Explanipedia

Structural Fluctuations at Nanoscale and Cooperative Molecular Dynamics in Bulk Water Open

Margarita Russina, Gerrit Günther, B. Farago, Earl Babcock, Zahir Salhi , et al. · 2025

The investigation of cooperative dynamics in H₂O, visible in coherent neutron scattering, has been hindered until now due to the very small signal. Using neutron polarization analysis, we were able, for the first time, to direct…

A Concept of a Para-Hydrogen-Based Cold Neutron Source for Simultaneous High Flux and High Brightness Open

A. Ioffe, Petr Konik, K. E. Batkov · 2025

A novel concept of cold neutron source employing chessboard or staircase assemblies of high-aspect-ratio rectangular para-hydrogen moderators with well-developed and practically fully illuminated surfaces of the individual moderators is pr…

First measurement of neutron birefringence in polarized and nuclei Open

H. Lu, Michael J. Barlow, D. Basler, Philipp Gutfreund, Olaf Holderer , et al. · 2024

We present measurements of polarized neutron birefringence in transmission through nuclear-polarized Xe129 and Xe131 gas and determine the neutron incoherent scattering lengths bi(129Xe)=−0…

A concept of a para-hydrogen-based cold neutron source for simultaneous high flux and high brightness Open

A. Ioffe, Petr Konik, K. E. Batkov · 2023

A novel cold neutron source (CNS) employing chessboard or staircase assemblies of high-aspect ratio rectangular (HARR) para-hydrogen (p-H2) moderators is proposed. It is demonstrated that this design can generate neutron beams with higher …

Precise approach to determining the neutron incoherent scattering length Open

H. Lu, Olaf Holderer, A. Ioffe, Stefano Pasini, Patrick Pistel , et al. · 2023

We report the first results from a new approach for measuring the $^{3}\mathrm{He}$ neutron incoherent scattering length ${b}_{i}$. ${b}_{i}$ is directly proportional to the difference $\mathrm{\ensuremath{\Delta}}b={b}_{+}\ensuremath{-}{b…

Structural fluctuations at nanoscale and cooperative molecular dynamics in bulk water Open

Margarita Russina, Gerrit Günther, B. Farago, Earl Babcock, Zahir Salhi , et al. · 2023

The investigation of cooperative dynamics in H2O, visible in the coherent neutron scattering, has been hindered up to now due to the very small signal. Using a novel approach with employing of neutron polarization analysis we were able for…

in-situ 3He neutron spin filters at JCNS, status and updates Open

Earl Babcock, Zahir Salhi, Artem Feoktystov, L.J. Bannenberg, Steven R. Parnell , et al. · 2023

The JCNS has been developing and using in-situ polarized neutron spin filters for many applications. The system used for analysis on MARIA and polarization for TOPAS were completed about 10 years ago with the MARIA system in standard opera…

A new method to find out the optimal neutron moderator size based on neutron scattering instrument parameters Open

Petr Konik, A. Ioffe · 2023

Simple and fast analytic method to find out optimal combinations of sizes of neutron moderator and optical system entrance, allowing for the full sample illumination with minimum to none background, is developed. In the case of employing l…

7-order enhancement of the Stern-Gerlach effect of neutrons diffracting in a crystal Open

V. V. Voronin, S. Yu. Semenikhin, D. D. Shapiro, Yu. P. Braginets, V. V. Fedorov , et al. · 2020

We measured the spatial splitting of a non-polarized neutron beam passed through a crystal under diffraction conditions in heterogeneous magnetic field (analog to the Stern-Gerlach effect) into two polarized components with opposite polari…

A new neutron depth profiling spectrometer at the JCNS for a focused neutron beam Open

Egor Vezhlev, A. Ioffe, Stefan Mattauch, Simon Staringer, V. Ossovyi , et al. · 2020

© 2020, © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. A new neutron depth profiling (NDP) spectrometer has been designed and built for the use at a high intensity focused cold neutron beam of the…

in-situ 3He SEOP polarizer for Thermal neutrons Open

Zahir Salhi, Earl Babcock, Kendal Bingöl, Klaus Bussmann, H. Kämmerling , et al. · 2019

In this article, we describe a neutron polarizer for a new time-of-flight neutron spectrometer with the polarization analysis TOPAS. This instrument will use the convergent focused incoming beam of thermal neutrons with energies up to 150 …

µ-metal magnetic cavities for polarization and maintenance of polarization of 3He gas Open

Earl Babcock, Zahir Salhi, Lester C. Barnsley, J. Voigt, Stefan Mattauch , et al. · 2019

Low gradient magnetic holding fields are required for maintaining the polarization of polarized 3 He, as diffusion though non-ideal gradients can cause total relaxation rates much greater than the intrinsic total 3 He relaxation rate of a …

The plasma parameters and neutron yield at device of "Plasma focus" Open

А. М. Жукешов, Zh. M. Мoldabekov, A. Ioffe · 2019

Present work presents calculations and experimental studies on the formation and dynamics of plasma onthe “plasma focus” set up. Physical conditions were determined and critical parameters were calculatedfor estimating the neutron yield fo…

Study of Neutron Phase Diffraction Grating at Very High Resolution SANS Diffractometer KWS3 Open

A. Ioffe, Vitaliy Pipich · 2018

The very high resolution focusing SANS diffractometer KWS3, providing the Q-resolution of about 3.8×10 -5 Å -1 at λ=12.8Å, is used for studies of the phase diffraction grating with the rectangular surface relief (the period of 3.3µm) obtai…

