Indium-115m

Properties and data of the isotope ^115mIn.

Contents

General data

Name of the isotope:Indium-115m; In-115mSymbol:^115mIn or 115m49InMass 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-115m)
Excitation energy: 336.244(17) keVNuclide 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)Half-life:4.486(4) hDecay constant λ:4.292039310942 × 10^-5 s^-1Specific activity α:2.267303974287 × 10⁺¹⁷ Bq g^-1
6127848.5791562 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = - 0.24362(5)Nuclear g-factor:g_l = -0.48724

Radioactive Decay

Half-life T_½ = 4.486(4) h (hours) respectively 1.61496 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹⁵Sn	5.0(7) %
Iso	¹¹⁵In	95.0(7) %

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
¹¹⁵In		4.41(25) × 10¹⁴ a	9/2+

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-115m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	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