RT Journal Article
T1 Re-examining the transition into the N = 20 island of inversion: Structure of 30Mg
A1 Fernández Domínguez, Beatriz
A1 Pietras, B.
A1 Catford, W. N.
A1 Orr, N. A.
A1 Petri, M.
A1 Chartier, M.
A1 Paschalis, S.
A1 Patterson, N.
A1 Thomas, J. S.
A1 Caamaño Fresco, Manuel
A1 Otsuka, T.
A1 Poves, A.
A1 Tsunoda, N.
A1 Achouri, N.L.
A1 Angélique, J. C.
A1 Ashwood, N. I.
A1 Banu, A.
A1 Bastin, B.
A1 Borcea, R.
A1 Brown, J.
A1 Delaunay, F.
A1 Franchoo, S.
A1 Freer, M.
A1 Gaudefroy, L.
A1 Heil, S.
A1 Labiche, M.
A1 Laurent, B.
A1 Lemmon, R. C.
A1 Macchiavelli, A .O.
A1 Negoita, F.
A1 Paul, E. S.
A1 Rodríguez Tajes, Carme
A1 Roussel Chomaz, P.
A1 Staniou, M.
A1 Taylor, M. J.
A1 Trache, L.
A1 Wilson, G. L.
AB Intermediate energy single-neutron removal from 31Mg has been employed to investigate the transition into the N=20island of inversion. Levels up to 5MeV excitation energy in 30Mg were populated and spin-parity assignments were inferred from the corresponding longitudinal momentum distributions and γ-ray decay scheme. Comparison with eikonal-model calculations also permitted spectroscopic factors to be deduced. Surprisingly, the 0+2level in 30Mg was found to have a strength much weaker than expected in the conventional picture of a predominantly 2p−2hintruder configuration having a large overlap with the deformed 31Mg ground state. In addition, negative parity levels were identified for the first time in 30Mg, 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 30Mg. It is concluded that the cross-shell effects in the region of the island of inversion at Z=12are considerably more complex than previously thought and that np−nhconfigurations play a major role in the structure of 30Mg.
PB Elsevier
SN 0370-2693
YR 2018
FD 2018
LK http://hdl.handle.net/10347/22803
UL http://hdl.handle.net/10347/22803
LA eng
NO Fernández-Domínguez, B., Pietras, B., Catford, W. N., Orr, N. A., Petri, M., Chartier, M., ... & Otsuka, T. (2018). Re-examining the transition into the N= 20 island of inversion: Structure of 30Mg. Physics Letters B, 779, 124-129
NO B.F.D. and M.C.F acknowledge financial support from the Ramón y Cajal programme RYC-2010-06484 and RYC-2012-11585 and from the Spanish MINECO grant No. FPA2015-71690-P. W.N. Catford acknowledges financial support from the STFC grant number ST/L005743/1. This work is partly supported by MINECO (Spain) grant FPA2014-57196 and Programme “Centros de Excelencia Severo Ochoa” SEV-2012-0249. The participants from the Universities of Birmingham, Liverpool, Surrey and CCLRC Daresbury, GSI and IFIN-HH laboratories also acknowledge partial support from the European Community within the FP6 contract EURONS RII3-CT-2004-06065
DS Minerva
RD 24 abr 2026