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Effects of deformation on neutron total cross sections of even-A Nd and Sm isotopes

Journal Article · · Phys. Rev., C; (United States)
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Neutron total cross sections of /sup 144/Nd and /sup 148/Sm and total cross-section differences for the pairs of isotopes /sup 144,142/Nd, /sup 146,144/Nd, /sup 148,144/Nd, /sup 150,144/Nd, /sup 150,148/Sm, /sup 152,148/Sm, and /sup 154,148/Sm have been measured at 25 energies from 0.75 to 14 MeV. Each sample consisted of about 40 g of powdered oxide with an isotopic enrichment >94%. For each isotopic pair the total cross-section difference was determined directly by measuring the ratio of transmitted flux for matched samples. This difference was found to have an oscillatory behavior when plotted as a function of incident neutron energy. The oscillations have been explained as a deformation effect qualitatively in terms of the nuclear Ramsauer effect and quantitatively using a deformed optical model potential. Adding two neutrons to a nucleus in this mass region was found to have a different effect on the neutron total cross section than adding two protons. A coupled channel analysis was performed using as input data the present total cross sections, low-energy neutron scattering parameters, and elastic and inelastic (2/sup +/) differential cross sections for neutron scattering at 4 and 7 MeV. Excellent total cross-section fits were obtained for the Sm isotopes; however, the total cross-section fits for the Nd isotopes were only fair. Quadrupole deformation parameters have been deduced for all the isotopes studied. The sensitivity of neutron total cross-section differences to this parameter and to the real isospin term of the nuclear potential is discussed.

Research Organization:
Western Michigan University, Kalamazoo, Michigan 49008
OSTI ID:
5000195
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 22:5; ISSN PRVCA
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
CHARGE DISTRIBUTION
COUPLED CHANNEL THEORY
CROSS SECTIONS
DEFORMATION
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ENERGY RANGE
HADRON REACTIONS
INELASTIC SCATTERING
ISOSPIN
ISOTOPES
KEV RANGE
KEV RANGE 100-1000
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEODYMIUM ISOTOPES
NEUTRON REACTIONS
NUCLEAR DEFORMATION
NUCLEAR REACTIONS
NUCLEON REACTIONS
OPTICAL MODELS
PARTICLE PROPERTIES
RARE EARTH ISOTOPES
SAMARIUM ISOTOPES
SCATTERING
TOTAL CROSS SECTIONS