Krypton-77m

Properties and data of the isotope ^77mKr.

Contents

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

General data

Name of the isotope:Krypton-77m; Kr-77mSymbol:^77mKr or 77m36KrMass number A:77 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:41Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1388888888889 (= neutron-proton ratio)Neutron excess (N-Z):5Isotopic mass:76.9246700(21) u (atomic weight of Krypton-77m)Nuclide mass:76.9049219 u (calculated nuclear mass without electrons)Mass excess:-70.16944 MeVMass defect:0.71229270799999 u (per nucleus)Nuclear binding energy:663.49638375 MeV (per nucleus)
8.61683615 MeV (average binding energy per nucleon)Half-life:118(12) nsDecay constant λ:5874128.6488131 s^-1Specific activity α:4.654582914808 × 10⁺²⁸ Bq g^-1
1.257995382380 × 10⁺¹⁸ Ci g^-1Spin and parity:
(nuclear angular momentum)3/2-

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
⁷⁷Kr		74.4(6) min	5/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 41) and isobaric (same nucleon number A = 77) with Krypton-77m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 41	Isobar A = 77
21	⁶²Sc
22	⁶³Ti
23	⁶⁴V
24	⁶⁵Cr
25	⁶⁶Mn
26	⁶⁷Fe
27	⁶⁸Co
28	⁶⁹Ni	⁷⁷Ni
29	⁷⁰Cu	⁷⁷Cu
30	⁷¹Zn	⁷⁷Zn
31	⁷²Ga	⁷⁷Ga
32	⁷³Ge	⁷⁷Ge
33	⁷⁴As	⁷⁷As
34	⁷⁵Se	⁷⁷Se
35	⁷⁶Br	⁷⁷Br
36	⁷⁷Kr	⁷⁷Kr
37	⁷⁸Rb	⁷⁷Rb
38	⁷⁹Sr	⁷⁷Sr
39	⁸⁰Y	⁷⁷Y
40	⁸¹Zr	⁷⁷Zr
41	⁸²Nb
42	⁸³Mo
44	⁸⁵Ru