https://doi.org/10.1051/epjconf/202532901010
Fast-timing spectroscopy with the ν-ball2 spectrometer
1 School of Mathematics and Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
2 National Institute for Physics and Nuclear Engineering, R-77125 Bucharest-Magurele, Romania
3 Université Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
4 National Physical Laboratory, Teddington TW11 0LW, United Kingdom
5 Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, 64289, Darmstadt, Germany
* e-mail: s.pascu@surrey.ac.uk
Published online: 25 June 2025
The fast-timing method has been used in a high-statistics experiment at ALTO@IJCLab to perform lifetime measurements of excited states in exotic nuclei. These observables and their corresponding transition probabilities are key fingerprints for the structure of atomic nuclei, as they are sensitive to small components of the wave function. Neutron-rich nuclei have been populated in a two-step fission-induced experiment. In the first stage, the neutron beam was produced by the LICORNE source in an inverse kinematics reaction with a pulsed 7Li beam delivered by the Tandem accelerator, incident on an H2 gas cell. The resulting neutron beam with an average energy of about 2 MeV was used in a second step to induce fissions on the 238U secondary target. The hybrid high-efficiency v-ball2 array comprising 24 clover detectors and 20 UK FATIMA LaBr3(Ce) scintillators was used to detect the emitted gamma rays. Improvements are discussed in comparison to the previous v-ball1 campaign and preliminary results of the current experiment are presented.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
