Xenon-115

Properties and data of the isotope ¹¹⁵Xe.

Content

General data

Name of the isotope:Xenon-115; Xe-115Symbol:¹¹⁵Xe or 11554XeMass number A:115 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:61Isotopic mass:114.926294(13) u (atomic weight of Xenon-115)Nuclide mass:114.8966726 u (calculated nuclear mass without electrons)Mass excess:-68.6567 MeVMass defect:1.024817604 u (per nucleus)Nuclear binding energy:954.61144922 MeV (per nucleus)
8.30096912 MeV (average binding energy per nucleon)Separation energy:S_N = 9.642(16) MeV (first neutron)
S_P = 3.15(15) MeV (first proton)Half-life:18(4) sDecay constant λ:0.038508176697775 s^-1Specific activity α:2.03422512573 × 10⁺²⁰ Bq g^-1
5497905745.2189 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1969

Radioactive Decay

Half-life T_½ = 18(4) s respectively 1.8 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy
EE/β⁺	¹¹⁵I	99.65 %	7.68(3) MeV
β⁺, p	¹¹⁴Te	0.34(6) %
α	¹¹¹Te	0.0003(1) %	2,506(14) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 61) and isobaric (same nucleon number A = 115) with Xenon-115. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 61	Isobar A = 115
34	⁹⁵Se
35	⁹⁶Br
36	⁹⁷Kr
37	⁹⁸Rb
38	⁹⁹Sr
39	¹⁰⁰Y
40	¹⁰¹Zr
41	¹⁰²Nb	¹¹⁵Nb
42	¹⁰³Mo	¹¹⁵Mo
43	¹⁰⁴Tc	¹¹⁵Tc
44	¹⁰⁵Ru	¹¹⁵Ru
45	¹⁰⁶Rh	¹¹⁵Rh
46	¹⁰⁷Pd	¹¹⁵Pd
47	¹⁰⁸Ag	¹¹⁵Ag
48	¹⁰⁹Cd	¹¹⁵Cd
49	¹¹⁰In	¹¹⁵In
50	¹¹¹Sn	¹¹⁵Sn
51	¹¹²Sb	¹¹⁵Sb
52	¹¹³Te	¹¹⁵Te
53	¹¹⁴I	¹¹⁵I
54	¹¹⁵Xe	¹¹⁵Xe
55	¹¹⁶Cs	¹¹⁵Cs
56	¹¹⁷Ba	¹¹⁵Ba
57	¹¹⁸La
58	¹¹⁹Ce