Article,
Dipole and electric quadrupole excitations in Ca-40,Ca-48
Phys. Rev. C, (March 2002)
DOI: 10.1103/PhysRevC.65.034301
Abstract
Photon scattering experiments have been performed to investigate the
structure of the two doubly magic nuclei Ca-40,Ca-48. The method is
highly selective to induce low-order multipole transitions, i.e., E1,
M1, and E2 from the ground state. We determined the energies and spins
of excited states and the absolute strengths of the gamma decays in a
model independent way. We find the summed electric dipole strengths
below 10 MeV to exhaust the energy weighted sum rule by 0.023 and
0.27\%, respectively. The summed electric quadrupole strengths are
SigmaB(E2)up arrow = 332 e(2) fm(4) and 407 e(2) fm(4) for Ca-40 and
Ca-48, respectively. In order to explain the difference in the E1
strengths of the two isotopes several theoretical models are discussed.
