Nitrogen Contamination in Elastic Neutron Scattering
نویسندگان
چکیده
Neutron diffraction measurements have been carried out on a single crystal of the iron-based superconductor system SrFe1.92Ni0.08As2. Nitrogen gas sealed in the sample container was found to produce Bragg peaks over a limited range of temperature that were symmetrically positioned around the strongest magnetic Bragg peak in the system, giving the appearance of transition to an incommensurate magnetic state. These peaks were observed on warming but not on cooling, and were identified as structural in origin from the β-phase of solid N2. The details of this spurious scattering are presented.
منابع مشابه
Evaluation of Breast Cancer Radiation Therapy Techniques in Outfield Organs of Rando Phantom with Thermoluminescence Dosimeter
Background: Given the importance of scattered and low doses in secondary cancer caused by radiation treatment, the point dose of critical organs, which were not subjected to radiation treatment in breast cancer radiotherapy, was measured.Objective: The purpose of this study is to evaluate the peripheral dose in two techniques of breast cancer radiotherapy with two energies. Methods: Eight diff...
متن کاملThe influence of neutron contamination on pacemaker in photon beam radiotherapy by LINAC using the Monte Carlo method
Introduction: In radiation therapy with high-energy photon beams (E > 7 MeV) neutrons are generated mainly in LINACs head thorough (γ, n) interactions. These neutrons affect the shielding requirements in radiation therapy rooms. According to the protocol TG-34, photon absorbed dose of 10Gy can cause permanent damage to the pacemaker and the dose of 2Gy can make minor changes in...
متن کاملNeutron skin of Pb in consistency with neutron star observations
The renormalized meson-nucleon couplings are applied to the relativistic optical model of p-208Pb elastic scattering at Tlab = 200MeV. We calculate the strength of the vector potential at nuclear center as varying the neutron radius of 208Pb. The neutron skin thickness Sn is determined in the comparison of the calculated potential with the phenomenological one. We nd a value Sn = 0:118fm being...
متن کاملProton Elastic Scattering and Neutron Distribution of Unstable Nuclei
We study theoretically how we can determine the neutron density distributions of unstable nuclei from proton elastic scattering. We apply the relativistic impulse model to study the sensitivities of the observables to the density distributions which are expressed in Woods-Saxon form. We find that the both radius and diffuseness of densities can be determined from restricted elastic scattering d...
متن کاملOutline of Neutron Scattering Formalism
Neutron scattering formalism is briefly surveyed. Topics touched upon include coherent and incoherent scattering, bound and free cross-sections, the Van Hove formalism, magnetic scattering, elastic scattering, the static approximation, sum rules, small angle scattering, inelastic scattering, thermal diffuse scattering, quasielastic scattering, and neutron optics.
متن کامل