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Discovery of radioactive decay of /sup 222/Ra and /sup 224/Ra by /sup 14/C emission

Journal Article · · Phys. Rev. Lett.; (United States)
Using the ISOLDE on-line isotope separator at CERN to produce sources of /sup 221/Fr, /sup 221/Ra, /sup 222/Ra, /sup 223/Ra, and /sup 224/Ra, and using polycarbonate track-recording films sensitive to energetic carbon nuclei but not to alpha particles, we have discovered two new cases of the rare /sup 14/C decay mode: in /sup 222/Ra and /sup 224/Ra. Our results for branching ratios, B, relative to alpha decay are for /sup 221/Fr and /sup 221/Ra, B<4.4 x 10/sup -12/; for /sup 222/Ra, B = (3.7 +- 0.6) x 10/sup -10/; for /sup 223/Ra, B = (6.1 +- 1.0) x 10/sup -10/; for /sup 224/Ra, B = (4.3 +- 1.2) x 10/sup -11/. .AE
Research Organization:
Physics Department, University of California, Berkeley, California
OSTI ID:
5919865
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 54:4; ISSN PRLTA
Country of Publication:
United States
Language:
English

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