Program - Brookhaven National Laboratory

H. Penttilä, D. Gorelov, T. Eronen, V-V. Elomaa, U. Hager, J. Hakala, A. Jokinen, A. Kankainen, P.
Karvonen, I.D. Moore, J. Parkkonen, K. Peräjärvi, S. Rahaman, S. Rinta-Antila, V. Rubchenya, T.
Sonoda, J. Aystö
Department of Physics, P.O.Box 35 YFL, FI-40014 University of Jyväskylä, Finland
M. Lantz, A. Mattera, S. Pomp, A. Solders
Uppsala University, Box 516, S-75120 Uppsala, Sweden
I. Ryzhov
V.G. Khlopin Radium Institute, St.-Petersburg 194021, Russia
Reliable data of independent fission product yields at intermediate energy are important for the technical
application of nuclear energy production and transmutation of nuclear waste in hybrid reactors [1] and
for developing the advanced GEN-IV nuclear reactors [2]. Though data for neutron-induced fission are
required in the first place, charged-particle induced fission data are valuable as well. Experimental data on
fission yields in these energies are sparse, and calculated data are used for the applications. The chargedparticle
induced fission yield data are often important in the adjustment of the model parameters, see e.g.
[3]. Recently, a new method to determine the isotopic fission yields in charged-particle induced fission
has been developed at the IGISOL facility in the accelerator laboratory of the University of Jyväskylä
[4]. The method is combining the capability of an ion guide based mass separator (IGISOL technique)
to produce an ion beam from every element and the unambiguous identification of the fission products
by their mass using a Penning trap (JYFLTRAP) as a high mass resolving power filter [5]. This far the
independent isotopic yields for most elements from Zn to La in 25 MeV proton-induced fission of 238 U and
232 Th, for Zn, Ga, Rb, Zr, Pd and Xe in 50 MeV proton-induced fission of 238 U and for Zn, Ga, Rb, Sr,
Cd and In in 25 MeV deuterium-induced fission of 238 U have been measured. There is also an on-going
program [6] to study directly the yields of neutron-induced fission in the future at the renewed IGISOL
facility [7] utilizing the high intensity proton beams from the new MCC30/15 light-ion cyclotron and a
proton-neutron converter target. The experimental results of the charged-particle induced fission yields
will be presented and compared with previous results and available experimental models. In particular,
the results are compared with the two-component exciton model of Rubchenya [8].
[1] C.D. Bowman et al., Nucl. Instr. and. Meth. A 320 (1992) 336 [2] J. Bouchard, in “Proceedings of
the International Conf. on Nuclear Data for Science and Technology,” April 22-27, 2007, Nice, France,
2008 CEA, DOI: 10.1051/ndata:07718. [3] A. C. Wahl in “Fission product yield data for the transmutation
of minor actinide nuclear waste,” Vienna, International Atomic Energy Agency, 2008 - http://wwwpub.iaea.org/MTCD/Publications/PDF/Pub1286
web.pdf [4] P. Karvonen et al., Nucl. Instr. and Meth.
B 266 (2008) 4454 [5] H. Penttilä et al., Eur. Phys. J. A 44 (2010) 147 [6] M. Lantz et al., in Physica
Scripta, Topical issue: 12th Nordic Conference on Nuclear Physics (in press) [7] H. Penttilä et al., J. Korean
Phys. Soc. 59 (2011) 1589 [8] V. Rubchenya, J. Äystö, Eur. Phys. J. A 48 (2012) 44
KD 4 2:40 PM
SPIDER: A New Instrument for Fission Fragment Yield Measurements
F. Tovesson, T. Bredeweg, C. Arnold, K. Meierbachtol, M. White
Los Alamos National Laboratory
A. Hecht, D. Mader, R. Blakeley
University of New Mexico
Properties of fission fragment are closely related to the process in which they are created. Measurements
of the mass, charge and kinetic energy of fragments following fission can help better understand this
complex process, and helps validate new theoretical models. Fission product yields are also of practical
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