Speaker
Description
Level lifetime measurements play a crucial role in nuclear structure studies, enabling the identification of isomers and providing insights into various excitation phenomena in nuclei. The Digital INGA setup at TIFR [1] has been enhanced with an array of LaBr3(Ce) scintillator detectors and a Si–CD detector. Using this setup, fast-timing measurements have been performed to investigate the evolution of octupole collectivity in La and Zr isotopes [2,3]. In addition, Coulomb excitation experiments have recently been carried out to further explore octupole collectivity in Zr isotopes [4]. In another experiment, lifetime measurements employing the Doppler Shift Attenuation Method (DSAM) in 88Sr have, for the first time, confirmed the existence of an attractive shears interaction between two particle blades in any nucleus [5]. Selected results from these experiments, addressing diverse aspects of nuclear structure near the neutron shell gaps at N=50 and N=82, will be presented.
References:
[1] R. Palit et al., European Physical Journal A 61, 74 (2025).
[2] Md. S. R. Laskar et al. Phys. Rev. C 104, L011301 (2021).
[3] P. Dey et al., Nucl. Phys. A 1057 123035 (2025).
[4] P. Dey et al., (in preparation).
[5] B. Das et al., Phys. Lett. B 862, 139324 (2025).
Acknowledgements:
Author is thankful to all the members of the INGA collaboration, the staff members at TIFR-BARC Pelletron Linac Facility, Central workshop and Low Temperature Facility of TIFR. This work is supported by the Department of Atomic Energy, Government of India (Project Identification No. RTI 4002), and the Department of Science and Technology, Government of India (Grant No. IR/S2/PF-03/2003-II).