Sense and sensitivity of double beta decay experiments
Sense and sensitivity of double beta decay experiments
复制标题
双β衰变实验的意义和灵敏度
DOI：
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
A. Poves
中科院分区：
文献类型：
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作者：
J. J. Gómez;J. Martín;M. Sorel;P. Ferrario;F. Monrabal;J. Munoz;P. Novella;A. Poves
寻找无中子双β衰变是一个非常活跃的领域，在这个领域中，关于下一代实验的建议数量激增。在本文中，我们试图解决这类建议的意义和敏感性。灵敏度是第一位的，通过提出一个简单而明确的统计公式来推导出对假定的马约拉纳中微子质量m_bb的灵敏度。为了理解不同的实验方法是如何比较的，我们将此配方应用于选择的建议，比较结果的灵敏度。我们还提出了核矩阵元素的“物理激发范围”（PMR）作为不同核模型之间的统一标准。这些建议的预期性能仅用四个数字进行参数化：能量分辨率、背景速率（单位时间、同位素质量和能量）、探测效率和bb同位素质量。对于每个方案，都研究了实验性能的参考和乐观情况。在参考场景中，我们发现所有提案都能够部分探索简并谱，而不是完全覆盖它，尽管其中四个（KamLAND-Zen， CUORE， NEXT和EXO）将接近50 meV边界。在乐观的情况下，我们发现CUORE和基于氙的方案（KamLAND-Zen、EXO和NEXT）将探索反层次结构的很大一部分，而NEXT几乎完全覆盖了它。从长远来看，我们认为基于x的实验可能为1吨规模的实验提供最佳案例，因为可能实现的背景非常低，并且预期可扩展到大同位素质量。
The search for neutrinoless double beta decay is a very active field in which the number of proposals for next-generation experiments has proliferated. In this paper we attempt to address both the sense and the sensitivity of such proposals. Sensitivity comes first, by means of proposing a simple and unambiguous statistical recipe to derive the sensitivity to a putative Majorana neutrino mass, m_bb. In order to make sense of how the different experimental approaches compare, we apply this recipe to a selection of proposals, comparing the resulting sensitivities. We also propose a "physics-motivated range" (PMR) of the nuclear matrix elements as a unifying criterium between the different nuclear models. The expected performance of the proposals is parametrized in terms of only four numbers: energy resolution, background rate (per unit time, isotope mass and energy), detection efficiency, and bb isotope mass. For each proposal, both a reference and an optimistic scenario for the experimental performance are studied. In the reference scenario we find that all the proposals will be able to partially explore the degenerate spectrum, without fully covering it, although four of them (KamLAND-Zen, CUORE, NEXT and EXO) will approach the 50 meV boundary. In the optimistic scenario, we find that CUORE and the xenon-based proposals (KamLAND-Zen, EXO and NEXT) will explore a significant fraction of the inverse hierarchy, with NEXT covering it almost fully. For the long term future, we argue that Xe-based experiments may provide the best case for a 1-ton scale experiment, given the potentially very low backgrounds achievable and the expected scalability to large isotope masses.
NEMO 3 双 β 衰变实验中背景的测量
DOI：
10.1016/j.nima.2009.04.011
发表时间：
2009
期刊：
Accelerators, Spectrometers, Detectors and Associated Equipment
影响因子：
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作者：
Argyriades J
通讯作者：
Argyriades J