Signature inversion caused by triaxiality and unpaired band crossings in 72Br
High-spin states in 72Br were studied with the EUROBALL III spectrometer using the 40Ca(40Ca,alpha3p1n) reaction. The negative-parity band observed in this experiment displays a signature inversion around spin I = 16. The interpretation within the cranked Nilsson-Strutinsky approach shows that this signature pattern is a signal of a substantial triaxial shape change with increasing spin where the nucleus evolves from a triaxial shape with rotation about the intermediate axis at low spin through a collective prolate shape to a triaxial shape but with rotation about the shortest principal axis at high spin.
Plettner
C
Institut fur Kern- und Hadronenphysik, FZ Rossendorf, D-01314 Dresden, Germany and Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, P.O. Box MG-6, Romania.
Ragnarsson
I
Schnare
H
Schwengner
R
Kaubler
L
Donau
F
Algora
A
de Angelis G
Napoli
DR
Gadea
A
Eberth
J
Steinhardt
T
Thelen
O
Hausmann
M
Muller
A
Jungclaus
A
Lieb
KP
Jenkins
DG
Wadsworth
R
Wilson
AN