Giant electric resonances in /sup 58/Ni studied by alpha particle capture

Journal Article · Sun Jan 01 04:00:00 EST 1978 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.17.56· OSTI ID:5038682

Meyer-Schuetzmeister, L; Segel, R E; Raghunathan, K; Debevec, P T; Wharton, W R; Rutledge, L L; Ophel, T R

The reaction /sup 54/Fe(..cap alpha..,..gamma../sub 0/)/sup 58/Ni has been studied for 7.6 > or = E/sub b/MeV. Seventeen angular distributions have been measured in this energy region making it possible to separate the E2 strength from the E1 strength. The E1 cross section reaches a maximum at about the expected energy. A compact E2 resonance was observed which agrees quite well with the one measured by inelastic ..cap alpha.. scattering, with a peak cross section at about 16 MeV and a width of approx.3 MeV(half width at half maximum). The observed E1 strength equals 0.9% of the isospin allowed E1 sum rule. The measured E2 strength, however, equals 4.3% of the isoscalar E2 sum rule, which is about the same as the fraction of the total E1 strength in /sup 58/Ni excited by proton capture. Assuming only statistical processes and applying the Hauser-Feshbach formula to calculate the total ..gamma.. absorption from the measured particle-capture cross sections leads to the conclusion that the (..cap alpha..,..gamma..) reaction exciting the isoscalar giant quadrupole resonance and the (p,..gamma..) reaction exciting the giant dipole resonance must have direct components.

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 5038682
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 17:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ALPHA REACTIONS
ANGULAR DISTRIBUTION
CAPTURE
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ENERGY RANGE
EQUATIONS
EVEN-EVEN NUCLEI
GAMMA RADIATION
GIANT RESONANCE
HAUSER-FESHBACH THEORY
INELASTIC SCATTERING
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
IRON 54 TARGET
ISOTOPES
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NICKEL 58
NICKEL ISOTOPES
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEI
RADIATIONS
RESONANCE
SCATTERING
STABLE ISOTOPES
SUM RULES
TARGETS