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dc.date.accessioned2019-02-19T13:00:19Z
dc.date.available2019-02-19T13:00:19Z
dc.date.created2016-01-11T15:25:15Z
dc.date.issued2016
dc.identifier.citationGuttormsen, Magne Sveen Larsen, Ann-Cecilie Görgen, Andreas Renstrøm, Therese Siem, Sunniva Tornyi, Tamas Gabor Tveten, Gry Merete . Validity of the Generalized Brink-Axel Hypothesis in Np 238. Physical Review Letters. 2016, 116(1)
dc.identifier.urihttp://hdl.handle.net/10852/66647
dc.description.abstractWe analyze primary γ-ray spectra of the odd-odd 238Np nucleus extracted from 237Npðd; pγÞ238Np coincidence data measured at the Oslo Cyclotron Laboratory. The primary γ spectra cover an excitationenergy region of 0 ≤ Ei ≤ 5.4 MeV, and allow us to perform a detailed study of the γ-ray strength as a function of excitation energy. Hence, we can test the validity of the generalized Brink-Axel hypothesis, which, in its strictest form, claims no excitation-energy dependence on the γ strength. In this work, using the available high-quality 238Np data, we show that the γ-ray strength function is to a very large extent independent of the initial and final states. Thus, for the first time, the generalized Brink-Axel hypothesis is experimentally verified for γ transitions between states in the quasicontinuum region, not only for specific collective resonances, but also for the full strength below the neutron separation energy. Based on our findings, the necessary criteria for the generalized Brink-Axel hypothesis to be fulfilled are outlined.en_US
dc.languageEN
dc.publisherAmerican Physical Society
dc.titleValidity of the Generalized Brink-Axel Hypothesis in Np 238en_US
dc.typeJournal articleen_US
dc.creator.authorGuttormsen, Magne Sveen
dc.creator.authorLarsen, Ann-Cecilie
dc.creator.authorGörgen, Andreas
dc.creator.authorRenstrøm, Therese
dc.creator.authorSiem, Sunniva
dc.creator.authorTornyi, Tamas Gabor
dc.creator.authorTveten, Gry Merete
cristin.unitcode185,15,4,20
cristin.unitnameKjerne- og energifysikk
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2
dc.identifier.cristin1310292
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical Review Letters&rft.volume=116&rft.spage=&rft.date=2016
dc.identifier.jtitlePhysical Review Letters
dc.identifier.volume116
dc.identifier.issue1
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevLett.116.012502
dc.identifier.urnURN:NBN:no-69837
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn0031-9007
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/66647/2/Guttormsen_PhysRevLett.116.012502.pdf
dc.type.versionPublishedVersion
dc.relation.projectNFR/222287


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