Spin excitations in /sup 48/Ca and /sup 90/Zr with 319 MeV protons

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1984

OSTI ID:5202660

Nanda, S K

Cross sections, analyzing powers, and spin-flip probabilities have been measured in the low momentum transfer region in the /sup 90/Zr(p vector,p' vector)/sup 90/Zr/sup */ reaction at 319 MeV. A rich fine structure is observed for the first time in inelastic proton scattering in the previously proposed M1 giant resonance region. Angular distributions of most of these states are consistent with M1 excitation. The excitation energies of the fine structure states are in good agreement with similar structure seen in electron scattering; however, discrepancies in spin assignments remain. The measured cross section for the entire pump is about 37 +/- 10% of the Distorted Wave Impulse Approximation (DWIA) prediction for the M1 strength in /sup 90/Zr with simple wave functions. However, an analysis of the fine structure states reveals about 15% of the strength in the M1 region to be due to narrow E1 states; another 8% is attributed to M2 strength. Finally, cross section, analyzing power, and spin-flip probability data have also been obtained for the 10.23 MeV M1 transition in the /sup 48/Ca(p vector,p' vector)/sup 48/Ca/sup */ reaction at 319 MeV. The quenching of M1 strength in /sup 48/Ca relative to theoretical predictions is found to be consistent with previous work.

• Research Organization: Rutgers--the State Univ., New Brunswick, NJ (USA)
• OSTI ID: 5202660
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ANALYZING POWER
ANGULAR DISTRIBUTION
BARYON REACTIONS
BARYONS
BEAMS
CALCIUM 48
CALCIUM 48 TARGET
CALCIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FERMIONS
GIANT RESONANCE
HADRON REACTIONS
HADRONS
INELASTIC SCATTERING
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
M1-TRANSITIONS
MEV RANGE
MEV RANGE 100-1000
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
POLARIZED BEAMS
PROTON REACTIONS
PROTONS
RADIOISOTOPES
RESONANCE
SCATTERING
SPIN FLIP
STABLE ISOTOPES
TARGETS
ZIRCONIUM 90
ZIRCONIUM 90 TARGET
ZIRCONIUM ISOTOPES