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Radiative electron capture in the second forbidden decay of 137La

✍ Scribed by M. Pfützner; P. Hornshøj; H.L. Nielsen; J. Kurpeta; A. Płochocki

Book ID
104336173
Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
539 KB
Volume
611
Category
Article
ISSN
0375-9474

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✦ Synopsis

The Radiative Electron Capture (REC) decay of 137La has been studied. The absolute intensity as well as the shape has been measured for both the total and the 1S component of the photon spectrum. An analysis shows that the standard theory of internal bremsstrahlung can account for the present experiments. No compelling evidence is found for the contribution of detour transitions, contrary to the situation in the previously studied cases. A second forbidden unique EC-branch to an excited state at 283.6 + 0.1 keV in 137Ba, intensity of (6.8 d: 0.4) x 10 -7 per decay, log f~t = 14.6, has been discovered.

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✍ J. Kurcewicz; M. Pfützner; P. Hornshøj; H.L. Nielsen; B. Szweryn 📂 Article 📅 2003 🏛 Elsevier Science 🌐 English ⚖ 212 KB

The photon spectrum accompanying 1S electron capture in the first forbidden unique decay of 204 Tl was measured. The total radiation intensity in the energy range from 100 keV to the spectrum end-point was found to be 2.8(2) × 10 -5 per K-capture, confirming a previously reported strong disagreement