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REACTION MECHANISMS IN LOW ENERGY INELASTIC PROTON SCATTERING

Journal Article · · Nuclear Phys.
;
A number of (p,p') angular distributions and (p,p' gamma ) angular correlations was measured to investigate the reaction mechanisms in inelastic proton scattering at low energies. Angular distributions were measured at the energies (center-of-mass) indicated: Ar/sup 40/ 6.14 Mev (first, second, and third excited states); Ni/sup 58/ 4.70, 5.64, 6.65-6.80 Mev (first excited state); Ni/sup 60/ 4.69, 5.63, 6.65-6.80 Mev (first excited state); and Cu/sup 65/ 6.83 Mev (second and third excited states). Angular correlations between protons leading to the first excited state and subsequent decay gamma rays were measured for Si/sup 28/, 5.66, 6.70 Mev, theta /sub p'/=45, 90, 135 deg ; S/sup 32/ 5.66 Mev, theta /sub p'/, = 90, 135 deg ; Ti/sup 48/, 5.72, 6.77 Mev, theta /s ub p'/ = 90, 135 deg ; Ni/sup 58/ 5.73, 6.80 Mev, theta /sub p'/ = 45, 90, 135 deg ; Ni/sup 60/ 5.73 Mev, theta /sub p'/ = 50, 90, 135 deg . For the odd- mass nucleus Cu65 the angular distributions show a prominent forward peaking, suggesting the importance of a direct interaction mechanism. For the even nuclei near A = 60, angular distributions and correlations show agreement with the predictions of the statistical compound nucleus model for proton energies less than 6 Mev but indicate an appreciable direct interaction contribution at 7 Mev. Angular correlations for Si/sup 28/ show that direct interactions are important at 5.66 and 6.70 Mev. It appears that the importance of direct interaction relative to compound nucleus contributions increases rapidly as the energy of the incident and emergent protons approaches the height of the Coulomb barrier, though the structure of the nuclear states involved is also important in determining this ratio. (auth)
Research Organization:
Univ. of Rochester, N.Y.
NSA Number:
NSA-16-021393
OSTI ID:
4828081
Report Number(s):
NYO-9751
Journal Information:
Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 32
Country of Publication:
Country unknown/Code not available
Language:
English

References (21)

Direct interaction theory of inelastic scattering journal January 1958
(p, p′γ) Angular Correlations at Low Energy journal June 1960
Coulomb excitation of the first levels of spherical even nuclei by multiply charged ions journal September 1960
Further Studies of Anomalous Inelastic Proton Scattering journal September 1958
Inelastic and Elastic Scattering of 187-Mev Electrons from Selected Even-Even Nuclei journal December 1956
Evidence for the existence of rotational levels in all even nuclei journal January 1961
Si28(p, p′γ)Angular Correlations journal March 1961
Elastic Scattering of 7.5-Mev Protons journal September 1957
The Inelastic Scattering of Neutrons journal July 1952
Direct interaction theory of inelastic scattering journal November 1957
Elastic and Inelastic Scatterings of Protons from Ti, Cr, Ni, Zn, and O at 8 to 14 MeV journal July 1959
Reaction Mechanism in Inelastic Scattering of Protons from Mg, Cr, and Other Elements from 3.5 to 7 Mev journal April 1959
The Analysis of Angular Correlation and Angular Distribution Data journal August 1953
Elastic Scattering of Protons by Vanadium, Chromium, Iron, and Cobalt journal July 1959
Periodicity in ice-flowers journal October 1956
Elastic and Inelastic Scattering of Protons from N, Ne, Mg, Si, S and A in the Energy Range from 7.6 MeV to 14.2 MeV journal May 1960
Rotational spectra of nuclei following O16 journal August 1957
Elastic Scattering of 5.25-Mev Protons from Co, Ni, Cu, and Zn journal June 1956
Angular Distributions from (n, p) Nuclear Reactions journal October 1953
Elastic and Inelastic Scattering of Protons from Nickel Isotopes; Ni58 and Ni60, in the Energy Range from 7.0 MeV to 15.3 MeV journal July 1960
Evidence for Direct Interactions at Low Energy journal April 1959

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Related Subjects

ANGULAR CORRELATION
ANGULAR DISTRIBUTION
ARGON 40
COPPER 65
ENERGY
ENERGY LEVELS
GAMMA RADIATION
INELASTIC SCATTERING
MEASURED VALUES
NICKEL 58
NICKEL 60
PHYSICS
PROTONS
SILICON 28
SULFUR 32
TITANIUM 48
TRANSIENTS