19-K-40
 basic
 n-XS summary
 XS graphs

 element
19-potassium-40

  • Atomic Mass: 39.9639987 +- 0.0000003 amu
  • Excess Mass: -33535.016 +- 0.271 keV
  • Binding Energy: 341523.214 +- 0.276 keV
  • Beta Decay Energy: B- 1311.093 +- 0.118 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.
  • Atomic Percent Abundance: 0.0117%
  • Spin: 4-
  • Half life: 1.277E+9 years
  • Mode of decay: Beta to Ca-40
    • Branch ratio: 89.28 %
    • Decay energy: 1.311 MeV
  • Mode of decay: Electron capture to Ar-40
    • Branch ratio: 10.72 %
    • Decay energy: 1.505 MeV
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
01.28 x 109 y4- -1.298100(3) [2H]NZNat 29a 1754 (74)
-1.2982(4) AB/DPR 86 73 (52)
-0.061(5) st [39K]"Q, OL"PR B6 757 (72)/PR A3 837 (71)
304.30 ns3- -1.29(9) [19F 197]TDPADPL 49B 261 (74)
25431 ns7+ +4.1(7) IPAD/IMPADNP A264 151 (76)
+4.4(11) [41K 1294]RIGVZP A301 243 (81)
N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published.  2000 Courtesy of T. Burrows at BNL/NNDC.