Some short-lived isotopes of cerium and praseodymium

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Abstract

The following new β-decay chains of cerium and praseodymium were identified in the fission products of 235U: 147Ce(65 ± 6 sec)-147Pr(12·0 ± 0.5 min) and 148Ce(43 ± 10 sec)-148Pr(1·98 ± 0·10 min). The cerium half-lives were determined by measuring the relative amounts of the praseodymium daughter activities in samples milked from fission product cerium at suitable intervals. The praseodymium half-lives were obtained by direct observation of the decay of the milked samples. Studies of the radiations of 147Pr and 148Pr with β- and γ-scintillation spectrometers indicated total β-decay energies of 2·7 ± 0·2 MeV and 4·5 ± 0·4 MeV, respectively. A partial decay scheme for 147Pr has been proposed.

The mass assignments of 5·98 hr 145Pr and the 12 min 147Pr were substantiated by (γ, p) reactions on enriched 146Nd and 148Nd. Similar irradiations of 150Nd produced some evidence for an ≈ 2·3 min activity attributable to 149Pr.

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    Work performed under the auspices of the U.S. Atomic Energy Commission.

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