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

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10.1088/1748-0221/12/04/P04006
 
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Tarifeño Saldivia, Ariel EstebanMés informacióMés informació
Taín Enríquez, José LuisMés informació
Domingo Pardo, César
Calviño Tavares, FranciscoMés informacióMés informacióMés informació
Cortés Rossell, Guillem PereMés informacióMés informacióMés informació
Phong, V.H.
Riego Pérez, AlbertMés informacióMés informacióMés informació
Agramunt Ros, Jorge
Algora, A.
Document typeArticle
Defense date2017-04-07
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
ProjectESTUDIOS DE DESINTEGRACIONES BETA Y DE REACCIONES PARA LA ESTRUCTURA NUCLEAR, ASTROFISICA Y APLICACIONES (MINECO-FPA2014-52823-C2-2-P)
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, ß particles, ¿ rays and ß-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 ¿ 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.
CitationTarifeño, A., Taín, J.L., Domingo-Pardo, C., Calviño, F., Cortes, G., Phong, V., Riego, A., Agramunt, J., Algora, A. Conceptual design of a hybrid neutron-gamma detector for study of ß-delayed neutrons at the RIB facility of RIKEN. "Journal of instrumentation", 7 Abril 2017, vol. 12, núm. 4, p. P04006-1-P04006-21. 
URIhttp://hdl.handle.net/2117/105863
DOI10.1088/1748-0221/12/04/P04006
ISSN1748-0221
Publisher versionhttp://iopscience.iop.org/article/10.1088/1748-0221/12/04/P04006/meta;jsessionid=7471A60EA193FFF01E300D20C3697D59.c1.iopscience.cld.iop.org
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