ELSWIER Nuclear Physics A734 (2004) 257-260 www.elsevier.comllocatelnpe New Insights Into Neutron Rich Nuclei From Fission J.H. Hamilton”, S.J. Zhuabc, A.V. Ramayya”, P.M. Gorea, J.O. Rasmussend, E.F. Jones”, J.K. Hwang”, R.Q. Xub, L.Y. Yangb, K. Liab, Z. Jiangb, Z. Zhangb, SD. Ziaob, X.Q. Zhang”, J. Kormicki”, Y.X. Luoad, L. Chaturvedi”“, W.C. Maf, J.D. Coles, M.W. Drigertg, I.Y. Leed, P. Fallond, M.A. Stoyerh, T.N. Ginter’, G.M. Ter-Akopianj, A.V. Danielj, Yu.Ts. Oganessianj, R. Donangelo k, V. Dimitrov’, S. Frauendorf’ “Vanderbilt University, Nashville, TN 37235 bTsinghua University, Beijing, China ‘Joint Institute for Heavy Ion Research, Oak Ridge, TN 37835 dLawrence Berkeley National Laboratory, Berkeley, CA 94720 eBanaras Hindu University, Varanasi 221 005, India fMississippi State University, MS 39762 gIdaho National Laboratory, Idaho Falls, ID 83415 hLawrence Livermore National Laboratory, Livermore, CA 94551 ‘Michigan State University, East Lansing, MI 48824-1321 jJoint Institute for Nuclear Research, RU-141980 Dubna, Russia kUniversidade Rio de Janeiro, Rio de Janeiro, Brazil ‘University of Notre Dame, Notre Dame, IN 46556 Neutron-rich nuclei populated in spontaneous fission are providing new tests for mi- croscopic models. The neutron-rich 104-108M~, lo8-‘14Ru and 112-11sPd exibit a variety of rapidly changing collective band structures to high spins. The first evidence for chiral band doublets in any even-even nucleus are reported. Neutron-rich nuclei lie in a relatively unexplored region of nuclear matter where different combinations of the proton and neutron orbitals can lead to new nuclear structure features. Here a few unexpected nuclear structure features illustrate the new physics challenges that are to be found in neutron-rich nuclei including: a) remarkably different staggering patterns of the y-vibrational bands in 104,106Mo, ~‘%~~~,~~~R,, and ~12,1~4,1’6pd, b) new doublet bands in “‘MO that provide the first evidence for chiral bands in an even-even nucleus and now with different structures than found in o-o nuclei, c) evidence 0375-9474/s - see front matter 0 2004 Elsevier B.V. All rights reserved. doi:10.1016/j.nuclphysa.2004.01.048