High-resolution and low-background $$^{163}$$Ho spectrum: interpretation of the resonance tails
High-resolution and low-background $$^{163}$$Ho spectrum: interpretation of the resonance tails
复制标题
高分辨率和低背景 $$^{163}$$Ho 谱：共振尾部的解释
DOI：
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
K. Zuber
中科院分区：
文献类型：
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作者：
C. Velte;F. Ahrens;A. Barth;K. Blaum;M. Brass;M. Door;H. Dorrer;C. Düllmann;S. Eliseev;C. Enss;P. Filianin;A. Fleischmann;L. Gastaldo;A. Goeggelmann;T. D. Goodacre;M. Haverkort;D. Hengstler;J. Jochum;K. Johnston;M. Keller;S. Kempf;T. Kieck;C. König;U. Köster;K. Kromer;F. Mantegazzini;B. Marsh;Y. Novikov;F. Piquemal;C. Riccio;D. Richter;A. Rischka;S. Rothe;R. Schüssler;C. Schweiger;T. Stora;M. Wegner;K. Wendt;M. Zampaolo;K. Zuber
通过β和电子俘获谱的运动学分析确定有效电子中微子质量被认为是模型无关的，因为它依赖于能量和动量守恒。同时，期望频谱的精确描述超出了简单的相空间项。特别是对于电子捕获过程，多体电子-电子相互作用导致除了量热测量光谱中的主共振之外的附加结构。精确描述的$$^{163}$$Ho光谱是理解低强度结构在端点区域的影响，有限的中微子质量影响的形状最强烈的基础。我们提出了一个低背景和高能量分辨率的测量$$^{163}$$Ho光谱的ECHO实验的框架。我们研究了强度跨越三个数量级的主共振和多重峰的线形。我们讨论了需要引入一个不对称的线形状的贡献，由于Auger-Meitner衰变的状态以上的自动电离阈值。有了这一点，我们确定在端点区域的计数率的提高约为2倍，这反过来又导致在所需的曝光的实验，以实现给定的灵敏度上的有效电子中微子质量的相等减少。
The determination of the effective electron neutrino mass via kinematic analysis of beta and electron capture spectra is considered to be model-independent since it relies on energy and momentum conservation. At the same time the precise description of the expected spectrum goes beyond the simple phase space term. In particular for electron capture processes, many-body electron-electron interactions lead to additional structures besides the main resonances in calorimetrically measured spectra. A precise description of the $$^{163}$$Ho spectrum is fundamental for understanding the impact of low intensity structures at the endpoint region where a finite neutrino mass affects the shape most strongly. We present a low-background and high-energy resolution measurement of the $$^{163}$$Ho spectrum obtained in the framework of the ECHo experiment. We study the line shape of the main resonances and multiplets with intensities spanning three orders of magnitude. We discuss the need to introduce an asymmetric line shape contribution due to Auger–Meitner decay of states above the auto-ionisation threshold. With this we determine an enhancement of count rate at the endpoint region of about a factor of 2, which in turn leads to an equal reduction in the required exposure of the experiment to achieve a given sensitivity on the effective electron neutrino mass.
开发用于高精度测量 187Re 和 163Ho 光谱的金属磁性量热仪
影响因子：
2
作者：
Ranitzsch;P. C.-O;Schäfer;Hengstler
通讯作者：
Hengstler
影响因子：
3.1
作者：
Esfahani, A. Ashtari;Bansal, V.;Böser, S.;Buzinsky, N.;Cervantes, R.;Claessens, C.;de Viveiros, L.;Doe, P. J.;Fertl, M.;Formaggio, J. A.
通讯作者：
Formaggio, J. A.