A Level-Structure Study of ¹⁰⁸Ag and ¹¹⁰Ag with the (p, nγ) Reactions

Abstract

Properties of excited states in 108 Ag and 110 Ag were studied using the 108 Pd(p, nγ) 108 Ag and 110 Pd(p, nγ) 110 Ag reactions. The low-lying level schemes of 108 Ag and 110 Ag were built from the γ-ray excitation functions. Spins were assigned by comparing the measured γ-ray angular distributions and excitation functions with predictions of the statistical compound-nucleus model. The following spin-parity assignments were obtained for the levels and nuclei indicated: 192.7 keV, 1 + or (2 + ); 206.2 keV, 2 + ; 215.1 keV, 3 + ; 294.5 keV, 2 (+) ; 324.4 keV, 3 + ; 338.4 keV, 3 - and 379.4 keV, 1 - for 108 Ag and 118.7 keV, 3 + ; 191.2 keV, 3; 198.3 keV, 2 and 267.0 keV, (0, 1, 2) for 110 Ag. With the methods of pulsed-beam delayed coincidence and pulsed-beam DPAD, lifetimes and g -factors of isomeric states in both nuclei were measured. The results are T 1/2 =45.8±0.7 ns and g =+1.301±0.011 for the 215.1-keV state of 108 Ag and T 1/2 =36.7±0.7 ns and g =+1.242±0.012 for the 118.7-keV state of 110 Ag.