Conceptual design of a hybrid neutron-gamma detector for study of β-delayed neutrons at the RIB facility of RIKEN

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Tarifeno-Saldivia, A, Tain, JL, Domingo-Pardo, C, Calvino, F, Cortes, G, Phong, VH, Riego, A, Agramunt, J, Algora, A, Brewer, N et al (show 34 more authors) , Caballero-Folch, R, Coleman-Smith, PJ, Davinson, T, Dillmann, I, Estrade, A, Griffin, CJ, Grzywacz, R, Harkness-Brennan, LJ, Kiss, GG, Kogimtzis, M, Labiche, M, Lazarus, IH, Lorusso, G, Matsui, K, Miernik, K, Montes, F, Morales, AI, Nishimura, S, Page, RD, Podolyak, ZS, Pucknell, VFE, Rasco, BC, Regan, P, Rubio, B, Rykaczewski, KP, Saito, Y, Sakurai, H, Simpson, J, Sokol, E, Surman, R, Svirkhin, A, Thomas, SL, Tolosa, A and Woods, P (2017) Conceptual design of a hybrid neutron-gamma detector for study of β-delayed neutrons at the RIB facility of RIKEN. JOURNAL OF INSTRUMENTATION, 12 (04). P04006-P04006.

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Abstract

The conceptual design of the BRIKEN neutron detector at the radioactive ion beam factory (RIBF) of the RIKEN Nishina Center is reported. The BRIKEN setup is a complex system aimed at detecting heavy-ion implants, β particles, γ rays and β-delayed neutrons. The whole setup includes the Advanced Implantation Detection Array (AIDA), two HPGe Clover detectors and up to 166 3He-filled counters embedded in a high-density polyethylene moderator. The design is quite complex due to the large number and different types of 3He-tubes involved and the additional constraints introduced by the ancillary detectors for charged particles and γ rays. This article reports on a novel methodology developed for the conceptual design and optimisation of the 3He-counter array, aiming for the best possible performance in terms of neutron detection. The algorithm is based on a geometric representation of two selected detector parameters of merit, namely, the average neutron detection efficiency and the efficiency flatness as a function of a reduced number of geometric variables. The response of the neutron detector is obtained from a systematic Monte Carlo simulation implemented in GEANT4. The robustness of the algorithm allowed us to design a versatile detection system, which operated in hybrid mode includes the full neutron counter and two clover detectors for high-precision gamma spectroscopy. In addition, the system can be reconfigured into a compact mode by removing the clover detectors and re-arranging the 3He tubes in order to maximize the neutron detection performance. Both operation modes shows a rather flat and high average efficiency. In summary, we have designed a system which shows an average efficiency for hybrid mode (3He tubes + clovers) of 68.6% and 64% for neutron energies up to 1 and 5 MeV, respectively. For compact mode (only 3He tubes), the average efficiency is 75.7% and 71% for neutron energies up to 1 and 5 MeV, respectively. The performance of the BRIKEN detection system has been also quantified by means of Monte Carlo simulations with different neutron energy distributions.

Item Type:	Article
Uncontrolled Keywords:	Detector modelling and simulations I (interaction of radiation with matter, interaction, of photons with matter, interaction of hadrons with matter, etc), Instrumentation for radioactive beams (fragmentation devices; fragment and isotope, separators incl. ISOL; isobar separators; ion and atom traps; weak-beam diagnostics; radioactive-beam ion sources), Neutron detectors (cold, thermal, fast neutrons)
Depositing User:	Symplectic Admin
Date Deposited:	02 Jun 2017 10:10
Last Modified:	12 Oct 2023 00:42
DOI:	10.1088/1748-0221/12/04/P04006
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3007789