Analysis of γ-Ray Production in Neutral-Current Neutrino-Oxygen Interactions at Energies above 200 MeV
Analysis of γ-Ray Production in Neutral-Current Neutrino-Oxygen Interactions at Energies above 200 MeV
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DOI：
10.1103/physrevlett.108.052505
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发表时间：
2012-02-01
影响因子：
8.6
通讯作者：
Sakuda, Makoto
中科院分区：
文献类型：
--
作者：
Ankowski, Artur M.;Benhar, Omar;Sakuda, Makoto
人们早就认识到，可以利用对源自核去激发的伽马射线的观测来识别水-切伦科夫探测器中的中性流中微子-核相互作用。我们报告的结果的中微子和反中微子诱导的伽马射线生产截面的氧靶的计算。我们的分析集中在中微子能量大于类似200兆电子伏的运动学区域，其中单核子敲除是已知的占主导地位的反应机制。数值结果已获得第一次使用一个现实的目标光谱函数模型，广泛测试对电子核散射数据。我们发现，在中微子能量为600 MeV的中性流相互作用的比例，导致能量大于6 MeV的伽马射线的发射是类似的41%，和p（3/2）状态的贡献是压倒性的。
It has long been recognized that the observation of gamma rays originating from nuclear deexcitation can be exploited to identify neutral-current neutrino-nucleus interactions in water-Cherenkov detectors. We report the results of a calculation of the neutrino- and antineutrino-induced gamma-ray production cross section for the oxygen target. Our analysis is focused on the kinematical region of neutrino energy larger than similar to 200 MeV, in which a single-nucleon knockout is known to be the dominant reaction mechanism. The numerical results have been obtained using for the first time a realistic model of the target spectral function, extensively tested against electron-nucleus scattering data. We find that at a neutrino energy of 600 MeV the fraction of neutral-current interactions leading to emission of gamma rays of energy larger than 6 MeV is similar to 41%, and that the contribution of the p(3/2) state is overwhelming.