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B(GT) strength from beta-decay measurements and inferred shape mixing in Kr-74

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B(GT) strength from beta-decay measurements and inferred shape mixing in Kr-74

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Poirier, E.; Algora, Alejandro; Cano Ott, Daniel; Gelletly, W.; Jungclaus, Andrea; Nácher González, Enrique; Rubio Barroso, Berta; Taín Enríquez, José Luis

Aquest document és un/a article, creat/da en: 2004

A total absorption spectrometer, dedicated to the study of very short-lived atomic species, has been built and installed at the CERN/ISOLDE mass separator. The beta decay of the neutron-deficient Kr-74 nucleus has been studied using this new device. The Gamow-Teller strength distribution has been observed over most of the Q(EC) window, and a total strength of 0.69(3) g(A)(2)/4pi has been measured for states with excitation energy below 3 MeV. Shape mixing in the Kr-74 ground state is inferred from a comparison of the experimental strength distribution with self-consistent, deformed, quasiparticle-random-phase-approximation calculations.

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