SCATTERING OF 64.3-Mev ALPHA PARTICLES FROM NICKEL-58 AND IRON-58

Journal Article · Mon Apr 13 04:00:00 EST 1964 · Physical Review (U.S.) Superseded in part by Phys.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.134.B42· OSTI ID:4073705

Darriulat, P; Igo, G; Pugh, H G; Meriwether, J M; Yamabe, S

For 64.3-Mev alpha particles the differential cross sections for elastic scattering and excitation of the first 2/sup +/ collective state were measured for the Ni/sup 58/ and Fe/sup 58/ isobars at approximately 0.5 deg intervals between 10 and 82 deg in the center-of-mass system. The measurements were made with sufficient precision to follow the rapid variations and deep minima in the angular distributions, and the data were exhaustively studied for possible errors, an extensive discussion of the uncertainties is given. An analyzed beam (energy spread <100 kev) of high-energy alpha particles was afforded by the Berkeley 88-in. sector-focused cyclotron. The analyzed beam was characterized by high intensity (0.5 mu A), small angular divergence (<0.17 deg ), small beam width (0.06 in.), and by small energy variation during the experiment ( plus or minus 100 kev). A precise scattering chamber (typical tolerance <0.01 deg ) and solid-state detectors with small angular acceptance (0.5 deg ) and sufficient energy resolution (150 kev) were used. No attempt was made to fit the angular distributions in detail but approximate fits to the elastic scattering obtained using an optical potential show: (a) It is not possible to account for the differences observed between the elastic scattering cross sections for the two isobars merely in terms of their different charge or charge distribution. (b) At large angles the elastic scattering from Fe/sup 58/, about half as intense as from Ni/sup 58/, can be qualitatively described by using a deeper absorptive potential for Fe/sup 58/. Analysis of the elastic- and inelastic-scattering cross sections for theta /sub c.m./<50 deg using the smooth cutoff model of Blair, Sharp, and Wilets give the quadrupole deformation parameter BETA as 0.15 (Ni/sup 58/) and 0.17 (Fe/sup 58/). (auth)

• Research Organization: Univ. of California, Berkeley
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-015275
• OSTI ID: 4073705
• Report Number(s): UCRL-11054; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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: 134; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
ALPHA BEAMS
ANGULAR DISTRIBUTION
BLAIR MODEL
CROSS SECTIONS
CRYSTAL COUNTERS
CYCLOTRONS
DEFORMATION
DISTRIBUTION
ELECTRIC CHARGES
ENERGY
ENERGY RANGE
ERRORS
EXCITATION
IRON 58
LENSES
MEASURED VALUES
MEV RANGE
NICKEL 58
NUCLEAR MODELS
OPTICAL MODEL
PARITY
PHYSICS
REACTION KINETICS
RESOLUTION
SCATTERING
SPIN
VARIATIONS