Transient effects in fission evidenced from new experimental signatures

Abstract

A new experimental approach is introduced to investigate the relaxation of the nuclear deformation degrees of freedom. Highly excited fissioning systems with compact shapes and low angular momenta are produced in peripheral relativistic heavy-ion collisions. Both fission fragments are identified in atomic number. Fission cross sections and fission-fragment element distributions are determined as a function of the fissioning element. From the comparison of these new observables with a nuclear-reaction code a value for the transient time is deduced.

6 pages, 2 figures, background information at http://www-w2k.gsi.de/kschmidt/

References in corpus (7)

• Evaporation of light particles from a hot, deformed and rotating nucleus
• Time evolution of the fission-decay width under the influence of dissipation
• Production of Neutron-rich Heavy Residues and the Freeze-out Temperature in the Fragmentation of Relativistic 238U Projectiles Determined by the Isospin Thermometer
• Mean first passage time for nuclear fission and the emission of light particles
• Variation of transport coefficients for average fission dynamics with temperature and shape
• Evaporation residue cross-sections as a probe for nuclear dissipation in the fission channel of a hot rotating nucleus
• A note on the time evolution of the fission decay width under the influence of dissipation

Cited by in corpus (10)

• First experiment on fission transients in highly fissile spherical nuclei produced by fragmentation of radioactive beams
• Fragmentation of spherical radioactive heavy nuclei as a novel probe of transient effects in fission
• Production of medium-mass neutron-rich nuclei in reactions induced by 136Xe projectiles at 1 A GeV on a beryllium target
• Transient and quasi-stationary dissipative effects in the fission flux across the barrier in 1 A GeV 238U on deuterium reactions
• First direct measurement of isotopic fission-fragment yields of ${}^{239}$U
• Manifestation of transient effects in fission induced by relativistic heavy-ion collisions
• Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics
• Simple description of the temperature dependencies of the width of fission-fragment mass yield in 197Au and 209Bi at intermediate energies
• Comprehensive investigation of fission yields by using spallation- and (p,2p)-induced fission reactions in inverse kinematics
• Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach: 210Po, 212Rn, and 213Fr