Neutron damage tests of a highly segmented germanium crystal

T. J. Ross; C. W. Beausang; I. Y. Lee; A. O. Macchiavelli; S. Gros; M. Cromaz; R. M. Clark; P. Fallon; H. Jeppesen; J. M. Allmond

doi:10.1016/j.nima.2009.04.024

Neutron damage tests of a highly segmented germanium crystal

T. J. Ross, C. W. Beausang, I. Y. Lee, A. O. Macchiavelli, S. Gros, M. Cromaz, R. M. Clark, P. Fallon, H. Jeppesen, J. M. Allmond

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10 Scopus citations

Abstract

To evaluate the effect of neutron damage on the performance of highly segmented germanium detectors the P3 prototype detector for the GRETINA array was subjected to a neutron flux of ∼3×10⁹ n/cm² over a period of 5 days. During the irradiation, the resolution (full-width half-maximum (FWHM)) of the 1332 keV ⁶⁰Co photopeak increased from ∼1.8 to ∼6.0 keV while the full-width at tenth maximum (FWTM) increased from ∼4 keV to more than 12 keV. Following the irradiation the detector was successfully annealed and the energy resolution returned to pre-irradiation values. All detector segments were fully functional before and after the annealing and following multiple room-temperature cycles. A comparison of digitized pulse shapes in the damaged and annealed detector indicates that the effect of extreme neutron damage (FWHM=6 keV) on the position resolution is on the order of ∼1.7 mm while for 3 keV resolution the position resolution degrades by ∼0.5 mm.

Original language	English
Pages (from-to)	533-544
Number of pages	12
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	606
Issue number	3
DOIs	https://doi.org/10.1016/j.nima.2009.04.024
State	Published - Jul 21 2009
Externally published	Yes

Funding

This work was performed under the auspices of the U.S. Department of Energy by the University of Richmond under grant numbers DE-FG52-06NA26206 and DE-FG02-05ER41379. The work at Lawrence Berkeley National Laboratory is supported by the U.S. DOE under Contract Number DE-AC02-05CH11231.

Funders	Funder number
University of Richmond	DE-FG02-05ER41379, DE-FG52-06NA26206
U.S. Department of Energy	DE-AC02-05CH11231

Keywords

Gamma-ray arrays
Gamma-ray tracking
Germanium detectors
Neutron damage

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10.1016/j.nima.2009.04.024

Cite this

Ross, T. J., Beausang, C. W., Lee, I. Y., Macchiavelli, A. O., Gros, S., Cromaz, M., Clark, R. M., Fallon, P., Jeppesen, H., & Allmond, J. M. (2009). Neutron damage tests of a highly segmented germanium crystal. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 606(3), 533-544. https://doi.org/10.1016/j.nima.2009.04.024

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abstract = "To evaluate the effect of neutron damage on the performance of highly segmented germanium detectors the P3 prototype detector for the GRETINA array was subjected to a neutron flux of ∼3×109 n/cm2 over a period of 5 days. During the irradiation, the resolution (full-width half-maximum (FWHM)) of the 1332 keV 60Co photopeak increased from ∼1.8 to ∼6.0 keV while the full-width at tenth maximum (FWTM) increased from ∼4 keV to more than 12 keV. Following the irradiation the detector was successfully annealed and the energy resolution returned to pre-irradiation values. All detector segments were fully functional before and after the annealing and following multiple room-temperature cycles. A comparison of digitized pulse shapes in the damaged and annealed detector indicates that the effect of extreme neutron damage (FWHM=6 keV) on the position resolution is on the order of ∼1.7 mm while for 3 keV resolution the position resolution degrades by ∼0.5 mm.",

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Ross, TJ, Beausang, CW, Lee, IY, Macchiavelli, AO, Gros, S, Cromaz, M, Clark, RM, Fallon, P, Jeppesen, H & Allmond, JM 2009, 'Neutron damage tests of a highly segmented germanium crystal', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 606, no. 3, pp. 533-544. https://doi.org/10.1016/j.nima.2009.04.024

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AU - Ross, T. J.

AU - Beausang, C. W.

AU - Lee, I. Y.

AU - Macchiavelli, A. O.

AU - Gros, S.

AU - Cromaz, M.

AU - Clark, R. M.

AU - Fallon, P.

AU - Jeppesen, H.

AU - Allmond, J. M.

PY - 2009/7/21

Y1 - 2009/7/21

N2 - To evaluate the effect of neutron damage on the performance of highly segmented germanium detectors the P3 prototype detector for the GRETINA array was subjected to a neutron flux of ∼3×109 n/cm2 over a period of 5 days. During the irradiation, the resolution (full-width half-maximum (FWHM)) of the 1332 keV 60Co photopeak increased from ∼1.8 to ∼6.0 keV while the full-width at tenth maximum (FWTM) increased from ∼4 keV to more than 12 keV. Following the irradiation the detector was successfully annealed and the energy resolution returned to pre-irradiation values. All detector segments were fully functional before and after the annealing and following multiple room-temperature cycles. A comparison of digitized pulse shapes in the damaged and annealed detector indicates that the effect of extreme neutron damage (FWHM=6 keV) on the position resolution is on the order of ∼1.7 mm while for 3 keV resolution the position resolution degrades by ∼0.5 mm.

AB - To evaluate the effect of neutron damage on the performance of highly segmented germanium detectors the P3 prototype detector for the GRETINA array was subjected to a neutron flux of ∼3×109 n/cm2 over a period of 5 days. During the irradiation, the resolution (full-width half-maximum (FWHM)) of the 1332 keV 60Co photopeak increased from ∼1.8 to ∼6.0 keV while the full-width at tenth maximum (FWTM) increased from ∼4 keV to more than 12 keV. Following the irradiation the detector was successfully annealed and the energy resolution returned to pre-irradiation values. All detector segments were fully functional before and after the annealing and following multiple room-temperature cycles. A comparison of digitized pulse shapes in the damaged and annealed detector indicates that the effect of extreme neutron damage (FWHM=6 keV) on the position resolution is on the order of ∼1.7 mm while for 3 keV resolution the position resolution degrades by ∼0.5 mm.

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Neutron damage tests of a highly segmented germanium crystal

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