2 results listed
Nuclear fusion energy, as the world's primary
energy source, may be among the strongest sustainable ways
to replace fossil fuels. Nuclear fusion is able to supply
considerable amounts of energy over millions of years. The
high temperature and intensive radiation in a nuclear fusion
reactor can cause damage to the structural materials. Thus,
the design and structural material selection of fusion reactors
are very important. Nuclear materials can be broadly
categorized into nuclear fuels and structural materials.
Structural materials play vital role in the economics of the
nuclear power plant. Iron is obviously one of the most
common elements in the structural materials in nuclear
technology applications. Iron also is one of the most
important materials in experimental accelerator facilities,
many evaluations go beyond 20 MeV. Natural iron (natFe) and
56Fe are among the best measured materials. Many
measurements exist for the natural element, as well as for the
major isotopic constituent Fe-56 (91.8% of natural iron),
which is the main element for steel alloys. Steel is a commonly
used structural material for many nuclear applications such
as reactor pressure vessels that serves as the primary
containment for the nuclear fuel. We have considered minor
iron isotopes Fe-54 (5.8%), Fe-57 (2.1%), and Fe-58 (0.3%).
The cross sections of nuclear reactions induced by nucleons
are required for the design calculations in fusion reactors and
other related investigations, such as fusion, fission,
accelerator-driven applications, dosimetry, and nuclear
medical applications. In this study, the total cross sections
values for natFe(n,tot) and 54,56-58Fe(n,tot) nuclear reactions
were calculated with TALYS code and were later compared
with the available experimental cross section data reported in
the literature.
International Iron & Steel Symposium
UDCS
Necla Çakmak
Rıdvan Baldık
The contribution of neutron scattering to progress
in the physics of magnetism is very large and important,
especially its contribution to the understanding of magnetism
in metals. The spin wave dispersion relations of Fe and Ni were
measured by neutron scattering techniques, around 1970 and
the results were in good agreement with the band theory based
on a generalized random phase approximation (RPA).
Therefore, band theory can explain the magnetism in metals
not only for the ground state but also for the excited states.
Otherwise, the high strength and hardness properties, cobaltbased alloys have been used as structural materials in nuclear
reactors and activated cobalt materials in corrosion products
are significant in determination of dose levels during
maintenance after a coolant leak at a nuclear fusion reactor.
In this study, we have been investigated some nuclear and
magnetic properties of Fe-Co and Co-Ni alloys. Magnetic
behaviours of these alloys can be investigated by Monte Carlo
simulations for different and predefined exchange energies or
coupling strengths. For ferromagnetic interactions,
magnetization and susceptibility curves of the alloys have been
computed with Monte Carlo method based on classical
Heisenberg model. Magnetic characters of these type of alloys
can be reached by neutron scattering experiments as well. The
cross sections values for 59Co(n,p)59Fe and 59Co(p,n)59Ni
nuclear reactions have been calculated with TALYS code and
have been compared with the available experimental cross
section data reported in the literature. Also, the half-lives of
these transitions have been calculated in the proton-neutron
Quasi Particle Random Phase Approximation (pn-QRPA)
framework. The obtained results are compared with the
experimental data and the other theoretical values.
International Iron & Steel Symposium
UDCS
Necla Çakmak
Rıdvan Baldık
Ulvi Kanbur