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Title: Future Gamma-Detector Arrays for Radioactive Beam Applications

Abstract

Nuclear spectroscopy using radioactive isotope beams requires dedicated set-ups. State-of-the-art Ge arrays recently started to provide valuable {gamma} spectroscopic data. However, to fully exploit the exotic beams lasting detection deficiencies have to be solved. They result from limited beam intensity, particularly for the most exotic nuclei, a wide range of beam velocities (from stopped to v/c{approx}0.5), high {gamma} ray and particle background and {gamma} ray multiplicities up to M{<=}30, which are typical characteristics of the reactions. A 4{pi} {gamma}-ray array with highest efficiency, selectivity and energy resolution is required which is capable of high event rates. These features can only be achieved with a close packed arrangement of detectors. The individual interaction points of the {gamma} quanta have to be disentangled by tracking algorithms. The Advanced GAmma Tracking Array, AGATA, will provide 25% to 40% full energy efficiency depending on the {gamma} multiplicity. The position resolution is sufficient for an energy resolution of 0.4% at a beam velocity of v/c=0.5. For decay experiments a compact array of Ge planar stack detectors with 2D strip segmentation might be the ideal solution. The planned NUSTAR-DESPEC Ge array will consist of up to 24 detector units with three planar crystals each, resulting inmore » 13824 voxels. Providing 15% efficiency it may increase the correlation time range for decay {gamma} rays to 10 ns - 1 s{exclamation_point} Yet another development line, investigated by the NUSTAR collaboration, is high resolution scintillators. Novel crystal materials, e.g. LaBr3(Ce), promise intrinsic energy resolution of about 2%. This is sufficient for calorimetric applications but also for spectroscopy after Coulomb excitation and fragmentation reactions at relativistic beam energies.« less

Authors:
 [1]
  1. GSI Darmstadt (Germany)
Publication Date:
OSTI Identifier:
20719723
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 802; Journal Issue: 1; Conference: ENS'05: International symposium on exotic nuclear systems, Debrecen (Hungary), 20-25 Jun 2005; Other Information: DOI: 10.1063/1.2140619; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALGORITHMS; CORRELATIONS; COULOMB EXCITATION; CRYSTALS; ENERGY EFFICIENCY; ENERGY RESOLUTION; GAMMA DETECTION; GAMMA RADIATION; GAMMA SPECTROMETERS; MULTIPLICITY; NUCLEAR FRAGMENTATION; PHOSPHORS; RADIATION SOURCES; RADIOISOTOPES; RELATIVISTIC RANGE; SPECTROSCOPY

Citation Formats

Gerl, J. Future Gamma-Detector Arrays for Radioactive Beam Applications. United States: N. p., 2005. Web. doi:10.1063/1.2140619.
Gerl, J. Future Gamma-Detector Arrays for Radioactive Beam Applications. United States. doi:10.1063/1.2140619.
Gerl, J. Mon . "Future Gamma-Detector Arrays for Radioactive Beam Applications". United States. doi:10.1063/1.2140619.
@article{osti_20719723,
title = {Future Gamma-Detector Arrays for Radioactive Beam Applications},
author = {Gerl, J.},
abstractNote = {Nuclear spectroscopy using radioactive isotope beams requires dedicated set-ups. State-of-the-art Ge arrays recently started to provide valuable {gamma} spectroscopic data. However, to fully exploit the exotic beams lasting detection deficiencies have to be solved. They result from limited beam intensity, particularly for the most exotic nuclei, a wide range of beam velocities (from stopped to v/c{approx}0.5), high {gamma} ray and particle background and {gamma} ray multiplicities up to M{<=}30, which are typical characteristics of the reactions. A 4{pi} {gamma}-ray array with highest efficiency, selectivity and energy resolution is required which is capable of high event rates. These features can only be achieved with a close packed arrangement of detectors. The individual interaction points of the {gamma} quanta have to be disentangled by tracking algorithms. The Advanced GAmma Tracking Array, AGATA, will provide 25% to 40% full energy efficiency depending on the {gamma} multiplicity. The position resolution is sufficient for an energy resolution of 0.4% at a beam velocity of v/c=0.5. For decay experiments a compact array of Ge planar stack detectors with 2D strip segmentation might be the ideal solution. The planned NUSTAR-DESPEC Ge array will consist of up to 24 detector units with three planar crystals each, resulting in 13824 voxels. Providing 15% efficiency it may increase the correlation time range for decay {gamma} rays to 10 ns - 1 s{exclamation_point} Yet another development line, investigated by the NUSTAR collaboration, is high resolution scintillators. Novel crystal materials, e.g. LaBr3(Ce), promise intrinsic energy resolution of about 2%. This is sufficient for calorimetric applications but also for spectroscopy after Coulomb excitation and fragmentation reactions at relativistic beam energies.},
doi = {10.1063/1.2140619},
journal = {AIP Conference Proceedings},
number = 1,
volume = 802,
place = {United States},
year = {Mon Nov 21 00:00:00 EST 2005},
month = {Mon Nov 21 00:00:00 EST 2005}
}