Performance of the SABRE detector module in a purely passive shielding
Performance of the SABRE detector module in a purely passive shielding
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SABRE 探测器模块在纯无源屏蔽中的性能
DOI：
10.1140/epjc/s10052-022-11108-z
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Di Ludovico, A.
中科院分区：
文献类型：
--
作者：
Calaprice, F.;Benziger, J. B.;Copello, S.;Dafinei, I.;D’Angelo, D.;D’Imperio, G.;Di Carlo, G.;Diemoz, M.;Di Giacinto, A.;Di Ludovico, A.
我们在这里提出了一个表征的低背景NaI（Tl）晶体NaI-33的基础上，近一年的数据采集（891 kgdays曝光）的探测器配置，没有使用有机闪烁否决权。这种非常放射性纯的晶体已经在SABRE原理验证（PoP）探测器中显示出低背景，在感兴趣的低能区域（1-6 keV），用于通过年度调制签名搜索暗物质相互作用。由于可否决的背景组件，如K，在这里是次主导的，我们重新组装了一个完全被动屏蔽的PoP设置。我们升级了基于提升决策树算法的事件选择，该算法拒绝了大部分PMT引起的噪声，同时保留闪烁信号，在1-6 keV中效率> 90%。我们发现在感兴趣的区域中的平均背景为1.39 ± 0.02计数/天/kg/keV，并且光谱与先前在PoP设置中获得的数据一致，其中外部否决背景抑制到位。我们的背景模型表明，占主导地位的背景成分是由于衰变的铅，只有部分居住在晶体本身。Pb的另一个位置是包裹晶体的反射箔。我们现在着手设计SABRE North探测器物理阶段的实验装置，该装置基于类似晶体阵列，使用低放射性PTFE反射器，并进一步改进被动屏蔽策略，以符合Gran Sasso国家实验室新的安全和环境要求。
We present here a characterization of the low background NaI(Tl) crystal NaI-33 based on a period of almost one year of data taking (891 kgdays exposure) in a detector configuration with no use of organic scintillator veto. This remarkably radio-pure crystal already showed a low background in the SABRE Proof-of-Principle (PoP) detector, in the low energy region of interest (1–6 keV) for the search of dark matter interaction via the annual modulation signature. As the vetoable background components, such asK, are here sub-dominant, we reassembled the PoP setup with a fully passive shielding. We upgraded the selection of events based on a Boosted Decision Tree algorithm that rejects most of the PMT-induced noise while retaining scintillation signals with > 90% efficiency in 1–6 keV. We find an average background of 1.39 ± 0.02 counts/day/kg/keV in the region of interest and a spectrum consistent with data previously acquired in the PoP setup, where the external veto background suppression was in place. Our background model indicates that the dominant background component is due to decays ofPb, only partly residing in the crystal itself. The other location ofPb is the reflector foil that wraps the crystal. We now proceed to design the experimental setup for the physics phase of the SABRE North detector, based on an array of similar crystals, using a low radioactivity PTFE reflector and further improving the passive shielding strategy, in compliance with the new safety and environmental requirements of Laboratori Nazionali del Gran Sasso.
使用 SABRE 原理验证探测器对超高纯度 NaI(Tl) 晶体闪烁体进行高灵敏度表征
影响因子：
5
作者：
Calaprice, F.;Copello, S.;Dafinei, I.;D’Angelo, D.;D’Imperio, G.;Di Carlo, G.;Diemoz, M.;Di Giacinto, A.;Di Ludovico, A.;Ianni, A.
通讯作者：
Ianni, A.
