EXPERIMENTAL STUDY OF He$sup 3$ PHOTODISINTEGRATION. Technical Report No. 45

Technical Report · Mon Jul 01 04:00:00 EDT 1963

OSTI ID:4626907

Berman, B L; Koester, Jr, L J; Smith, J H

The 90 deg photodisintegration cross sections for He/ sup 3/ were measured for incident photon energies betweert 8.5 and 21.5 Mev by detecting proton-deuteron coincidences in CsI(Tl) scintillators immersed in 1 atm of gas. The peak cross section for the He/sup 9/( gamma ,p)d reaction, which is very sensitive to the nuclear size, occurs at 10.8 plus or minus 0.3 Mev and equals 0.092 plus or minus 0.004 mb/ster. Gaussian ground state wave functions for He/ sup 3/ fail to predict the shape of the cross section curve. The modified exponential wave function of Gunn and Irving gives a good fit for a root-mean- square nuclear radius of 1.94 F (corresponding to a charge radius of 2.1 F). The He/sup 3/ charge form factor calculated with this wave function agrees very well with the electron scattering measurements of Collard and Hofstadter for small momentum transfers q and deviates by 20% only at q/sup 2/ = 5 F/sup -2/. Also, some information was acquired about the competing three-body photodisintegration process by detecting p-p coincidences in the case where the angle between the two outgoing protons was near either 90 deg or 180 deg . 48 references. (auth)

• Research Organization: Illinois. Univ., Urbana
• NSA Number: NSA-17-039977
• OSTI ID: 4626907
• Report Number(s): NP-13113
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
COINCIDENCE METHODS
CROSS SECTIONS
DETECTION
DEUTERONS
ELECTRIC CHARGES
ENERGY
ENERGY LEVELS
GAMMA RADIATION
GASES
HELIUM 3
MEASURED VALUES
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
PHOTOFISSION
PHOTONS
PHYSICS
PRESSURE
PROTONS
QUANTUM MECHANICS
SCINTILLATION COUNTERS
SENSITIVITY