Molybdenum-90m

Properties and data of the isotope ^90mMo.

Contents

See also: List of individual Molybdenum isotopes (and general data sources).

General data

Name of the isotope:Molybdenum-90m; Mo-90mSymbol:^90mMo or 90m42MoMass number A:90 (= number of nucleons)Atomic number Z:42 (= number of protons)Neutrons N:48Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1428571428571 (= neutron-proton ratio)Neutron excess (N-Z):6Excitation energy:2874.73(15) keVIsotopic mass:89.913931(4) u (atomic weight of Molybdenum-90m)Nuclide mass:89.8908917 u (calculated nuclear mass without electrons)Mass excess:-80.17276 MeVMass defect:0.83063631200001 u (per nucleus)Nuclear binding energy:773.73274081 MeV (per nucleus)
8.59703045 MeV (average binding energy per nucleon)Half-life:1.12(5) μsDecay constant λ:618881.41121424 s^-1Specific activity α:4.187630375200 × 10⁺²⁷ Bq g^-1
1.131791993297 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)8+Magnetic dipole moment:μ(μ_N) = -1.391(14)Quadrupole moment Q:0.58(3) barn (100 fm²)Nuclear g-factor:g_l = -0.173875

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
⁹⁰Mo		5.56(9) h	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 90) with Molybdenum-90m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 48	Isobar A = 90
26	⁷⁴Fe
27	⁷⁵Co
28	⁷⁶Ni
29	⁷⁷Cu
30	⁷⁸Zn
31	⁷⁹Ga
32	⁸⁰Ge	⁹⁰Ge
33	⁸¹As	⁹⁰As
34	⁸²Se	⁹⁰Se
35	⁸³Br	⁹⁰Br
36	⁸⁴Kr	⁹⁰Kr
37	⁸⁵Rb	⁹⁰Rb
38	⁸⁶Sr	⁹⁰Sr
39	⁸⁷Y	⁹⁰Y
40	⁸⁸Zr	⁹⁰Zr
41	⁸⁹Nb	⁹⁰Nb
42	⁹⁰Mo	⁹⁰Mo
43	⁹¹Tc	⁹⁰Tc
44	⁹²Ru	⁹⁰Ru
45	⁹³Rh	⁹⁰Rh
46	⁹⁴Pd	⁹⁰Pd
47	⁹⁵Ag
48	⁹⁶Cd
49	⁹⁷In
50	⁹⁸Sn