Radiative Pion Capture by <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">C</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>12</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

W.-C. Lam; K. Gotow; B. Macdonald; W. P. Trower; D. K. Anderson

doi:10.1103/PhysRevLett.28.108

Radiative Pion Capture by ${}^{12}C$

W.-C. Lam, K. Gotow, B. Macdonald, W. P. Trower, and D. K. Anderson

Phys. Rev. Lett. 28, 108 – Published 10 January 1972

Abstract

The neutron-photon angular-correlation and energy spectrum of neutrons from radiative pion capture by carbon are presented and provide new evidence for excitation of a $J^{π} = 1^{-}$ axial-vector collective mode. Asymmetry in the angular correlation increases with neutron energy and is accounted for by direct neutron emission.