Effect of a triaxial nuclear shape on proton tunneling: the decay and structure of 145Tm.
Gamma rays deexciting states in the proton emitter 145Tm were observed using the recoil-decay tagging method. The 145Tm ground-state rotational band was found to exhibit the properties expected for an h{11/2} proton decoupled band. In addition, coincidences between protons feeding the 2{+} state in 144Er and the 2{+}-->0{+} gamma-ray transition were detected, the first measurement of this kind, leading to a more precise value for the 2{+} excitation energy of 329(1) keV. Calculations with the particle-rotor model and the core quasiparticle coupling model indicate that the properties of the pi{11/2} band and the proton-decay rates in 145Tm are consistent with the presence of triaxiality with an asymmetry parameter gamma approximately 20 degrees .
Seweryniak
D
D
Argonne National Laboratory, Argonne, IL 60439, USA.
Blank
B
B
Carpenter
M P
MP
Davids
C N
CN
Davinson
T
T
Freeman
S J
SJ
Hammond
N
N
Hoteling
N
N
Janssens
R V F
RV
Khoo
T L
TL
Liu
Z
Z
Mukherjee
G
G
Robinson
A
A
Scholey
C
C
Sinha
S
S
Shergur
J
J
Starosta
K
K
Walters
W B
WB
Woehr
A
A
Woods
P J
PJ
D005720:Gamma Rays; D011522:Protons
D011522:Protons