Ytterbium-157

Properties and data of the isotope ¹⁵⁷Yb.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Ytterbium-157; Yb-157Symbol:¹⁵⁷Yb or 15770YbMass number A:157 (= number of nucleons)Atomic number Z:70 (= number of protons)Neutrons N:87Isotopic mass:156.942649(12) u (atomic weight of Ytterbium-157)Nuclide mass:156.9042519 u (calculated nuclear mass without electrons)Mass excess:-53.42211 MeVMass defect:1.358950932 u (per nucleus)Nuclear binding energy:1265.85463945 MeV (per nucleus)
8.0627684 MeV (average binding energy per nucleon)Separation energy:S_N = 8.227(14) MeV (first neutron)
S_P = 3.876(18) MeV (first proton)Half-life:38.6(10) sDecay constant λ:0.017957180843522 s^-1Specific activity α:6.932094390195 × 10⁺¹⁹ Bq g^-1
1873539024.3771 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μ_N) = - 0.639(8)Nuclear g-factor:g_l = -0.18257142857143Charge radius:5.1324(100) femtometer fmYear of discovery:1970

Radioactive Decay

Half-life T_½ = 38.6(10) s respectively 3.86 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁵⁷Tm	99.5 %	5.29(3) MeV
α	¹⁵³Er	0.5 %	4.622(6) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁶¹Hf, ¹⁵⁷Lu.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 157) with Ytterbium-157. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 87	Isobar A = 157
49	¹³⁶In
50	¹³⁷Sn
51	¹³⁸Sb
52	¹³⁹Te
53	¹⁴⁰I
54	¹⁴¹Xe
55	¹⁴²Cs
56	¹⁴³Ba
57	¹⁴⁴La
58	¹⁴⁵Ce	¹⁵⁷Ce
59	¹⁴⁶Pr	¹⁵⁷Pr
60	¹⁴⁷Nd	¹⁵⁷Nd
61	¹⁴⁸Pm	¹⁵⁷Pm
62	¹⁴⁹Sm	¹⁵⁷Sm
63	¹⁵⁰Eu	¹⁵⁷Eu
64	¹⁵¹Gd	¹⁵⁷Gd
65	¹⁵²Tb	¹⁵⁷Tb
66	¹⁵³Dy	¹⁵⁷Dy
67	¹⁵⁴Ho	¹⁵⁷Ho
68	¹⁵⁵Er	¹⁵⁷Er
69	¹⁵⁶Tm	¹⁵⁷Tm
70	¹⁵⁷Yb	¹⁵⁷Yb
71	¹⁵⁸Lu	¹⁵⁷Lu
72	¹⁵⁹Hf	¹⁵⁷Hf
73	¹⁶⁰Ta	¹⁵⁷Ta
74	¹⁶¹W	¹⁵⁷W
75	¹⁶²Re
76	¹⁶³Os
77	¹⁶⁴Ir