Berkelium-253

Properties and data of the isotope ²⁵³Bk.

Content

General data

Name of the isotope:Berkelium-253; Bk-253Symbol:²⁵³Bk or 25397BkMass number A:253 (= number of nucleons)Atomic number Z:97 (= number of protons)Neutrons N:156Isotopic mass:253.08688(38) u (atomic weight of Berkelium-253)Nuclide mass:253.0336753 u (calculated nuclear mass without electrons)Mass excess:80.9282 MeVMass defect:2.023875 u (per nucleus)Nuclear binding energy:1885.22741925 MeV (per nucleus)
7.45149178 MeV (average binding energy per nucleon)Separation energy:S_N = 5.68(41) MeV (first neutron)
S_P = 5.42(47) MeV (first proton)Half-life:10 minDecay constant λ:0.0011552453009332 s^-1Specific activity α:2.749822106719 × 10⁺¹⁸ Bq g^-1
74319516.397822 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1991

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 156) and isobaric (same nucleon number A = 253) with Berkelium-253. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 156	Isobar A = 253
96	²⁵²Cm
97	²⁵³Bk	²⁵³Bk
98	²⁵⁴Cf	²⁵³Cf
99	²⁵⁵Es	²⁵³Es
100	²⁵⁶Fm	²⁵³Fm
101	²⁵⁷Md	²⁵³Md
102	²⁵⁸No	²⁵³No
103	²⁵⁹Lr	²⁵³Lr
104	²⁶⁰Rf	²⁵³Rf
105	²⁶¹Db
106	²⁶²Sg
107	²⁶³Bh
108	²⁶⁴Hs