Neutron scattering studies of the even-A tin isotopes
The tin isotopes /sup 116/ /sup 118/ /sup 120/ /sup 122/ /sup 124/Sn make a uniquely interesting set for neutron scattering studies. Because they are proton magic, these isotopes are very similar. Important differences between them are correlated with the neutron excess, (N - Z/A). Differential neutron scattering cross sections at bombarding energies of 1.00, 1.63 and 4.02 MeV, and neutron total cross sections from 0.3 to 5.0 MeV have been measured for >90% enriched samples of these isotopes using the time-of-flight technique. At 1.00 MeV the scattering is all elastic. At 1.63 MeV one inelastic scattering state was excited and detected. At 4.02 MeV, many inelastic scattering channels are open and inelastic scattering was measured up to an excitation energy of about 2.7 MeV. Some of the measurements have been fitted with a spherical optical model plus statistical model. The effect of different parameters in the equation for nuclear radius is explored. The need for channel coupling among the ground state and the 2/sup -/ and 3/sup -/ vibrational states is evident from the 4.0-MeV inelastic scattering from these states. The four data sets were separately analyzed with a model including vibrational coupling. A single coupled channels potential has been derived that fits all the measured cross sections within 2 or 3 standard deviations. In all the analyses, the well depths are dependent on energy and neutron excess. The imaginary well depth neutron excess dependence in all analyses is 3 to 5 times the global value of 12 MeV.
- Research Organization:
- Kentucky Univ., Lexington (USA)
- OSTI ID:
- 6244370
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NEUTRON REACTIONS
SCATTERING
TIN 116
TIN 118
TIN 120
TIN 122
TIN 124
COUPLING
DIFFERENTIAL CROSS SECTIONS
EXPERIMENTAL DATA
MEV RANGE 01-10
MEV RANGE 10-100
OPTICAL MODELS
STATISTICAL MODELS
TOTAL CROSS SECTIONS
BARYON REACTIONS
CROSS SECTIONS
DATA
ENERGY RANGE
EVEN-EVEN NUCLEI
HADRON REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
STABLE ISOTOPES
TIN ISOTOPES
651725* - Nuclear Properties & Reactions
A=90-149
Experimental- Nuclear Reactions & Scattering- (-1987)