Samarium-143m2

Properties and data of the isotope ^143m2Sm.

Contents

General data

Name of the isotope:Samarium-143m2; Sm-143m2Symbol:^143m2Sm or 143m262SmMass 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-143m2)
Excitation energy: 2793.8(13) 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:30(3) msDecay constant λ:23.104906018665 s^-1Specific activity α:9.798661873239 × 10⁺²² Bq g^-1
2648286992767.4 Ci g^-1Spin and parity:
(nuclear angular momentum)23/2(-)

Radioactive Decay

Half-life T_½ = 30(3) ms respectively 3.0 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁴³Sm	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
¹⁴³Sm		8.75(6) min	3/2+
^143m1Sm	753.99(16) keV	66(2) s	11/2-

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-143m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	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