A1 Journal article (refereed)
β- and γ-spectroscopy study of 119Pd and 119Ag (2022)

Kurpeta, J., Abramuk, A., Rząca-Urban, T., Urban, W., Canete, L., Eronen, T., Geldhof, S., Gierlik, M., Greene, J. P., Jokinen, A., Kankainen, A., Moore, I. D., Nesterenko, D. A., Penttilä, H., Pohjalainen, I., Reponen, M., Rinta-Antila, S., de Roubin, A., Simpson, G. S., . . . Vilén, M. (2022). β- and γ-spectroscopy study of 119Pd and 119Ag. Physical Review C, 105(3), Article 034316. https://doi.org/10.1103/PhysRevC.105.034316

JYU authors or editors

Publication details

All authors or editors: Kurpeta, J.; Abramuk, A.; Rząca-Urban, T.; Urban, W.; Canete, L.; Eronen, T.; Geldhof, S.; Gierlik, M.; Greene, J. P.; Jokinen, A.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2022

Publication date: 14/03/2022

Volume: 105

Issue number: 3

Article number: 034316

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.105.034316

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/81204

Abstract

Neutron-rich 119Pd 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 119Pd. Their β− decay was measured with γγ- and βγ-spectroscopy methods using low-energy germanium detectors and a thin plastic scintillator. Two distinct nuclear-level structures were observed in 119Ag, based on the 1/2− and 7/2+ isomers reported previously. The β−-decay work was complemented by a prompt-γ study of levels in 119Ag populated in spontaneous fission of 252Cf, 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 119Ag with the 7/2+ isomer excitation energy determined to be 33.4 keV. Our data indicate that there are two β unstable isomers in 119Pd, a proposed ground state of 119Pd 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 γ 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 119Pd. Oblate configurations in 119Ag are discussed also.

Keywords: nuclear physics; palladium

Free keywords: beta decay; electromagnetic transitions; isomer decays; nuclear structure and decays; rare and new isotopes

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Ministry reporting: Yes

VIRTA submission year: 2022

JUFO rating: 2