A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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-tekijät tai -toimittajat

Eronen, Tommi
Jokinen, Ari
Kankainen, Anu
Moore, Iain
Nesterenko, Dmitrii
Penttilä, Heikki
Reponen, Mikael
Rinta-Antila, Sami

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Kurpeta, J.; Abramuk, A.; Rząca-Urban, T.; Urban, W.; Canete, L.; Eronen, T.; Geldhof, S.; Gierlik, M.; Greene, J. P.; Jokinen, A.; et al.

Lehti tai sarja: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Julkaisuvuosi: 2022

Ilmestymispäivä: 14.03.2022

Volyymi: 105

Lehden numero: 3

Artikkelinumero: 034316

Kustantaja: American Physical Society (APS)

Julkaisumaa: Yhdysvallat (USA)

Julkaisun kieli: englanti

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

Julkaisun avoin saatavuus: Ei avoin

Julkaisukanavan avoin saatavuus:

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/81204

Tiivistelmä

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.

YSO-asiasanat: ydinfysiikka; palladium

Vapaat asiasanat: beta decay; electromagnetic transitions; isomer decays; nuclear structure and decays; rare and new isotopes

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