Samarium-152

Properties and data of the isotope ¹⁵²Sm.

Contents

See also: List of individual Samarium isotopes (and general data sources).

General data

Name of the isotope:Samarium-152; Sm-152Symbol:¹⁵²Sm or 15262SmMass number A:152 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:90Isotopic mass:151.91974(2) u (atomic weight of Samarium-152)Nuclide mass:151.8857307 u (calculated nuclear mass without electrons)Mass excess:-74.76171 MeVMass defect:1.345254424 u (per nucleus)Nuclear binding energy:1253.09642443 MeV (per nucleus)
8.24405542 MeV (average binding energy per nucleon)Separation energy:S_N = 8.2576(6) MeV (first neutron)
S_P = 8.666(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.0819(60) femtometer fmYear of discovery:1933

Parent Nuclides

Direct parent isotopes are: ¹⁵²Pm, ¹⁵²Eu.

Occurrence

Comparison of the natural Samarium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Samarium Isotopic mixture	150.36 u	100 %
Isotope ¹⁴⁴Sm	143.91201(2) u	3.08(4) %	stable	0+
Isotope ¹⁴⁸Sm	147.91483(2) u	11.25(9) %	7(3)×10¹⁵ a	0+
Isotope ¹⁴⁹Sm	148.91719(2) u	13.82(10) %	stable	7/2-
Isotope ¹⁵⁰Sm	149.91728(2) u	7.37(9) %	stable	0+
Isotope ¹⁵²Sm	151.91974(2) u	26.74(9) %	stable	0+
Isotope ¹⁵⁴Sm	153.92222(2) u	22.74(14) %	stable	0+
Isotope ¹⁴⁷Sm	146.91490(2) u	15.00(14) %	1.0625(38) × 10¹¹ a	7/2-
Isotope ¹⁴⁶Sm	145.913047(3) u	[trace]	9.20 (26) × 10⁷ a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 90) and isobaric (same nucleon number A = 152) with Samarium-152. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 90	Isobar A = 152
50	¹⁴⁰Sn
51	¹⁴¹Sb
52	¹⁴²Te
53	¹⁴³I
54	¹⁴⁴Xe
55	¹⁴⁵Cs
56	¹⁴⁶Ba	¹⁵²Ba
57	¹⁴⁷La	¹⁵²La
58	¹⁴⁸Ce	¹⁵²Ce
59	¹⁴⁹Pr	¹⁵²Pr
60	¹⁵⁰Nd	¹⁵²Nd
61	¹⁵¹Pm	¹⁵²Pm
62	¹⁵²Sm	¹⁵²Sm
63	¹⁵³Eu	¹⁵²Eu
64	¹⁵⁴Gd	¹⁵²Gd
65	¹⁵⁵Tb	¹⁵²Tb
66	¹⁵⁶Dy	¹⁵²Dy
67	¹⁵⁷Ho	¹⁵²Ho
68	¹⁵⁸Er	¹⁵²Er
69	¹⁵⁹Tm	¹⁵²Tm
70	¹⁶⁰Yb	¹⁵²Yb
71	¹⁶¹Lu	¹⁵²Lu
72	¹⁶²Hf
73	¹⁶³Ta
74	¹⁶⁴W
75	¹⁶⁵Re
76	¹⁶⁶Os
77	¹⁶⁷Ir
78	¹⁶⁸Pt