https://doi.org/10.1140/epja/i2009-10881-7
Regular Article - Experimental Physics
Identification of 
and 
isomeric states in 127Sb
1
Department of Nuclear Physics, R.S.Phys.S.E., Australian National University, ACT 0200, Canberra, Australia
2
Nuclear Engineering Division, Argonne National Laboratory, 60439, Argonne, IL, USA
3
RIKEN Nishina Center, 2-1 Hirosawa, 351-0198, Wako, Saitama, Japan
4
Physics Division, Argonne National Laboratory, 60439, Argonne, IL, USA
5
Department of Physics, University of Massachusetts Lowell, 01854, Lowell, MA, USA
* e-mail: hiroshi@ribf.riken.jp
Received:
4
August
2009
Revised:
2
September
2009
Accepted:
24
September
2009
Published online:
13
October
2009
The nucleus 
, which is on the neutron-rich periphery of the 
-stability region, has been populated in complex nuclear reactions involving deep-inelastic and fusion-fission processes with 
beams incident on thick targets. The previously known isomer at 2325 keV in 
has been assigned spin and parity 
, based on the measured 
- angular correlations and total internal conversion coefficients. The half-life has been determined to be 234(12) ns, somewhat longer than the value reported previously. The 2194 keV state has been assigned 
and identified as an isomer with 
, decaying by two 
branches. The observed level energies and transition strengths are compared with the predictions of a shell model calculation. Two 
states have been identified close in energy, and their properties are discussed in terms of mixing between vibrational and three-quasiparticle configurations.
PACS: 21.10.Hw Spin, parity, and isobaric spin – / 21.10.Tg Lifetimes, widths – / 21.60.Cs Shell model – / 27.60.+j 
–
© SIF, Springer-Verlag Berlin Heidelberg, 2009
