Indium-120m2

Properties and data of the isotope ¹²⁰In.

Content

General data

Name of the isotope:Indium-120m2; In-120m2Symbol:¹²⁰In or 12049InMass number A:120 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:71Isotopic mass:119.90797(4) u (atomic weight of Indium-120m2)
Excitation energy: 70(60) keVNuclide mass:119.8810911 u (calculated nuclear mass without electrons)Mass excess:-85.72539 MeVMass defect:1.090665604 u (per nucleus)Nuclear binding energy:1015.94846613 MeV (per nucleus)
8.46623722 MeV (average binding energy per nucleon)Half-life:46.2(8) sDecay constant λ:0.015003185726406 s^-1Specific activity α:7.592546032958 × 10⁺¹⁹ Bq g^-1
2052039468.3672 Ci g^-1Spin and parity:
(nuclear angular momentum)(5)+Magnetic dipole moment:μ(μ_N) = +4.289(5)Nuclear g-factor:g_l = 0.8578

Radioactive Decay

Half-life T_½ = 46.2(8) s respectively 4.62 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²⁰Sn	100 %

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
¹²⁰In		3.08(8) s	1+
^120m1In	+x keV	47.3(5) s	(8-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 71) and isobaric (same nucleon number A = 120) with Indium-120m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 71	Isobar A = 120
40	¹¹¹Zr
41	¹¹²Nb
42	¹¹³Mo
43	¹¹⁴Tc	¹²⁰Tc
44	¹¹⁵Ru	¹²⁰Ru
45	¹¹⁶Rh	¹²⁰Rh
46	¹¹⁷Pd	¹²⁰Pd
47	¹¹⁸Ag	¹²⁰Ag
48	¹¹⁹Cd	¹²⁰Cd
49	¹²⁰In	¹²⁰In
50	¹²¹Sn	¹²⁰Sn
51	¹²²Sb	¹²⁰Sb
52	¹²³Te	¹²⁰Te
53	¹²⁴I	¹²⁰I
54	¹²⁵Xe	¹²⁰Xe
55	¹²⁶Cs	¹²⁰Cs
56	¹²⁷Ba	¹²⁰Ba
57	¹²⁸La	¹²⁰La
58	¹²⁹Ce	¹²⁰Ce
59	¹³⁰Pr
60	¹³¹Nd
61	¹³²Pm
62	¹³³Sm
63	¹³⁴Eu
64	¹³⁵Gd
65	¹³⁶Tb