PHOTODISINTEGRATION OF He$sup 3$

Journal Article · Mon Jan 13 04:00:00 EST 1964 · Physical Review (U.S.) Superseded in part by Phys.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.B117· OSTI ID:4117368

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 between 8.5 and 21.5 Mev by detecting proton-deuteron coincidences in CsI(Tl) scintillators immersed in 1 atm of gas. The source of gamma rays was the bremsstrahlung beam of a 22-Mev betatron. The simultaneous output pulses from the coincidences were displayed on a dual-beam oscilloscope and photographed. The particle energies were determined by pulse- height measurement, and electrons were rejected by pulse-shape analysis. The peak cross section for the He/sup 3/ 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/sr. Gaussian groundstate 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-meansquare 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 proton-proton coincidences in the cases where the angle between the two outgoing protons was near either 90 or 180 deg . (auth)

• Research Organization: Univ. of Illinois, Urbana
• NSA Number: NSA-18-006243
• OSTI ID: 4117368
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 133; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BETATRONS
BREMSSTRAHLUNG
COINCIDENCE METHODS
CONFIGURATION
CROSS SECTIONS
DEUTERONS
ELECTRIC CHARGES
ELECTRONS
ENERGY LEVELS
ENERGY RANGE
GAMMA RADIATION
GAMMA SOURCES
GASES
HELIUM 3
MANY BODY PROBLEM
MEASURED VALUES
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICALS
OSCILLOGRAPHS
PHOTOFISSION
PHOTOGRAPHY
PHOTONS
PHYSICS
PULSES
QUANTUM MECHANICS
SCATTERING
SCINTILLATION COUNTERS