LArGe R&D for active background suppression in GERDA

被引：46

作者：

Agostini, M. ^{[1
]}

Barnabe-Heider, M. ^{[1
]}

Budjas, D. ^{[1
]}

Cattadori, C. ^{[2
,3
]}

D'Andragora, A. ^{[2
,3
]}

Gangapshev, A. ^{[1
,4
]}

Gusev, K. ^{[1
,5
,6
]}

Heisel, M. ^{[1
]}

Junker, M. ^{[7
]}

Klimenko, A. ^{[1
,5
]}

Schoenert, S. ^{[1
]}

Smolnikov, A. ^{[1
,5
]}

Zuzel, G. ^{[1
]}

机构：

[1] Max Planck Inst Kernphys, Heidelberg, Germany

[2] Univ Milan, Milan, Italy

[3] INFN, Milan, Italy

[4] Inst Nucl Res, Moscow, Russia

[5] Joint Inst Nucl Res, Dubna, Russia

[6] Kurchatov Inst, Natl Res Ctr, Moscow, Russia

[7] Lab Nazl Gran Sasso, Assergi, Italy

来源：

12TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2011), PTS 1-6 | 2012年 / 375卷

关键词：

D O I：

10.1088/1742-6596/375/1/042009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

LArGe is a GERDA low-background test facility to study novel background suppression methods in a low-background environment, for future application in the GERDA experiment. Similar to GERDA, LArGe operates bare germanium detectors submersed into liquid argon (1m(3), 1.4 tons), which in addition is instrumented with photomultipliers to detect argon scintillation light. The light is used in anti-coincidence with the germanium detectors to effectively suppress background events that deposit energy in the liquid argon. The background suppression efficiency was studied in combination with a pulse shape discrimination (PSD) technique using a BEGe detector for various sources, which represent characteristic backgrounds to GERDA. Suppression factors of a few times 10(3) have been achieved. First background data of LArGe with a coaxial HPGe detector (without PSD) yield a background index of the order 10(-2) cts/(keV.kg.y), which is at the level of the GERDA phase I design goal. As a consequence of these results, the development of an active liquid argon veto in GERDA is pursued.

引用

页数：4

共 4 条

[1]

Abt I, 2004, GERDA GERMANIUM DET

[2] Pulse shape discrimination studies with a Broad-Energy Germanium detector for signal identification and background suppression in the GERDA double beta decay experiment [J].