{beta}- and {gamma}-spectroscopy study of {sup 119}Pd and {sup 119}Ag

Kurpeta, J; Abramuk, A.; Rzaca-Urban, T.; Urban, W.; Canete, L.; Eronen, T.; Geldhof, S.; Gierlik, M.; Greene, J. P.; Jokinen, A.

doi:10.1103/PhysRevC.105.034316

Title: {beta}- and {gamma}-spectroscopy study of {sup 119}Pd and {sup 119}Ag

Journal Article · Mon Mar 14 00:00:00 EDT 2022 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.105.034316· OSTI ID:1868953

Kurpeta, J; Abramuk, A.; Rzaca-Urban, T.; Urban, W.; Canete, L.; Eronen, T.; Geldhof, S.; Gierlik, M.; Greene, J. P.; Jokinen, A.

Neutron-rich Pd-119 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 Pd-119. 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 Ag-119, based on the 1/2(-) and 7/2(+) isomers reported previously. The beta(-)decay work was complemented by a prompt-gamma study of levels in Ag-119 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 Ag-119 with the 7/2(+) isomer excitation energy determined to be 33.4 keV. Our data indicate that there are two beta unstable isomers in Pd-119, a proposed ground state of Pd-119 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 approximate to 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 Pd-119. Oblate configurations in Ag-119 are discussed also.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Academy of Finland; European Union - Horizon 2020 Research and Innovation Programme

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1868953

Journal Information:: Physical Review C, Nuclear Physics, Vol. 105, Issue 3

Country of Publication:: United States

Language:: English

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