Intensities of X-Rays and γ Rays in Am 241 Alpha Decay
1957; American Institute of Physics; Volume: 107; Issue: 1 Linguagem: Inglês
10.1103/physrev.107.161
ISSN1536-6065
Autores Tópico(s)Nuclear Physics and Applications
ResumoElectromagnetic radiation intensities from levels of ${\mathrm{Np}}^{237}$ were remeasured with NaI scintillation detectors and an argon proportional chamber. By absolute and coincidence counting the photon intensities per alpha particle are 0.376, 0.025, 0.00073, and 0.359 for the $L$ x-rays and the 26.4-, 43.4-, and 59.6-kev gamma rays, respectively. Gamma rays with 99- and 103-kev energy were found by $\ensuremath{\alpha}\ensuremath{-}\ensuremath{\gamma}$ coincidence. The 99-kev $\ensuremath{\gamma}$ ray is emitted from the 159-kev level with an intensity of 2.3\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$. The 103-kev $\ensuremath{\gamma}$ ray, of intensity 1.9\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ per alpha particle, is a de-excitation of the 103-kev level. The intensity of $L$ x-rays from levels above 59.6 kev is 0.064. Coincidence intensities of 26-kev $\ensuremath{\gamma}$ rays with $L$ x-rays from conversion of the 33.2-kev $\ensuremath{\gamma}$ ray and of $L$ x-rays from these transitions are 0.01 and 0.031 per alpha particle, respectively.
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