin, TD and Weisser, DC (2007) Decay path measurements for the 2.429 MeV state in Be-9: Implications for the astrophysical alpha+alpha+n reaction PHYSICAL REVIEW C, 75 (4). ? - ?. ISSN 0556-2813

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Abstract

An experiment was performed at the Australian National University to study the Be-9(Li-6,Li-6)Be-9(*) -> alpha + alpha + n reaction. This experiment was designed to study the breakup of Be-9, in an attempt to quantify the contribution played by the He-5 + alpha and Be-8(2+) + n channels for the low lying excited states. This information is required in order to resolve uncertainties in the alpha + alpha + n -> Be-9 reaction rate in high-energy and neutron-rich astrophysical environments such as supernovae. Angular correlation measurements have been used to deduce that the 2.429 MeV state breaks up almost exclusively via the Be-8(2+) channel. This method of identifying the break-up channel resolves the problem of distinguishing between the Be-8(2+) and He-5(g.s.) channels which are kinetically identical at this excitation energy.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Nuclear, Physics, THERMONUCLEAR REACTION-RATES, R-PROCESS, SUPERNOVA BUBBLE, PHOTODISINTEGRATION, 9BE
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Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:09
Last Modified: 23 Sep 2013 18:28
URI: http://epubs.surrey.ac.uk/id/eprint/419

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