Zirconium-87

Properties and data of the isotope ⁸⁷Zr.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Zirconium-87; Zr-87Symbol:⁸⁷Zr or 8740ZrMass number A:87 (= number of nucleons)Atomic number Z:40 (= number of protons)Neutrons N:47Isotopic mass:86.914817(4) u (atomic weight of Zirconium-87)Nuclide mass:86.8928748 u (calculated nuclear mass without electrons)Mass excess:-79.34745 MeVMass defect:0.805435332 u (per nucleus)Nuclear binding energy:750.25817915 MeV (per nucleus)
8.62365723 MeV (average binding energy per nucleon)Separation energy:S_N = 9.449(5) MeV (first neutron)
S_P = 7.353(15) MeV (first proton)Half-life:1.68(1) hDecay constant λ:0.00011460766874338 s^-1Specific activity α:8.025389823274 × 10⁺¹⁷ Bq g^-1
21690242.765606 Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μ_N) = -0.894(5)Quadrupole moment Q:+0.423(48) barn (100 fm²)Nuclear g-factor:g_l = -0.19866666666667Charge radius:4.2789(30) femtometer fmYear of discovery:1948

Radioactive Decay

Half-life T_½ = 1.68(1) h (hours) respectively 6.048 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁸⁷Y	100 %	3.671(4) MeV

Parent Nuclides

Direct parent isotope is: ⁸⁷Nb.

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
^87mZr	335.84(19)	14.0(2) s	1/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 47) and isobaric (same nucleon number A = 87) with Zirconium-87. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 47	Isobar A = 87
26	⁷³Fe
27	⁷⁴Co
28	⁷⁵Ni
29	⁷⁶Cu
30	⁷⁷Zn
31	⁷⁸Ga	⁸⁷Ga
32	⁷⁹Ge	⁸⁷Ge
33	⁸⁰As	⁸⁷As
34	⁸¹Se	⁸⁷Se
35	⁸²Br	⁸⁷Br
36	⁸³Kr	⁸⁷Kr
37	⁸⁴Rb	⁸⁷Rb
38	⁸⁵Sr	⁸⁷Sr
39	⁸⁶Y	⁸⁷Y
40	⁸⁷Zr	⁸⁷Zr
41	⁸⁸Nb	⁸⁷Nb
42	⁸⁹Mo	⁸⁷Mo
43	⁹⁰Tc	⁸⁷Tc
44	⁹¹Ru	⁸⁷Ru
45	⁹²Rh
46	⁹³Pd
47	⁹⁴Ag
48	⁹⁵Cd
49	⁹⁶In