Insight into excitation energy and structure effects in fission from isotopic information in fission yields

D. Ramos , M. Caamano , F. Farget (1) , C. Rodriguez-Tajes (1) , L. Audouin (2) , J. Benlliure , E. Casarejos , E. Clement (1) , D. Cortina , O. Delaune (1) , X. Derkx (3) , A. Dijon (1) , D. Doré (4) , B. Fernandez-Dominguez , G. de France (1) , A. Heinz , B. Jacquot (1) , C. Paradela , M. Rejmund (1) , T. Roger (1) , M.-D. Salsac (4) , C. Schmitt (1)

1 GANIL - Grand Accélérateur National d'Ions Lourds
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 LPCC - Laboratoire de physique corpusculaire de Caen
4 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

The use of the inverse kinematics technique and a magnetic spectrometer permits the simultaneous measurement of proton and neutron content of full fission fragment distributions. This paper reports new measurements of five fissioning systems—U238,Np239,Pu240,Cm244, and Cf250—produced in inelastic scattering, transfer, and fusion reactions at different excitation energies. As a result, isotopic, elemental, and isotonic fission yields are presented. The contribution of the different fission modes and the proton even-odd effect are studied. Structure effects are investigated by means of the neutron excess and the total neutron multiplicity as a function of the fragment atomic number.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

D. Ramos, M. Caamano, F. Farget, C. Rodriguez-Tajes, L. Audouin, et al.. Insight into excitation energy and structure effects in fission from isotopic information in fission yields. Physical Review C, 2019, 99 (2), pp.024615. ⟨10.1103/PhysRevC.99.024615⟩. ⟨in2p3-02022548⟩