The high-intensity reflectometer of the Jülich Centre for Neutron Science: MARIA Open

Stefan Mattauch, Alexandros Koutsioubas, Ulrich Rücker, Denis Korolkov, V. Fracassi , et al. · 2018

MARIA (magnetism reflectometer with high incident angle) is a world class vertical sample reflectometer dedicated to the investigation of thin films in the fields of magnetism, soft matter and biology. The elliptical vertically focusing gu…

Towards wide-angle neutron polarization analysis with a 3He spin filter for TOPAS and NEAT: Testing magic PASTIS on V20 at HZB Open

Earl Babcock, Zahir Salhi, R. R. Gainov, Robin Woracek, Helmut Soltner , et al. · 2018

An XYZ polarization analysis solution has been developed for the new thermal time-of-flight spectrometer TOPAS [1], to be operated in the coming east neutron guide hall at the MLZ. This prototype is currently being prepared to use on NEAT …

Simulation and optimization of a new focusing polarizing bender for the diffuse neutrons scattering spectrometer DNS at MLZ Open

K. S. Nemkovski, A. Ioffe, Yixi Su, Earl Babcock, W. Schweika , et al. · 2017

We present the concept and the results of the simulations of a new polarizer for the diffuse neutron scattering spectrometer DNS at MLZ. The concept of the polarizer is based on the idea of a bender made from the stack of the silicon wafer…

Recent on-beam tests of wide angle neutron polarization analysis with a 3He spin filter: Magic PASTIS on V20 at HZB Open

Earl Babcock, Zahir Salhi, R. R. Gainov, Robin Woracek, Helmut Soltner , et al. · 2017

A complete XYZ polarization analysis solution is under development for the new thermal time of flight spectrometer TOPAS [1], to be operated in the coming east neutron guide hall at the MLZ. Polarization Analysis Studies on a Thermal Inela…

Discussion on data correction for Polarization Analysis with a3He spin filter analyzer Open

Earl Babcock, Zahir Salhi, Emmanuel Kentzinger, Stefan Mattauch, A. Ioffe · 2017

Fully polarized neutron reflectometry and grazing incidence small angle neutron scattering are effective methods to explore magnetic structures on the nm to μm length scales. This paper is an outline of how to fully correct for the polariz…

Expected performance of time-gradient magnetic field SESANS diffractometer at pulsed reactor IBR-2 Open

V. I. Bodnarchuk, V. V. Sadilov, S. A. Manoshin, Raul Victor Erhan, A. Ioffe · 2017

The application of the time-gradient magnetic field neutron spin-echo technique (TGF-NSE) aiming to extend the possibilities of the REFLEX reflectometer at the pulsed reactor IBR-2 (Dubna, Russia) towards a high and medium resolution small…

An ultra-compact in-situ3He polarizer for high Q-range SANS: on-beam test and future upgrades Open

Zahir Salhi, Earl Babcock, Kendal Bingöl, Denis Starostin, Patrick Pistel , et al. · 2017

We present an ultra-compact 3He polarizer to be used as a polarization analyzer for separation of incoherent background for soft matter research. The 3He will be polarized in-situ within a very compact, 18 cm long, magnetic cavity that can…

HERITAGE: the concept of a giant flux neutron reflectometer for the exploration of 3-d structure of free-liquid and solid interfaces in thin films Open

Stefan Mattauch, A. Ioffe, D. Lott, L. Bottyán, Jean Daillant , et al. · 2016

A new fast detection system at the KWS-2 high-intensity SANS diffractometer of the JCNS at MLZ - prototype test Open

Aurel Rădulescu, N. Arend, M. Drochner, A. Ioffe, G. Kemmerling , et al. · 2016

A new detection system based on an array of 3He tubes and innovative fast detection electronics was designed and produced by GE Reuter Stokes for the high-intensity small-angle neutron scattering diffractometer KWS-2, operated by the Jülic…

VERITAS: a high-flux neutron reflectometer with vertical sample geometry for a long pulse spallation source Open

Stefan Mattauch, A. Ioffe, D. Lott, A. Menelle, F. Ott , et al. · 2016

An instrument concept of a reflectometer with a vertical sample geometry fitted to the long pulse structure of a spallation source, called “VERITAS” at the ESS, is presented. It focuses on designing a reflectometer with high intensity at t…

First result from the magic-PASTIS using large3He SEOP-polarized GE180 doughnut cell Open

Zahir Salhi, Earl Babcock, R. R. Gainov, Klaus Bussmann, Hans Kaemmerling , et al. · 2016

We report on the first results of the newly proposed and prototyped PASTIS coil set, enabling for XYZ polarization analysis on the future thermal time-of flight spectrometers. Our setup uses a wide-angle banana shaped 3He Neutron Spin Filt…

SEOP polarized3He Neutron Spin Filters for the JCNS user program Open

Earl Babcock, Zahir Salhi, Tobias Theisselmann, Denis Starostin, J. Schmeissner , et al. · 2016

Over the past several years the JCNS has been developing in-house applications for neutron polarization analysis (PA). These methods include PA for separation of incoherent from coherent scattering in soft matter studies (SANS), and online…

HERITAGE: the concept of a giant flux neutron reflectometer for the exploration of 3-d structure of free-standing and solid interfaces in thin films Open

Stefan Mattauch, A. Ioffe, D. Lott, L. Bottyán, Márton Markó , et al. · 2015

The instrumental concept of HERITAGE - a reflectometer with a horizontal sample geometry - fitted to the long pulse structure of a neutron source is presented. It is dedicated on creating a new class of reflectometers achieving the unprece…

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