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VOLUME 52 (1990) | ISSUE 7 | PAGE 984
Measurement of neutron lifetime with a gravitational trap for ultracold neutrons
The lifetime of the neutron has been measured through confinement of ultracold neutrons in a gravitational trap. The result is r„ = 888.4 + 2.9 s. This lifetime corresponds to a ratio GA /Gv = λ of — (1.2677 + 0.0025). The discrepancy in the results on the parameter Я found from measurements of the neutron lifetime and from measurements of the electron-spin asymmetry of the/? decay of the neutron is discussed.