New shape isomer in the self-conjugate nucleus 72Kr
Bouchez, E., Matea, I., Korten, W., Becker, F., Blank, B., Borcea, C., . . . Theisen, C. (2003). New shape isomer in the self-conjugate nucleus 72Kr. Physical Review Letters, 90 (8), 082502. doi:10.1103/PhysRevLett.90.082502
Published inPhysical Review Letters
Buta, A. |
©2003 American Physical Society
A new isomeric 0+ state was identified as the first excited state in the self-conjugate (N = Z) nucleus 72Kr. By combining for the first time conversion-electron and gamma-ray spectroscopy with the production of metastable states in high-energy fragmentation, the electric-monopole decay of the new isomer to the ground state was established. The new 0+ state is understood as the band head of the known prolate rotational structure, which strongly supports the interpretation that 72Kr is one of the rare nuclei having an oblate-deformed ground state. This observation gives in fact the first evidence for a shape isomer in a N = Z nucleus.