Discovery of the neutron radiative decay

Details Discovery of the neutron radiative decay Discovery of the neutron radiative decay

2005-11-30

arxiv.org/abs/nucl-ex/0512001v3

JETP Lett. 83 (2006) 5-9

Physics

Nuclear Physics

Nuclear Experiment

Corrected version of this paper was published in JETP Letters 83(1)

Scientific paper

10.1134/S0021364006080145

The aim of this work is experimental discovery and research of a rare neutron mode, the radiative beta-decay, where a new particle, the radiative gamma-quantum, is formed along with the expected decay products beta-electron, recoil proton and antineutrino. The discovery of this rare neutron decay mode was conducted through identification of triple coincidences events: simultaneous registration of beta electron, proton and radiative gamma-quantum. The ordinary neutron decay was registered by double coincidences of beta electron and recoil proton. The ratio of triple to double coincidences is connected with relative intensity of radiative neutron decay (branching ratio - B.R.) B.R. = (3.2+1.6)10-3 (with 90 % C.L. and in the gamma energy region greater than 35 keV), which we are the first in the world to measure during the second and third cycles on FRMII (TUM, Germany) in Summer 2005. This value of B.R. is consistent with standard electroweak theory.

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