Neutron inelastic scattering in natural Cu as a background in neutrinoless double-beta decay experiments

Abstract

Experiments designed to study rare processes, such as neutrinoless double beta decay ($0\nu \beta \beta$), are crucial tests for physics beyond the standard model. These experiments rely on reducing the intrinsic radioactive background to unprecedented levels, while adequately shielding the detectors from external sources of radioactivity. An understanding of the potential for neutron excitation of the shielding and detector materials is important for obtaining this level of sensitivity. Using the broad-spectrum neutron beam at LANSCE, we have measured inelastic neutron scattering on ${}^{nat}$Cu. The goal of this work is focused on understanding the background rates from neutrons interacting in these materials in regions around the Q-values of many candidate $0\nu \beta \beta$ decay isotopes, as well as providing data for benchmarking Monte Carlo simulations of background events. Results: We extracted the level cross sections from the $\gamma$ production cross section for 46 energy levels in ${}^{nat}$Cu . These level cross sections were compared with the available experimental data, as well as the ENDF/B-VII evaluation for discrete levels. We also examined the potential implications of our measurements on $0\nu \beta \beta$ measurements and found that many of the commonly studied $0\nu \beta \beta$ isotopes had Q-values below the cutoff for ENDF/B-VII evaluated discrete levels in either Cu nucleus.

arXiv comment15 pages, 18 figures

References in corpus (14)

• Double Beta Decay, Majorana Neutrinos, and Neutrino Mass
• Double Beta Decay
• The Igex 76ge Neutrinoless Double-Beta Decay Experiment: Prospects for Next Generation Experiments
• Muon-Induced Background Study for Underground Laboratories
• Limits on the Majorana neutrino mass in the 0.1 eV range
• Evidence of theta(13)>0 from global neutrino data analysis
• Double Beta Decay
• Observation of Two-Neutrino Double-Beta Decay in Xe-136 with EXO-200
• Technical design and performance of the NEMO3 detector
• The Majorana Neutrinoless Double-Beta Decay Experiment
• Neutron Inelastic Scattering Processes as Background for Double-Beta Decay Experiments
• Neutron inelastic scattering and reactions in natural Pb as a background in neutrinoless double-beta-decay experiments
• The Majorana Project
• The MAJORANA 76Ge neutrino less double-beta decay project: A brief update

Cited by in corpus (1)

• Neutrinoless Double-Beta Decay: Status and Prospects