影响因子：
3.5
作者：
M. Antonello;E. Barberio;T. Baroncelli;J. Benziger;L. Bignell;I. Bolognino;F. Calaprice;S. Copello;D. D’Angelo;G. D’Imperio;I. Dafinei;G. D. Carlo;M. Diemoz;A. D. Ludovico;A. Duffy;F. Froborg;G. Giovanetti;E. Hoppe;A. Ianni;L. Ioannucci;S. Krishnan;G. Lane;I. Mahmood;A. Mariani;P. McGee;P. Montini;J. Mould;F. Nuti;D. Orlandi;M. Paris;V. Pettinacci;L. Pietrofaccia;D. Prokopovich;S. Rahatlou;N. Rossi;A. Sarbutt;E. Shields;M. Souza;A. Stuchbery;B. Suerfu;C. Tomei;P. Urquijo;C. Vignoli;M. Wada;A. Wallner;A. G. Williams;J. Xu;M. Milano;Milano;Italy;S. O. Physics;The University of Melbourne;Melbourne;Australia;Chemical Engineering Department;Princeton University;Princeton;Nj;USA.;D. Physics;The Australian National University;Canberra;D. Fisica;U. D. S. D. Milano-U.-D.-S.-D.-Milano-102421132;P. Department;I. G. Sasso;Assergi;I. -. G. S. S. Institute-I.-.-G.-S.-S.-Institute-102945001;Infn Roma;Roma;A. J. W. H. C. F. Astrophysics;Centre for Gravitational Astrophysics;Supercomputing;S. U. Technology;I. -. London;High Energy Physics;B. Laboratory;United Kingdom.;P. N. N. Laboratory-P.-N.-N.-Laboratory-7290024;Richland;Wa;The University of Adelaide;Adelaide;South Australia.;S. Roma;Australian Nuclear Science;Technology Organization;Lucas Heights
通讯作者：
M. Antonello;E. Barberio;T. Baroncelli;J. Benziger;L. Bignell;I. Bolognino;F. Calaprice;S. Copello;D. D’Angelo;G. D’Imperio;I. Dafinei;G. D. Carlo;M. Diemoz;A. D. Ludovico;A. Duffy;F. Froborg;G. Giovanetti;E. Hoppe;A. Ianni;L. Ioannucci;S. Krishnan;G. Lane;I. Mahmood;A. Mariani;P. McGee;P. Montini;J. Mould;F. Nuti;D. Orlandi;M. Paris;V. Pettinacci;L. Pietrofaccia;D. Prokopovich;S. Rahatlou;N. Rossi;A. Sarbutt;E. Shields;M. Souza;A. Stuchbery;B. Suerfu;C. Tomei;P. Urquijo;C. Vignoli;M. Wada;A. Wallner;A. G. Williams;J. Xu;M. Milano;Milano;Italy;S. O. Physics;The University of Melbourne;Melbourne;Australia;Chemical Engineering Department;Princeton University;Princeton;Nj;USA.;D. Physics;The Australian National University;Canberra;D. Fisica;U. D. S. D. Milano-U.-D.-S.-D.-Milano-102421132;P. Department;I. G. Sasso;Assergi;I. -. G. S. S. Institute-I.-.-G.-S.-S.-Institute-102945001;Infn Roma;Roma;A. J. W. H. C. F. Astrophysics;Centre for Gravitational Astrophysics;Supercomputing;S. U. Technology;I. -. London;High Energy Physics;B. Laboratory;United Kingdom.;P. N. N. Laboratory-P.-N.-N.-Laboratory-7290024;Richland;Wa;The University of Adelaide;Adelaide;South Australia.;S. Roma;Australian Nuclear Science;Technology Organization;Lucas Heights
通过直接地下计数表征 SABRE 晶体 NaI-33
DOI：
10.1140/epjc/s10052-021-09098-5
发表时间：
2021
期刊：
The European Physical Journal C
影响因子：
--
作者：
Antonello, M.;Arnquist, I. J.;Barberio, E.;Baroncelli, T.;Benziger, J.;Bignell, L. J.;Bolognino, I.;Calaprice, F.;Copello, S.;Dafinei, I.
通讯作者：
Dafinei, I.