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.

arXiv comment12 Pages, 5 Figures, Accepted for publication as Rapid Communication in Phys. Rev. C

References in corpus (13)

• Binary Decay of Light Nuclear Systems
• ${}^{16}\mathrm{O}{+}^{16}\mathrm{O}$ nature of the superdeformed band of ${}^{32}\mathrm{S}$ and the evolution of the molecular structure
• Evidence for the Jacobi shape transition in hot 46Ti
• LAMBDA: Large Area Modular BaF2 Detector Array for the measurement of high energy gamma rays
• Binary reaction decays from 24Mg+12C
• Survival of orbiting in ${}^{20}$Ne (7 - 10 MeV/nucleon) + ${}^{12}$C reactions
• Giant dipole resonance with exact treatment of thermal fluctuations
• Fission decay of N = Z nuclei at high angular momentum: ${}^{60}$Zn
• Giant-dipole Resonance and the Deformation of Hot, Rotating Nuclei
• 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 (17)

• Giant Dipole Resonance as a Fingerprint of $\alpha$ Clustering Configurations in ${}^{12}$C and ${}^{16}$O
• Critical behavior in the variation of GDR width at low temperature
• Dipole oscillation modes in light $\alpha$-clustering nuclei
• Probing the critical behavior in the evolution of GDR width at very low temperatures in A~100 mass region
• Measurement of Giant Dipole Resonance width at low temperature: A new experimental perspective
• Cluster formations in deformed states for ${}^{28}$Si and ${}^{32}$S
• Giant dipole resonance width as a probe for nuclear deformation at finite excitation
• Deformation in 28Si* produced via 16O + 12C reaction
• Clusters in Light Nuclei
• Search for Jacobi shape transition in A $\sim 30$ nuclei
• Present status of nuclear cluster physics and experimental perspectives
• Recent Experimental Results on Nuclear Cluster Physics
• Examination of level density prescriptions in the interpretation of high energy gamma-ray spectra
• Signature of clustering in quantum many body systems probed by the giant dipole resonance
• Clustering effects induced by light nuclei
• Neutron response of the LAMBDA spectrometer and neutron interaction length in BaF2
• Molecular structures and clustering effects in reactions induced by light nuclei