<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><mo>(</mo><mi>e</mi><mo>,</mo><mi> </mi><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mo>)</mo></math></span> Reaction Leading to Low-Lying States in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">B</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>12</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

K. Shoda; H. Ohashi; K. Nakahara

doi:10.1103/PhysRevLett.39.1131

${}^{12}C (e, e^{'} π^{+})$ Reaction Leading to Low-Lying States in ${}^{12}B$

K. Shoda, H. Ohashi, and K. Nakahara

Phys. Rev. Lett. 39, 1131 – Published 31 October 1977; Erratum Phys. Rev. Lett. 40, 1055 (1978)

Abstract

Energy and angular distributions of photopions from ${}^{12}C$ , leading to low-lying residual states in ${}^{12}B$ , have been measured via the ( $e, e^{'} π^{+}$ ) reaction at $E_{e} = 195$ MeV. The shape of the patterns agrees with the theoretical estimates deduced from other electron scattering data and also with shell-model calculations. A comparison of the absolute value shows the importance of correct estimation of the pion wave. The result demonstrates that photopion experiments can provide a promising method for studying spin-flip-type electromagnetic transitions in nuclei.