A Pulse Shape Analysis technique for the MAJORANA experiment

R. J. Cooper; D. C. Radford; K. Lagergren; James F. Colaresi; Larry Darken; R. Henning; M. G. Marino; K. Michael Yocum

doi:10.1016/j.nima.2010.11.029

A Pulse Shape Analysis technique for the MAJORANA experiment

R. J. Cooper, D. C. Radford, K. Lagergren, James F. Colaresi, Larry Darken, R. Henning, M. G. Marino, K. Michael Yocum

Physics Division

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

In order to achieve background count rates sufficiently low so as to allow the observation of rare events such as neutrinoless double beta (0νββ) decay, background suppression techniques are routinely employed. In this paper we present details of a novel Pulse Shape Analysis algorithm, which allows single-site events such as 0νββ decay to be distinguished from multi-site background events in germanium detectors. The algorithm, which is based on the event-by-event χ² fitting of experimental signals to a basis data set of unique single-site pulse shapes, has been developed through simulation studies and tested experimentally using a Broad Energy Germanium detector. It is found experimentally that the technique is able to successfully identify and reject 99% of multi-site events in the single escape peak associated with the gamma decay of ²⁰⁸Tl, whilst maintaining a survival probability of 98% for neutrinoless double-beta-decay- like double escape peak events.

Original language	English
Pages (from-to)	303-310
Number of pages	8
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	629
Issue number	1
DOIs	https://doi.org/10.1016/j.nima.2010.11.029
State	Published - Feb 11 2011

Funding

Research sponsored by the Office of Nuclear Physics, US Department of Energy . The Joint Institute for Heavy Ion Research has as member institutions: the University of Tennessee, Vanderbilt University and the Oak Ridge National Laboratory; it is supported by the members and by the US Department of Energy. One of the authors is supported by the National Science Foundation.

Funders	Funder number
Joint Institute for Heavy Ion Research
Office of Nuclear Physics
US Department of Energy
National Science Foundation
Oak Ridge National Laboratory
Vanderbilt University
University of Tennessee

Keywords

Background rejection
HPGe detector
Neutrinoless double beta decay
Pulse Shape Analysis

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10.1016/j.nima.2010.11.029

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Cooper, R. J., Radford, D. C., Lagergren, K., Colaresi, J. F., Darken, L., Henning, R., Marino, M. G., & Michael Yocum, K. (2011). A Pulse Shape Analysis technique for the MAJORANA experiment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 629(1), 303-310. https://doi.org/10.1016/j.nima.2010.11.029

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title = "A Pulse Shape Analysis technique for the MAJORANA experiment",

abstract = "In order to achieve background count rates sufficiently low so as to allow the observation of rare events such as neutrinoless double beta (0νββ) decay, background suppression techniques are routinely employed. In this paper we present details of a novel Pulse Shape Analysis algorithm, which allows single-site events such as 0νββ decay to be distinguished from multi-site background events in germanium detectors. The algorithm, which is based on the event-by-event χ2 fitting of experimental signals to a basis data set of unique single-site pulse shapes, has been developed through simulation studies and tested experimentally using a Broad Energy Germanium detector. It is found experimentally that the technique is able to successfully identify and reject 99% of multi-site events in the single escape peak associated with the gamma decay of 208Tl, whilst maintaining a survival probability of 98% for neutrinoless double-beta-decay- like double escape peak events.",

keywords = "Background rejection, HPGe detector, Neutrinoless double beta decay, Pulse Shape Analysis",

author = "Cooper, {R. J.} and Radford, {D. C.} and K. Lagergren and Colaresi, {James F.} and Larry Darken and R. Henning and Marino, {M. G.} and {Michael Yocum}, K.",

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Cooper, RJ, Radford, DC, Lagergren, K, Colaresi, JF, Darken, L, Henning, R, Marino, MG & Michael Yocum, K 2011, 'A Pulse Shape Analysis technique for the MAJORANA experiment', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 629, no. 1, pp. 303-310. https://doi.org/10.1016/j.nima.2010.11.029

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AU - Cooper, R. J.

AU - Radford, D. C.

AU - Lagergren, K.

AU - Colaresi, James F.

AU - Darken, Larry

AU - Henning, R.

AU - Marino, M. G.

AU - Michael Yocum, K.

PY - 2011/2/11

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N2 - In order to achieve background count rates sufficiently low so as to allow the observation of rare events such as neutrinoless double beta (0νββ) decay, background suppression techniques are routinely employed. In this paper we present details of a novel Pulse Shape Analysis algorithm, which allows single-site events such as 0νββ decay to be distinguished from multi-site background events in germanium detectors. The algorithm, which is based on the event-by-event χ2 fitting of experimental signals to a basis data set of unique single-site pulse shapes, has been developed through simulation studies and tested experimentally using a Broad Energy Germanium detector. It is found experimentally that the technique is able to successfully identify and reject 99% of multi-site events in the single escape peak associated with the gamma decay of 208Tl, whilst maintaining a survival probability of 98% for neutrinoless double-beta-decay- like double escape peak events.

AB - In order to achieve background count rates sufficiently low so as to allow the observation of rare events such as neutrinoless double beta (0νββ) decay, background suppression techniques are routinely employed. In this paper we present details of a novel Pulse Shape Analysis algorithm, which allows single-site events such as 0νββ decay to be distinguished from multi-site background events in germanium detectors. The algorithm, which is based on the event-by-event χ2 fitting of experimental signals to a basis data set of unique single-site pulse shapes, has been developed through simulation studies and tested experimentally using a Broad Energy Germanium detector. It is found experimentally that the technique is able to successfully identify and reject 99% of multi-site events in the single escape peak associated with the gamma decay of 208Tl, whilst maintaining a survival probability of 98% for neutrinoless double-beta-decay- like double escape peak events.

KW - Background rejection

KW - HPGe detector

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A Pulse Shape Analysis technique for the MAJORANA experiment

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