Study of the energy levels of 203Tl Using (γ,γ′) reaction

R. Moreh, A. Nof, A. Wolf

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20 Scopus citations


Elastic and inelastic nuclear resonant scattering of monochromatic photons from 203Tl has been studied using a 20-cc Ge(Li) detector. The γ source was obtained from thermal-neutron capture in titanium. The scattering isotope was identified by using an isotopically enriched thallium target. The energy of the resonance level in 203Tl was found to be 6.418 MeV. Assuming the high-energy lines to be primary transitions deexciting the resonance level, some 14 energy levels were found from the ground state up to 2.9 MeV, 4 of which may be identified with recently reported levels. By measuring the angular distribution of the scattered radiation, the spin of the 6.418-MeV level was determined to be 1/2, and thus, based on the assumption of dipole transitions, the spins of several low-lying levels were found to be either 1/2 or 3/2. The total radiative width of the resonance level was determined and found to be Γγ=0.32±0.06 eV and Γ0/Γγ=0.026. The spectral shape of scattered radiation was found to have a strong intensity bump at about 5 MeV; this is discussed in the light of similar bumps obtained in (n,γ) and (d,pγ) reactions on nuclei in the same mass region.

Original languageEnglish
Pages (from-to)249-255
Number of pages7
JournalPhysical Review C - Nuclear Physics
Issue number1
StatePublished - 1 Jan 1970
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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