Iodine-115

Properties and data of the isotope ¹¹⁵I.

Content

General data

Name of the isotope:Iodine-115; I-115Other names:Jod-115Symbol:¹¹⁵I or 11553IMass number A:115 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:62Isotopic mass:114.91805(3) u (atomic weight of Iodine-115)Nuclide mass:114.8889771 u (calculated nuclear mass without electrons)Mass excess:-76.33593 MeVMass defect:1.033901488 u (per nucleus)Nuclear binding energy:963.07303266 MeV (per nucleus)
8.37454811 MeV (average binding energy per nucleon)Separation energy:S_N = 11.61(15) MeV (first neutron)
S_P = 1.74(4) MeV (first proton)Half-life:1.3(2) minDecay constant λ:0.0088865023148711 s^-1Specific activity α:4.694365674763 × 10⁺¹⁹ Bq g^-1
1268747479.6659 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1969

Radioactive Decay

Half-life T_½ = 1.3(2) min (minutes) respectively 7.8 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹¹⁵Te	100 %	5.72(5) MeV

Parent Nuclides

Direct parent isotope is: ¹¹⁵Xe.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 62) and isobaric (same nucleon number A = 115) with Iodine-115. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 62	Isobar A = 115
35	⁹⁷Br
36	⁹⁸Kr
37	⁹⁹Rb
38	¹⁰⁰Sr
39	¹⁰¹Y
40	¹⁰²Zr
41	¹⁰³Nb	¹¹⁵Nb
42	¹⁰⁴Mo	¹¹⁵Mo
43	¹⁰⁵Tc	¹¹⁵Tc
44	¹⁰⁶Ru	¹¹⁵Ru
45	¹⁰⁷Rh	¹¹⁵Rh
46	¹⁰⁸Pd	¹¹⁵Pd
47	¹⁰⁹Ag	¹¹⁵Ag
48	¹¹⁰Cd	¹¹⁵Cd
49	¹¹¹In	¹¹⁵In
50	¹¹²Sn	¹¹⁵Sn
51	¹¹³Sb	¹¹⁵Sb
52	¹¹⁴Te	¹¹⁵Te
53	¹¹⁵I	¹¹⁵I
54	¹¹⁶Xe	¹¹⁵Xe
55	¹¹⁷Cs	¹¹⁵Cs
56	¹¹⁸Ba	¹¹⁵Ba
57	¹¹⁹La
58	¹²⁰Ce
59	¹²¹Pr