Hafnium-154

Properties and data of the isotope ¹⁵⁴Hf.

Content

General data

Name of the isotope:Hafnium-154; Hf-154Symbol:¹⁵⁴Hf or 15472HfMass number A:154 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:82Isotopic mass:153.96493(32) u (atomic weight of Hafnium-154)Nuclide mass:153.925436 u (calculated nuclear mass without electrons)Mass excess:-32.66749 MeVMass defect:1.308995416 u (per nucleus)Nuclear binding energy:1219.32137603 MeV (per nucleus)
7.91767127 MeV (average binding energy per nucleon)Separation energy:S_N = 13.44(42) MeV (first neutron)
S_P = 1.59(33) MeV (first proton)Half-life:2(1) sDecay constant λ:0.34657359027997 s^-1Specific activity α:1.364127437254 × 10⁺²¹ Bq g^-1
36868309114.997 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1981

Radioactive Decay

Half-life T_½ = 2(1) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁵⁴Lu	ca. 100 %	7.04(36) MeV
α	¹⁵⁰Yb	ca. 0 %	3.54(42) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵⁸W.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 154) with Hafnium-154. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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