Precise determination of quadrupole and hexadecapole deformation parameters of the sd-shell nucleus, 28Si

Quasi-elastic (QEL) scattering measurements have been performed using a 28Si projectile off a 90Zr target at energies around the Coulomb barrier. A Bayesian analysis within the framework of coupled channels (CC) calculations is performed in a large parameter space of quadrupole and hexadecapole defo...

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Bibliographic Details
Published in:	Physics letters. B Vol. 845; p. 138120
Main Authors:	Gupta, Y.K., Katariya, V.B., Prajapati, G.K., Hagino, K., Patel, D., Ranga, V., Garg, U., Danu, L.S., Pal, A., Joshi, B.N., Dubey, S., Desai, V.V., Panwar, S., Kumar, N., Mukhopadhyay, S., Singh, Pawan, Sirswal, N., Sariyal, R., Mazumdar, I., John, B.V.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 10-10-2023 Elsevier
Online Access:	Get full text
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Summary:	Quasi-elastic (QEL) scattering measurements have been performed using a 28Si projectile off a 90Zr target at energies around the Coulomb barrier. A Bayesian analysis within the framework of coupled channels (CC) calculations is performed in a large parameter space of quadrupole and hexadecapole deformations (β2 and β4) of 28Si. Our results unambiguously show that 28Si is an oblate shaped nucleus with β2=-0.38±0.01 which is in excellent agreement with results from electromagnetic probes. The sign and magnitude of quadrupole deformation along with a precise value of hexadecapole deformation (β4=+0.03±0.01) of 28Si have been determined for the first time using QEL scattering. A remarkable agreement is obtained between the experimental and calculated β4 values of 28Si based on Skyrme-Hartree-Fock method. The present results demonstrate the strong sensitivity of the quasi-elastic scattering to the sign and magnitude to the ground state deformation parameters, thus affirming its suitability to be used for rare exotic nuclei using low intensity RIBs.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2023.138120