Is There an Isoscalar "Giant" Quadrupole Resonance in <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>?

H. Riedesel; K. T. Knöpfle; H. Breuer; P. Doll; G. Mairle; G. J. Wagner

doi:10.1103/PhysRevLett.41.377

Is There an Isoscalar "Giant" Quadrupole Resonance in ${}^{12}C$ ?

H. Riedesel, K. T. Knöpfle, H. Breuer, P. Doll, G. Mairle, and G. J. Wagner

Phys. Rev. Lett. 41, 377 – Published 7 August 1978

Abstract

Apparent discrepancies in the amount of $E 2$ strength located in the giant resonance region of ${}^{12}C$ are resolved by a ${}^{12}C (α, α^{'} c)$ coincidence experiment at 104 MeV. The summed $E 2$ strengths in the dominant decay channels $c = α_{0}, α_{1}$ , and $p_{0}$ in the range $20 <~ E_{x} <~ 30$ MeV exhaust less than 15% of the energy-weighted sum rule. So far ${}^{12}C$ is the only investigated nucleus which does not exhibti a giant quadrupole resonance.

Received 22 May 1978

DOI:https://doi.org/10.1103/PhysRevLett.41.377

Authors & Affiliations

H. Riedesel, K. T. Knöpfle, H. Breuer^*, P. Doll^†, and G. Mairle

Max-Planck-Institut für Kernphysik, D-69 Heidelberg, West Germany

G. J. Wagner^‡

Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742, and Max-Planck-Institut für Kernphysik, D-69 Heidelberg, West Germany

^*Present address: Department of Chemistry, University of Maryland, College Park, Md. 20742.
^†Present address: Building 88, Lawrence Berkeley Laboratory, Berkeley, Calif. 94720.
^‡Permanent address.