Berkelium-248m
Properties and data of the isotope 248mBk.
See also: list of Berkelium isotopes.
General data
Name of the isotope:Berkelium-248m; Bk-248mSymbol:248mBk or 248m97BkMass number A:248 (= number of nucleons)Atomic number Z:97 (= number of protons)Neutrons N:151Isotopic mass:248.07309(8) u (atomic weight of Berkelium-248m)
Excitation energy: +x keVNuclide mass:248.0198853 u (calculated nuclear mass without electrons)Mass excess:68.0829 MeVMass defect:1.99434042 u (per nucleus)Nuclear binding energy:1857.71613519 MeV (per nucleus)
7.49079087 MeV (average binding energy per nucleon)Half-life:23.7(2) hDecay constant λ:8.124087910922 × 10-6 s-1Specific activity α:1.972758135406 × 10+16 Bq g-1
533177.87443424 Ci g-1Spin and parity:
(nuclear angular momentum)1(-)
Radioactive Decay
Half-life T½ = 23.7(2) h (hours) respectively 8.5320 × 104 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 248Cf | 70(5) % | | |
EC/β+ | 248Cm | 30(5) % | | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
248Bk | | > 9 a | (6+,8-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 151) and isobaric (same nucleon number A = 248) with Berkelium-248m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 151 | Isobar A = 248 |
92 | 243U | |
93 | 244Np | |
94 | 245Pu | |
95 | 246Am | 248Am |
96 | 247Cm | 248Cm |
97 | 248Bk | 248Bk |
98 | 249Cf | 248Cf |
99 | 250Es | 248Es |
100 | 251Fm | 248Fm |
101 | 252Md | 248Md |
102 | 253No | |
103 | 254Lr | |
104 | 255Rf | |
105 | 256Db | |
External data and identifiers
Last update: 2020-10-26
Perma link: https://www.chemlin.org/isotope/berkelium-248m
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