Performance and stability tests of bare high purity germanium detectors in 
liquid argon for the GERDA experiment

Barnabé Heider, Marik

Performance and stability tests of bare high purity germanium detectors in liquid argon for the GERDA experiment

Barnabé Heider, M. (2009). Performance and stability tests of bare high purity germanium detectors in liquid argon for the GERDA experiment. PhD Thesis, Ruprecht-Karls Universität, Heidelberg.

Item is 公開

表示: 全項目

基本情報

非表示:

アイテムのパーマリンク: https://hdl.handle.net/11858/00-001M-0000-0011-757F-E 版のパーマリンク: https://hdl.handle.net/11858/00-001M-0000-0011-7581-6

資料種別: 学位論文

ファイル

非表示: ファイル

:

phd_Barnabe.pdf (全文テキスト（全般）), 29MB

表示保存

ファイルのパーマリンク:
https://hdl.handle.net/11858/00-001M-0000-0011-757E-0

ファイル名:
phd_Barnabe.pdf

説明:
-

OA-Status:

閲覧制限:
公開

MIMEタイプ / チェックサム:
application/pdf / [MD5]

技術的なメタデータ:

表示

著作権日付:
-

著作権情報:
eDoc_access: PUBLIC

CCライセンス:
-

作成者

非表示:

作成者:
Barnabé Heider, Marik¹, 著者

所属:
1Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society, ou_904549

内容説明

非表示:

キーワード: -

要旨: GERDA will search for neutrinoless double beta decay of 76Ge by using a novel approach of bare germanium detectors in liquid argon (LAr). Enriched germanium detectors from the previous Heidelberg-Moscow and IGEX experiments have been reprocessed and will be deployed in GERDA Phase-I. At the center of this thesis project is the study of the performance of bare germanium detectors in cryogenic liquids. Identical detector performance as in vacuum cryostats (2.2 keV FWHM at 1.3 MeV) was achieved in cryogenic liquids with a new low-mass detector assembly and contacts. One major result is the discovery of a radiation induced leakage current (LC) increase when operating bare detectors with standard passivation layers in LAr. Charge collection and build-up on the passivation layer were identified as the origin of the LC increase. It was found that diodes without passivation do not exhibit this feature. Three month-long stable operation in LAr at 5 pA LC under periodic gamma irradiation demonstrated the suitability of the modifed detector design. Based on these results, all Phase-I detectors were reprocessed without passivation layer and subsequently successfully characterized in LAr in the GERDA underground Detector Laboratory. The mass loss during the reprocessing was 300 g out of 17.9 kg and the exposure above ground 5 days. This results in a negligible cosmogenic background increase of 5x10-4 cts/(keV kg y) at 76Ge Q for 60Co and 68Ge.

資料詳細

非表示:

言語: eng - English

日付: 受理: 2009-05-27

出版の状態: 受理 / 印刷中

ページ: 151 S. : Ill., graph. Darst.

出版情報: Heidelberg : Ruprecht-Karls Universität

目次: -

査読: -

識別子（DOI, ISBNなど）: eDoc: 487027

学位: 博士号 (PhD)

アイテム詳細

基本情報

ファイル

関連URL

作成者

内容説明

資料詳細

関連イベント

訴訟

Project information

出版物