Low-temperature irradiation of niobium with 15-MeV neutrons
Niobium was irradiated at 4.2/sup 0/K with high-energy d-Be neutrons to a fluence of 3.7 x 10/sup 15/ n/cm/sup 2/. The neutrons were generated at the Oak Ridge Isochronous Cyclotron by the breakup reaction of 40-MeV deuterons in a thick Be target. The resulting neutron energy spectrum was broadly peaked near 15 MeV. The .012-cm-diameter wire sample (RRR = 200) was situated in a uniform transverse magnetic field. The critical current, flux-flow resistance, and normal-state resistance were measured by using a standard four-terminal technique. The critical-current density and flux-flow resistivity were observed to increase with irradiation and to decrease toward the preirradiation values with subsequent isochronal annealing between 4.2/sup 0/K and 360/sup 0/K. Using recent theories of flux-line-lattice deformation, we deduce the elementary pinning force and compare the result to theoretical calculations.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 7220089
- Report Number(s):
- CONF-770649-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104 -- Metals & Alloys-- Physical Properties
360106* -- Metals & Alloys-- Radiation Effects
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARYONS
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
ELEMENTS
FAST NEUTRONS
FERMIONS
HADRONS
METALS
NEUTRONS
NIOBIUM
NUCLEONS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
REFRACTORY METALS
SUPERCONDUCTIVITY
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE