Digital pile-up rejection for plutonium experiments with solution-grown stilbene

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• 作者：M.M. Bournep> ; p>p>mmbourne@umich.edup> ; S.D. Clarke p>clarkesd@umich.edup> ; M. Paff p>mpaff@umich.edup> ; A. DiFulvio p>difulvio@umich.edup> ; M. Norsworthy p>marknors@umich.edup> ; S.A. Pozzi p>pozzisa@umich.edup>
• 关键词：Stilbene scintillator ; Plutonium experiments ; MCNP ; MCNPX-PoliMi
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：11 January 2017
• 年：2017
• 卷：842
• 期：Complete
• 页码：1-6
• 全文大小：684 K
• 卷排序：842

文摘

A solution-grown stilbene detector was used in several experiments with plutonium samples including plutonium oxide, mixed oxide, and plutonium metal samples. Neutrons from different reactions and plutonium isotopes are accompanied by numerous gamma rays especially by the 59-keV gamma ray of 241Am. Identifying neutrons correctly is important for nuclear nonproliferation applications and makes neutron/gamma discrimination and pile-up rejection necessary. Each experimental dataset is presented with and without pile-up filtering using a previously developed algorithm. The experiments were simulated using MCNPX-PoliMi, a Monte Carlo code designed to accurately model scintillation detector response. Collision output from MCNPX-PoliMi was processed using the specialized MPPost post-processing code to convert neutron energy depositions event-by-event into light pulses. The model was compared to experimental data after pulse-shape discrimination identified waveforms as gamma ray or neutron interactions. We show that the use of the digital pile-up rejection algorithm allows for accurate neutron counting with stilbene to within 2% even when not using lead shielding.