Ground-state configuration of neutron-rich <SUP>35</SUP>Al via Coulomb breakup

Chakraborty, S, Datta, Ushasi, Aumann, T, Beceiro-Novo, S, Boretzky, K, Caesar, C, Carlson, BV, Catford, WN, Chartier, M, Cortina-Gil, D
et al (show 38 more authors) (2017) Ground-state configuration of neutron-rich <SUP>35</SUP>Al via Coulomb breakup. PHYSICAL REVIEW C, 96 (3). 034301-.

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The ground-state configuration of Al35 has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of ∼403 MeV/nucleon. The measured inclusive differential CD cross section for Al35, integrated up to 5.0 MeV relative energy between the Al34 core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of Al34 is 29(7) mb. The differential CD cross section of Al35→Al34+n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of Al35 could be, tentatively, 1/2+ or 3/2+ or 5/2+. The valence neutrons, in the ground state of Al35, may occupy a combination of either l=3,0 or l=1,2 orbitals coupled with the Al34 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 Al35 as suggested in the literature, then the major ground-state configuration of Al35 is a combination of Al34(g.s.;4-) - νp3/2 and Al34(isomer;1+) - νd3/2 states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 05 Feb 2020 10:16
Last Modified: 20 Jun 2024 19:08
DOI: 10.1103/PhysRevC.96.034301
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