Observation of a new high-spin isomer in {sup 94}Pd

Journal Article · Wed Dec 15 00:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.061309· OSTI ID:21499247

Brock, T S; Nara Singh, B S; Wadsworth, R ^[1]; Boutachkov, P; Gorska, M; Grawe, H; Pietri, S; Domingo-Pardo, C; Caceres, L; Engert, T; Farinon, F; Gerl, J; Goel, N; Kojuharov, I; Kurz, N; Nociforo, C; Prochazka, A; Schaffner, H; Weick, H ^[2]; Braun, N ^[3]

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1. Department of Physics, University of York, York YO10 5DD (United Kingdom)
2. GSI, D-64291 Darmstadt (Germany)
3. IKP, Universitaet zu Koeln, D-50937 Koeln (Germany)

A second {gamma}-decaying high-spin isomeric state, with a half-life of 197(22)ns, has been identified in the N=Z+2 nuclide {sup 94}Pd as part of a stopped-beam Rare Isotope Spectroscopic INvestigation at GSI (RISING) experiment. Weisskopf estimates were used to establish a tentative spin/parity of 19{sup -}, corresponding to the maximum possible spin of a negative parity state in the restricted (p{sub 1/2}, g{sub 9/2}) model space of empirical shell model calculations. The reproduction of the E3 decay properties of the isomer required an extension of the model space to include the f{sub 5/2} and p{sub 3/2} orbitals using the CD-Bonn potential. This is the first time that such an extension has been required for a high-spin isomer in the vicinity of {sup 100}Sn and reveals the importance of such orbits for understanding the decay properties of high-spin isomers in this region. However, despite the need for the extended model space for the E3 decay, the dominant configuration for the 19{sup -} state remains ({pi}p{sub 1/2}{sup -1}g{sub 9/2}{sup -3}){sub 11} x ({nu}g{sub 9/2}{sup -2}){sub 8}. The half-life of the known, 14{sup +}, isomer was remeasured and yielded a value of 499(13) ns.

• OSTI ID: 21499247
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 6; Other Information: DOI: 10.1103/PhysRevC.82.061309; (c) 2010 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BEAMS
CONFIGURATION
GAMMA DECAY
HALF-LIFE
ISOMERS
NANOSECONDS LIVING RADIOISOTOPES
ORBITS
PALLADIUM 94
PARITY
SHELL MODELS
SPIN
TIN 100
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
DECAY
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR DECAY
NUCLEAR MODELS
NUCLEI
PALLADIUM ISOTOPES
PARTICLE PROPERTIES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
TIN ISOTOPES