MEASUREMENT OF THE HALF LIFE OF THE FIRST EXCITED STATE OF F$sup 19$ BY THE METHOD OF DELAYED COINCIDENCES (in Spanish)
The lifetime of the first excited state of F/sup 19/ was measured by the method of delayed coincidences. The prompt coincidence curve was obtained with an Al/sup 27/ target. The Fig target was prepared by evaporation of lead fluoride on tantalum backing. A B/sup 10/ turget was also used to test and calibrate the equipment. The lifetime of the first excited state of B/sup 10/ was measured several times and these results agreed satisfactorily. Therefore, the B/sup 10/ lifetime of 1 x 10/sup -9/ sec was as a calibration standard for the time axis, the observed shift of the centroid of the delayed coincidence curve corresponds to this value. The F/sup 19/ targets were bombarded with 1.5- Mev protons, and a shift corresponding to a lifetime of (0.87 plus or minus 0.14) x 10/sup -9/ sec was obtained. This measurement seems to be somewhat lower than previously reported values, and the present standard deviation is also smaller. (auth)
- Research Organization:
- Universidad Nacional de Mexico
- NSA Number:
- NSA-17-031538
- OSTI ID:
- 4685962
- Journal Information:
- Revista Mexicana de Fisica (Mexico), Vol. Vol: 12; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- Spanish
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