基于铝的超导隧道结合传感器用于核反冲谱学
仪器与探测器
2026-05-14 v2
摘要
BeEST实验通过测量 Be implanted into 超导隧道结合 (STJ) 传感器中核反冲能量来搜索亚MeV次级中子。反冲谱受到放射性掺杂物与传感器材料之间相互作用的影响。因此，我们正在开发基于铝的STJ (Al-STJ) 作为现有铱设备 (Ta-STJ) 的替代方案，以探索如何将材料效应从次要物理信号中分离。制造了三代Al-STJ。第一代电极厚度类似于现有Ta-STJ。它们具有低灵敏度和降低分辨率，但成功用于测量 Be 核反冲谱。第二代迭代采用后侧刻蚀制造的薄SiN膜悬浮的STJ。这类器件具有低漏电流，但产量较低。最终一代未进行后侧刻蚀，Al-STJ采用更薄的电极和更薄的隧道屏障以增加信号幅度。这些器件在使用355 nm (~3.5 eV) 激光脉冲时，实现了50 eV 处2.96 eV FWHM 能量分辨率。这些结果表明Al-STJ是BeEST实验中用于系统材料研究的可行探测器。
引用
@article{arxiv.2510.07792,
title = {Aluminum-Based Superconducting Tunnel Junction Sensors for Nuclear Recoil Spectroscopy},
author = {Spencer L. Fretwell and Connor Bray and Inwook Kim and Andrew Marino and Benjamin Waters and Robin Cantor and Ad Hall and Pedro Amaro and Adrien Andoche and David Diercks and Abigail Gillespie and Mauro Guerra and Cameron N. Harris and Jackson T. Harris and Leendert M. Hayen and Paul Antoine Hervieux and Geon Bo Kim and Annika Lennarz and Vincenzo Lordi and Jorge Machado and Peter Machule and David McKeen and Xavier Mougeot and Francisco Ponce and Chris Ruiz and Amit Samanta and José Paulo Santos and Joseph Smolsky and Caitlyn Stone-Whitehead and Joseph Templet and Wouter Van De Pontseele and William K. Warburton and K. G. Leach and S. Friedrich},
journal= {arXiv preprint arXiv:2510.07792},
year = {2026}
}
备注
6 pages, 6 figures, presented at the 21st Low Temperature Detectors Conference