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Berkelium-248m

Properties and data of the isotope 248mBk.


Contents

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 keV
Nuclide 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-1
Spin and parity:
(nuclear angular momentum)
1(-)

 

Radioactive Decay

Half-life T½ = 23.7(2) h (hours) respectively 8.5320 × 104 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
β-248Cf70(5) %
EC/β+248Cm30(5) %

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
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.

 

ZIsotone N = 151Isobar A = 248
92243U
93244Np
94245Pu
95246Am248Am
96247Cm248Cm
97248Bk248Bk
98249Cf248Cf
99250Es248Es
100251Fm248Fm
101252Md248Md
102253No
103254Lr
104255Rf
105256Db

 

External data and identifiers

Adopted Levels, Gammas:NuDat 248Bk

 


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Last update: 2020-10-26


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