Measurement of the neutron-capture cross section of 76Ge and 74Ge below 15 MeV and its relevance to 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. https://doi.org/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. https://doi.org/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 = {Sun Feb 01 00:00:00 EST 2015},
month = {Sun Feb 01 00:00:00 EST 2015}
}
https://doi.org/10.1016/j.physletb.2014.12.004
Web of Science
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