SECONDARY REACTIONS OF ASTATINE PRODUCTION DURING BOMBARDMENT OF Bi AND Pb WITH 3 TO 10 Bev PROTONS (in Russian)
The cross sections for At/sup 211/ production by 3-, 6-, and 10-Bev proton bombardments of bismuth and lead are determined by a radiochemical method. For bismuth the cross sections are (1.5 plus or minus 0.5), (2.0 plus or minus 0.6), and (1.0 plus or minus 0.3) x 10/sup -28/ cm/sup 2/ and for lead (3.3 plus or minus 1.0, (5.0 plus or minus 1.5), and (10 plus or minus 4) x 10/sup -30/ cm/sup 2/, respectively. Yields of the isotopes At/sup 210/ At/ sup 2 At/sup 208/, and At/sup 207/ from bismuth with respect to the At/sup 211/ yield at 10 Bev are determined by measuring the alpha -spectra. The relative yields are 1.2 plus or minus 0.72, 0.88 plus or minus 0.08, 0.89 plus or minus 0.47, and 0.53 plus or minus 0.04 respectively. The At/sup 209/ and At/ sup 207/ yields relative to the At/sup 211/ yield in lead at the same proton energy are 1.87 plus or minus 0.22 and 0.98 plus or minus 0.08. The data obtained are compared with the cross sections for At/sup 211/ production and the relative yields of light astatine isotopes produced by bombarding the same targets with protons of smaller energies and also with other data on the fragmentation process. (auth)
- Research Organization:
- Joint Inst. for Nuclear Research, Dubna, USSR
- NSA Number:
- NSA-18-006255
- OSTI ID:
- 4117286
- Journal Information:
- Zh. Eksperim. i Teor. Fiz., Journal Name: Zh. Eksperim. i Teor. Fiz. Vol. Vol: 45
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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