Abstract
Lifetimes of excited states in the Kπ = 0− octupole band and γ-vibrational of 228Th have been measured using the fast timing setup at the University of the West of Scotland (UWS). The setup consists of two cerium doped LaBr3 fast scintillators placed equidistant from the radioactive source 232Th. The states of interest have been analysed by doing the triple γ – γ – time coincidence analysis and using the fast-timing technique, mirror-symmetric centroid difference method. Octupole collectivity in 228Th nucleus is also investigated by calculating the enhanced electric dipole moments and transition rates in excited states followed by lifetime measurements in octupole band.
Highlights
Lifetime measurements of nuclear excited states is important in defining the observables like intrinsic dipole moments and transition rates in order to explain the nuclear structure [1][2][3]
Experimental setup: The experiment was performed at University of the West of Scotland by keeping the radioactive source, 232Th foil with radioactivity ≈ 6 kBq, at equidistant (d=5mm) from two 1 × 1 LaBr3(Ce) detectors
The setup works on the principle of mirror symmetric centroid difference method [4, 5, 6] where delayed and anti-delayed time distributions are obtained by selecting the populating and depopulating transitions as start and stop signals respectively and vice versa
Summary
Lifetime measurements of nuclear excited states is important in defining the observables like intrinsic dipole moments and transition rates in order to explain the nuclear structure [1][2][3]. Such measurements have been done using different methods and types of detectors. Much of theoretical work have been done to investigate the octupole collectivity in actindes including the Th isotopes [7] [8][9][10][11][12].
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