Ytterbium-149

Properties and data of the isotope ¹⁴⁹Yb.

Content

General data

Name of the isotope:Ytterbium-149; Yb-149Symbol:¹⁴⁹Yb or 14970YbMass number A:149 (= number of nucleons)Atomic number Z:70 (= number of protons)Neutrons N:79Isotopic mass:148.96436(32) u (atomic weight of Ytterbium-149)Nuclide mass:148.9259629 u (calculated nuclear mass without electrons)Mass excess:-33.19845 MeVMass defect:1.267920604 u (per nucleus)Nuclear binding energy:1181.0604351 MeV (per nucleus)
7.9265801 MeV (average binding energy per nucleon)Separation energy:S_N = 10.94(50) MeV (first neutron)
S_P = 1.72(30) MeV (first proton)Half-life:0.7(2) sDecay constant λ:0.99021025794278 s^-1Specific activity α:4.02917949613 × 10⁺²¹ Bq g^-1
108896743138.89 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+.3/2+)Year of discovery:2001

Radioactive Decay

Half-life T_½ = 0.7(2) s respectively 7 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴⁹Tm	100 %	10.68(36) MeV
EE, p	¹⁴⁸Er	?

Parent Nuclides

Direct parent isotope is: ¹⁵⁰Lu.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 149) with Ytterbium-149. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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