Indium-115

Properties and data of the isotope ¹¹⁵In.

Content

General Data

Radioactive Decay

Parent Nuclides

NMR Data

Isotones und Isobares

General data

Name of the isotope:Indium-115; In-115Symbol:¹¹⁵In or 11549InMass number A:115 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:66Isotopic mass:114.903878773(12) u (atomic weight of Indium-115)Nuclide mass:114.8769999 u (calculated nuclear mass without electrons)Mass excess:-89.53635 MeVMass defect:1.051432251 u (per nucleus)Nuclear binding energy:979.40283321 MeV (per nucleus)
8.51654638 MeV (average binding energy per nucleon)Separation energy:S_N = 9.0379(3) MeV (first neutron)
S_P = 6.81038(28) MeV (first proton)Half-life:4.41(25) × 10¹⁴ aDecay constant λ:4.98402560310 × 10^-23 s^-1Specific activity α:0.26328512483705 Bq g^-1
7.115814184785 × 10^-12 Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μ_N) = +5.5326(4)Charge radius:4.6156(26) femtometer fmYear of discovery:1924

Radioactive Decay

Half-life T_½ = 4.41(25) × 10¹⁴ a respectively 1.3907376 × 10²² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹⁵Sn	100 %	0.497489(10) MeV

Parent Nuclides

Direct parent isotope is: ¹¹⁵Cd.

Occurrence

Comparison of the natural Indium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Indium Isotopic mixture	114.818 u	100 %
Isotope ¹¹³In	112.904062(6) u	4.281(52) %	stable	9/2+
Isotope ¹¹⁵In	114.903878773(12) u	95.719(52) %	4.41(25) × 10¹⁴ a	9/2+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ¹¹⁵In

Isotope:¹¹⁵In-NMRQuantity:95.719(52) %Spin:9/2+Nuclearmagnetic moment
μ/μ_N:+5.5326(4)Gyromagnetic ratio γ:5.8971 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 1.2294666666667Quadrupole moment Q:+ 0.772(5) barn (100 fm²)Resonance frequency:v₀ = 9.3856 at 1 TRelative Sensitivity:0.35348 (H₀ = const.)
7.2745 (v₀ = const.)
[related to ¹H = 1.000]

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
^115mIn	336.244(17) keV	4.486(4) h	1/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 66) and isobaric (same nucleon number A = 115) with Indium-115. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 66	Isobar A = 115
37	¹⁰³Rb
38	¹⁰⁴Sr
39	¹⁰⁵Y
40	¹⁰⁶Zr
41	¹⁰⁷Nb	¹¹⁵Nb
42	¹⁰⁸Mo	¹¹⁵Mo
43	¹⁰⁹Tc	¹¹⁵Tc
44	¹¹⁰Ru	¹¹⁵Ru
45	¹¹¹Rh	¹¹⁵Rh
46	¹¹²Pd	¹¹⁵Pd
47	¹¹³Ag	¹¹⁵Ag
48	¹¹⁴Cd	¹¹⁵Cd
49	¹¹⁵In	¹¹⁵In
50	¹¹⁶Sn	¹¹⁵Sn
51	¹¹⁷Sb	¹¹⁵Sb
52	¹¹⁸Te	¹¹⁵Te
53	¹¹⁹I	¹¹⁵I
54	¹²⁰Xe	¹¹⁵Xe
55	¹²¹Cs	¹¹⁵Cs
56	¹²²Ba	¹¹⁵Ba
57	¹²³La
58	¹²⁴Ce
59	¹²⁵Pr
60	¹²⁶Nd
61	¹²⁷Pm
62	¹²⁸Sm