Krypton-71

Properties and data of the isotope ⁷¹Kr.

Contents

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

General data

Name of the isotope:Krypton-71; Kr-71Symbol:⁷¹Kr or 7136KrMass number A:71 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:35Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):0.97222222222222 (= neutron-proton ratio)Neutron excess (N-Z):-1Isotopic mass:70.95027(14) u (atomic weight of Krypton-71)Nuclide mass:70.9305219 u (calculated nuclear mass without electrons)Mass excess:-46.3232 MeVMass defect:0.63470321199999 u (per nucleus)Nuclear binding energy:591.22223376 MeV (per nucleus)
8.32707371 MeV (average binding energy per nucleon)Separation energy:S_N = 13.30(24) MeV (first neutron)
S_P = 2.19(13) MeV (first proton)Half-life:100(3) msDecay constant λ:6.9314718055995 s^-1Specific activity α:5.963185654285 × 10⁺²² Bq g^-1
1611671798455.6 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Mirror nucleus:Bromine-71Year of discovery:1981

Radioactive Decay

Half-life T_½ = 100(3) ms respectively 1.00 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷¹Br	97.9 %	10.18(13) MeV
EC, p	⁷⁰Se	2.1(7) %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 35) and isobaric (same nucleon number A = 71) with Krypton-71. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 35	Isobar A = 71
17	⁵²Cl
18	⁵³Ar
19	⁵⁴K
20	⁵⁵Ca
21	⁵⁶Sc
22	⁵⁷Ti
23	⁵⁸V
24	⁵⁹Cr
25	⁶⁰Mn	⁷¹Mn
26	⁶¹Fe	⁷¹Fe
27	⁶²Co	⁷¹Co
28	⁶³Ni	⁷¹Ni
29	⁶⁴Cu	⁷¹Cu
30	⁶⁵Zn	⁷¹Zn
31	⁶⁶Ga	⁷¹Ga
32	⁶⁷Ge	⁷¹Ge
33	⁶⁸As	⁷¹As
34	⁶⁹Se	⁷¹Se
35	⁷⁰Br	⁷¹Br
36	⁷¹Kr	⁷¹Kr
37	⁷²Rb	⁷¹Rb
38	⁷³Sr