Rotational excitations in residual nuclei produced by stopped negative pions on targets of 165Ho, 175Lu, 176Lu, 179Hf, and 181Ta

Abstract Reactions produced by stopped negative pions on targets of 165 Ho, 175 Lu, 176 Lu, 179 Hf, and 181 Ta are investigated by measuring photons coincident with the stopped pions. These photons were detected with an 80 cm 3 Ge(Li) detector and identified as pionic X-rays or rotational γ-rays from the residual nuclei. Pion capture is found to result in the excitation of high-spin states. Yields for the residual nuclei are inferred from the observed γ-transitions and compared to calculations based on the exciton model for pre-equilibrium emission followed by particle evaporation. Preliminary results of a pion stop, γn coincidence experiment are presented and compared to the calculations.