Anomalous Beta-Alpha Anisotropy in the Decay of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Na</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>20</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

Neil S. Oakey; Ronald D. Macfarlane

doi:10.1103/PhysRevLett.25.170

Anomalous Beta-Alpha Anisotropy in the Decay of ${}^{20}{Na}$

Neil S. Oakey and Ronald D. Macfarlane

Phys. Rev. Lett. 25, 170 – Published 20 July 1970

Abstract

An anisotropy has been observed in the $β - α$ directional correlation for an allowed $β^{+}$ decay in ${}^{20}{Na}$ . The effect is much larger than expected from interference from the second-order "weak magnetism" alone. The possibility of an enhanced $E 2$ interference is discussed.