Search for Spontaneous Radiation from Wave Function Collapse in the MAJORANA DEMONSTRATOR
Search for Spontaneous Radiation from Wave Function Collapse in the MAJORANA DEMONSTRATOR
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DOI：
10.1103/physrevlett.129.080401
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发表时间：
2022-08-16
影响因子：
8.6
通讯作者：
Zhu, B. X.
中科院分区：
文献类型：
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作者：
Arnquist, I. J.;Avignone, F. T., III;Zhu, B. X.
Majorana示范器无中微子双β衰变实验包括一个44公斤(30公斤在Ge-76中浓缩)的p型点接触锗探测器阵列。凭借其史无前例的能量分辨率和超低背景，Majorana还在100keV以下的低能区域寻找来自标准模型物理之外的罕见事件特征。在这封信中，我们测试了连续自发局域化(CSL)模型，这是一种数学上有良好动机的波函数坍塌模型，旨在解决长期悬而未决的量子力学测量问题。虽然CSL预测在X射线领域存在可检测到的辐射特征，但我们在2015年12月31日至2019年11月27日与演示者一起收集的37.5公斤/年的富集锗暴露中，没有发现19-100keV范围内存在此类辐射的证据。我们用两种不同的假设探索了CSL的非质量比例(n-m-p)和质量比例(m-p)版本：只有准自由电子才能发射x射线辐射，而原子核可以相干地发射放大的辐射。在所有情况下，我们都为白色CSL模型设置了迄今为止最严格的崩溃速率上限，与可比搜索相比，敏感度提高了40-100倍。对于所允许的参数空间的大部分，我们的限制是最严格的。如果用Diosi-Penrose引力波函数坍塌模型来解释这一结果，95%置信度的下限几乎比以前的最佳下限提高了一个数量级。
The MAJORANA DEMONSTRATOR neutrinoless double-beta decay experiment comprises a 44 kg (30 kg enriched in Ge-76) array of p-type, point-contact germanium detectors. With its unprecedented energy resolution and ultralow backgrounds, MAJORANA also searches for rare event signatures from beyond standard model physics in the low energy region below 100 keV. In this Letter, we test the continuous spontaneous localization (CSL) model, one of the mathematically well-motivated wave function collapse models aimed at solving the long-standing unresolved quantum mechanical measurement problem. While the CSL predicts the existence of a detectable radiation signature in the x-ray domain, we find no evidence of such radiation in the 19-100 keV range in a 37.5 kg-y enriched germanium exposure collected between December 31, 2015, and November 27, 2019, with the DEMONSTRATOR. We explored both the non-massproportional (n-m-p) and the mass-proportional (m-p) versions of the CSL with two different assumptions: that only the quasifree electrons can emit the x-ray radiation and that the nucleus can coherently emit an amplified radiation. In all cases, we set the most stringent upper limit to date for the white CSL model on the collapse rate,., providing a factor of 40-100 improvement in sensitivity over comparable searches. Our limit is the most stringent for large parts of the allowed parameter space. If the result is interpreted in terms of the Diosi-Penrose gravitational wave function collapse model, the lower bound with a 95% confidence level is almost an order of magnitude improvement over the previous best limit.