EPJ

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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 10, 245-248

Signature inversion in ${\pi i_{13/2} \otimes \nu i_{13/2}}$ structure in 178Ir

D. Hojman1, 2, 3, M.A. Cardona1, 3, D.R. Napoli4, S.M. Lenzi5, C.A. Ur5, G. Lo Bianco6, C.M. Petrache6, M. Axiotis4, D. Bazzacco5, J. Davidson2, 7, M. Davidson2, 7, M. De Poli4, G. de Angelis4, E. Farnea4, T. Kroell5, S. Lunardi5, N. Marginean4, T. Martínez4, R. Menegazzo5, B. Quintana5 and C. Rossi Alvarez5

1  Departamento de Física, CNEA, Buenos Aires, Argentina
2  CONICET, Argentina
3  Universidad Nacional de General San Martín, Argentina
4  INFN, Laboratori Nazionali di Legnaro, Italy
5  Dipartimento di Física and INFN, Padova, Italy
6  Dipartimento di Matematica e Fisica, Università di Camerino, Italy
7  Departamento de Física, Universidad de Buenos Aires, Argentina

(Received: 13 December 2000 / Revised version: 13 March 2001 Communicated by D. Schwalm)

Abstract
High-spin states in 178Ir were investigated by means of in-beam $\gamma$-ray spectroscopy techniques using the multidetector array GASP. Excited states of 178Ir were populated through the 159Tb(24Mg, 5n) fusion-evaporation reaction at $E(^{24}{\rm Mg}) = 131{--}141$ MeV. Several rotational bands were observed. Among them, the ${\pi i_{13/2} \otimes \nu i_{13/2}}$ structure has been identified up to spin 36 $\hbar$. This band exhibits an anomalous signature splitting and a signature inversion around spin 25 $\hbar$.

PACS
21.10.Re - Collective levels.
23.20.Lv - $\gamma$ transitons and level energies.
27.70.+q - $150\leq A \leq 189$ .

© Società Italiana di Fisica, Springer-Verlag 2001

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