5 research outputs found
Study of Thin Iron Films for Polarization Analysis of Ultracold Neutrons
The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) collaboration aims to search
for the neutron electric dipole moment (nEDM) with unprecedented precision. One
of the essential elements for the nEDM measurement is a polarization analyzer
of ultracold neutrons (UCNs), whose main component is a magnetized thin iron
film. Several thin iron films were deposited on aluminum and silicon ubstrates
and were characterized by vibrating sample magnetometry and cold-neutron
reflectometry. A magnetic field required to saturate the iron film is 12
kA/m for those on the aluminum substrates and 6.4 kA/m for the silicon
substrates. The magnetic potential of the iron films on the Si substrate was
estimated to be 2 T by the neutron reflectometry, which is sufficient
performance for an UCN polarization analyzer of the nEDM measurement.Comment: Proceedings of the 24th International Spin Symposium (SPIN 2021),
18-22 October 2021, Matsue, Japa
Fundamental physics activities with pulsed neutron at J-PARC(BL05)
"Neutron Optics and Physics (NOP/ BL05)" at MLF in J-PARC is a beamline for
studies of fundamental physics. The beamline is divided into three branches so
that different experiments can be performed in parallel. These beam branches
are being used to develop a variety of new projects. We are developing an
experimental project to measure the neutron lifetime with total uncertainty of
1 s (0.1%). The neutron lifetime is an important parameter in elementary
particle and astrophysics. Thus far, the neutron lifetime has been measured by
several groups; however, different values are obtained from different
measurement methods. This experiment is using a method with different sources
of systematic uncertainty than measurements conducted to date. We are also
developing a source of pulsed ultra-cold neutrons (UCNs) produced from a
Doppler shifter are available at the unpolarized beam branch. We are developing
a time focusing device for UCNs, a so called "rebuncher", which can increase
UCN density from a pulsed UCN source. At the low divergence beam branch, an
experiment to search an unknown intermediate force with nanometer range is
performed by measuring the angular dependence of neutron scattering by noble
gases. Finally the beamline is also used for the research and development of
optical elements and detectors. For example, a position sensitive neutron
detector that uses emulsion to achieve sub-micrometer resolution is currently
under development. We have succeeded in detecting cold and ultra-cold neutrons
using the emulsion detector.Comment: 9 pages, 5 figures, Proceedings of International Conference on
Neutron Optics (NOP2017
The Precision nEDM Measurement with UltraCold Neutrons at TRIUMF
The TRIUMF Ultra-Cold Advanced Neutron (TUCAN) collaboration aims at a
precision neutron electric dipole moment (nEDM) measurement with an uncertainty
of , which is an order-of-magnitude better than
the current nEDM upper limit and enables us to test Supersymmetry. To achieve
this precision, we are developing a new high-intensity ultracold neutron (UCN)
source using super-thermal UCN production in superfluid helium (He-II) and a
nEDM spectrometer. The current development status of them is reported in this
article.Comment: Proceedings of the 24th International Spin Symposium (SPIN 2021),
18-22 October 2021, Matsue, Japa
Design and Construction of an Imaging beamline at the Nagoya University Neutron Source
The Nagoya University Accelerator driven Neutron Source (NUANS) is constructed at the main campus of the Nagoya University. The electrostatic accelerator is used with the maximum proton energy and intensity of 2.8MeV, 15mA(42kW) respectively. Two neutron beamlines are designed at NUANS. The BL1 is dedicated to BNCT development. The BL2 is designed for research and development for neutron devices and neutron imaging. The neutrons used for the BL2 are generated by using the (p, n) reaction from a thin beryllium target. We constructed a compact target station for the BL2 and measured the neutron transmission image