The decay scheme of Pb211

Vandenbosch, S. E. ; Baba, C. V. K. ; Christensen, P. R. ; Nielsen, O. B. ; Nordby, H. (1963) The decay scheme of Pb211 Nuclear Physics, 41 . pp. 482-496. ISSN 0029-5582

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The disintegration scheme of the 36.1 min β- emitter Pb211 has been studied by means of a six-gap β-ray spectrometer, scintillation spectrometers, coincidence techniques, directional correlation measurements and lifetime measurements. The β- spectrum of Pb211 has four components with endpoint energies: 1355 keV (92.4%), 951 keV (1.4%), 525 keV (5.5%) and 251 keV (0.7%). The following transitions in Bi211 were observed: 404 keV (55% M1 and 45% E2), 426 keV (M1), 700 keV (M1), 830 keV (M1) and 1104 keV. A decay scheme is proposed with levels in Bi211 at 0 keV (9/2-), 404 keV (7/2-), 830 keV (9/2-) and 1104 keV. The transition energy between Pb211 and Bi211 is 1355 keV. The half life of the 404 keV level is (3.15±0.20)×10-10 sec. The E2 lifetime of the 404 keV level is compared with theoretical estimates. The half life of the 830 keV level is less than 0.9±10-10 sec. In addition it was possible to set an upper limit of 0.6±10-10 sec on the half life of the 351 keV level in Tl207. The levels of Bi211 are discussed in terms of single-proton states or states involving the single proton and two neutrons outside the doubly closed shell.

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