Excitation of the 2.65 MeV state in the 20Ne(p,n)20Na reaction at 135 MeV

Physics – Nuclear Physics

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Charge-Exchange Reactions, Shell Model, Coupled-Channel And Distorted-Wave Models, 20<=A<=38

Scientific paper

The 20Ne(p,n)20Na reaction at 135 MeV was studied experimentally using the beam-swinger neutron time-of-flight facility at the Indiana University Cyclotron Facility. Backgrounds ~10× lower than an earlier experiment were obtained using the ``stripper loop'' storage ring to achieve ~2 μs between beam bursts. We were able to see a weakly excited state at 2.65 MeV in 20Na with a Δl=2 angular distribution. The angular distribution is consistent with a DWIA calculation assuming a 3+ final state. The characteristics of this state are important to know for considerations of possible breakout in the hot CNO cycle in supernovae explosions.

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