Decay Properties of Neutron-Rich Silver Isotopes

Abstract

113 Ag-11 * Ag/Fast ehem. separation /γ-, β-, X-ray-spectroscopy Abstract A fast chemical procedure for the separation of silver from fission products has been developed. Using this procedure the isotopes 113 Ag to 11 * Ag were investigated by y-, β-, and X-ray singles and coincidence measurements. The isotopes were produced by neutron-induced fission of U and 249 Cf, and by Cd(n, p) Ag reactions.

The Q-value and decay properties of114Ag

“…In agreement with previous studies [5,6] only one/~-decaying isomer of ll4Ag, having T1/z =4.5 s, was observed. The beam from the mass separator was collected on a tape of A1 coated Mylar which was used to rapidly transport the collected sources to a position viewed by a Ge(Li) detector.…”

“…The ground state of ~4Ag decays by allowed /?-transitions to both 0 + and 2 § levels in ll4Cd. We can thus confirm the 1 § assignmen* of 114Ag which has been proposed in the earlier studies [5,6] of this decay.…”

“…At higher energies the levels are less well established and the present /?-decay data may give an indication on the completeness of the set of levels found in the reaction work by [2][3][4]. Previous studies [5][6][7] of the decay of ~Ag have had relatively low sensitivity due to difficulties in the preparation of suitable sources.…”

Isomerism, total decay energies, and absolute ?-ray intensities of the heavy Pd and Ag isotopes

“…The presently obtained results, see Table 2, shows that the previous estimate was somewhat low. The intensity of the isomeric transition in 113Ag was given as ~ 80% by Briichle [3,5] as a result of a radiochemical investigation of Pd and Ag nuclei. This value compares well with our direct determination of (64_+ 7)%.…”

“…The electron detector employed presently had a very low efficiency for Ag and Cd K X-rays due to its small thickness of 0.5 mm. We [5] could therefore now perform a successful search for this isomeric transition, see Fig. 2.…”