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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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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
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no
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69e4e730-182c-4c4f-bb08-59f658a56ee7 (old id 4282018)
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2014-02-03 10:42:16
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@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},
  keyword      = {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},
  volume       = {443},
  year         = {2000},
}