%0 Journal Article
%T Conceptual design of a hybrid neutron-gamma detector for study of beta-delayed neutrons at the RIB facility of RIKEN
%A BRIKEN Collaboration (Tarifeño-Saldivia, A. et al
%A Tain, J. L.
%A Domingo-Pardo, C.
%A Agramunt, J.
%A Algora, A.
%A Morales, A. I.
%A Rubio, B.
%A Tolosa, A.
%J Journal of Instrumentation
%D 2017
%V 12
%I Iop Publishing Ltd
%@ 1748-0221
%G English
%F BRIKENCollaborationTarifeno-Saldivia_etal2017
%O WOS:000405067800006
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3209), last updated on Tue, 13 Oct 2020 12:50:39 +0000
%X BRIKEN is a complex detection system to be installed at the RIB-facility of the RIKEN Nishina Center. It is aimed at the detection of heavy-ion implants, β-particles, γ-rays and β-delayed neutrons. The whole detection setup involves the Advanced Implantation Detection Array (AIDA), two HPGe Clover detectors and a large set of 166 counters of 3He embedded in a high-density polyethylene matrix. This article reports on a novel methodology developed for the conceptual design and optimisation of the 3He-tubes array, aiming at the best possible performance in terms of neutron detection. The algorithm is based on a geometric representation of two selected parameters of merit, namely, average neutron detection efficiency and efficiency flatness, as a function of a reduced number of geometric variables. The response of the detection system itself, for each configuration, is obtained from a systematic MC-simulation implemented realistically in Geant4. This approach has been found to be particularly useful. On the one hand, due to the different types and large number of 3He-tubes involved and, on the other hand, due to the additional constraints introduced by the ancillary detectors for charged particles and gamma-rays. Empowered by the robustness of the algorithm, we have been able to design a versatile detection system, which can be easily re-arranged into a compact mode in order to maximize the neutron detection performance, at the cost of the gamma-ray sensitivity. In summary, we have designed a system which shows, for neutron energies up to 1(5) MeV, a rather flat and high average efficiency of 68.6%(64%) and 75.7%(71%) for the hybrid and compact modes, respectively. The performance of the BRIKEN system has been also quantified realistically by means of MC-simulations made with different neutron energy distributions.
%K Detector modelling and simulations I (interaction of radiation with matter
%K interaction
%K of photons with matter
%K interaction of hadrons with matter
%K etc)
%K Instrumentation for radioactive beams (fragmentation devices
%K fragment and isotope
%K separators incl. ISOL
%K isobar separators
%K ion and atom traps
%K weak-beam diagnostics
%K radioactive-beam ion sources)
%K Neutron detectors (cold
%K thermal
%K fast neutrons)
%R 10.1088/1748-0221/12/04/P04006
%U http://arxiv.org/abs/1606.05544
%U https://doi.org/10.1088/1748-0221/12/04/P04006
%P P04006 - 22pp