Decay of Cl39

J. R. Penning, H. R. Maltrud, J. C. Hopkins, and F. H. Schmidt
Phys. Rev. 104, 740 – Published 1 November 1956
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Abstract

The beta- and gamma-ray spectra of 55-minute Cl39 were studied by means of magnetic and scintillation spectrometers. A first forbidden unique (ΔI=2, yes) beta transition takes place to the ground state of A39 in 7±2% of all decays with an end-point energy of 3.45±0.02 Mev and a logft value of 7.8 (logf1t=8.3). Beta transitions to the second excited level of A39 at 1.52 Mev take place in 85±6% of the transitions and have an end-point energy of 1.91±0.02 Mev (logft=5.57). The remaining 8±4% of the beta transitions take place to the first excited level at 1.266 Mev (logft=6.8). Three gamma rays were found with energies of 0.246±0.003, 1.266±0.010, and 1.520±0.010 Mev, and relative intensities of 0.9±0.1, 1, and 0.85±0.05, respectively. The 0.240- and 1.266-Mev gamma rays are in cascade. Each of the three gamma rays is in coincidence with beta rays with end-point energies of 1.90±0.05 Mev. A beta-gamma delay is observed with a half-life of (0.95±0.05)×109 second. The metastable level is shown to be the second excited state. A decay scheme based on these data is proposed.

  • Received 30 July 1956

DOI:https://doi.org/10.1103/PhysRev.104.740

©1956 American Physical Society

Authors & Affiliations

J. R. Penning*, H. R. Maltrud, J. C. Hopkins, and F. H. Schmidt

  • Department of Physics, University of Washington, Seattle, Washington

  • *Now at the Ramo-Wooldridge Corporation, Los Angeles, California.

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Issue

Vol. 104, Iss. 3 — November 1956

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