The CLYC-6 and CLYC-7 response to γ-rays, fast and thermal neutrons

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• 作者：A. Giaz^a ; L. Pellegri^a ; F. Camera^a ; ^b ; ^{franco.camera@mi.infn.it" class="auth_mail" title="E-mail the corresponding author} ; N. Blasi^a ; S. Brambilla^a ; S. Ceruti^a ; ^b ; B. Million^a ; S. Riboldi^a ; ^b ; C. Cazzaniga^c ; ^d ; G. Gorini^c ; ^d ; M. Nocente^c ; ^d ; A. Pietropaolo^e ; M. Pillon^e ; M. Rebai^c ; M. Tardocchi^d
• 关键词：CLYC scintillator ; Neutron&ndash ; gamma discrimination ; Fast neutron measurements ; Gamma spectroscopy
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：21 February 2016
• 年：2016
• 卷：810
• 期：Complete
• 页码：132-139
• 全文大小：2507 K

文摘

The crystal Cs₂LiYCl₆:Ce (CLYC) is a very interesting scintillator material because of its good energy resolution and its capability to identify γ-rays and fast/thermal neutrons. The crystal Cs₂LiYCl₆:Ce contains ⁶Li and ³⁵Cl isotopes, therefore, it is possible to detect thermal neutrons through the reaction ⁶Li(n, α)t while ³⁵Cl ions allow to measure fast neutrons through the reactions ³⁵Cl(n, p)³⁵S and ³⁵Cl(n, α)³²P. In this work two CLYC 1″×1″ crystals were used: the first crystal, enriched with ⁶Li at 95% (CLYC-6) is ideal for thermal neutron measurements while the second one, enriched with ⁷Li at >99% (CLYC-7) is suitable for fast neutron measurements. The response of CLYC scintillators was measured with different PMT models: timing or spectroscopic, with borosilicate glass or quartz window. The energy resolution, the neutron-γ discrimination and the internal activity are discussed. The capability of CLYC scintillators to discriminate γ rays from neutrons was tested with both thermal and fast neutrons. The thermal neutrons were measured with both detectors, using an AmBe source. The measurements of fast neutrons were performed at the Frascati Neutron Generator facility (Italy) where a deuterium beam was accelerated on a deuterium or on a tritium target, providing neutrons of 2.5 MeV or 14.1 MeV, respectively. The different sensitivity to thermal and fast neutrons of a CLYC-6 and of a CLYC-7 was additionally studied.