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

Journal Article · Sun Apr 15 00:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.045803· OSTI ID:20995238

Papka, P; Brown, T A. D.; Fulton, B R; Watson, D L; Fox, S P; Groombridge, D; Freer, M; Clarke, N M; Ashwood, N I; Curtis, N; Ziman, V; McEwan, P; Ahmed, S; Catford, W N; Mahboub, D; Timis, C N; Baldwin, T D; Weisser, D C ^[1]

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1. Department of Physics, University of York, York YO10 5DD (United Kingdom)

An experiment was performed at the Australian National University to study the {sup 9}Be({sup 6}Li,{sup 6}Li){sup 9}Be*{yields}{alpha}+{alpha}+n reaction. This experiment was designed to study the breakup of {sup 9}Be, in an attempt to quantify the contribution played by the {sup 5}He+{alpha} and {sup 8}Be{sup 2{sup ++}}n channels for the low lying excited states. This information is required in order to resolve uncertainties in the {alpha}+{alpha}+n{yields} {sup 9}Be 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 {sup 8}Be{sup 2{sup +}} channel. This method of identifying the break-up channel resolves the problem of distinguishing between the {sup 8}Be{sup 2{sup +}} and {sup 5}He{sup g.s.} channels which are kinetically identical at this excitation energy.

• OSTI ID: 20995238
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 75, Issue 4; Other Information: DOI: 10.1103/PhysRevC.75.045803; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
BERYLLIUM 9
DECAY
EXCITATION
EXCITED STATES
HELIUM 5
LITHIUM 6
MEV RANGE
NEUTRONS
REACTION KINETICS