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



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Fraile Prieto, Luis Mario and Beceiro Novo, S: (2017) Ground-state configuration of neutron-rich ³⁵Al via Coulomb breakup. Physical review C, 96 (3). ISSN 2469-9985

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The ground-state configuration of ³⁵Al 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 ³⁵Al, integrated up to 5.0 MeV relative energy between the ³³Al core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of ³³Al is 29(7) mb. The differential CD cross section of ³⁵Al -> ³⁴Al + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of ³⁵Al could be, tentatively, 1/2⁺ or 3/2⁺ or 5/2⁺. The valence neutrons, in the ground state of ³⁵Al, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the ³⁴Al 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 ³⁵Al as suggested in the literature, then the major ground-state configuration of ³⁵Al is a combination of ³⁴Al (g. s.; 4⁻) circle times ν_(p_(3/2)) and ³⁴Al (isomer; 1⁺) circle times ν _(d_(3/2)) states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.

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©2017 American Physical Society.
Artículo firmado por mas de diez autores.
The authors are thankful to the accelerator staff of GSI for their support during the experiment. The authors are also thankful to Prof. Ajit Mahanty, SINP, Kolkata for critically reviewing the manuscript and providing valuable suggestions. Author Ushasi Datta gratefully acknowledges the Alexander von Humboldt (AvH) foundation for financial support to execute the project of exploring disappearance of the “magic numbers” in exotic nuclei. This work is a part of that Project. This work has been partially funded by the XIth plan, SEND Project (PIN:11-R&D-SIN-5.11-0400), DAE, Government of India

Uncontrolled Keywords:N=20 Shell closure; Mass measurements; Nuclei; Isotopes; Excitation; Collisions; Inversion; Emission; Island; Ions
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
Sciences > Physics > Nuclear physics
ID Code:46169
Deposited On:30 Jan 2018 08:07
Last Modified:10 Dec 2018 14:57

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