Return of collective rotation in 157Er and 158Er at ultrahigh spin.
A new frontier of discrete-line gamma-ray spectroscopy at ultrahigh spin has been opened in the rare-earth nuclei (157,158) Er. Four rotational structures, displaying high moments of inertia, have been identified, which extend up to spin approximately 65 variant Planck's over 2pi and bypass the band-terminating states in these nuclei which occur at approximately 45 variant Planck's over 2pi. Cranked Nilsson-Strutinsky calculations suggest that these structures arise from well-deformed triaxial configurations that lie in a valley of favored shell energy which also includes the triaxial strongly deformed bands in (161-167) Lu.
Paul
E S
ES
Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK.
Twin
P J
PJ
Evans
A O
AO
Pipidis
A
A
Riley
M A
MA
Simpson
J
J
Appelbe
D E
DE
Campbell
D B
DB
Choy
P T W
PT
Clark
R M
RM
Cromaz
M
M
Fallon
P
P
Görgen
A
A
Joss
D T
DT
Lee
I Y
IY
Macchiavelli
A O
AO
Nolan
P J
PJ
Ward
D
D
Ragnarsson
I
I