氙气中中性轫致辐射发射的揭示
仪器与探测器
2022-05-17 v2 天体物理仪器与方法
原子物理
摘要
我们利用NEXT-White TPC与一套专用装置，给出了气态氙中基于非激基的二次闪烁的证据。与第一性原理计算的详细比对使我们能将此闪烁机制归因于中性轫致辐射（NBrS）——一个曾被假定存在于氙中却长期被忽视的过程。对于低于1000 nm的光子发射，NBrS产额在约50 V cm bar的减压电场值下从约10 photon/e cm bar增加到500 V cm bar时的高于310 photon/e cm bar。在通常用以产生电致发光的1.5 kV cm bar以上，估计NBrS以约1 photon/e cm bar的强度存在，这比传统的基于激基的电致发光低约两个数量级。尽管比其激基对应物微弱，我们的计算表明NBrS会产生发光本底，在气相或液相中均可干扰区分和/或精确测量低初级闪烁信号（S1）的能力。我们特别显示，在“缓冲”与“否决”区域中即是如此，那里将电场保持低于电致发光（EL）阈值不足以熄灭二次闪烁。这些区域的电场应谨慎选择以避免不可容忍的NBrS发射水平。此外，我们表明这一新的光发射源为在未来用于中微子与暗物质物理的单相液氙TPC中获得用于甄别目的的S2信号开辟了一条可行路径，其估计产额可达20-50 photons/e cm。
引用
@article{arxiv.2202.02614,
title = {Neutral Bremsstrahlung emission in xenon unveiled},
author = {C. A. O. Henriques and P. Amedo and J. M. R. Teixeira and D. Gonzalez-Diaz and C. D. R. Azevedo and A. Para and J. Martin-Albo and A. Saa Hernandez and J. J. Gomez-Cadenas and D. R. Nygren and C. M. B. Monteiro and C. Adams and V. Alvarez and L. Arazi and I. J. Arnquist and K. Bailey and F. Ballester and J. M. Benlloch-Rodriguez and F. I. G. M. Borges and N. Byrnes and S. Carcel and J. V. Carrion and S. Cebrian and E. Church and C. A. N. Conde and T. Contreras and G. Diaz and J. Diaz and M. Diesburg and J. Escada and R. Esteve and R. Felkai and A. F. M. Fernandes and L. M. P. Fernandes and P. Ferrario and A. L. Ferreira and E. D. C. Freitas and J. Generowicz and S. Ghosh and A. Goldschmidt and R. Guenette and R. M. Gutierrez and J. Haefner and K. Hafidi and J. Hauptman and J. A. Hernando Morata and P. Herrero and V. Herrero and Y. Ifergan and B. J. P. Jones and M. Kekic and L. Labarga and A. Laing and P. Lebrun and N. Lopez-March and M. Losada and R. D. P. Mano and A. Martinez and M. Martinez-Vara and G. Martinez-Lema and A. D. McDonald and F. Monrabal and F. J. Mora and J. Munoz Vidal and P. Novella and B. Palmeiro and J. Perez and M. Querol and A. B. Redwine and J. Renner and J. Repond and S. Riordan and L. Ripoll and Y. Rodriguez Garcia and J. Rodriguez and L. Rogers and B. Romeo and C. Romo-Luque and F. P. Santos and J. M. F. dos Santos and A. Simon and C. Sofka and M. Sorel and T. Stiegler and J. F. Toledo and J. Torrent and A. Uson and J. F. C. A. Veloso and R. Webb and R. Weiss-Babai and J. T. White and K. Woodruff and N. Yahlali},
journal= {arXiv preprint arXiv:2202.02614},
year = {2022}
}
备注
Published in Physical Review X