46 citations · 192 across the 17 of their papers we have counts for
6 papers · 1 filter
Neutron scattering cross section of diamond nanoparticle
Kenji Mishima, Toshiya Otomoa, Kazutaka Ikeda +1
Due to their large coherent scattering cross section, diamond nanoparticles (DNPs) are considered as a promising candidate material for a new neutron reflector. For investigation o…
First ultracold neutrons produced at TRIUMF
S. Ahmed, E. Altiere, T. Andalib +50
We installed a source for ultracold neutrons at a new, dedicated spallation target at TRIUMF. The source was originally developed in Japan and uses a superfluid-helium converter co…
Accurate determination of the absolute 3He/4He ratio of a synthesized helium standard gas (Helium Standard of Japan, HESJ): Towards revision of the atmospheric 3He/4He ratio
Kenji Mishima, Hirochika Sumino, Takahito Yamada +4
The helium standard of Japan, referred to as HESJ, is an inter-laboratory standard for the 3He/4He ratio. While the ratio of 3He and 4He of the HESJ was previously determined by a…
A Cold/Ultracold Neutron Detector using Fine-grained Nuclear Emulsion with Spatial Resolution less than 100 nm
N. Naganawa, T. Ariga, S. Awano +9
A new type of cold/ultracold neutron detector that can realize a spatial resolution of less than 100 nm was developed using nuclear emulsion. The detector consists of a fine-graine…
Fundamental physics activities with pulsed neutron at J-PARC(BL05)
Kenji Mishima, Shogo Awano, Yasuhiro Fuwa +37
"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 experiment…
Precise Neutron Lifetime Measurement with a Solenoidal Coil
Naoyuki Sumi, Hidetoshi Otono, Tamaki Yoshioka +2
The neutron lifetime, = 880.2 1.0 sec , is an important parameter for particle physics and cosmology. There is, however, an 8.4 sec (4.0) deviation between the measu…