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RoSiB - a 4 pi silicon ball for charged-particle detection in EUROBALL

Pausch, G ; Prade, H ; Sobiella, M ; Schnare, H ; Schwengner, R ; Kaubler, L ; Borcan, C ; Ortlepp, HG ; Oehmichen, U and Grawe, H , et al. (2000) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 443(2-3). p.304-318
Abstract
A 4 pi silicon bail for detection and identification of light charged particles in large multidetector gamma-arrays as EUROBALL is presented. The design is based on a N = 42 ball with 12 pentagons and 30 hexagons as used in the GASP array. The absorptive material for gamma-rays is minimized to the detector thickness of 300 or 500 mu m and a 0.63 mm ceramic backing. The geometrical coverage is designed for about 90% of 4 pi. A pulse shape discrimination method with totally depleted detectors working in the reverse mount allows identifying protons and alpha-particles above an energy threshold of about 2 MeV. The performances of the ball were rested at the tandem - booster accelerator combination of the MPI Heidelberg in two experiments using... (More)
A 4 pi silicon bail for detection and identification of light charged particles in large multidetector gamma-arrays as EUROBALL is presented. The design is based on a N = 42 ball with 12 pentagons and 30 hexagons as used in the GASP array. The absorptive material for gamma-rays is minimized to the detector thickness of 300 or 500 mu m and a 0.63 mm ceramic backing. The geometrical coverage is designed for about 90% of 4 pi. A pulse shape discrimination method with totally depleted detectors working in the reverse mount allows identifying protons and alpha-particles above an energy threshold of about 2 MeV. The performances of the ball were rested at the tandem - booster accelerator combination of the MPI Heidelberg in two experiments using the high-recoil reaction of 228 MeV Ni-58 + Ti-46 and the low-recoil reaction of 95 MeV O-16 + Ni-58. The two-dimensional spectra of zero-crossing (ZC) versus energy confirmed an excellent discrimination of protons and alpha-particles in all the detectors at different angles. The energy spectra of protons and alpha-particles measured in the experiments are presented. too. The gamma-spectra measured in coincidence with various combinations of emitted particles showed a high selectivity of the ball. The reduced total efficiency for protons of 59% and 55% and alpha-particles of 44% and 32% measured in a nuclear spectroscopy application is analyzed in a Monte-Carlo simulation (GEANT). It is due to a combined influence of a thick target needed to stop the recoiling residual nuclei and thick absorbers needed to protect the Si-detectors from scattered beam. The results along with the GEANT extrapolation to optimum experimental conditions confirm that RoSiB is a highly efficient and selective device for identification of rare reaction channels with heavy ions. (C) 2000 Elsevier Science B.V. All rights reserved. (Less)
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
EUROBALL Si-ball, charged particle detection, pulse shape discrimination, with Si-detectors
in
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
volume
443
issue
2-3
pages
304 - 318
publisher
Elsevier
external identifiers
  • wos:000086271200010
  • scopus:0033904243
ISSN
0167-5087
DOI
10.1016/S0168-9002(99)01090-6
language
English
LU publication?
no
id
69e4e730-182c-4c4f-bb08-59f658a56ee7 (old id 4282018)
date added to LUP
2016-04-01 17:10:31
date last changed
2022-01-29 00:50:09
@article{69e4e730-182c-4c4f-bb08-59f658a56ee7,
  abstract     = {{A 4 pi silicon bail for detection and identification of light charged particles in large multidetector gamma-arrays as EUROBALL is presented. The design is based on a N = 42 ball with 12 pentagons and 30 hexagons as used in the GASP array. The absorptive material for gamma-rays is minimized to the detector thickness of 300 or 500 mu m and a 0.63 mm ceramic backing. The geometrical coverage is designed for about 90% of 4 pi. A pulse shape discrimination method with totally depleted detectors working in the reverse mount allows identifying protons and alpha-particles above an energy threshold of about 2 MeV. The performances of the ball were rested at the tandem - booster accelerator combination of the MPI Heidelberg in two experiments using the high-recoil reaction of 228 MeV Ni-58 + Ti-46 and the low-recoil reaction of 95 MeV O-16 + Ni-58. The two-dimensional spectra of zero-crossing (ZC) versus energy confirmed an excellent discrimination of protons and alpha-particles in all the detectors at different angles. The energy spectra of protons and alpha-particles measured in the experiments are presented. too. The gamma-spectra measured in coincidence with various combinations of emitted particles showed a high selectivity of the ball. The reduced total efficiency for protons of 59% and 55% and alpha-particles of 44% and 32% measured in a nuclear spectroscopy application is analyzed in a Monte-Carlo simulation (GEANT). It is due to a combined influence of a thick target needed to stop the recoiling residual nuclei and thick absorbers needed to protect the Si-detectors from scattered beam. The results along with the GEANT extrapolation to optimum experimental conditions confirm that RoSiB is a highly efficient and selective device for identification of rare reaction channels with heavy ions. (C) 2000 Elsevier Science B.V. All rights reserved.}},
  author       = {{Pausch, G and Prade, H and Sobiella, M and Schnare, H and Schwengner, R and Kaubler, L and Borcan, C and Ortlepp, HG and Oehmichen, U and Grawe, H and Schubart, R and Gerl, J and Cederkäll, Joakim and Johnson, A and Kerek, A and Klamra, W and Moszynski, M and Wolski, D and Kapusta, M and Axelsson, A and Weiszflog, M and Hartlein, T and Pansegrau, D and de Angelis, G and Ashrafi, S and Likar, A and Lipoglavsek, M}},
  issn         = {{0167-5087}},
  keywords     = {{EUROBALL Si-ball; charged particle detection; pulse shape discrimination; with Si-detectors}},
  language     = {{eng}},
  number       = {{2-3}},
  pages        = {{304--318}},
  publisher    = {{Elsevier}},
  series       = {{Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment}},
  title        = {{RoSiB - a 4 pi silicon ball for charged-particle detection in EUROBALL}},
  url          = {{http://dx.doi.org/10.1016/S0168-9002(99)01090-6}},
  doi          = {{10.1016/S0168-9002(99)01090-6}},
  volume       = {{443}},
  year         = {{2000}},
}