Boutique neutrons advance 40Ar/39Ar geochronology

被引：3

作者：

Rutte, Daniel ^{[1
,2
,6
]}

Renne, Paul R. ^{[1
,2
]}

Morrell, Jonathan ^{[3
]}

Qi, Liqiang ^{[4
,7
]}

Ayllon, Mauricio ^{[3
,5
]}

van Bibber, Karl ^{[3
]}

Wilson, Jonathan ^{[4
]}

Becker, Tim A. ^{[1
]}

Batchelder, Jon ^{[3
]}

Bernstein, Lee A. ^{[3
,5
]}

Lebois, Mathieu ^{[4
]}

James, Jay ^{[3
]}

Chong, Su-Ann ^{[3
,8
]}

Heriot, Will L. ^{[3
]}

Wallace, Max ^{[3
]}

Marcial, Angel ^{[3
]}

Johnson, Charles ^{[3
]}

Woolley, Graham ^{[3
]}

Adams, Parker A. ^{[3
]}

机构：

[1] Berkeley Geochronol Ctr, Berkeley, CA 94709 USA

[2] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

[4] Inst Phys Nucl Orsay, F-91406 Orsay, France

[5] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[6] Univ Bonn, Inst Geowissensch, D-53115 Bonn, Germany

[7] Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[8] Univ Tennessee, Knoxville, TN 37966 USA

来源：

SCIENCE ADVANCES | 2019年 / 5卷 / 09期

关键词：

IRRADIATION; INTERCALIBRATION; AGE; REDETERMINATION; MECHANISMS; STANDARDS; SANIDINE; BIOTITE; GA1550; 39AR;

D O I：

10.1126/sciadv.aaw5526

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We designed and tested a compact deuteron-deuteron fusion neutron generator for application to 40Ar/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 the K-39(n,p)39Ar neutron capture cross section at 1.3 to 3.2 MeV and discovery of a strong resonance at similar to 2.4 MeV illuminate future pathways to improve the technique for 40Ar/39Ar dating.

引用

页数：9

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