Improved Experimental Test of Detailed Balance and Time Reversibility in the Reactions ${}^{27}{Al} + p ⇆ {}^{24}{Mg} + α$

Publisher Website

1 August 1983

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 51 (5) , 355-358
https://doi.org/10.1103/physrevlett.51.355

Abstract

A new test of the principle of detailed balance in the nuclear reactions

{}^{27}{Al} (p, α_{0}) {}^{24}{Mg}

and

{}^{24}{Mg} (α, p_{0}) {}^{27}{Al}

at bombarding energies

7.3 MeV <~ E_{p} <~ 7.7 MeV

and

10.1 MeV <~ E_{α} <~ 10.5 MeV

, respectively, is reported. Measured relative differential cross sections agree within the experimental uncertainty

Δ = \pm 0.51 %

and hence are consistent with time-reversal invariance. From this result an upper limit

ξ <~ 5 \times 10^{- 4}

(80% confidence) is derived for a possible time-reversal-noninvariant amplitude in the reaction.

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