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arXiv 1104.1335hep-phastro-ph.SRhep-exnucl-ex
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在液体扩散器中探测CNO太阳中微子的一步

A step toward CNO solar neutrinos detection in liquid scintillators

F. L. Villante, A. Ianni, F. Lombardi, G. Pagliaroli, F. Vissani

摘要:

超纯液体闪烁体探测器中CNO太阳中微子的探测受到Bislonium-210核产生的背景的限制,Bislonium-210核经历β衰变为钋-210,寿命约为7天。钋-210核不稳定,衰变寿命约为200天,释放出也可以检测到的α粒子。在这封信中,我们表明,Bi-210的背景,可以通过查看的时间演变的α衰变率的Po-210,提供的α粒子探测效率是稳定的数据采集期间和外部来源的Po-210可以忽略不计。可以在相对短的时间内获得足够的精度。例如,如果初始Po-210事件率为2000 cpd/100吨或更低,则Borexino类探测器可以在大约1年内开始从Bi-210背景中识别CNO中微子信号。

英文摘要:

The detection of CNO solar neutrinos in ultrapure liquid scintillator detectors is limited by the background produced by Bismuth-210 nuclei that undergo beta-decay to Polonium-210 with a lifetime equal to about 7 days. Polonium-210 nuclei are unstable and decay with a lifetime equal to about 200 days emitting alpha particles that can be also detected. In this letter, we show that the Bi-210 background can be determined by looking at the time evolution of alpha-decay rate of Po-210, provided that alpha particle detection efficiency is stable over the data acquisition period and external sources of Po-210 are negligible. A sufficient accuracy can be obtained in a relatively short time. As an example, if the initial Po-210 event rate is 2000 cpd/100 ton or lower, a Borexino-like detector could start discerning CNO neutrino signal from Bi-210 background in about 1 yr.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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