Performance of the Full-equipped Spin Flip Chopper For Neutron Lifetime Experiment at J-PARC
arxiv(2023)
摘要
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 progress. In this experiment, neutrons are bunched into
40-cm lengths using a spin flip chopper (SFC), where the statistical
sensitivity was limited by the aperture size of the SFC. The SFC comprises
three sets of magnetic supermirrors and two resonant spin flippers. In this
paper, we discuss an upgrade to enlarge the apertures of the SFC. The improved
SFC achieved a signal-to-noise ratio of 250--400, which is comparable to the
previous one. The statistics per unit time of the neutron lifetime experiment
increased 2.8 times with the upgrade. Consequently, the time required to reach
an accuracy of 1~s in the neutron lifetime experiment was reduced from 590 to
170~days, which is a significant reduction in time. This improvement in
statistical accuracy will also contribute to the reduction of systematic
uncertainties, such as background evaluation, fostering further advancements in
the neutron lifetime experiments at J-PARC.
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