English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The puzzle remains in the large discrepancy between neutron lifetime measuredby the two distinct experimental approaches -- counts of beta decays in aneutron beam and storage of ultracold neutrons in a potential trap, namely, thebeam method versus the bottle method. In this paper, we propose a newexperiment to measure the neutron lifetime in a cold neutron beam with asensitivity goal of 0.1% or sub-1 second. The neutron beta decays will becounted in a superfluid helium-4 scintillation detector at 0.5 K, and theneutron flux will be simultaneously monitored by the helium-3 captures in thesame volume. The cold neutron beam must be of wavelength $\lambda>16.5$ A toeliminate scattering with superfluid helium. A new precise measurement ofneutron lifetime with the beam method of unique inherent systematic effectswill greatly advance in resolving the puzzle.

A New Neutron Lifetime Experiment with Cold Neutron Beam Decay in Superfluid Helium-4