55-Cs-121
 basic

 element
55-cesium-121

  • Atomic Mass: 120.9171836 +- 0.0000152 amu
  • Excess Mass: -77142.934 +- 14.128 keV
  • Binding Energy: 1010743.556 +- 14.129 keV
  • Beta Decay Energy: B- -6802.021 +- 303.531 keV
"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.
  • Spin: 3/2(+)
  • Half life: 128 s
  • Mode of decay: Electron capture to Xe-121
    • Decay energy: 5.400 MeV

    Meta state at 0.068 Mev
  • Spin: 9/2(+)
  • Half life: 122 s
  • Mode of decay: Electron capture to Xe-121
    • Branch ratio: 83.00 %
    • Decay energy: 5.469 MeV
  • Mode of decay: IT
    • Branch ratio: 17.00 %
    • Decay energy: 0.068 MeV

  • Possible parent nuclides:
    Electron capture from Ba-121
    EC + P from La-122
R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)
Magnetic Dipole Moments and Electric Quadrupole Moments
Ex(kev)T1/2Spin    m(nm)    Q(b)    Ref. Std.MethodReference
02.27 m3/2+ +0.770(4) [133Cs]ABLSNP A468 1 (87)
0.79(2) [133Cs]ABNP A292 144 (77)
+0.838(9) st ABLSNP A468 1 (87)
~362.02 m9/2+ +5.41(3) [133Cs]ABLSNP A468 1 (87)
+2.69(5) st ABLSNP A468 1 (87)
N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published.  2000 Courtesy of T. Burrows at BNL/NNDC.