Experimental Test of Time-Reversal Invariance in the Reaction <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>n</mi><mo>+</mo><mi>p</mi><mo>→</mo><mi>γ</mi><mo>+</mo><mi>d</mi></math></span>

Bryce L. Schrock; Roy P. Haddock; Jerome A. Helland; Michael J. Longo; Stephen S. Wilson; Kenneth K. Young; David Cheng; Victor Perez-Mendez

doi:10.1103/PhysRevLett.26.1659

Experimental Test of Time-Reversal Invariance in the Reaction $n + p \to γ + d$

Bryce L. Schrock, Roy P. Haddock, and Jerome A. Helland^*

Michael J. Longo, Stephen S. Wilson^†, and Kenneth K. Young^‡

David Cheng^§ and Victor Perez-Mendez

University of California, Los Angeles, California 90024

University of Michigan, Ann Arbor, Michigan 48104

Lawrence Radiation Laboratory, Berkeley, California 94720

^*Now at Department of Physics, University of California, Berkeley, Calif. 94720.
^†Now at Bendix Systems Division, Ann Arbor, Mich.
^‡Now at Department of Physics, University of Washington, Seattle, Wash. 98105.
^§Now at Bell Telephone Laboratories, Whippany, N. J. 07981.

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Phys. Rev. Lett. 26, 1659 – Published 28 June, 1971

DOI: https://doi.org/10.1103/PhysRevLett.26.1659

Abstract

A measurement of the angular distribution for the reaction $n + p \to γ + d$ has been made at the Lawrence Radiation Laboratory 184-in. cyclotron for neutron kinetic energies in range 300 to 720 MeV. A total of 30 000 $n + p \to γ + d$ events were collected in twenty energy-angle bins. A comparison with the angular distribution for the inverse process indicates that the data are consistent with time-reversal invariance in this reaction. If the results are interpreted in the framework of a model by Barshay, the measured $T$ -invariance violating phase angle is $ϕ = {(4 \pm 10)}^{\circ}$ , where $ϕ = 90^{\circ}$ for a maximal $T$ -invariance violation.

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Experimental Test of Time-Reversal Invariance in the Reaction $n + p \to γ + d$

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Experimental Test of Time-Reversal Invariance in the Reaction n+p→γ+d

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Experimental Test of Time-Reversal Invariance in the Reaction $n + p \to γ + d$