Study of the ^56Ni(d,p)^57Ni Reaction and the Astrophysical ^56Ni(p,γ)^57Cu Reaction Rate.

Physics – Nuclear Physics

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Scientific paper

Beams of doubly-magic ^56Ni(T_1/2=6.1d) ions have been produced for the first time at ATLAS with the two-accelerator method. Using a high-efficiency Si detector array and the Fragment Mass Analyzer for particle identification, angular distributions for the inverse (d,p) reaction d(^56Ni,p)^57Ni have been measured. Spectroscopic factors for low-lying single-particle(?) states in ^57Ni have been obtained. With these spectropic factors, the yield for the ^56Ni(p,γ) reaction to the mirror nucleus ^57Cu has been calculated. The astrophysical rate for this reaction is found to be more than 10 times higher than previously assumed. Information on the d(^56Co,p)^57Co was obtained from the same measurement. This work was supported by the US Department of Energy, Nuclear Physics Division, under contract W-31-109-ENG-38 and by the NSF.

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