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3 results on '"Shell migration"'

1. Shell evolution approaching the N=20 island of inversion: Structure of 26Na

Author

G.L. Wilson, W.N. Catford, N.A. Orr, C.Aa. Diget, A. Matta, G. Hackman, S.J. Williams, I.C. Celik, N.L. Achouri, H. Al Falou, R. Ashley, R.A.E. Austin, G.C. Ball, J.C. Blackmon, A.J. Boston, H.C. Boston, S.M. Brown, D.S. Cross, M. Djongolov, T.E. Drake, U. Hager, S.P. Fox, B.R. Fulton, N. Galinski, A.B. Garnsworthy, D. Jamieson, R. Kanungo, K.G. Leach, J.N. Orce, C.J. Pearson, M. Porter-Peden, F. Sarazin, E.C. Simpson, S. Sjue, D. Smalley, C. Sumithrarachchi, S. Triambak, C. Unsworth, and R. Wadsworth

Subjects
81V35, Nuclear structure, 26Na, γ-Ray transitions, Transfer reactions, Shell migration, Physics, QC1-999
Abstract

The levels in 26Na with single particle character have been observed for the first time using the d(25Na, pγ) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with (0+1)ħω shell model calculations performed in a complete spsdfp basis and incorporating a reduction in the N=20 gap. Notably, the 1p3/2 neutron configuration was found to play an enhanced role in the structure of the low-lying negative parity states in 26Na, compared to the isotone 28Al. Thus, the lowering of the 1p3/2 orbital relative to the 0f7/2 occurring in the neighbouring Z=10 and 12 nuclei – 25,27Ne and 27,29Mg – is seen also to occur at Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion.

Published
2016
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2. Shell evolution approaching the N = 20 island of inversion: Structure of 26Na.

Author

Wilson, G.L., Catford, W.N., Orr, N.A., Diget, C.Aa., Matta, A., Hackman, G., Williams, S.J., Celik, I.C., Achouri, N.L., Al Falou, H., Ashley, R., Austin, R.A.E., Ball, G.C., Blackmon, J.C., Boston, A.J., Boston, H.C., Brown, S.M., Cross, D.S., Djongolov, M., and Drake, T.E.

Subjects
*NUCLEAR shell theory, *RADIOISOTOPES, *PARTICLES (Nuclear physics), *NUCLEAR reactions, *RADIATIVE transitions, *NUCLEAR physics
Abstract

The levels in 26 Na with single particle character have been observed for the first time using the d( 25 Na, p γ ) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with ( 0 + 1 ) ħ ω shell model calculations performed in a complete s p s d f p basis and incorporating a reduction in the N = 20 gap . Notably, the 1 p 3 / 2 neutron configuration was found to play an enhanced role in the structure of the low-lying negative parity states in 26 Na, compared to the isotone 28 Al. Thus, the lowering of the 1 p 3 / 2 orbital relative to the 0 f 7 / 2 occurring in the neighbouring Z = 10 and 12 nuclei – 25,27 Ne and 27,29 Mg – is seen also to occur at Z = 11 and further strengthens the constraints on the modelling of the transition into the island of inversion. [ABSTRACT FROM AUTHOR]

Published
2016
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3. Shell evolution approaching the N=20 island of inversion: Structure of 26Na

Author

Simpson, E.C., Porter-Peden, M., Wilson, G.L., Catford, W.N., Orr, N.A., Diget, C.Aa., Matta, A., Hackman, G., Williams, S.J., Celik, I.C., Achouri, N.L., Al Falou, H., Ashley, R., Austin, R.A.E., Ball, G.C., Pearson, C.J., Blackmon, J.C., Boston, A.J., Smalley, D., Sjue, S., Orce, J.N., Sarazin, F., Fulton, B.R., Galinski, N., Wadsworth, R., Unsworth, C., Triambak, S., Sumithrarachchi, C., Garnsworthy, A.B., Jamieson, D., Kanungo, R., Leach, K., Fox, S.P., Hager, U., Drake, T.E., Djongolov, M., Cross, D.S., Brown, S.M., Boston, H.C., Leach, K.G., Falou, H., Catford, W., Svensson, C., Simpson, E., Pearson, C., Orce, J., Garnsworthy, A., Fulton, B., Fox, S., Drake, T., Cross, D., Brown, S., Boston, H., Boston, A., Blackmon, J., Ball, G., Austin, R., Achouri, N., Celik, I., Williams, S., Diget, C., Orr, N., Wilson, G., Department of Physics, University of Surrey, Guildford, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), University of York [York, UK], TRIUMF [Vancouver], St mary's University, St Mary's University, Department of Physics and Astronomy [Baton Rouge], Louisiana State University (LSU), Department of Physics - University of Liverpool, University of Liverpool, Department of Physics [Toronto], University of Toronto, Department of Physics [Guelph], University of Guelph, iThemba LABS, Somerset West, and National Research Foundation of South Africa

Subjects
Nuclear and High Energy Physics, SHELL model, FOS: Physical sciences, 26Na, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Transfer reactions, 0103 physical sciences, Neutron, Nuclear structure, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Island of inversion, Isotone, Shell migration, Parity (physics), 81V35, lcsh:QC1-999, Atomic physics, Nucleon, γ-Ray transitions, Excitation, lcsh:Physics
Abstract

The levels in 26Na with single particle character have been observed for the first time using the d(25Na,p gamma) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with (0+1) hbar-omega shell model calculations performed in a complete spsdfp basis and incorporating a reduction in the N=20 gap. Notably, the 1p3/2 neutron configuration was found to play an enhanced role in the structure of the low-lying negative parity states in 26Na, compared to the isotone 28Al. Thus, the lowering of the 1p3/2 orbital relative to the 0f7/2 occurring in the neighbouring Z=10 and 12 nuclei -- 25,27Ne and 27,29Mg -- is seen also to occur at Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion., 6 figures

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