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$\beta$ and $\gamma$-spectroscopy study of $^{119}$Pd and $^{119}$Ag

dc.contributor.authorKURPETA, J.
dc.contributor.authorABRAMUK, A.
dc.contributor.authorRZĄCA-URBAN, T.
dc.contributor.authorURBAN, W.
dc.contributor.authorCANETE, L.
dc.contributor.authorERONEN, T.
dc.contributor.authorGELDHOF, S.
dc.contributor.authorGIERLIK, M.
dc.contributor.authorGREENE, J.P.
dc.contributor.authorJOKINEN, A.
dc.contributor.authorKANKAINEN, A.
dc.contributor.authorMOORE, I.D.
dc.contributor.authorNESTERENKO, D.A.
dc.contributor.authorPENTTILÄ, H.
dc.contributor.authorPOHJALAINEN, I.
dc.contributor.authorREPONEN, M.
dc.contributor.authorRINTA-ANTILA, S.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorDE ROUBIN, A.
hal.structure.identifierLaboratoire de Physique Subatomique et de Cosmologie [LPSC]
dc.contributor.authorSIMPSON, G.S.
dc.contributor.authorSMITH, A.G.
dc.contributor.authorVILÉN, M.
dc.date.issued2022
dc.identifier.issn2469-9985
dc.description.abstractEnNeutron-rich $^{119}$Pd nuclei were produced in fission of natural uranium, induced by 25-MeV protons. Fission fragments swiftly extracted with the Ion Guide Isotope Separation On-Line method were mass separated using a dipole magnet and a Penning trap, providing mono-isotopic samples of $^{119}$Pd. Their $\beta^-$ decay was measured with $\gamma \gamma$- and $\beta \gamma$-spectroscopy methods using low-energy germanium detectors and a thin plastic scintillator. Two distinct nuclear-level structures were observed in $^{119}$Ag, based on the $1/2^-$ and $7/2^+$ isomers reported previously. The $\beta^-$-decay work was complemented by a prompt-γ study of levels in $^{119}$Ag populated in spontaneous fission of $^{252}$Cf, performed using the Gammasphere array of germanium detectors. Contrary to previous suggestions, our data show that the $1/2^-$ isomer is located below the $7/2^+$ isomer and is proposed as a new ground state of $^{119}$Ag with the $7/2^+$ isomer excitation energy determined to be 33.4 keV. Our data indicate that there are two β unstable isomers in $^{119}$Pd, a proposed ground state of $^{119}$Pd with tentative spin $1/2^+$ or $3/2^+$ and a half-life of 0.88 s and the other one about 350 keV above, having spin $(11/2^-)$ and a half-life of 0.85 s. The higher-energy isomer probably decays to the $1/2^+$ or $3/2^+$ ground state via a $\gamma$ cascade comprising 18.7-219.8-X-keV transitions. The unobserved isomeric transition with energy X ≈ 100 keV probably has an E3 multipolarity. Its hindrance factor is significantly lower than for analogous E3 isomeric transitions in lighter Pd isotopes, suggesting an oblate deformation of levels in  $^{119}$Pd. Oblate configurations in  $^{119}$Ag are discussed also.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.title.en$\beta$ and $\gamma$-spectroscopy study of $^{119}$Pd and $^{119}$Ag
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevC.105.034316
dc.subject.halPhysique [physics]/Physique Nucléaire Expérimentale [nucl-ex]
dc.subject.halPhysique [physics]/Physique Nucléaire Théorique [nucl-th]
bordeaux.journalPhysical Review C
bordeaux.page034316
bordeaux.volume105
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-03611560
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03611560v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20C&rft.date=2022&rft.volume=105&rft.issue=3&rft.spage=034316&rft.epage=034316&rft.eissn=2469-9985&rft.issn=2469-9985&rft.au=KURPETA,%20J.&ABRAMUK,%20A.&RZ%C4%84CA-URBAN,%20T.&URBAN,%20W.&CANETE,%20L.&rft.genre=article


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