Lowest excitations in 56Ti and the predicted N=34 shell closure.
Recent experimental characterization of the subshell closure at N=32 in the Ca, Ti, and Cr isotones has stimulated shell-model calculations that indicated the possibility that the N=34 isotones of these same elements could exhibit characteristics of a shell closure, namely, a high energy for the first excited 2(+) level. To that end, we have studied the decay of 56Sc produced in fragmentation reactions and identified new gamma rays in the daughter N=34 isotone 56Ti. The first 2(+) level is found at an energy of 1127 keV, well below the expected position that would indicate the presence of an N=34 shell closure in 56Ti.
National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA.
S N
SN
Liddick
P F
PF
Mantica
R V F
RV
Janssens
R
R
Broda
B A
BA
Brown
M P
MP
Carpenter
B
B
Fornal
M
M
Honma
T
T
Mizusaki
A C
AC
Morton
W F
WF
Mueller
T
T
Otsuka
J
J
Pavan
A
A
Stolz
S L
SL
Tabor
B E
BE
Tomlin
M
M
Wiedeking