Zirconium-90m2

Properties and data of the isotope ^90m2Zr.

Contents

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

General data

Name of the isotope:Zirconium-90m2; Zr-90m2Symbol:^90m2Zr or 90m240ZrMass number A:90 (= number of nucleons)Atomic number Z:40 (= number of protons)Neutrons N:50Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.25 (= neutron-proton ratio)Neutron excess (N-Z):10Excitation energy:3589.419(16) keVIsotopic mass:89.90470(2) u (atomic weight of Zirconium-90m2)Nuclide mass:89.8827578 u (calculated nuclear mass without electrons)Mass excess:-88.77138 MeVMass defect:0.84154707999998 u (per nucleus)Nuclear binding energy:783.89605574 MeV (per nucleus)
8.70995617 MeV (average binding energy per nucleon)Half-life:131(4) nsDecay constant λ:5291199.8516026 s^-1Specific activity α:3.580264137576 × 10⁺²⁸ Bq g^-1
9.676389561016 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)8+Magnetic dipole moment:μ(μ_N) = -10.85(6)Quadrupole moment Q:0.51(3) barn (100 fm²)Nuclear g-factor:g_l = -1.35625

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
⁹⁰Zr		stable	0+
^90m1Zr	2319.00(1) keV	809.2(20) ms	5-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 50) and isobaric (same nucleon number A = 90) with Zirconium-90m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 50	Isobar A = 90
28	⁷⁸Ni
29	⁷⁹Cu
30	⁸⁰Zn
31	⁸¹Ga
32	⁸²Ge	⁹⁰Ge
33	⁸³As	⁹⁰As
34	⁸⁴Se	⁹⁰Se
35	⁸⁵Br	⁹⁰Br
36	⁸⁶Kr	⁹⁰Kr
37	⁸⁷Rb	⁹⁰Rb
38	⁸⁸Sr	⁹⁰Sr
39	⁸⁹Y	⁹⁰Y
40	⁹⁰Zr	⁹⁰Zr
41	⁹¹Nb	⁹⁰Nb
42	⁹²Mo	⁹⁰Mo
43	⁹³Tc	⁹⁰Tc
44	⁹⁴Ru	⁹⁰Ru
45	⁹⁵Rh	⁹⁰Rh
46	⁹⁶Pd	⁹⁰Pd
47	⁹⁷Ag
48	⁹⁸Cd
49	⁹⁹In
50	¹⁰⁰Sn