Neutron and protonh _11/2 alignment effects in¹²¹La

In a γ-spectroscopic study, excited states in the very neutron deficient nucleus¹²¹La have been established for the first time. Rotational bands built on the 9/2⁺[404] and l/2⁻[550] Nilsson orbitals are observed up to a maximum spin of tentatively 51/2ħ. The experimental results are compared with Total Routhian Surface calculations.

Authors and Affiliations

1. Manne Siegbahn Institute of Physics, S-10405, Stockholm, Sweden

   B. Cederwall & A. Johnson

2. Physics Department I, The Royal Institute of Technology, S-10044, Stockholm, Sweden

   B. Cederwall & A. Johnson

3. Department of Physics, University of Helsinki, SF-00170, Helsinki, Finland

   B. Fant

4. Department of Physics, University of Jyväskylä, SF-40100, Jyväskylä, Finland

   S. Juutinen & P. Ahonen

5. Department of Physics, Kyushu University, 812, 33, Fukuoka, Japan

   S. Mitarai & J. Mukai

6. Tandem Accelerator Laboratory, Niels Bohr Institute, DK-4000, Roskilde, Denmark

   J. Nyberg

We are grateful to the staff of the Tandem Accelerator Laboratory, Risø, and to the other members of the NORDBALL collaboration. R. Wyss is acknowledged for support with the TRS calculations.

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