Samarium-144m

Properties and data of the isotope ¹⁴⁴Sm.

Content

General data

Name of the isotope:Samarium-144m; Sm-144mSymbol:¹⁴⁴Sm or 14462SmMass number A:144 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:82Isotopic mass:143.91201(2) u (atomic weight of Samarium-144m)
Excitation energy: 2323.60(8) keVNuclide mass:143.8780007 u (calculated nuclear mass without electrons)Mass excess:-81.96216 MeVMass defect:1.283665096 u (per nucleus)Nuclear binding energy:1195.72633493 MeV (per nucleus)
8.3036551 MeV (average binding energy per nucleon)Half-life:880(25) nsDecay constant λ:787667.2506363 s^-1Specific activity α:3.317093100762 × 10⁺²⁷ Bq g^-1
8.965116488548 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)6+

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
¹⁴⁴Sm		stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 144) with Samarium-144m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 82	Isobar A = 144
45	¹²⁷Rh
46	¹²⁸Pd
47	¹²⁹Ag
48	¹³⁰Cd
49	¹³¹In
50	¹³²Sn
51	¹³³Sb
52	¹³⁴Te
53	¹³⁵I	¹⁴⁴I
54	¹³⁶Xe	¹⁴⁴Xe
55	¹³⁷Cs	¹⁴⁴Cs
56	¹³⁸Ba	¹⁴⁴Ba
57	¹³⁹La	¹⁴⁴La
58	¹⁴⁰Ce	¹⁴⁴Ce
59	¹⁴¹Pr	¹⁴⁴Pr
60	¹⁴²Nd	¹⁴⁴Nd
61	¹⁴³Pm	¹⁴⁴Pm
62	¹⁴⁴Sm	¹⁴⁴Sm
63	¹⁴⁵Eu	¹⁴⁴Eu
64	¹⁴⁶Gd	¹⁴⁴Gd
65	¹⁴⁷Tb	¹⁴⁴Tb
66	¹⁴⁸Dy	¹⁴⁴Dy
67	¹⁴⁹Ho	¹⁴⁴Ho
68	¹⁵⁰Er	¹⁴⁴Er
69	¹⁵¹Tm	¹⁴⁴Tm
70	¹⁵²Yb
71	¹⁵³Lu
72	¹⁵⁴Hf
73	¹⁵⁵Ta