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Ground-state configuration of neutron-rich Al-35 via Coulomb breakup

S. Chakraborty ; U. Datta ; T. Aumann ; S. Beceiro-Novo ; K. Boretzky ; C. Caesar ; B. V. Carlson ; W. N. Catford ; M. Chartier ; D. Cortina-Gil ; G. de Angelis ; Paloma Diaz Fernandez (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; H. Emling ; O. Ershova ; L. M. Fraile ; H. Geissel ; D. Gonzalez-Diaz ; Håkan T. Johansson (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; Björn Jonson (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; N. Kalantar-Nayestanaki ; T. Kroll ; R. Kruecken ; C. Langer ; T. Le Bleis ; Y. Leifels ; J. Marganiec ; G. Munzenberg ; M. A. Najafi ; Thomas Nilsson (Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)) ; C. Nociforo ; V. Panin ; R. Plag ; A. Rahaman ; R. Reifarth ; M. V. Ricciardi ; C. Rigollet ; D. Rossi ; C. Scheidenberger ; H. Scheit ; H. Simon ; J. T. Taylor ; Y. Togano ; S. Typel ; Y. Utsuno ; A. Wagner ; F. Wamers ; H. Weick ; J. S. Winfield
Physical Review C (2469-9985). Vol. 96 (2017), 3, p. 1965.
[Artikel, refereegranskad vetenskaplig]

The ground-state configuration of Al-35 has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of similar to 403 MeV/nucleon. The measured inclusive differential CD cross section for Al-35, integrated up to 5.0 MeV relative energy between the Al-34 core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of 34Al is 29(7) mb. The differential CD cross section of Al-35 -> Al-34 + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of Al-35 could be, tentatively, 1/2+ or 3/2(+) or 5/2(+). The valence neutrons, in the ground state of Al-35, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the Al-34 core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at N = 20,28 which suggests narrowing the magic shell gap. If the 5/2+ is the ground-state spin-parity of Al-35 as suggested in the literature, then the major ground-state configuration of Al-35 is a combination of Al-34(g. s.; 4(-)) circle times upsilon(p3/2) and Al-34(isomer; 1(+)) circle times upsilon(d3/2) states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.

Nyckelord: N=20 Shell Closure, Mass Measurements, Nuclei, Isotopes, Excitation, Collisions, Inversion, Emission, Island, Ions

Denna post skapades 2017-09-25.
CPL Pubid: 252052


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Institutionen för fysik, Subatomär fysik och plasmafysik (Chalmers)



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