61 research outputs found

    CARACTERISATION D'UN LASER Nd : YAG CONTINU A MODES COUPLES

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    Deformation of the N=Z nucleus 76Sr using beta-decay studies

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    A novel method of deducing the deformation of the N=Z nucleus 76Sr is presented. It is based on the comparison of the experimental Gamow-Teller strength distribution B(GT) from its beta decay with the results of QRPA calculations. This method confirms previous indications of the strong prolate deformation of this nucleus in a totally independent way. The measurement has been carried out with a large Total Absorption gamma Spectrometer, "Lucrecia", newly installed at CERN-ISOLDE.Comment: Accepted in Phys. Rev. Letter

    Spectroscopy of 34,35Si^{34,35}Si by ÎČ\beta decay: sd-fp shell gap and single-particle states

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    The 34,35AlÎČ^{34,35}Al\beta decays were studied at the CERN on-line mass separator ISOLDE by ÎČ−γ,ÎČ−γ−γ\beta-\gamma, \beta-\gamma-\gamma and ÎČ−n−γ\beta-n-\gamma measurements, in order to corroborate thelow-level description of 34Si^{34}Si and to obtain the first information on the level structure of the N=21 isotope 35Si^{35}Si. Earlier observed Îł\gamma lines in 34Al^{34} Al decay were confirmed and new gamma transitions following both beta decay and ÎČ\beta-delayed neutron emission were established. The first level scheme in 35Si^{35}Si, including three excited states at 910, 974 and 2168 keV, is consistent with Jπ=3/2−J^{\pi} =3/2^{-} and 3/2+3/2^{+} for the first two states respectively. Beta-decay half-life of T1/2=38.6(4)T_{1/2} = 38.6 (4) ms and beta-delayed neutron branching PnP_{n} value (Pn=41(13)(P_{n} =41(13) %) were measured unambiguously. The significance of the single-particle energy determination at N=21, Z=14, for assessing the effective interaction in sd-fp shell-model calculations, is discussed and illustrated by predictions for different n-rich isotopes

    Beta-decay in odd-A and even-even proton-rich Kr isotopes

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    Beta-decay properties of proton-rich odd-A and even-even Krypton isotopes are studied in the framework of a deformed selfconsistent Hartree-Fock calculation with density-dependent Skyrme forces, including pairing correlations between like nucleons in BCS approximation. Residual spin-isospin interactions are consistently included in the particle-hole and particle-particle channels and treated in Quasiparticle Random Phase Approximation. The similarities and differences in the treatment of even-even and odd-A nuclei are stressed. Comparison to available experimental information is done for Gamow-Teller strength distributions, summed strengths, and half-lives. The dependence of these observables on deformation is particularly emphasized in a search for signatures of the shape of the parent nucleus.Comment: 29 pages, 16 figure

    The delayed proton emission in the A≃65-77 mass region, statistical aspects and structure effects

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    In the decay of the series of T sub Z =1/2 nuclei, sup 6 sup 5 Ge, sup 6 sup 9 Se, sup 7 sup 3 Kr and sup 7 sup 7 Sr, a statistical analysis was applied to the beta delayed proton emission to obtain nuclear structure information. New results emerge from this study, in the light of improvements in the experimental techniques and developments of the analysis method. Experimental results are analysed by comparison with a statistical model, in order to extract information on level densities and partial transition widths of the proton emitting nuclei. Limitations of the existing descriptions of processes for nuclei far from stability are pointed out

    Layered metal (II) and silico-phosphonates with ion exchange properties

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