Samarium-141

Properties and data of the isotope ¹⁴¹Sm.

Content

General data

Name of the isotope:Samarium-141; Sm-141Symbol:¹⁴¹Sm or 14162SmMass number A:141 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:79Isotopic mass:140.918482(9) u (atomic weight of Samarium-141)Nuclide mass:140.8844727 u (calculated nuclear mass without electrons)Mass excess:-75.93353 MeVMass defect:1.251198348 u (per nucleus)Nuclear binding energy:1165.48375397 MeV (per nucleus)
8.26584223 MeV (average binding energy per nucleon)Separation energy:S_N = 8.549(15) MeV (first neutron)
S_P = 5.009(26) MeV (first proton)Half-life:10.2(2) minDecay constant λ:0.0011325934322875 s^-1Specific activity α:4.871883704481 × 10⁺¹⁸ Bq g^-1
131672532.55356 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Magnetic dipole moment:μ(μ_N) = -0.74(2)Nuclear g-factor:g_l = -1.48Charge radius:4.9517(34) femtometer fmYear of discovery:1967

Radioactive Decay

Half-life T_½ = 10.2(2) min (minutes) respectively 6.12 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴¹Pm	100 %	4.589(16) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴¹Eu.

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
^141mSm	175.9(3) keV	22.6(2) min	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 141) with Samarium-141. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 79	Isobar A = 141
44	¹²³Ru
45	¹²⁴Rh
46	¹²⁵Pd
47	¹²⁶Ag
48	¹²⁷Cd
49	¹²⁸In
50	¹²⁹Sn
51	¹³⁰Sb	¹⁴¹Sb
52	¹³¹Te	¹⁴¹Te
53	¹³²I	¹⁴¹I
54	¹³³Xe	¹⁴¹Xe
55	¹³⁴Cs	¹⁴¹Cs
56	¹³⁵Ba	¹⁴¹Ba
57	¹³⁶La	¹⁴¹La
58	¹³⁷Ce	¹⁴¹Ce
59	¹³⁸Pr	¹⁴¹Pr
60	¹³⁹Nd	¹⁴¹Nd
61	¹⁴⁰Pm	¹⁴¹Pm
62	¹⁴¹Sm	¹⁴¹Sm
63	¹⁴²Eu	¹⁴¹Eu
64	¹⁴³Gd	¹⁴¹Gd
65	¹⁴⁴Tb	¹⁴¹Tb
66	¹⁴⁵Dy	¹⁴¹Dy
67	¹⁴⁶Ho	¹⁴¹Ho
68	¹⁴⁷Er
69	¹⁴⁸Tm
70	¹⁴⁹Yb
71	¹⁵⁰Lu