Bromine-77m

Properties and data of the isotope ^77mBr.

Contents

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

General data

Name of the isotope:Bromine-77m; Br-77mSymbol:^77mBr or 77m35BrMass number A:77 (= number of nucleons)Atomic number Z:35 (= number of protons)Neutrons N:42Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.2 (= neutron-proton ratio)Neutron excess (N-Z):7Excitation energy:105.86(8) keVIsotopic mass:76.921379(3) u (atomic weight of Bromine-77m)Nuclide mass:76.9021794 u (calculated nuclear mass without electrons)Mass excess:-73.23499 MeVMass defect:0.716423592 u (per nucleus)Nuclear binding energy:667.34427741 MeV (per nucleus)
8.6668088 MeV (average binding energy per nucleon)Half-life:4.28(10) minDecay constant λ:0.0026991712638627 s^-1Specific activity α:2.138788099483 × 10⁺¹⁹ Bq g^-1
578050837.69824 Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+

Radioactive Decay

Half-life T_½ = 4.28(10) min (minutes) respectively 2.568 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁷⁷Br	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
⁷⁷Br		57.04(12) h	3/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 42) and isobaric (same nucleon number A = 77) with Bromine-77m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 42	Isobar A = 77
21	⁶³Sc
22	⁶⁴Ti
23	⁶⁵V
24	⁶⁶Cr
25	⁶⁷Mn
26	⁶⁸Fe
27	⁶⁹Co
28	⁷⁰Ni	⁷⁷Ni
29	⁷¹Cu	⁷⁷Cu
30	⁷²Zn	⁷⁷Zn
31	⁷³Ga	⁷⁷Ga
32	⁷⁴Ge	⁷⁷Ge
33	⁷⁵As	⁷⁷As
34	⁷⁶Se	⁷⁷Se
35	⁷⁷Br	⁷⁷Br
36	⁷⁸Kr	⁷⁷Kr
37	⁷⁹Rb	⁷⁷Rb
38	⁸⁰Sr	⁷⁷Sr
39	⁸¹Y	⁷⁷Y
40	⁸²Zr	⁷⁷Zr
41	⁸³Nb
42	⁸⁴Mo
43	⁸⁵Tc
44	⁸⁶Ru