26 research outputs found

    Structure around the island of inversion with single-neutron knockout reactions at GANIL

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    CERN-Proceedings-2010-001 available at http://www.fluka.org/Varenna2009/procmat.htmInternational audienceThe nuclear structure of the 31Mg nucleus has been studied with the singleneutron knockout reaction. We report on the preliminary results of an experiment performed with the EXOGAM array coupled, for the first time, to the SPEG spectrometer at GANIL.We present a provisional result for the inclusive single-neutron knockout cross section of σinc= 90(5) mb. Preliminary exclusive cross sections for the measured bound states, including the ground state, are also presented. Finally, preliminary longitudinal momentum distributions for the ground state and first excited state are also shown. These results are compared to Monte Carlo Shell-Model calculations in the sd-pf region

    Re-examining the transition into the N=20 island of inversion: structure of 30Mg

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    Intermediate energy single-neutron removal from 31^{31}Mg has been employed to investigate the transition into the N=20 island of inversion. Levels up to 5~MeV excitation energy in 30^{30}Mg were populated and spin-parity assignments were inferred from the corresponding longitudinal momentum distributions and γ\gamma-ray decay scheme. Comparison with eikonal-model calculations also permitted spectroscopic factors to be deduced. Surprisingly, the 02+^{+}_{2} level in 30^{30}Mg was found to have a strength much weaker than expected in the conventional picture of a predominantly 2p−2h2p - 2h intruder configuration having a large overlap with the deformed 31^{31}Mg ground state. In addition, negative parity levels were identified for the first time in 30^{30}Mg, one of which is located at low excitation energy. The results are discussed in the light of shell-model calculations employing two newly developed approaches with markedly different descriptions of the structure of 30^{30}Mg. It is concluded that the cross-shell effects in the region of the island of inversion at Z=12 are considerably more complex than previously thought and that np−nhnp - nh configurations play a major role in the structure of 30^{30}Mg.Comment: Physics Letters B, Volume 779, 10 April 2018, Pages 124-12

    Criterios para las Relaciones de Edad de los Minerales con Especial Referencias a Cortes Pulidos de Minerales MetalĂ­feros

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    Fil: Bastin, E.S.Fil: Graton, L.C.Fil: Lindgren, W.Fil: Newhouse, W.H.Fil: Schwartz, G.M.Fil: Short, M.N.Traducido y condensado de Economic Geology T.XXVI 1931 por los doctores Natalia I. Rossi, Fernando L. Sesana y Jorge A. Valvano

    Structure around the island of inversion with single-neutron knockout reactions at GANIL

    No full text
    CERN-Proceedings-2010-001 available at http://www.fluka.org/Varenna2009/procmat.htmInternational audienceThe nuclear structure of the 31Mg nucleus has been studied with the singleneutron knockout reaction. We report on the preliminary results of an experiment performed with the EXOGAM array coupled, for the first time, to the SPEG spectrometer at GANIL.We present a provisional result for the inclusive single-neutron knockout cross section of σinc= 90(5) mb. Preliminary exclusive cross sections for the measured bound states, including the ground state, are also presented. Finally, preliminary longitudinal momentum distributions for the ground state and first excited state are also shown. These results are compared to Monte Carlo Shell-Model calculations in the sd-pf region
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