Electroexcitation of giant multipole resonances in /sup 208/Pb

Journal Article · Sat Jan 01 00:00:00 EST 1977 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.15.217· OSTI ID:7335717

Sasao, M; Torizuka, Y

Electroexcitation of the nuclear continuum for /sup 208/Pb at excitation energies up to 100 MeV has been measured at momentum transfers in the range from 0.45 to 1.2 fm/sup -1/. Unfolding of the radiation tail was performed using a tail function which takes into account the multiple-photon emission effect. The spectra at these momentum transfers deviate significantly from the prediction of the Fermi-gas model but are consistent with the sum of the multipole strengths of the random-phase approximation; the excess cross section on the low excitation energy side indicates the excitation of multipole resonances. A series of /sup 208/Pb spectra at low momentum transfers was expanded into E1, E2 (E0), E3, and higher multipole components using the q dependence of the Tassie model for isoscalar modes and the Goldhaber-Teller or Steinwedel-Jensen model for isovector modes. The giant dipole resonance thus obtained is consistent with that from photoreactions. Isoscalar and isovector giant quadrupole resonances are seen, respectively, at 11 and 22.5 MeV and an octupole resonance at 16 MeV. A monopole resonance is suggested at 13.5 MeV. The reduced < r/sup 2/ >/sup 2/, B (E1), B (E2), and B (E3) consume most of the corresponding energy weighted sum rule if the q dependences of the Tassie and Goldhaber-Teller models are assumed. The results with these models are consistent with the random-phase approximation. (AIP)

• Research Organization: Laboratory of Nuclear Science, Tohoku University, Tomizawa, Sendai, Japan
• OSTI ID: 7335717
• Journal Information: Phys. Rev., C; (United States), Vol. 15:1
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ELECTRON REACTIONS
INELASTIC SCATTERING
LEAD 208
GIANT RESONANCE
LEAD 208 TARGET
DIFFERENTIAL CROSS SECTIONS
ENERGY LEVELS
FERMI GAS MODEL
FORM FACTORS
MEV RANGE 01-10
MEV RANGE 10-100
MULTIPOLES
RANDOM PHASE APPROXIMATION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ENERGY RANGE
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPES
LEAD ISOTOPES
LEPTON REACTIONS
MATHEMATICAL MODELS
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PARTICLE PROPERTIES
RESONANCE
SCATTERING
STABLE ISOTOPES
TARGETS
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