NUCLEAR REACTIONS OF TANTALUM WITH 5.7-Gev PROTONS
Radiochemically determined cross sections are reported for sixty-seven of the nuclides which appear as products of the nuclear reactions between 5.7-Bev protons and tantalum, and upper or lower limits are reported for thirty adlitional product nuclides. These data are distributed throughout the range of mass numbers 7 < A < 180. The mass yield distribution obtained from the data ls similar to the distribution reported by Wolfgang et al. for the interactions of 3- Bev protons wit lead, and is consistent with their observatlons that (1) all mass numbers less than that of the target are represented with cross sections of at least a few millibarns; and (2) there is no obvious fission pesk even though a fission peak is clearly seen at lower bombarding energies (0.3 to 0.5 Bev). However, an objective criterion is devised which, when applied to the data, gives a result supporting the view that at least one reaction process other than spallation (presumably fission) is necessary to explain the observed shape of the mass yield distribution. Although for product mass numbers above A approximately 70 most of the measured cross sections represent chain yields'' of neutron-deficient nuclides, it is possible to determine the approximate locus in the N,Z plane of the line of isobaric independent yield maxima, up to A approximately 150. This line is compared with various calculated lines, given in the high-energy nuclear evaporation paper by Dostrovsky, Rabinowitz, and Bivins, in an effort to extract new information on the average excitation energy and neutron deficiency (or excess) of the nuclear evaporation progenitors as functions of the mass number, and on the nuclear state density parameter a. (auth)
- Research Organization:
- Brookhaven National Lab., Upton, N.Y.; Univ. of California, Berkeley
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-021424
- OSTI ID:
- 4815652
- Report Number(s):
- BNL-5867; 0031-899X
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 126; Other Information: BNL-5867. Orig. Receipt Date: 31-DEC-62
- Country of Publication:
- United States
- Language:
- English
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