ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01408978
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