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        First beta-decay studies of the neutron-rich isotopes Sc53-55 and V56-59

        Author
        Sorlin, O.
        Borrel, V.
        Grevy, S.
        Guillemaud-Mueller, D.
        Mueller, A.C.
        Pougheon, F.
        Bohmer, W.
        Kratz, K.L.
        Mehren, T.
        Moller, P.
        Pfeiffer, B.
        Rauscher, T.
        Saint-Laurent, M.G.
        Anne, R.
        Lewitowicz, M.
        Ostrowski, A.
        Dorfler, T.
        Schmidt-Ott, W.D.
        Attention
        2299/11032
        Abstract
        The neutron-rich isotopes Sc53-55 and V56-59 have been produced at GANIL in interactions of a 64.5 MeV/u Cu-65 beam with a Be-9 target. They were separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives and subsequent low-energy gamma-rays were observed for the first time. The present results are compared to QRPA model predictions. The quick drop of the half-life observed at N = 33 for Ca-53(20)33 is water V-56(23)33 and absent for Sc-54(21)33, indicating a vanishing of the N = 32 subshell north to Ca-52(32). In an astrophysical context, these neutron-rich isotopes represent r-process progenitors which, after beta-decay, would produce the correlated isotopic over-abundances of Cr-54, Fe-58, Ni-64 in certain refractory inclusions of meteorites. (C) 1998 Elsevier Science B.V.
        Publication date
        1998-03-16
        Published in
        Nuclear Physics A
        Other links
        http://hdl.handle.net/2299/11032
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