Cross section and analyzing power measurements for the giant resonance region in /sup 208/Pb with 200-MeV protons

Journal Article · Sun Jun 01 04:00:00 EDT 1986 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.33.1943· OSTI ID:5655926

McDaniels, D K; Tinsley, J R; Lisantti, J; Drake, D M; Bergqvist, I; Swenson, L W; Bertrand, F E; Gross, E E; Horen, D J; Sjoreen, T P

The giant resonance region in /sup 208/Pb has been studied using inelastic scattering of 200-MeV polarized and unpolarized protons. Both differential cross sections sigma(theta) and analyzing power A/sub y/(theta) measurements were made. The isoscalar giant quadrupole resonance at 10.6 +- 0.5 MeV, and the combined isovector giant dipole resonance and isoscalar giant monopole resonance at 14.0 +- 0.6 MeV are clearly observed. Within uncertainties all three giant resonances are in accord with full energy-weighted sum rule depletions, based on comparisons with macroscopic distorted wave Born approximation calculations. Data for a peak at 20.9 +- 1.0 MeV are found to be consistent with an isoscalar giant octupole resonance exhausting 36 +- 12 % of the energy-weighted sum rule strength. A peak located at an excitation energy of 12.0 +- 0.7 MeV is shown to be a 2h..omega.., L = 4 transition depleting 8 +- 3 % of the hexadecapole energy-weighted sum rule strength. The measured reduced transition probability for the 3/sup -/ state at 2.614 MeV is consistent both with the accepted value and with results measured at 334 and 800 MeV. Our results for the 3/sup -/ state at 2.614 MeV and for the giant quadrupole resonance do not support the anomalous behavior found in earlier studies at 104, 156, and 201 MeV. This shows that the macroscopic distorted wave Born approximation can be used to extract deformation lengths providing meaningful comparison with electromagnetic energy-weighted sum rules for proton inelastic scattering to at least 800 MeV incident proton energy.

• Research Organization: University of Oregon, Eugene, Oregon 97403
• OSTI ID: 5655926
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 33:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

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A=190-219
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
ANGULAR MOMENTUM
BARYON REACTIONS
BEAMS
BORN APPROXIMATION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DIPOLE MOMENTS
DWBA
ENERGY LEVELS
ENERGY RANGE
EQUATIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GIANT RESONANCE
HADRON REACTIONS
HEAVY NUCLEI
INELASTIC SCATTERING
INFORMATION
ISOTOPES
LEAD 208
LEAD 208 TARGET
LEAD ISOTOPES
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
PARITY
PARTICLE PROPERTIES
POLARIZED BEAMS
PROBABILITY
PROTON REACTIONS
QUADRUPOLE MOMENTS
RESONANCE
SCATTERING
SPIN
STABLE ISOTOPES
SUM RULES
TARGETS