Structure in the Giant Dipole Resonance of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">O</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>16</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>: Evidence for a Secondary Doorway State from Polarized-Proton Capture

J. R. Calarco; S. W. Wissink; M. Sasao; K. Wienhard; S. S. Hanna

doi:10.1103/PhysRevLett.39.925

Structure in the Giant Dipole Resonance of ${}^{16}O$ : Evidence for a Secondary Doorway State from Polarized-Proton Capture

J. R. Calarco, S. W. Wissink, M. Sasao, K. Wienhard, and S. S. Hanna

Phys. Rev. Lett. 39, 925 – Published 10 October 1977

Abstract

Sharp fluctuations in the coefficients describing the angular distribution and analyzing power in the reaction ${}^{15}N (p_{pol}, γ_{0}) {}^{16}O$ are observed near $E_{γ} = 21$ MeV. These correspond to structure in the total cross section. All these structures can be fitted by introducing a narrow secondary doorway state interfering with the primary giant dipole resonance of ${}^{16}O$ .