A folding model for crystal defects in the shape analysis of blocking lifetime measurements |
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Authors: | S Alliney F Malaguti E Verondini |
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Affiliation: | Dipartimento di Matematica, Università di Bologna, and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Bologna, Italy;Dipartimento di Fisica, Università di Bologna, and Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Bologna, Italy |
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Abstract: | A new method of analysis is presented for experiments that measure nuclear reaction times exploiting the blocking effect in single-crystals. It is based upon a direct comparison between measured and calculated blocking patterns, obtained by folding the angular distribution for perfect crystals with a function describing the influence of the defects. Such a function is found by comparing measured and calculated “prompt” patterns. The resulting equations are solved using Tikhonov's regularization procedure. The whole method is applied to a reanalysis of an earlier series of results on the 27Al (p, α0) resonance at Ep=632.2 keV. The resulting lifetime of the 28Si 12.195 MeV level, τ = (85.3 ± 5.3) as, agrees with that deduced from resonance reaction yields, and is somewhat different from an earlier analysis based on the filling-in parameter R. |
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