Abstract
The absorption of stoppedπ − in181Ta and209Bi has been investigated by studying prompt and delayedγ-ray spectra. Absolute cross-sections for the yield of isotopes per capturedπ − in (π −, xn) reactions, as well as the relative probability of populating nuclear states of different spins have been measured for the hafnium and lead isotopes, respectively. A spin as high as 20 has been observed in the production of204Pb. The ground-state rotational bands of the hafnium isotopes are excited to spin values up to 16. Neutron multiplicities as large as 15 have been observed for both targets. A neutron multiplicity of ≃8 is most probable for both tantalum and bismuth targets.
The strong interaction monopole energy shiftɛ 0 and widthΓ 0 for the 4f level are found to beε 0(181Ta)=540±100eV; ɛ0(209Bi)=1790±150 eV;Γ 0(181Ta)=225±57 eV;Γ 0(209Bi) =1166±70 eV. The quadrupole moments, determined from the hyperfine splitting of the 4f pionic atom level, areQ=3.30±0.06b andQ=}-0.50±0.08b for181Ta and209Bi, respectively.
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On leave from the Institute of Nuclear Physics Research, Amsterdam
This work is part of the research program of the Institute for Nuclear Physics Research (IKO) made possible by financial support from the Foundation for Fundamental Research on Matter (FOM) and the Netherlands Organization for the Advancement of Pure Research (ZWO).
The work was partly supported by the German Federal Ministry for Research and Technology and by the Swiss National Science Foundation.
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Beetz, R., de Boer, F.W.N., Panman, J.K. et al. High spin states and neutron multiplicities after pion capture in181Ta and209Bi. Z Physik A 286, 215–232 (1978). https://doi.org/10.1007/BF01408978
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DOI: https://doi.org/10.1007/BF01408978