THE H$sub 2$ BUBBLE CHAMBER USED AS A LOW-ENERGY NEUTRON SPECTROMETER AND THE APPLICATION OF THIS TECHNIQUE TO THE DETERMINATION OF THE PANOFSKY RATIO

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B

OSTI ID:4839027

Pyka, M

A hydrogen bubble chamber was used as a neutron spectrometer for 8.9-Mev radiative neutrons emitted in the capture of pi /sup -/ mesons by protons. These neutrons were detected by observing their recoil protons, and their energy was derived from the angles and ranges of the recoils. The neutron energy spectrum thus obtained exhibited a sharp peak (full-width at half-maximum of ~0.7 Mev) at the correct energy. Two independent techniques were used to subtract background from this peak; they yielded the same result. The absolute detection efficiency was calculated from the known n-p cross-sectton and the dimensions of the chamber by a Monte-Carlo technique. When the net count in the energy peak is corrected by the detection efficiency and compared to total number of pions stopping in the chamber 1.53 plus or minus 0.10 is obtained for the Panofsky ratio. The neutron energy spectrum was analyzed to determine the mass of the pi /sup -/ meson, yielding: m/sup pi -/= (273.0 plus or minus O.8)m/sub e/ The technique may be extended to neutron energies of ~3 Mev. (auth)

• Research Organization: Univ. of Chicago
• NSA Number: NSA-16-020683
• OSTI ID: 4839027
• Journal Information: Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B, Journal Name: Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B Vol. Vol: (10), 23: Suppl. No. 1; ISSN NUCIA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BUBBLE CHAMBERS
CAPTURE
DETECTION
EFFICIENCY
EMISSION
ENERGY LEVELS
ENGINEERING AND EQUIPMENT
HYDROGEN
MONTE CARLO METHOD
NEUTRON SPECTROMETERS
NEUTRONS
NUCLEI
PI MESONS
PIONS
PROTONS
RECOILS
SPECTRA