Very high rotational frequencies and band termination in 73Br

Plettner, Christina; Schnare, Harald; Schwengner, Ronald; Kaeubler, Lutz; Doenau, Friedrich; Ragnarsson, Ingemar; Afanasjev, Anatoli; Algora, Alejandro; Deangelis, Giaccomo; Gadea, Andres; Napoli, Daniel; Eberth, Juergen; Steinhardt, Thorsten; Thelen, Olaf; Hausmann, Marius; Mueller, Alexander; Jungclaus, Andrea; Lieb, Klaus-Peter; Jenkins, David; Wadsworth, Robert; Wilson, Anna; Frauendorf, Stefan

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Very high rotational frequencies and band termination in 73Br

Plettner, C.; Schnare, H.; Schwengner, R.; Kaeubler, L.; Doenau, F.; Ragnarsson, I.; Afanasjev, A.; Algora, A.; Deangelis, G.; Gadea, A.; Napoli, D.; Eberth, J.; Steinhardt, T.; Thelen, O.; Hausmann, M.; Mueller, A.; Jungclaus, A.; Lieb, K.-P.; Jenkins, D.; Wadsworth, R.; Wilson, A.; Frauendorf, S.

Abstract

Rotational bands in 73Br have been investigated
up to spins of 65/2 using the EUROBALL
III spectrometer. One of the
negative-parity bands displays the highest rotational
frequency 1.85 MeV reported to date in nuclei heavier than 25.
At high frequencies, the experimental dynamic moment of inertia for all bands decrease to very low values, indicating
a lose of collectivity. The bands are described in the configuration-dependent cranked
Nilsson-Strutinsky model. The calculations indicate that
one of the negative-parity bands is observed up to its terminating single-particle state at spin 63/2.
This result establishes the first band termination in the
A =70 mass region.

Keywords: rotational bands; band termination; cranking calculations

Physical Review C, Vol. 62, 014313

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