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

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Author(s)

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

Department/unit(s)

Publication details

JournalPhysical Review C
DatePublished - Apr 2007
Issue number4
Volume75
Number of pages8
Pages (from-to)-
Original languageEnglish

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.

    Research areas

  • THERMONUCLEAR REACTION-RATES, R-PROCESS, SUPERNOVA BUBBLE, PHOTODISINTEGRATION, 9BE

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