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THE CROSS-SECTION OF THE REACTION Al$sup 27$(p,3pn)Na$sup 24$ AT 590 MeV

Technical Report ·
OSTI ID:4195152
;
A method of determining the absolute cross section of the Al/sup 27/ (p,3pn)Na/sup 24/ reaction is considered. Using a calibrated ion chamber, the sensitivity of a secondary emission chamber was determined. The SE chamber monitored a well focussed proton beam of defined energy (590 Mev) which at the same time passed through an aluminium target. The Na/sup 24/ activity induced by the proton bombardment of the aluminum foil was measured withh counters of well defined counting efficiency. A cross section of 11.0 plus or minus 0.5 mb was measured. This value fits exactly those already known for 350 Mev (11.1 plus or minus 0.9 mb) and 2 Bev (10.4 plus or minus 0.6 mb) or 3 Bev (10.0 plus or minus 0.6 mb). According to the figures the excitation curve of the Al/sup 27/ (p,3pn)Na/sup 24/ reaction may be considered, either as a slowly decreasing function of the energy, or even to be constant in the range from 0.4 to 3.0 Bev. (auth)
Research Organization:
European Organization for Nuclear Research, Geneva
NSA Number:
NSA-14-012203
OSTI ID:
4195152
Report Number(s):
CERN-60-3
Country of Publication:
Switzerland
Language:
English

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Related Subjects

ALUMINUM 27
COUNTERS
CROSS SECTIONS
EFFICIENCY
ENERGY
ENERGY RANGE
EXCITATION
FOILS
IONIZATION CHAMBERS
MEASURED VALUES
MONITORING
NEUTRONS
NUCLEAR REACTIONS
PHYSICS
PROTON BEAMS
PROTONS
RADIOACTIVITY
SENSITIVITY
SODIUM 24
STANDARDS
TARGETS