Samarium-143m1

Properties and data of the isotope ¹⁴³Sm.

Content

General data

Name of the isotope:Samarium-143m1; Sm-143m1Symbol:¹⁴³Sm or 14362SmMass number A:143 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:81Isotopic mass:142.914635(3) u (atomic weight of Samarium-143m1)
Excitation energy: 753.99(16) keVNuclide mass:142.8806257 u (calculated nuclear mass without electrons)Mass excess:-79.51699 MeVMass defect:1.27237518 u (per nucleus)Nuclear binding energy:1185.20984592 MeV (per nucleus)
8.28818074 MeV (average binding energy per nucleon)Half-life:66(2) sDecay constant λ:0.010502230008484 s^-1Specific activity α:4.453937215108 × 10⁺¹⁹ Bq g^-1
1203766814.8943 Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-Magnetic dipole moment:μ(μ_N) = + 1.01Nuclear g-factor:g_l = 0.18363636363636

Radioactive Decay

Half-life T_½ = 66(2) s respectively 6.6 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁴³Sm	99.76(5) %
β⁺	¹⁴³Pm	0.24(5) %

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
¹⁴³Sm		8.75(6) min	3/2+
^143m2Sm	2793.8(13) keV	30(3) ms	23/2(-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 81) and isobaric (same nucleon number A = 143) with Samarium-143m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 81	Isobar A = 143
45	¹²⁶Rh
46	¹²⁷Pd
47	¹²⁸Ag
48	¹²⁹Cd
49	¹³⁰In
50	¹³¹Sn
51	¹³²Sb
52	¹³³Te	¹⁴³Te
53	¹³⁴I	¹⁴³I
54	¹³⁵Xe	¹⁴³Xe
55	¹³⁶Cs	¹⁴³Cs
56	¹³⁷Ba	¹⁴³Ba
57	¹³⁸La	¹⁴³La
58	¹³⁹Ce	¹⁴³Ce
59	¹⁴⁰Pr	¹⁴³Pr
60	¹⁴¹Nd	¹⁴³Nd
61	¹⁴²Pm	¹⁴³Pm
62	¹⁴³Sm	¹⁴³Sm
63	¹⁴⁴Eu	¹⁴³Eu
64	¹⁴⁵Gd	¹⁴³Gd
65	¹⁴⁶Tb	¹⁴³Tb
66	¹⁴⁷Dy	¹⁴³Dy
67	¹⁴⁸Ho	¹⁴³Ho
68	¹⁴⁹Er	¹⁴³Er
69	¹⁵⁰Tm
70	¹⁵¹Yb
71	¹⁵²Lu
72	¹⁵³Hf