Measurement of the decay branching ratios of the α-unbound states in Ne19 and the O15(α,γ) reaction rate

Details Measurement of the decay branching ratios of the α-unbound states in Ne19 and the O15(α,γ) reaction rate Measurement of the decay branching ratios of the α-unbound states in Ne19 and the O15(α,γ) reaction rate

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvc..79e5805t&link_type=abstract

Physical Review C, vol. 79, Issue 5, id. 055805

Astronomy and Astrophysics

Astrophysics

2

Explosive Burning In Accreting Binary Systems, Alpha Decay, 3H-, 3He-, And 4He-Induced Reactions, 6<=A<=19

Scientific paper

The breakout reaction O15(α,γ)Ne19 from the hot CNO cycle is critical to understanding explosive astrophysical phenomena such as x-ray bursts. In spite of considerable past experimental effort via indirect methods, this reaction rate remained mostly uncertain until our recent measurement [Phys. Rev. Lett. 98, 242503 (2007)] of the eluding α-decay branching ratios of the near-threshold states in Ne19, particularly the critical level at 4.03 MeV. In this paper, we present more details of and deeper insights into the measurement and the uncertainties of the experimental results. The α-unbound states in Ne19 were populated via the reaction F19(He3,t), and the α-decay branch was observed from t-α coincidences using a low-energy particle detection array and the TWINSOL facility at the University of Notre Dame. In particular, the measured branching ratio of the 4.03-MeV state is 2.9±2.1×10-4. In combination with previous measurements of the lifetimes of these states, a new experimental reaction rate of O15(α,γ)Ne19 is proposed and discussed in the astrophysical scenario. Further experimental investigations are necessary to reduce the remaining uncertainties.

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