Bromine-77

Properties and data of the isotope ⁷⁷Br.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Bromine-77; Br-77Symbol:⁷⁷Br or 7735BrMass 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):7Isotopic mass:76.921379(3) u (atomic weight of Bromine-77)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)Separation energy:S_N = 11.017(10) MeV (first neutron)
S_P = 5.2718(28) MeV (first proton)Half-life:57.04(12) hDecay constant λ:3.375541435639 × 10^-6 s^-1Specific activity α:2.674735000522 × 10⁺¹⁶ Bq g^-1
722901.35149268 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μ_N) = 0.9731(6)Quadrupole moment Q:0.530(22) barn (100 fm²)Nuclear g-factor:g_l = 0.64873333333333Year of discovery:1948

Radioactive Decay

Half-life T_½ = 57.04(12) h (hours) respectively 2.05344 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁷Se	100 %	1.3647(28) MeV

Parent Nuclides

Direct parent isotope is: ⁷⁷Kr.

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
^77mBr	105.86(8) keV	4.28(10) min	9/2+

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-77. 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