The MULTI spectrometer for measurement of beta-decay process in exotic nuclei

0557384 - ÚJF 2023 RIV FR eng C - Conference Paper (international conference)
Siváček, Ivan - Stukalov, S. S. - Sobolev, Yu. G. - Testov, D. - Smirnov, V. - Penionzhkevich, Y. E. - Zeinulla, Z.
The MULTI spectrometer for measurement of beta-decay process in exotic nuclei.
EPJ Web of Conferences. Vol. 253. Les Ulis: E D P Sciences, 2021, č. článku 01003. ISSN 2100-014X.
[Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications (ANIMMA). Prague (CZ), 21.06.2021-25.06.2021]
R&D Projects: GA MŠMT LTT18021
Institutional support: RVO:61389005
Keywords : Monte Carlo simulations * Phoswich detector * gamma-ray spectrometer * He-3 neutron counters
OECD category: Nuclear physics
https://doi.org/10.1051/epjconf/202125301003

The construction of the portable spectrometer, MULTI, is designed for the measurement of beta-gamma-neutron coincidences on beams of radioactive exotic nuclei. It will be used in measurements of the beta-decay process of neutron-rich nuclei with large Q(beta) values accessible in radioactive beams facilities. The experimental technique includes the measurement of the ratios between gamma-ray emission and multi-neutron emission, following beta-decay of radioactive nuclei implanted into an active target. The construction of a gamma-ray spectrometer based on high-volume CeBr3+NaI(Tl) phoswich scintillation detectors is introduced. Results of the measurements of its fundamental characteristics - total detection efficiency, peak efficiency and Compton suppression effect with a Co-60 source are presented. Design of the neutron counter array, consisting of 40 proportional counters filled with He-3 gas, was optimized with Monte Carlo simulations. Results were validated with a Cf-252 spectroscopic source, leading to expected detection efficiency of similar to 35% for neutrons with energy < 1MeV. Further development plans are discussed.
Permanent Link: http://hdl.handle.net/11104/0331421