Bromine-81m

Properties and data of the isotope ^81mBr.

Contents

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

General data

Name of the isotope:Bromine-81m; Br-81mSymbol:^81mBr or 81m35BrMass number A:81 (= number of nucleons)Atomic number Z:35 (= number of protons)Neutrons N:46Isotopic mass:80.91690(9) u (atomic weight of Bromine-81m)
Excitation energy: 536.20(9) keVNuclide mass:80.8977004 u (calculated nuclear mass without electrons)Mass excess:-77.40715 MeVMass defect:0.755562256 u (per nucleus)Nuclear binding energy:703.80170809 MeV (per nucleus)
8.68890998 MeV (average binding energy per nucleon)Half-life:34.6(28) μsDecay constant λ:20033.155507513 s^-1Specific activity α:1.508031054190 × 10⁺²⁶ Bq g^-1
4.075759605921 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μ_N) = 5.694(45)Nuclear g-factor:g_l = 1.2653333333333

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
⁸¹Br		stable	3/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 46) and isobaric (same nucleon number A = 81) with Bromine-81m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 46	Isobar A = 81
25	⁷¹Mn
26	⁷²Fe
27	⁷³Co
28	⁷⁴Ni
29	⁷⁵Cu	⁸¹Cu
30	⁷⁶Zn	⁸¹Zn
31	⁷⁷Ga	⁸¹Ga
32	⁷⁸Ge	⁸¹Ge
33	⁷⁹As	⁸¹As
34	⁸⁰Se	⁸¹Se
35	⁸¹Br	⁸¹Br
36	⁸²Kr	⁸¹Kr
37	⁸³Rb	⁸¹Rb
38	⁸⁴Sr	⁸¹Sr
39	⁸⁵Y	⁸¹Y
40	⁸⁶Zr	⁸¹Zr
41	⁸⁷Nb	⁸¹Nb
42	⁸⁸Mo	⁸¹Mo
43	⁸⁹Tc
44	⁹⁰Ru
45	⁹¹Rh
46	⁹²Pd
47	⁹³Ag
48	⁹⁴Cd