Publications (19)
Upper Bounds on Parity Violating Gamma-Ray Asymmetries in Compound Nuclei from Polarized Cold Neutron Capture
M. T. Gericke, J. D. Bowman, R. D. Carlini +33
Parity-odd asymmetries in the electromagnetic decays of compound nuclei can sometimes be amplified above values expected from simple dimensional estimates by the complexity of comp…
Absolute He polarimetry for a double-chambered cell using transmission of thermal neutrons
A. Watanabe, K. Sekiguchi, T. Ino +5
We present an absolute He polarimetry method based on thermal neutron transmission for a double-chambered cell. This method utilizes the fact that a He nucleus has a large…
A Current Mode Detector Array for Gamma-Ray Asymmetry Measurements
M. T. Gericke, C. Blessinger, J. D. Bowman +15
We have built a CsI(Tl) gamma-ray detector array for the NPDGamma experiment to search for a small parity-violating directional asymmetry in the angular distribution of 2.2 MeV gam…
Pulsed UCN production using a Doppler shifter at J-PARC
S. Imajo, K. Mishima, M. Kitaguchi +8
We have constructed a Doppler-shifter-type pulsed ultra-cold neutron (UCN) source at the Materials and Life Science Experiment Facility (MLF) of the Japan Proton Accelerator Resear…
Spin dependence in the -wave resonance of
T. Okudaira, R. Nakabe, S. Endo +24
We measured the spin dependence in a neutron-induced -wave resonance by using a polarized epithermal neutron beam and a polarized nuclear target. Our study focuses on the 0.75~e…
Performance of the Fully-equipped Spin Flip Chopper For Neutron Lifetime Experiment at J-PARC
K. Mishima, G. Ichikawa, Y. Fuwa +19
To solve the ''neutron lifetime puzzle,'' where measured neutron lifetimes differ depending on the measurement methods, an experiment with pulsed neutron beam at J-PARC is in progr…
Neutron lifetime measurement with pulsed cold neutrons
K. Hirota, G. Ichikawa, S. Ieki +26
The neutron lifetime has been measured by comparing the decay rate with the reaction rate of He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan…
Improved measurements of neutron lifetime with cold neutron beam at J-PARC
Y. Fuwa, T. Hasegawa, K. Hirota +28
The ``neutron lifetime puzzle'' arises from the discrepancy between neutron lifetime measurements obtained using the beam method, which measures decay products, and the bottle meth…
Transverse asymmetry of rays from neutron-induced compound states of
T. Yamamoto, T. Okudaira, S. Endo +17
A correlation term in the reaction has been studied utilizing epithermal polarized neutrons and germanium…
Improved determination of thermal cross section of 14N(n,p)14C for the neutron lifetime measurement
R. Kitahara, K. Hirota, S. Ieki +21
In a neutron lifetime measurement at the Japan Proton Accelerator Complex, the neutron lifetime is calculated by the neutron decay rate and the incident neutron flux. The flux is o…
Development of co-located Xe and Xe nuclear spin masers with external feedback scheme
T. Sato, Y. Ichikawa, S. Kojima +23
We report on the operation of co-located Xe and Xe nuclear spin masers with an external feedback scheme, and discuss the use of Xe as a comagnetometer…
Precise Neutron Lifetime Measurement Using Pulsed Neutron Beams at J-PARC
N. Sumi, K. Hirota, G. Ichikawa +18
A neutron decays into a proton, an electron, and an anti-neutrino through the beta-decay process. The decay lifetime (880 s) is an important parameter in the weak interaction…
Development of time projection chamber for precise neutron lifetime measurement using pulsed cold neutron beams
Y. Arimoto, N. Higashi, Y. Igarashi +24
A new time projection chamber (TPC) was developed for neutron lifetime measurement using a pulsed cold neutron spallation source at the Japan Proton Accelerator Research Complex (J…
Transverse asymmetry of individual -rays in the La(, )La reaction
M. Okuizumi, C. J. Auton, S. Endo +21
The enhancement of the parity-violating asymmetry in the vicinity of -wave compound nuclear resonances was observed for a variety of medium-heavy nuclei. The enhanced parity-vio…
Measurement of 3He analyzing power for p-3He scattering using the polarized 3He target
A. Watanabe, S. Nakai, K. Sekiguchi +34
Proton-3He scattering is one of the good probes to study the T=3/2 channel of three--nucleon forces. We have measured 3He analyzing powers for p-3He elastic scattering with the pol…
Development and application of a He Neutron Spin Filter at J-PARC
T. Okudaira, T. Oku, T. Ino +22
We are developing a neutron polarizer with polarized He gas, referred to as a He spin filter, based on the Spin Exchange Optical Pumping (SEOP) for polarized neutron scatte…
Proton- elastic scattering at intermediate energies
A. Watanabe, S. Nakai, Y. Wada +42
We present a precise measurement of the cross section, proton and analyzing powers, and spin correlation coefficient for - elastic scattering near…
Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons
S. Endo, R. Abe, H. Fujioka +21
Measurements of circular polarization of -ray emitted from neutron capture reactions provide valuable information for nuclear physics studies. The spin and parity of excited st…
High sensitivity of a future search for P-odd/T-odd interactions on the 0.75 eV -wave resonance in forward transmission determined using pulsed neutron beam
R. Nakabe, C. J. Auton, S. Endo +27
Neutron transmission experiments can offer a new type of highly sensitive search for time-reversal invariance violating (TRIV) effects in nucleon-nucleon interactions via the same…