Possibilities for polarized pulsed neutron instrumentation based on the time-of-flight spin-resonance energy filter

2002 ◽  
Vol 74 (0) ◽  
pp. s1607-s1609 ◽  
Author(s):  
A.A. Parizzi ◽  
W.-T. Lee ◽  
F. Klose
Keyword(s):  
Time Of Flight ◽  
Resonance Energy ◽  
Spin Resonance ◽  
Pulsed Neutron

Modeling the neutron spin-flip process in a time-of-flight spin-resonance energy filter

2002 ◽  
Vol 74 (0) ◽  
pp. s1498-s1501 ◽  
Author(s):  
A.A. Parizzi ◽  
W.-T. Lee ◽  
F. Klose
Keyword(s):  
Time Of Flight ◽  
Resonance Energy ◽  
Neutron Spin ◽  
Spin Flip ◽  
Spin Resonance

Resolution of time-of-flight small-angle neutron diffractometers

1987 ◽  
Vol 20 (4) ◽  
pp. 273-279 ◽  
Author(s):  
R. P. Hjelm
Keyword(s):  
Small Angle ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Time Of Flight ◽  
Simple Method ◽  
Neutron Diffractometer ◽  
Reduction Methods ◽  
Measurement Strategies ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

A simple method of calculating the resolution of small-angle neutron data from diffractometers which use time-of-flight techniques has been derived in terms of the variances of the time and spatial channels of the measurement. The method is used to calculate the resolution in scattering-vector space of scattering intensity from a simulated isotropic scatterer on the small-angle neutron diffractometer at the Intense Pulsed Neutron Source at Argonne National Laboratory. The effects of the various instrumental geometries, time-of-flight measurement strategies and data reduction methods that can be chosen by the experimenter are considered. It is found that the best resolution is obtained with weighted constant Δt/t time-of-flight data acquisition schemes, with the detector placed in the beam in such a way that the highest possible angular range is accessed.

scholarly journals Role of Interactions in the Energy of the Spin Resonance Peak in Fe-Based Superconductors

2019 ◽  
Vol 289 ◽  
pp. 212-217 ◽  
Author(s):  
Yuliya N. Togushova ◽  
Maxim Korshunov
Keyword(s):  
Resonance Energy ◽  
Energy Scale ◽  
Resonance Peak ◽  
Characteristic Energy ◽  
Iron Based Superconductors ◽  
Hubbard Interaction ◽  
First Case ◽  
Spin Resonance ◽  
Spin Response

We consider the spin response within the five-orbital model for iron-based superconductors and study two cases: equal and unequal gaps in different bands. In the first case, the spin resonance peak in the superconducting state appears below the characteristic energy scale determined by the gap magnitude, 2ΔL. In the second case, the energy scale corresponds to the sum of smaller and larger gap magnitudes, ΔL+ΔS. Increasing the values of the Hubbard interaction and the Hund's exchange, we observe a shift of the spin resonance energy to lower frequencies.

Application of Spectroscopic Radiography Using Pulsed Neutron Time-of-Flight Method for Material Characterization

2006 ◽  
Vol 321-323 ◽  
pp. 1663-1666 ◽  
Author(s):  
Yoshiaki Kiyanagi ◽  
Takashi Kamiyama ◽  
Toshiyuki Nagata ◽  
F. Hiraga
Keyword(s):  
Material Characterization ◽  
Time Of Flight ◽  
Neutron Imaging ◽  
Whole Body ◽  
Structure Information ◽  
Transmission Image ◽  
Neutron Time ◽  
The Difference ◽  
Pulsed Neutron ◽  
Time Of Flight Method

Neutron imaging using a pulsed neutron time-of-flight method can give an energy dependent transmission image, namely, spectroscopic image. This image includes the structure information if the sample is coherent scatterer. Here, two examples are introduced. First, we obtained the transmission image of a welded sample of SS304 and 308. Change of the crystal structure depending on the position was observed. Furthermore, we measured spatial dependent transmission of SS samples treated in different ways, surface treatment and whole body treatment. There were almost no spatial dependent change, but the cross section change was found between surface and whole body treatment samples. It was suggested that this might be due to the difference of a grain size. These results demonstrated that the spectroscopic imaging using a pulsed neutron source is a useful tool for material characterization.

scholarly journals Normal-state spin dynamics and temperature-dependent spin-resonance energy in optimally doped BaFe1.85Co0.15As2

2009 ◽  
Vol 6 (3) ◽  
pp. 178-181 ◽  
Author(s):  
D. S. Inosov ◽  
J. T. Park ◽  
P. Bourges ◽  
D. L. Sun ◽  
Y. Sidis ◽  
...  
Keyword(s):  
Normal State ◽  
Spin Dynamics ◽  
Resonance Energy ◽  
Temperature Dependent ◽  
Spin Resonance ◽  
State Spin
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