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Title: Fission-Fusion: A new reaction mechanism for nuclear astrophysics based on laser-ion acceleration

Abstract

We propose to produce neutron-rich nuclei in the range of the astrophysical r-process around the waiting point N = 126 by fissioning a dense laser-accelerated thorium ion bunch in a thorium target (covered by a CH{sub 2} layer), where the light fission fragments of the beam fuse with the light fission fragments of the target. Via the 'hole-boring' mode of laser Radiation Pressure Acceleration using a high-intensity, short pulse laser, very efficiently bunches of {sup 232}Th with solid-state density can be generated from a Th target and a deuterated CD{sub 2} foil, both forming the production target assembly. Laser-accelerated Th ions with about 7 MeV/u will pass through a thin CH{sub 2} layer placed in front of a thicker second Th foil (both forming the reaction target) closely behind the production target and disintegrate into light and heavy fission fragments. In addition, light ions (d,C) from the CD{sub 2} layer of the production target will be accelerated as well, inducing the fission process of {sup 232}Th also in the second Th layer. The laser-accelerated ion bunches with solid-state density, which are about 10{sup 14} times more dense than classically accelerated ion bunches, allow for a high probability that generated fissionmore » products can fuse again. The high ion beam density may lead to a strong collective modification of the stopping power, leading to significant range and thus yield enhancement. Using a high-intensity laser as envisaged for the ELI-Nuclear Physics project in Bucharest (ELI-NP), order-of-magnitude estimates promise a fusion yield of about 10{sup 3} ions per laser pulse in the mass range of A = 180-190, thus enabling to approach the r-process waiting point at N = 126.« less

Authors:
; ; ; ; ;  [1];  [1];  [2]; ;  [3]
  1. Fakultaet fuer Physik, Ludwig-Maximilians Universitaet Muenchen, D-85748 Garching (Germany)
  2. (Germany)
  3. Max-Planck-Institut fuer Quantenoptik, D-85748 Garching (Germany)
Publication Date:
OSTI Identifier:
21612124
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1377; Journal Issue: 1; Conference: FINUSTAR 3 Conference on frontiers in nuclear structure, astrophysics, and reactions, Rhodes (Greece), 23-27 Aug 2010; Other Information: DOI: 10.1063/1.3628362; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCELERATION; ASTROPHYSICS; BEAM BUNCHING; DEUTERIDES; DEUTERONS; FISSION; FISSION FRAGMENTS; FISSION PRODUCTS; FUSION YIELD; LASER RADIATION; LAYERS; MEV RANGE; MODIFICATIONS; NEUTRON-RICH ISOTOPES; POLARIZATION; R PROCESS; STOPPING POWER; THORIUM 232; THORIUM 232 REACTIONS; THORIUM 232 TARGET; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; BEAM DYNAMICS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CHARGED PARTICLES; DEUTERIUM COMPOUNDS; DYNAMICS; ELECTROMAGNETIC RADIATION; ENERGY RANGE; EVEN-EVEN NUCLEI; EVOLUTION; HEAVY ION REACTIONS; HEAVY NUCLEI; HYDROGEN COMPOUNDS; ISOTOPES; MATERIALS; MECHANICS; NUCLEAR FRAGMENTS; NUCLEAR REACTION YIELD; NUCLEAR REACTIONS; NUCLEI; PHYSICS; RADIATIONS; RADIOACTIVE MATERIALS; RADIOISOTOPES; SPONTANEOUS FISSION RADIOISOTOPES; STAR EVOLUTION; TARGETS; THORIUM ISOTOPES; YEARS LIVING RADIOISOTOPES; YIELDS

Citation Formats

Thirolf, P. G., Gross, M., Allinger, K., Bin, J., Henig, A., Kiefer, D., Habs, D., Max-Planck-Institut fuer Quantenoptik, D-85748 Garching, Ma, W., and Schreiber, J. Fission-Fusion: A new reaction mechanism for nuclear astrophysics based on laser-ion acceleration. United States: N. p., 2011. Web. doi:10.1063/1.3628362.
Thirolf, P. G., Gross, M., Allinger, K., Bin, J., Henig, A., Kiefer, D., Habs, D., Max-Planck-Institut fuer Quantenoptik, D-85748 Garching, Ma, W., & Schreiber, J. Fission-Fusion: A new reaction mechanism for nuclear astrophysics based on laser-ion acceleration. United States. doi:10.1063/1.3628362.
Thirolf, P. G., Gross, M., Allinger, K., Bin, J., Henig, A., Kiefer, D., Habs, D., Max-Planck-Institut fuer Quantenoptik, D-85748 Garching, Ma, W., and Schreiber, J. Fri . "Fission-Fusion: A new reaction mechanism for nuclear astrophysics based on laser-ion acceleration". United States. doi:10.1063/1.3628362.
@article{osti_21612124,
title = {Fission-Fusion: A new reaction mechanism for nuclear astrophysics based on laser-ion acceleration},
author = {Thirolf, P. G. and Gross, M. and Allinger, K. and Bin, J. and Henig, A. and Kiefer, D. and Habs, D. and Max-Planck-Institut fuer Quantenoptik, D-85748 Garching and Ma, W. and Schreiber, J.},
abstractNote = {We propose to produce neutron-rich nuclei in the range of the astrophysical r-process around the waiting point N = 126 by fissioning a dense laser-accelerated thorium ion bunch in a thorium target (covered by a CH{sub 2} layer), where the light fission fragments of the beam fuse with the light fission fragments of the target. Via the 'hole-boring' mode of laser Radiation Pressure Acceleration using a high-intensity, short pulse laser, very efficiently bunches of {sup 232}Th with solid-state density can be generated from a Th target and a deuterated CD{sub 2} foil, both forming the production target assembly. Laser-accelerated Th ions with about 7 MeV/u will pass through a thin CH{sub 2} layer placed in front of a thicker second Th foil (both forming the reaction target) closely behind the production target and disintegrate into light and heavy fission fragments. In addition, light ions (d,C) from the CD{sub 2} layer of the production target will be accelerated as well, inducing the fission process of {sup 232}Th also in the second Th layer. The laser-accelerated ion bunches with solid-state density, which are about 10{sup 14} times more dense than classically accelerated ion bunches, allow for a high probability that generated fission products can fuse again. The high ion beam density may lead to a strong collective modification of the stopping power, leading to significant range and thus yield enhancement. Using a high-intensity laser as envisaged for the ELI-Nuclear Physics project in Bucharest (ELI-NP), order-of-magnitude estimates promise a fusion yield of about 10{sup 3} ions per laser pulse in the mass range of A = 180-190, thus enabling to approach the r-process waiting point at N = 126.},
doi = {10.1063/1.3628362},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1377,
place = {United States},
year = {Fri Oct 28 00:00:00 EDT 2011},
month = {Fri Oct 28 00:00:00 EDT 2011}
}