Recoil studies of nuclear reactions induced by high-energy particles. II. Production of $sup 149$Tb by 1- to 300-GeV protons on $sup 197$Au
The fraction of $sup 149$Tb activity recoiling out of a gold target into the forward (F) and backward (B) directions was determined in irradiations with protons of 1, 3, 11.5, and 300 GeV. The values of F/B decreased from 9.6 at 1 GeV to 2.4 at 300 GeV. The values of 2W (F+B) decreased from 1.24 mg of Au per cm$sup 2$ at 1 GeV to 0.89 mg of Au per cm$sup 2$ at 300 GeV, where W is the thickness of the gold target. These results were analyzed in terms of the standard two-step model for the reaction. The momentum transfer, which occurs in the first step, decreases with the energy of the incident protons. The average kinetic energy of the $sup 149$Tb nuclei in the second step is 3.9+-0.1 MeV for protons in the energy range from 0.7 GeV (earlier work) to 300 GeV. The constancy of this value indicates that the reaction mechanism is essentially unchanged over this range of bombarding energies. (AIP)
- Research Organization:
- Department of Physics, University of Illinois at Chicago Circle, Chicago, Illinois
- NSA Number:
- NSA-33-027711
- OSTI ID:
- 4094100
- Journal Information:
- Phys. Rev., C, v. 13, no. 1, pp. 279-282, Journal Name: Phys. Rev., C, v. 13, no. 1, pp. 279-282; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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TERBIUM 149