Extreme nuclear shapes examined via Giant Dipole Resonance lineshapes in hot light mass system

Abstract

The influence of alpha clustering on nuclear reaction dynamics is investigated using the giant dipole resonance (GDR) lineshape studies in the reactions 20Ne (Elab=145,160 MeV) + 12C and 20Ne (Elab=160 MeV) + 27Al, populating 32S and 47V, respectively. The GDR lineshapes from the two systems are remarkably different from each other. Whereas, the non alpha-like 47V undergoes Jacobi shape transition and matches exceptionally well with the theoretical GDR lineshape estimated under the framework rotating liquid drop model (RLDM) and thermal shape fluctuation model (TSFM) signifying shape equilibration, for alpha cluster 32S an extended prolate kind of shape is observed. This unusual deformation, seen directly via -decay for the first time, is predicted to be due to the formation of orbiting di-nuclear configuration or molecular structure of 16O+ 16O in 32S superdeformed band.

12 Pages, 5 Figures, Accepted for publication as Rapid Communication in Phys. Rev. C

References in corpus (7)

• LAMBDA: Large Area Modular BaF2 Detector Array for the measurement of high energy gamma rays
• Binary reaction decays from 24Mg+12C
• Fission decay of N = Z nuclei at high angular momentum: ${}^{60}$Zn
• Giant Dipole Resonance Width in near-Sn Nuclei at Low Temperature and High Angular Momentum
• Evidence of large nuclear deformation of ${}^{32}$S${}^{\ast }$ formed in ${}^{20}$Ne + ${}^{12}$C reaction
• Deformation Effects in Hot Rotating 46Ti Probed by the Charged Particle Emission and GDR gamma-Decay
• Alpha-Cluster States Populated in 24Mg+12C

Cited by in corpus (6)

• Giant Dipole Resonance as a Fingerprint of $\alpha$ Clustering Configurations in ${}^{12}$C and ${}^{16}$O
• Cluster formations in deformed states for ${}^{28}$Si and ${}^{32}$S
• Deformation in 28Si* produced via 16O + 12C reaction
• Clusters in Light Nuclei
• Search for Jacobi shape transition in A $\sim 30$ nuclei
• Examination of level density prescriptions in the interpretation of high energy gamma-ray spectra