dc.contributor.author | KDK Collaboration | |
dc.date.accessioned | 2023-08-24T06:38:36Z | |
dc.date.available | 2023-08-24T06:38:36Z | |
dc.date.issued | 2023 | |
dc.identifier.citation | KDK Collaboration. (2023). Rare 40K Decay with Implications for Fundamental Physics and Geochronology. <i>Physical Review Letters</i>, <i>131</i>, Article 052503. <a href="https://doi.org/10.1103/PhysRevLett.131.052503" target="_blank">https://doi.org/10.1103/PhysRevLett.131.052503</a> | |
dc.identifier.other | CONVID_184287695 | |
dc.identifier.uri | https://jyx.jyu.fi/handle/123456789/88658 | |
dc.description.abstract | Potassium-40 is a widespread, naturally occurring isotope whose radioactivity impacts subatomic rare-event searches, nuclear structure theory, and estimated geological ages. A predicted electron-capture decay directly to the ground state of argon-40 has never been observed. The KDK (potassium decay) collaboration reports strong evidence of this rare decay mode. A blinded analysis reveals a nonzero ratio of intensities of ground-state electron-captures (IEC0) over excited-state ones (IEC∗) of IEC0/IEC∗=0.0095stat±0.0022sys±0.0010 (68% C.L.), with the null hypothesis rejected at 4σ. In terms of branching ratio, this signal yields IEC0=0.098%stat±0.023%sys±0.010%, roughly half of the commonly used prediction, with consequences for various fields [L. Hariasz et al., companion paper, Phys. Rev. C 108, 014327 (2023)]. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | |
dc.publisher | American Physical Society (APS) | |
dc.relation.ispartofseries | Physical Review Letters | |
dc.rights | In Copyright | |
dc.title | Rare 40K Decay with Implications for Fundamental Physics and Geochronology | |
dc.type | article | |
dc.identifier.urn | URN:NBN:fi:jyu-202308244749 | |
dc.contributor.laitos | Fysiikan laitos | fi |
dc.contributor.laitos | Department of Physics | en |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | |
dc.type.coar | http://purl.org/coar/resource_type/c_2df8fbb1 | |
dc.description.reviewstatus | peerReviewed | |
dc.relation.issn | 0031-9007 | |
dc.relation.volume | 131 | |
dc.type.version | publishedVersion | |
dc.rights.copyright | © 2023 American Physical Society | |
dc.rights.accesslevel | openAccess | fi |
dc.subject.yso | ydinfysiikka | |
dc.subject.yso | geofysiikka | |
dc.subject.yso | hiukkasfysiikka | |
dc.subject.yso | geokronologia | |
dc.format.content | fulltext | |
jyx.subject.uri | http://www.yso.fi/onto/yso/p14759 | |
jyx.subject.uri | http://www.yso.fi/onto/yso/p6800 | |
jyx.subject.uri | http://www.yso.fi/onto/yso/p15576 | |
jyx.subject.uri | http://www.yso.fi/onto/yso/p6832 | |
dc.rights.url | http://rightsstatements.org/page/InC/1.0/?language=en | |
dc.relation.doi | 10.1103/PhysRevLett.131.052503 | |
jyx.fundinginformation | We are grateful to Xavier Mougeot of LNHB for drawing our attention to his latest evaluation of the decay scheme of
40K. Engineering support has been contributed by Miles Constable and Fabrice Rétière of TRIUMF, as well as by Koby Dering through the NSERC/Queen’s MRS. Funding in Canada has been provided by NSERC through SAPIN and SAP RTI grants, as well as by the Faculty of Arts and Science of Queen’s University, and by the McDonald Institute. This work has been partially supported by U.S. DOE. ORNL is managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 for the U.S. Department of Energy. Thermal deposition was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. J. C., L. E. M., and P. R. R. acknowledge support from NSF Grant No. 2102788. U.S. support has also been supplied by the Joint Institute for Nuclear Physics and Applications, and by NSF Grant No. EAR-2102788. This material is based upon work supported by the U.S. Department of Homeland Security. | |
dc.type.okm | A1 | |