ENERGY SPECTRA OF NEUTRONS EMITTED FOLLOWING $pi$$sup -$CAPTURE IN C, Al, Cd, Pb, AND U

Journal Article · Mon Jan 27 00:00:00 EST 1964 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.133.B392· OSTI ID:4108177

Anderson, H L; Hincks, E P; Johnson, C S; Rey, C; Segar, A M

The neutron emission from the capture of stopped mesons( pi /sup -/) in C, Al, Cd, Pb, and U was studied using a time-of-flight detector. The energy spectra are characterized by a low-energy evaporation part, and a high-energy component due to the direct neutron emission. The general features of the direct neutron emission are similar for all the substances studied, with approximately 2 neutrons per pi /sup -/ capture. In contrast, the relative yield of the low- energy component increases markedly in the heavier nuclei. The neutron multiplicities in energy range from about 1.8 to 150 Mev were 2.8 plus or minus 0.3, 3.2 plus or minus 0.3, 3.6 plus or minus 0.4, 3.5 plus or minus 0.4, and 5.0 plus or minus 0.5, for C, Al, Cd, Pb, and U, respectively. The total kinetic energy in neutron emission was about 68, 74, 80, 69, and 100 Mev for C, Al, Cd, Pb, and U, respectively. In the case of Cd the data are sufficiently complete to give a good account of the energy balance. (auth)

• Research Organization: Univ. of Chicago
• NSA Number: NSA-18-007769
• OSTI ID: 4108177
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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: 133; Other Information: Orig. Receipt Date: 31-DEC-64
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

PHYSICS
ALUMINUM
CAPTURE
CARBON
EMISSION
ENERGY
ENERGY LEVELS
ENERGY RANGE
EVAPORATION MODEL
LEAD
MEV RANGE
NEUTRONS
NUCLEAR MODELS
NUCLEI
PIONS
SPECTRA
TIME OF FLIGHT METHOD
URANIUM
VELOCITY