TY - JOUR

T1 - Estimating the mass variance in neutron multiplicity counting—A comparison of approaches

AU - Dubi, C.

AU - Croft, S.

AU - Favalli, A.

AU - Ocherashvili, A.

AU - Pedersen, B.

N1 - Funding Information:
This work was sponsored in part by the U.S. Department of Energy (DOE) , National Nuclear Security Administration (NNSA) , Office of Nonproliferation Research and Development (NA-22) .
Publisher Copyright:
© 2017 Elsevier B.V.

PY - 2017/12/11

Y1 - 2017/12/11

N2 - In the standard practice of neutron multiplicity counting, the first three sampled factorial moments of the event triggered neutron count distribution are used to quantify the three main neutron source terms: the spontaneous fissile material effective mass, the relative (α,n) production and the induced fission source responsible for multiplication. This study compares three methods to quantify the statistical uncertainty of the estimated mass: the bootstrap method, propagation of variance through moments, and statistical analysis of cycle data method. Each of the three methods was implemented on a set of four different NMC measurements, held at the JRC-laboratory in Ispra, Italy, sampling four different Pu samples in a standard Plutonium Scrap Multiplicity Counter (PSMC) well counter.

AB - In the standard practice of neutron multiplicity counting, the first three sampled factorial moments of the event triggered neutron count distribution are used to quantify the three main neutron source terms: the spontaneous fissile material effective mass, the relative (α,n) production and the induced fission source responsible for multiplication. This study compares three methods to quantify the statistical uncertainty of the estimated mass: the bootstrap method, propagation of variance through moments, and statistical analysis of cycle data method. Each of the three methods was implemented on a set of four different NMC measurements, held at the JRC-laboratory in Ispra, Italy, sampling four different Pu samples in a standard Plutonium Scrap Multiplicity Counter (PSMC) well counter.

KW - Neutron multiplicity counting

KW - Passive neutron interrogation

KW - Uncertainty quantification

UR - http://www.scopus.com/inward/record.url?scp=85029810128&partnerID=8YFLogxK

U2 - 10.1016/j.nima.2017.08.036

DO - 10.1016/j.nima.2017.08.036

M3 - Article

AN - SCOPUS:85029810128

VL - 875

SP - 125

EP - 131

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

ER -