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Title: Boutique neutrons advance 40 Ar/ 39 Ar geochronology

Abstract

We designed and tested a compact deuteron-deuteron fusion neutron generator for application to40Ar/39Ar geochronology. The nearly monoenergetic neutrons produced for sample irradiation are anticipated to provide several advantages compared with conventional fission spectrum neutrons: Reduction of collateral nuclear reactions increases age accuracy and precision. Irradiation parameters within the neutron generator are more controllable compared with fission reactors. Confidence in the prediction of recoil energies is improved, and their likely reduction potentially broadens applicability of the dating method to fine-grained materials without vacuum encapsulation. Resolution of variation in the39K(n,p)39Ar neutron capture cross section at 1.3 to 3.2 MeV and discovery of a strong resonance at ~2.4 MeV illuminate future pathways to improve the technique for40Ar/39Ar dating.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [2];  [3]; ORCiD logo [5];  [2]; ORCiD logo [2];  [3]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2]; ORCiD logo [2]
  1. Berkeley Geochronology Center, Berkeley, CA 94709, USA; Department of Earth and Planetary Sciences, University of California, Berkeley, Berkeley, CA 94720, USA.
  2. Department of Nuclear Engineering, University of California, Berkeley, Berkeley, CA 94720, USA
  3. Institut de Physique Nucléaire d’Orsay, 91406 Orsay Cedex, France.
  4. Department of Nuclear Engineering, University of California, Berkeley, Berkeley, CA 94720, USA; Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
  5. Berkeley Geochronology Center, Berkeley, CA 94709, USA
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); German Research Foundation (DFG)
OSTI Identifier:
1626014
Grant/Contract Number:  
AC02-05CH11231; EAR-0960138; RU2065/1-1
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 9; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
Science & Technology - Other Topics

Citation Formats

Rutte, Daniel, Renne, Paul R., Morrell, Jonathan, Qi, Liqiang, Ayllon, Mauricio, van Bibber, Karl, Wilson, Jonathan, Becker, Tim A., Batchelder, Jon, Bernstein, Lee A., Lebois, Mathieu, James, Jay, Chong, Su-Ann, Heriot, Will L., Wallace, Max, Marcial, Angel, Johnson, Charles, Woolley, Graham, and Adams, Parker A. Boutique neutrons advance 40 Ar/ 39 Ar geochronology. United States: N. p., 2019. Web. https://doi.org/10.1126/sciadv.aaw5526.
Rutte, Daniel, Renne, Paul R., Morrell, Jonathan, Qi, Liqiang, Ayllon, Mauricio, van Bibber, Karl, Wilson, Jonathan, Becker, Tim A., Batchelder, Jon, Bernstein, Lee A., Lebois, Mathieu, James, Jay, Chong, Su-Ann, Heriot, Will L., Wallace, Max, Marcial, Angel, Johnson, Charles, Woolley, Graham, & Adams, Parker A. Boutique neutrons advance 40 Ar/ 39 Ar geochronology. United States. https://doi.org/10.1126/sciadv.aaw5526
Rutte, Daniel, Renne, Paul R., Morrell, Jonathan, Qi, Liqiang, Ayllon, Mauricio, van Bibber, Karl, Wilson, Jonathan, Becker, Tim A., Batchelder, Jon, Bernstein, Lee A., Lebois, Mathieu, James, Jay, Chong, Su-Ann, Heriot, Will L., Wallace, Max, Marcial, Angel, Johnson, Charles, Woolley, Graham, and Adams, Parker A. Sun . "Boutique neutrons advance 40 Ar/ 39 Ar geochronology". United States. https://doi.org/10.1126/sciadv.aaw5526. https://www.osti.gov/servlets/purl/1626014.
@article{osti_1626014,
title = {Boutique neutrons advance 40 Ar/ 39 Ar geochronology},
author = {Rutte, Daniel and Renne, Paul R. and Morrell, Jonathan and Qi, Liqiang and Ayllon, Mauricio and van Bibber, Karl and Wilson, Jonathan and Becker, Tim A. and Batchelder, Jon and Bernstein, Lee A. and Lebois, Mathieu and James, Jay and Chong, Su-Ann and Heriot, Will L. and Wallace, Max and Marcial, Angel and Johnson, Charles and Woolley, Graham and Adams, Parker A.},
abstractNote = {We designed and tested a compact deuteron-deuteron fusion neutron generator for application to40Ar/39Ar geochronology. The nearly monoenergetic neutrons produced for sample irradiation are anticipated to provide several advantages compared with conventional fission spectrum neutrons: Reduction of collateral nuclear reactions increases age accuracy and precision. Irradiation parameters within the neutron generator are more controllable compared with fission reactors. Confidence in the prediction of recoil energies is improved, and their likely reduction potentially broadens applicability of the dating method to fine-grained materials without vacuum encapsulation. Resolution of variation in the39K(n,p)39Ar neutron capture cross section at 1.3 to 3.2 MeV and discovery of a strong resonance at ~2.4 MeV illuminate future pathways to improve the technique for40Ar/39Ar dating.},
doi = {10.1126/sciadv.aaw5526},
journal = {Science Advances},
number = 9,
volume = 5,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Fig. 1 Fig. 1: Map of the sample holder used for the main HFNG experiment showing determined F values. Dark gray fields are the MDP-1 control samples to monitor production rate variations. Transparent holes are not-available (NA) analyses (NA). ps indicates peak suppression; c, accidental contamination. F values are in sample-specific colorsmore » for ease of orientation. Figure S1 provides a photograph of the actual sample holder.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.