Bromine-74m

Properties and data of the isotope ^74mBr.

Contents

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

General data

Name of the isotope:Bromine-74m; Br-74mSymbol:^74mBr or 74m35BrMass number A:74 (= number of nucleons)Atomic number Z:35 (= number of protons)Neutrons N:39Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.1142857142857 (= neutron-proton ratio)Neutron excess (N-Z):4Excitation energy:13.58(21) keVIsotopic mass:73.929910(6) u (atomic weight of Bromine-74m)Nuclide mass:73.9107104 u (calculated nuclear mass without electrons)Mass excess:-65.28841 MeVMass defect:0.68189784399999 u (per nucleus)Nuclear binding energy:635.1837503 MeV (per nucleus)
8.58356419 MeV (average binding energy per nucleon)Half-life:46(2) minDecay constant λ:0.00025114028281157 s^-1Specific activity α:2.071783779035 × 10⁺¹⁸ Bq g^-1
55994156.190138 Ci g^-1Spin and parity:
(nuclear angular momentum)4(+)Magnetic dipole moment:μ(μ_N) = 1.820(12)Nuclear g-factor:g_l = 0.455

Radioactive Decay

Half-life T_½ = 46(2) min (minutes) respectively 2.760 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁴Se	100 %

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
⁷⁴Br		25.4(3) min	(0-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 39) and isobaric (same nucleon number A = 74) with Bromine-74m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 39	Isobar A = 74
19	⁵⁸K
21	⁶⁰Sc
22	⁶¹Ti
23	⁶²V
24	⁶³Cr
25	⁶⁴Mn
26	⁶⁵Fe	⁷⁴Fe
27	⁶⁶Co	⁷⁴Co
28	⁶⁷Ni	⁷⁴Ni
29	⁶⁸Cu	⁷⁴Cu
30	⁶⁹Zn	⁷⁴Zn
31	⁷⁰Ga	⁷⁴Ga
32	⁷¹Ge	⁷⁴Ge
33	⁷²As	⁷⁴As
34	⁷³Se	⁷⁴Se
35	⁷⁴Br	⁷⁴Br
36	⁷⁵Kr	⁷⁴Kr
37	⁷⁶Rb	⁷⁴Rb
38	⁷⁷Sr	⁷⁴Sr
39	⁷⁸Y
40	⁷⁹Zr
42	⁸¹Mo