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dc.contributor.authorKostensalo, Joel
dc.contributor.authorSuhonen, Jouni
dc.contributor.authorVolkmer, Juliane
dc.contributor.authorZatschler, Stefan
dc.contributor.authorZuber, Kai
dc.date.accessioned2021-09-28T11:51:41Z
dc.date.available2021-09-28T11:51:41Z
dc.date.issued2021
dc.identifier.citationKostensalo, J., Suhonen, J., Volkmer, J., Zatschler, S., & Zuber, K. (2021). Confirmation of gA quenching using the revised spectrum-shape method for the analysis of the 113Cd β-decay as measured with the COBRA demonstrator. <i>Physics Letters B</i>, <i>822</i>, Article 136652. <a href="https://doi.org/10.1016/j.physletb.2021.136652" target="_blank">https://doi.org/10.1016/j.physletb.2021.136652</a>
dc.identifier.otherCONVID_101214144
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/77944
dc.description.abstractIn this article we present an updated spectrum-shape analysis of the113Cd fourfold forbidden non-uniqueβ-decay transition in order to address the quenching of the weak axial-vector coupling gA in low-momentum exchange nuclear processes. The experimental data were collected in a dedicated low-threshold run with the COBRA demonstrator at the LNGS and resulted in 44 individual113Cdspectra. These data are evaluated in the context of three nuclear model frameworks based on a revised version of the spectrum-shape method and the conserved vector current hypothesis. The novel idea devised in the present work is to fit the value of the small relativistic nuclear matrix element (s-NME) driving the nuclear model calculations, which remained essentially as a free parameter in previous studies. This is done by tuning the nuclear structure calculations and making use of the interplay of gA and the s-NME such that the experimentally known113Cd half-life gets reproducible by the different frameworks. In this way, a best fit s-NME value can be derived for each of the considered nuclear models, which finally enters the template calculations used to perform the spectrum-shape analysis for each of the obtained113Cd spectra. The primary analysis strategy results in significantly quenched values of the axial-vector coupling for all three nuclear models: gA(ISM)=0.907±0.064,gA(MQPM)=0.993±0.063andgA(IBFM-2)=0.828±0.140. Moreover, with our data-driven approach one of the main shortcomings of the spectrum-shape method has been resolved. This achievement is a milestone in the description of strongly forbiddenβ-decays and adds to the indications for the existence of a quenching of gA in low-momentum exchange nuclear processes.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherElsevier
dc.relation.ispartofseriesPhysics Letters B
dc.rightsCC BY 4.0
dc.subject.other113Cd β-decay
dc.subject.otheraxial-vector coupling
dc.subject.othergA quenching
dc.subject.otherspectrum-shape method
dc.subject.otherCdZnTe
dc.subject.otherCOBRA
dc.titleConfirmation of gA quenching using the revised spectrum-shape method for the analysis of the 113Cd β-decay as measured with the COBRA demonstrator
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202109285011
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.relation.issn0370-2693
dc.relation.volume822
dc.type.versionpublishedVersion
dc.rights.copyright© 2021 The Authors. Published by Elsevier B.V.
dc.rights.accesslevelopenAccessfi
dc.relation.grantnumber318043
dc.subject.ysoydinfysiikka
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p14759
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1016/j.physletb.2021.136652
dc.relation.funderResearch Council of Finlanden
dc.relation.funderSuomen Akatemiafi
jyx.fundingprogramAcademy Project, AoFen
jyx.fundingprogramAkatemiahanke, SAfi
jyx.fundinginformationthe collaboration would like tothank the German Research Foundation (Deutsche Forschungs-gemeinschaft, DFG) for its past funding and the support of theCOBRA XDEM upgrade under the project numbers ZU123/3and GO1133/1. Additionally, the support by the Academy of Finland under the project number 318043 and from the Jennyand Antti Wihuri Foundation is acknowledged.
dc.type.okmA1


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