caa a22 4500 445368969 CHVBK 20180317142940.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s00340-010-4261-x doi (NATIONALLICENCE)springer-10.1007/s00340-010-4261-x Introducing the fission-fusion reaction process: using alaser-accelerated Th beam to produce neutron-rich nuclei towards the N =126 waiting point of the r -process [Elektronische Daten] [D. Habs, P. Thirolf, M. Gross, K. Allinger, J. Bin, A. Henig, D. Kiefer, W. Ma, J. Schreiber] We propose to produce neutron-rich nuclei in the range of the astrophysical r-process (the rapid neutron-capture process) around the waiting point N=126 (Kratz et al. in Prog. Part. Nucl. Phys. 59:147, 2007; Arnould et al. in Phys. Rep. 450:97, 2007; Panov and Janka in Astron. Astrophys. 494:829, 2009) by fissioning a dense laser-accelerated thorium ion bunch in a thorium target (covered by a polyethylene layer, CH2), where the light fission fragments of the beam fuse with the light fission fragments of the target. Using the ‘hole-boring' (HB) mode of laser radiation pressure acceleration (RPA) (Robinson et al. in Plasma Phys. Control. Fusion 51:024004, 2009; Henig et al. in Phys. Rev. Lett. 103:245003, 2009; Tajima et al. in Rev. Accel. Sci. Technol. 2:221, 2009) using a high-intensity, short pulse laser, bunches of 232Th with solid-state density can be generated very efficiently from a Th layer (ca. 560nm thick), placed beneath a deuterated polyethylene foil (CD2 with ca. 520nm), both forming the production target. Th ions laser-accelerated to about 7MeV/u will pass through a thin CH2 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 CD2 production target will be accelerated as well to about 7 MeV/u, also inducing the fission process of 232Th in the second Th layer. The laser-accelerated ion bunches with solid-state density, which are about 1014 times more dense than classically accelerated ion bunches, allow for a high probability that generated fission products can fuse again when the fragments from the thorium beam strike the Th layer of the reaction target. In contrast to classical radioactive beam facilities, where intense but low-density radioactive beams of one ion species are merged with stable targets, the novel fission-fusion process draws on the fusion between neutron-rich, short-lived, light fission fragments from both beam and target. Moreover, the high ion beam density may lead to a strong collective modification of the stopping power in the target by ‘snowplough-like' removal of target electrons, leading to significant range enhancement, thus allowing us to use rather thick targets. Using a high-intensity laser with two beams with a total energy of 300J, 32fs pulse length and 3μm focal diameter, as, e.g. envisaged for the ELI-Nuclear Physics project in Bucharest (ELI-NP)(http://www.eli-np.ro, 2010), order-of-magnitude estimates promise a fusion yield of about 103 ions per laser pulse in the mass range of A=180-190, thus enabling us to approach the r-process waiting point at N=126. First studies on ion acceleration, collective modifications of the stopping behaviour and the production of neutron-rich nuclei can also be performed at the upcoming new laser facility CALA (Center for Advanced Laser Applications) inGarching. Springer-Verlag, 2010 Habs D. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut Thirolf P. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut Gross M. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut Allinger K. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut Bin J. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut Henig A. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut Kiefer D. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut Ma W. Max-Planck-Institut für Quantenoptik, 85748, Garching, Germany aut Schreiber J. Max-Planck-Institut für Quantenoptik, 85748, Garching, Germany aut Applied Physics B Springer-Verlag 103/2(2011-05-01), 471-484 0946-2171 103:2<471 2011 103 340 https://doi.org/10.1007/s00340-010-4261-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-010-4261-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Habs D. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut NATIONALLICENCE 700 1- Thirolf P. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut NATIONALLICENCE 700 1- Gross M. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut NATIONALLICENCE 700 1- Allinger K. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut NATIONALLICENCE 700 1- Bin J. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut NATIONALLICENCE 700 1- Henig A. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut NATIONALLICENCE 700 1- Kiefer D. Fakultät für Physik, Ludwig-Maximilians Universität München, 85748, Garching, Germany aut NATIONALLICENCE 700 1- Ma W. Max-Planck-Institut für Quantenoptik, 85748, Garching, Germany aut NATIONALLICENCE 700 1- Schreiber J. Max-Planck-Institut für Quantenoptik, 85748, Garching, Germany aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 103/2(2011-05-01), 471-484 0946-2171 103:2<471 2011 103 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer