A method of magnetic storage of ultra-cold neutrons for a precise measurement of the neutron lifetime

1999 ◽  
Vol 26 (1) ◽  
pp. 67-77 ◽  
Author(s):  
O Zimmer
Keyword(s):  
Precise Measurement ◽  
Magnetic Storage ◽  
Neutron Lifetime ◽  
Cold Neutrons

Magnetic storage of UCN for a measurement of the neutron lifetime

2009 ◽  
Vol 611 (2-3) ◽  
pp. 167-170 ◽  
Author(s):  
V.F. Ezhov ◽  
A.Z. Andreev ◽  
G. Ban ◽  
B.A. Bazarov ◽  
P. Geltenbort ◽  
...  
Keyword(s):  
Magnetic Storage ◽  
Neutron Lifetime

Neutron lifetime measured by monitored storing of ultra-cold neutrons

2000 ◽  
Vol 440 (3) ◽  
pp. 511-516 ◽  
Author(s):  
S. Arzumanov ◽  
L. Bondarenko ◽  
S. Chernyavsky ◽  
W. Drexel ◽  
A. Fomin ◽  
...  
Keyword(s):  
Neutron Lifetime ◽  
Cold Neutrons

Using Pulsed Cold Neutrons to Measure Neutron Lifetime

2021 ◽  
Vol 1 ◽  
Keyword(s):  
Neutron Lifetime ◽  
Cold Neutrons ◽  
Neutron Beams ◽  
Pulsed Neutron

Scientists measure the lifetime of a neutron with pulsed neutron beams to explore the cause of a puzzling discrepancy in their previously measured lifetime.

scholarly journals New search for mirror neutron regeneration

2019 ◽  
Vol 219 ◽  
pp. 07002
Author(s):  
L.J. Broussard ◽  
K.M. Bailey ◽  
W.B. Bailey ◽  
J.L. Barrow ◽  
K. Berry ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
National Laboratory ◽  
General Purpose ◽  
High Flux ◽  
Neutron Lifetime ◽  
Neutron State ◽  
Oak Ridge ◽  
Cold Neutrons

The possibility of relatively fast neutron oscillations into a mirror neutron state is not excluded experimentally when a mirror magnetic field is considered. Direct searches for the disappearance of neutrons into mirror neutrons in a controlled magnetic field have previously been performed using ultracold neutrons, with some anomalous results reported. We describe a technique using cold neutrons to perform a disappearance and regeneration search, which would allow us to unambiguously identify a possible oscillation signal. An experiment using the existing General Purpose-Small Angle Neutron Scattering instrument at the High Flux Isotope Reactor at Oak Ridge National Laboratory will have the sensitivity to fully explore the parameter space of prior ultracold neutron searches and confirm or refute previous claims of observation. This instrument can also conclusively test the validity of recently suggested oscillation-based explanations for the neutron lifetime anomaly.

scholarly journals Neutron lifetime measurement with pulsed cold neutrons

2020 ◽  
Author(s):  
K Hirota ◽  
G Ichikawa ◽  
S Ieki ◽  
T Ino ◽  
Y Iwashita ◽  
...  
Keyword(s):  
Decay Rate ◽  
Reaction Rate ◽  
Proton Accelerator ◽  
Neutron Decay ◽  
Spallation Neutron Source ◽  
Neutron Lifetime ◽  
Cold Neutrons ◽  
Research Complex ◽  
Gas Chamber ◽  
Pulsed Neutron

Abstract The neutron lifetime has been measured by comparing the decay rate with the reaction rate of 3He nuclei of a pulsed neutron beam from the spallation neutron source at the Japan Proton Accelerator Research Complex (J-PARC). The decay rate and the reaction rate were determined by simultaneously detecting electrons from the neutron decay and protons from the 3He(n, p) 3H reaction using a gas chamber of which working gas contains diluted 3He. The measured neutron lifetime was 898 ± 10stat+15−18sys s.

scholarly journals New project for precise neutron lifetime measurement at J-PARC

2019 ◽  
Vol 219 ◽  
pp. 03003 ◽  
Author(s):  
Naoki Nagakura ◽  
Katsuya Hirota ◽  
Sei Ieki ◽  
Takashi Ino ◽  
Yoshihisa Iwashita ◽  
...  
Keyword(s):  
Big Bang ◽  
Proton Accelerator ◽  
Neutron Lifetime ◽  
Big Bang Nucleosynthesis ◽  
Cold Neutrons ◽  
Beam Experiment ◽  
Research Complex ◽  
Time Projection ◽  
Beta Decays

The decay lifetime of free neutrons (∼880 s) is an important parameter of the weak interaction and for Big Bang Nucleosynthesis. However, results of measurements currently show discrepancies depending on the method used. As most experiments nowadays employ ultra cold neutrons, we have developed a new cold-beam experiment which we perform at the Japan Proton Accelerator Research Complex. As a special feature, a polarized neutron beam is bunched by a spin flip chopper. A time projection chamber operated with He and CO2 gas, including a well-controlled amount of 3He, is used for detection of the beta-decays and simultaneous determination of the beam intensity. Using the data between 2014 and 2016, we evaluated our first, preliminary result of the neutron lifetime as 896 ± 10(stat.) −10+14(sys.) s. We plan several upgrades to achieve our precision goal of 1 s.

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