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arXiv 0908.3433nucl-exnucl-thphysics.geo-ph
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地球中微子研究的核物理学

Nuclear physics for geo-neutrino studies

Gianni Fiorentini, Aldo Ianni, George Korga, Marcello Lissia, Fabio Mantovani, Lino Miramonti, Lothar Oberauer, Michel Obolensky, Oleg Smirnov, Yury Suvorov

摘要:

地中微子研究是基于地中微子光谱的理论估计。我们提出了一种直接测量长寿命放射性同位素衰变产生的反中微子能量分布的方法。我们提出了初步的结果,从Bi-214衰变,一个过程,约占总的地球中微子信号的一半。在普适中微子谱形状(UNSS)假设下,得到了Bi-214最低态的馈送几率为p0 = 0.177 \pm 0.004(stat)^{+0.003}-0.001}(sys)。该值与同位素表(ToI)的(间接)估计值一致。我们表明,可实现的更大的统计和减少系统学应该允许测试可能的中微子光谱扭曲使用UNSS假设的预测。地球中微子信号的影响进行了讨论。

英文摘要:

Geo-neutrino studies are based on theoretical estimates of geo-neutrino spectra. We propose a method for a direct measurement of the energy distribution of antineutrinos from decays of long-lived radioactive isotopes. We present preliminary results for the geo-neutrinos from Bi-214 decay, a process which accounts for about one half of the total geo-neutrino signal. The feeding probability of the lowest state of Bi-214 - the most important for geo-neutrino signal - is found to be p_0 = 0.177 \pm 0.004 (stat) ^{+0.003}_{-0.001} (sys), under the hypothesis of Universal Neutrino Spectrum Shape (UNSS). This value is consistent with the (indirect) estimate of the Table of Isotopes (ToI). We show that achievable larger statistics and reduction of systematics should allow to test possible distortions of the neutrino spectrum from that predicted using the UNSS hypothesis. Implications on the geo-neutrino signal are discussed.

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