Phys. Rev. Lett. 92, 112502 (2004) [4 pages]Evidence for Multiphonon Giant Resonances in Electromagnetic Fission of 238UReceived 7 October 2003; published 18 March 2004 Differential cross sections for electromagnetic fission of 238U projectiles (500 MeV/u) in C, Sn, and Pb targets are measured and analyzed in terms of single- and multiphonon giant resonance excitations as doorway states to fission. A novel experimental method exploits the linear relationship between neutron multiplicity and the primary 238U excitation energy. Multiphonon states contribute up to 20% of the cross section; a component at high excitation energies is indicated that may arise from three-phonon dipole and two-phonon GDR⊗GQRiv giant resonance excitations. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.112502
DOI:
10.1103/PhysRevLett.92.112502
PACS:
25.85.–w, 24.30.Cz, 25.70.De
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