Neutron decay of the isoscalar giant resonance region inZr90

Abstract
The neutron decay of the giant resonance region between 13.0 and 18.0 MeV in Zr90 has been studied in an (α,α’n) coincidence experiment at Eα=104 MeV. In the region of the giant quadrupole resonance between 13 and 16 MeV, additional strength with multipolarity L≥4 was identified. For the resonant strength in the region of the giant monopole resonance, a direct decay component of about 12% can be estimated. In addition, evidence for a preequilibrium decay was found.