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Direct experimental evidence for a multiparticle-hole ground state configuration of deformed Mg-33

U. Datta ; A. Rahaman ; T. Aumann ; S. Beceiro-Novo ; K. Boretzky ; C. Caesar ; B. V. Carlson ; W. N. Catford ; S. Chakraborty ; M. Chartier ; D. Cortina-Gil ; G. de Angelis ; P. D. Fernandez ; H. Emling ; O. Ershova ; L. M. Fraile ; H. Geissel ; D. Gonzalez-Diaz ; Björn Jonson (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Håkan T. Johansson (Institutionen för fysik, Subatomär fysik och plasmafysik, Experimentell subatomär fysik (Chalmers)) ; N. Kalantar-Nayestanaki ; T. Kroll ; R. Krucken ; J. Kurcewicz ; C. Langer ; T. Le Bleis ; Y. Leifels ; J. Marganiec ; G. Munzenberg ; M. A. Najafi ; Thomas Nilsson (Institutionen för fysik, Subatomär fysik och plasmafysik, Experimentell subatomär fysik (Chalmers)) ; C. Nociforo ; V. Panin ; S. Paschalis ; R. Plag ; R. Reifarth ; V. Ricciardi ; D. Rossi ; H. Scheit ; C. Scheidenberger ; H. Simon ; J. T. Taylor ; Y. Togano ; S. Typel ; V. Volkov ; A. Wagner ; F. Wamers ; H. Weick ; M. Weigand ; J. S. Winfield ; D. Yakorev ; M. Zoric
Physical Review C (2469-9985). Vol. 94 (2016), 3,
[Artikel, refereegranskad vetenskaplig]

The first direct experimental evidence of a multiparticle-hole ground state configuration of the neutron-rich Mg-33 isotope has been obtained via intermediate energy (400 A MeV) Coulomb dissociation measurement. The major part similar to(70 +/- 13)% of the cross section is observed to populate the excited states of Mg-32 after the Coulomb breakup of Mg-33. The shapes of the differential Coulomb dissociation cross sections in coincidence with different core excited states favor that the valence neutron occupies both the s(1/2) and p(3/2) orbitals. These experimental findings suggest a significant reduction and merging of sd-pf shell gaps at N similar to 20 and 28. The ground state configuration of Mg-33 is predominantly a combination of Mg-32(3.0,3.5MeV; 2(-), 1(-)) circle times nu(s1/2), Mg-32(2.5MeV; 2(+)) circle times nu(p3/2), and Mg-32(0; 0(+)) circle times nu(p3/2). The experimentally obtained quantitative spectroscopic information for the valence neutron occupation of the s and p orbitals, coupled with different core states, is in agreement with Monte Carlo shell model (MCSM) calculation using 3 MeV as the shell gap at N = 20.

Nyckelord: relativistic heavy-ions, neutron-rich isotopes, coulomb breakup, collisions, deformation, inversion, nuclei, island, halos



Denna post skapades 2016-10-14. Senast ändrad 2017-01-17.
CPL Pubid: 243405

 

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