Welcome to the nuclear structure and reactions group

Atomic nuclei are the carrier of almost all visible mass in the universe. Nuclei also provide the fuel powering stars and nuclear reactions produce all naturally occurring chemical elements. Despite this fundamental role of nuclei in the universe, their structure and dynamics cannot yet be satisfactorily described on the basis of the fundamental strong interaction. One of the major successes in the description of the properties of atomic nuclei was the introduction of the nuclear shell model. For certain numbers of protons or neutrons, the so-called magic numbers, discontinuities occur, for example in the nucleon separation energies. In analogy to the successful atomic shell model, these magic numbers were interpreted as closed shell configurations, similar to the noble gases. In exotic nuclei however, far away from the stable isotopes, several experimental as well as theoretical investigations found evidence that the shell structure of atomic nuclei can change locally. In order to understand the underlying causes for the migration of nuclear shells, sensitive experimental methods are of paramount importance to investigate rare isotopes far from stability.

We use direct reactions to populate states in the exotic nuclei and state-of-the-art experimental equipment. Our experiments are performed at world leading radioactive beam facilities such as the RIBF (JAPAN), NSCL (USA) and TRIUMF (Canada). There is plenty of opportunity for graduate and undergraduate students to go and participate in experiments around the world.
For more information on specific topics visit the research webpage.


Kathrin Wimmer
Department of Physics, Lecturer
The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, TOKYO 113-0033 Japan
tel: +81-3-5841-4216
e-mail: wimmer__@__phys.s.u-tokyo.ac.jp (remove "_")


Paper on two-neutron transfer reactions with a tritium target published
Paper on the spectroscopy of 28Na published
The e14019 experiment at NSCL was successfully completed

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