Isomerism in 96Ag and non-yrast levels in 96Pd and 95Rh, studied in β decay

Isomerism in 96Ag and non-yrast levels in 96Pd and 95Rh, studied in β decay

Batist, L.; Döring, J.; Mukha, I.; Plettner, C.; Bingham, C. R.; Borcea, R.; Gierlik, M.; Grawe, H.; Hauschild, K.; Janas, Z.; Johnstone, I. P.; Karny, M.; Kavatsyuk, M.; Kirchner, R.; La Commara, M.; Mazzocchi, C.; Moroz, F.; Pavan, J.; Plochocki, A.; Roeckl, E.; Salvachúa, B.; Schmidt, K.; Schwengner, R.; Skouras, L. D.; Tabor, S. L.; Wiedeking, M.

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; Eγ; Deduced level schemes; Shell-model calculations; 96Pd; 95Rh; isomers; QECSp value; from 60Ni(40Ca p3n); 96Ag; Iγ; Iβ; Ep; T1/2

  • Nuclear Physics A 720(2003)245-273

Publ.-Id: 5566