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We propose to produce neutron-rich nuclei in the range of the astrophysicalr-process around the waiting point N=126 by fissioning a denselaser-accelerated thorium ion bunch in a thorium target (covered by a CH2layer), where the light fission fragments of the beam fuse with the lightfission fragments of the target. Via the 'hole-boring' mode of laser RadiationPressure Acceleration using a high-intensity, short pulse laser, veryefficiently bunches of 232Th with solid-state density can be generated from aTh layer, placed beneath a deuterated polyethylene foil, both forming theproduction target. Th ions laser-accelerated to about 7 MeV/u will pass througha thin CH2 layer placed in front of a thicker second Th foil closely behind theproduction target and disintegrate into light and heavy fission fragments. Inaddition, light ions (d,C) from the CD2 production target will be acceleratedas well to about 7 MeV/u, inducing the fission process of 232Th also in thesecond Th layer. The laser-accelerated ion bunches with solid-state density,which are about 10^14 times more dense than classically accelerated ionbunches, allow for a high probability that generated fission products can fuseagain. In contrast to classical radioactive beam facilities, where intense butlow-density radioactive beams are merged with stable targets, the novelfission-fusion process draws on the fusion between neutron-rich, short-lived,light fission fragments both from beam and target. The high ion beam densitymay lead to a strong collective modification of the stopping power in thetarget, leading to significant range enhancement. Using a high-intensity laseras envisaged for the ELI-Nuclear Physics project in Bucharest (ELI-NP),estimates promise a fusion yield of about 10^3 ions per laser pulse in the massrange of A=180-190, thus enabling to approach the r-process waiting point atN=126.

applied physics. b, lasers and optics

Introducing the Fission-Fusion Reaction Process: Using a  Laser-Accelerated Th Beam to produce Neutron-Rich Nuclei towards the N=126  Waiting Point of the r Process