Bromine-73

Properties and data of the isotope ⁷³Br.

Content

General data

Name of the isotope:Bromine-73; Br-73Symbol:⁷³Br or 7335BrMass number A:73 (= number of nucleons)Atomic number Z:35 (= number of protons)Neutrons N:38Isotopic mass:72.931672(8) u (atomic weight of Bromine-73)Nuclide mass:72.9124724 u (calculated nuclear mass without electrons)Mass excess:-63.64712 MeVMass defect:0.67147092799999 u (per nucleus)Nuclear binding energy:625.47114061 MeV (per nucleus)
8.56809782 MeV (average binding energy per nucleon)Separation energy:S_N = 12.657(7) MeV (first neutron)
S_P = 3.068(8) MeV (first proton)Half-life:3.4(2) minDecay constant λ:0.0033977802968625 s^-1Specific activity α:2.841932160947 × 10⁺¹⁹ Bq g^-1
768089773.22911 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Mirror nucleus:Strontium-73Year of discovery:1970

Radioactive Decay

Half-life T_½ = 3.4(2) min (minutes) respectively 2.04 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	⁷³Se	100 %	4.58(1) MeV

Parent Nuclides

Direct parent isotope is: ⁷³Kr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 38) and isobaric (same nucleon number A = 73) with Bromine-73. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 38	Isobar A = 73
20	⁵⁸Ca
21	⁵⁹Sc
22	⁶⁰Ti
23	⁶¹V
24	⁶²Cr
25	⁶³Mn
26	⁶⁴Fe	⁷³Fe
27	⁶⁵Co	⁷³Co
28	⁶⁶Ni	⁷³Ni
29	⁶⁷Cu	⁷³Cu
30	⁶⁸Zn	⁷³Zn
31	⁶⁹Ga	⁷³Ga
32	⁷⁰Ge	⁷³Ge
33	⁷¹As	⁷³As
34	⁷²Se	⁷³Se
35	⁷³Br	⁷³Br
36	⁷⁴Kr	⁷³Kr
37	⁷⁵Rb	⁷³Rb
38	⁷⁶Sr	⁷³Sr
39	⁷⁷Y
40	⁷⁸Zr