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INTERACTION OF HIGH-ENERGY PROTONS AND ALPHA PARTICLES WITH IODINE-127

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
;
Iodine was bombarded with protons ranging in energy from 0.25 to 6.2 Bev and with 0.25-, 0.50-, and 0.72-Bev alpha particles. Reactions of the types (p,pxn), (p,2pxa), (p,p pi /sup +/), (p,p2 pi /sup +/), (p,n pi /sup -/), and ( alpha , alpha xn) to produce i odine, tellurium, antimony, and cesium isotopes were investigated. Upper limits in the range 0.01 to 0.1 mb were found for cross sections of reactions to produce Sb/sup 127/ and Cs/sup 127/. For Te/sup 127/. upper limits in the range of 1 to 2 mb were found. These and other studies of reactions in which the product has the same mass number as that of the target were discussed in terms of the initial interaction. At all incident energies studied, the cross section for the formation of with via the (p,pn) or ( alpha , alpha n) reaction was significantly higher than that of the other (p,pxn) or ( alpha , alpha xn) reactions, with the possible exception of ( alpha , alpha 4n). The (p.pn) and probably the ( alpha , alpha n) reactions appear to be due primarily to knock-on collisions with surface neutrons. The excitation functions for the production of iodine isotopes by proton bombardment decrease between 0.25 and 0.72 Bev but remain relatively constant for higher energies. The (p,2pxn) reactions show a similar effect, but with the excitation functions becoming constant at about 2 Bev. These results are compared with Monte Carlo calculations of the proton-initiated nucleon cascade and of the subsequent evaporation of light particles. (auth)
Research Organization:
Univ. of California, Berkeley
NSA Number:
NSA-14-023615
OSTI ID:
4149097
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Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 119; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ALPHA BEAMS-- ALPHA PARTICLES-- ANTIMONY ISOTOPES-- CESIUM ISOTOPES-- CROSS SECTIONS-- ENERGY RANGE-- EVAPORATION-- EXCITATION-- INTERACTIONS-- IODINE 127-- MASS-- MEASURED VALUES-- MONTE CARLO METHOD-- NEUTRONS-- NUMERICALS-- PROTON BEAMS-- SURFACES-- TARGETS-- TELLURIUM ISOTOPES
ALPHA BEAMS-- ANTIMONY ISOTOPES-- CESIUM ISOTOPES-- CHARGED PART
ALPHA BEAMS-- ANTIMONY ISOTOPES-- CESIUM ISOTOPES-- CHARGED PARTICLES-- CROSS SECTIONS-- ENERGY RANGE-- EVAPORATION-- EXCITATION-- INTERACTIONS-- IODINE 127-- MASS-- MEASURED VALUES-- MONTE CARLO METHOD-- NEUTRONS-- NUMERICALS-- PIONS-- PROTON BEAMS-- PROTONS-- SURFACES-- TARGETS-- TELLURIUM ISOTOPES
PHYSICS