<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mi>γ</mi><mo>,</mo><mi>n</mi><mo>)</mo></math></span> study of the isovector quadrupole resonance in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>40</mn></mrow></msup></mrow></math></span>Ca

D. A. Sims; G. J. O’Keefe; R. P. Rassool; A. Kuzin; M. N. Thompson; J-O. Adler; B-E. Andersson; K. G. Fissum; K. Hansen; L. Isaksson; B. Nilsson; H. Ruijter; A. Sandell; B. Schröder; J. R. M. Annand; G. I. Crawford; P. D. Harty; J. C. McGeorge; G. J. Miller

doi:10.1103/PhysRevC.55.1288

$(γ, n)$ study of the isovector quadrupole resonance in $^{40}$ Ca

D. A. Sims, G. J. O’Keefe, R. P. Rassool, A. Kuzin, M. N. Thompson, J-O. Adler, B-E. Andersson, K. G. Fissum, K. Hansen, L. Isaksson, B. Nilsson, H. Ruijter, A. Sandell, B. Schröder, J. R. M. Annand, G. I. Crawford, P. D. Harty, J. C. McGeorge, and G. J. Miller

Phys. Rev. C 55, 1288 – Published 1 March 1997

Abstract

The forward-to-backward asymmetry of neutrons emitted in the $^{40}$ Ca $(γ {, n}_{0})$ reaction was measured at photon energies in the range of 27–50 MeV. An energy-dependent asymmetry was observed that is interpreted as evidence of interference between the isovector quadrupole resonance and the giant dipole resonance. Data analysis in terms of semiclassical and direct-semidirect models estimate the isovector quadrupole resonance to be at an excitation energy of $31.0 \pm 1.5$ MeV, with a width of $16.0 \pm 1.5$ MeV, and exhausting most of the energy-weighted sum rule for the isovector quadrupole resonance.