58Ni: an unpaired band crossing at new heights of angular momentum for rotating nuclei.
High-spin states in 58Ni have been investigated by means of the fusion-evaporation reaction 28Si(32S, 2p)58Ni at 130 MeV beam energy. Discrete-energy levels are observed in 58Ni at record-breaking 42 MeV excitation energy and angular momenta in excess of 30h. The states form regular rotational bands with unprecedented high rotational frequencies. A comparison with configuration dependent cranked Nilsson-Strutinsky calculations reveals an exceptional two-band crossing scenario, the interaction strength of which is strongly shape dependent.
Rudolph
D
D
Department of Physics, Lund University, S-22100 Lund, Sweden.
Carlsson
B G
BG
Ragnarsson
I
I
Aberg
S
S
Andreoiu
C
C
Bentley
M A
MA
Carpenter
M P
MP
Charity
R J
RJ
Clark
R M
RM
Cromaz
M
M
Ekman
J
J
Fahlander
C
C
Fallon
P
P
Ideguchi
E
E
Macchiavelli
A O
AO
Mineva
M N
MN
Reviol
W
W
Sarantites
D G
DG
Seweryniak
D
D
Williams
S J
SJ