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Isomerism in Ag and non-yrast levels in Pd and Rh, studied in β decay |
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| Institution: | a St. Petersburg Nuclear Physics Institute, Gatchina 188350, Russia b Gesellschaft für Schwerionenforschung mbH, D-64291, Darmstadt, Germany c Department of Physics, University of Tennessee, Knoxville, TN 37996, USA d Institute of Experimental Physics, Warsaw University, PL-00681, Warsaw, Poland e CEA Saclay, DSM/DAPNIA/SPhN, F-91191, Gif-sur-Yvette Cedex, France f Department of Physics, Queen's University, Kingston, Ontario K7L 3N6, Canada g Universitá “Federico II” and INFN, I-80126, Napoli, Italy h Universitá degli Studi di Milano, I-20133, Milano, Italy i Department of Physics, Florida State University, Tallahassee, FL 32306, USA j Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom k Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf e.V., D-01314, Dresden, Germany l Institute of Nuclear Physics, N.C.S.R., Demokritos, CR-15310, Aghia Paraskevi, Greece |
| Abstract: | The β decay of 96Ag (Z=47,N=49) was investigated by measuring positrons, X rays as well as β-delayed protons and γ rays. The γ radiation was studied by means of germanium detectors and a NaI total-absorption spectrometer. Two β-decaying isomers in 96Ag were established with half-lives of 4.40(6) and 6.9(6) s and tentative spin–parity assignments of (8+) and (2+), respectively. For both isomers, the intensities of β transitions to low-lying levels of 96Pd (Z=46,N=50) and β-delayed proton decays to levels in 95Rh (Z=45,N=50) were measured. Several new 96Pd levels were firmly established. The level energies, their γ decays and the Gamow–Teller decay of 96Ag are compared to shell-model predictions. A new low-lying level in 95Rh was found at 680 keV excitation energy. Through a comparison with low-lying states of N=50 isotones, this level is interpreted as the first excited 7/2+ state built on the proton 9/2+ ground state. The assignments of further excited states in 95Rh are discussed. |
| Keywords: | RADIOACTIVITY 96Ag from 60Ni(40Ca p3n) Measured Eγ Iγ Iβ Ep T1/2 βγ βγγ proton–γ coincidence Deduced level schemes 96Pd 95Rh isomers QEC−Sp value Shell-model calculations |
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