Jacobi shapes and clustering effects in light nuclei
报 告 人：Dr. Balaram Dey （Bankura University, West Bengal, India）
报告简介：The Jacobi shape transition, an abrupt change of shape from non-collective oblate to collective triaxial or prolate shape above a critical spin in nuclei, is also expected to occur in a nucleus while this was initially thought of in connection with rotating gravitational objects. These type shape transition has been observed earlier in 45Sc, 46Ti, 47V nuclei etc. Recently, for the first time, we observed the Jacobi shape transition in very light mass nucleus 31P using high energy gamma rays from the decay of giant dipole resonance (GDR) as a probe. In addition, a self-conjugate α-cluster nucleus 28Si was populated at similar initial excitation energy and angular momentum, which exhibits a vastly different GDR lineshape. Considering the present results for 28Si and similar observation recently reported in 32S, it is proposed that the nuclear orbiting phenomenon exhibited by α-cluster nuclei hinders the Jacobi shape transition. The present experimental results suggest a possibility to investigate the Exotic Nuclear Shape due to Cluster Formation at High Angular Momentum and high temperature using the GDR as a probe.
报告人简介：Dr. Balaram Dey graduated from University of Burdwan University of India in 2007 with bachelor degree in physics. He obtained doctoral degree in nuclear physics from Variable Energy Cyclotron Centre of India in 2015. He worked as Visiting Fellow in Tata Institute of Fundamental Research, Mumbai, India, from Oct 2015 to Sep 2017. Then he worked as DST-SERB NPDF Fellow in Saha Institute of Nuclear Physics, Kolkata, India, from Oct 2017 to Jul 2019. Then Dr. Balaram Dey joins Bankura University, as an Assistant Professor of Physics department.