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Title: Measurement of the neutron-capture cross section of 76Ge and 74Ge below 15 MeV and its relevance to 0 ν β β decay searches of 76Ge

Abstract

The neutron radiative-capture cross section of ⁷⁶Ge was measured between 0.4 and 14.8 MeV using the activation technique. Germanium samples with the isotopic abundance of ~86% ⁷⁶Ge and ~14% ⁷⁴Ge used in the 0νββ searches by the GERDA and Majorana Collaborations were irradiated with monoenergetic neutrons produced at eleven energies via the ³H(p,n)³He, ²H(d,n)³He and ³H(d,n)⁴He reactions. Previously, data existed only at thermal energies and at 14 MeV. As a by-product, capture cross-section data were also obtained for ⁷⁴Ge at neutron energies below 8 MeV. Indium and gold foils were irradiated simultaneously for neutron fluence determination. High-resolution γ-ray spectroscopy was used to determine the γ-ray activity of the daughter nuclei of interest. For the ⁷⁶Ge total capture cross section the present data are in good agreement with the TENDL-2013 model calculations and the ENDF/B-VII.1 evaluations, while for the ⁷⁴Ge(n,γ)⁷⁵Ge reaction, the present data are about a factor of two larger than predicted. It was found that the ⁷⁴Ge(n,γ)⁷⁵Ge yield in the High-Purity Germanium (HPGe) detectors used by the GERDA and Majorana Collaborations is only about a factor of two smaller than the ⁷⁶Ge(n,γ)⁷⁷Ge yield due to the larger cross section of the former reaction.

Authors:
; ; ;
Publication Date:
Research Org.:
Duke Univ., Durham, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1197956
Alternate Identifier(s):
OSTI ID: 1193638
Grant/Contract Number:  
FG02-97ER41033; NA0001839
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 741 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; neutron radiative capture; neutron induced background; neutrino detectors; double-beta decay detectors; dark matter detectors

Citation Formats

Bhike, Megha, Fallin, B., Krishichayan,, and Tornow, W. Measurement of the neutron-capture cross section of 76Ge and 74Ge below 15 MeV and its relevance to 0 ν β β decay searches of 76Ge. Netherlands: N. p., 2015. Web. doi:10.1016/j.physletb.2014.12.004.
Bhike, Megha, Fallin, B., Krishichayan,, & Tornow, W. Measurement of the neutron-capture cross section of 76Ge and 74Ge below 15 MeV and its relevance to 0 ν β β decay searches of 76Ge. Netherlands. doi:10.1016/j.physletb.2014.12.004.
Bhike, Megha, Fallin, B., Krishichayan,, and Tornow, W. Sun . "Measurement of the neutron-capture cross section of 76Ge and 74Ge below 15 MeV and its relevance to 0 ν β β decay searches of 76Ge". Netherlands. doi:10.1016/j.physletb.2014.12.004.
@article{osti_1197956,
title = {Measurement of the neutron-capture cross section of 76Ge and 74Ge below 15 MeV and its relevance to 0 ν β β decay searches of 76Ge},
author = {Bhike, Megha and Fallin, B. and Krishichayan, and Tornow, W.},
abstractNote = {The neutron radiative-capture cross section of ⁷⁶Ge was measured between 0.4 and 14.8 MeV using the activation technique. Germanium samples with the isotopic abundance of ~86% ⁷⁶Ge and ~14% ⁷⁴Ge used in the 0νββ searches by the GERDA and Majorana Collaborations were irradiated with monoenergetic neutrons produced at eleven energies via the ³H(p,n)³He, ²H(d,n)³He and ³H(d,n)⁴He reactions. Previously, data existed only at thermal energies and at 14 MeV. As a by-product, capture cross-section data were also obtained for ⁷⁴Ge at neutron energies below 8 MeV. Indium and gold foils were irradiated simultaneously for neutron fluence determination. High-resolution γ-ray spectroscopy was used to determine the γ-ray activity of the daughter nuclei of interest. For the ⁷⁶Ge total capture cross section the present data are in good agreement with the TENDL-2013 model calculations and the ENDF/B-VII.1 evaluations, while for the ⁷⁴Ge(n,γ)⁷⁵Ge reaction, the present data are about a factor of two larger than predicted. It was found that the ⁷⁴Ge(n,γ)⁷⁵Ge yield in the High-Purity Germanium (HPGe) detectors used by the GERDA and Majorana Collaborations is only about a factor of two smaller than the ⁷⁶Ge(n,γ)⁷⁷Ge yield due to the larger cross section of the former reaction.},
doi = {10.1016/j.physletb.2014.12.004},
journal = {Physics Letters B},
number = C,
volume = 741,
place = {Netherlands},
year = {2015},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2014.12.004

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Works referencing / citing this record:

Cosmogenic activation of materials
journal, October 2017


Cosmogenic activation of materials
journal, October 2017