Terbium-148m

Properties and data of the isotope ¹⁴⁸Tb.

Content

General data

Name of the isotope:Terbium-148m; Tb-148mSymbol:¹⁴⁸Tb or 14865TbMass number A:148 (= number of nucleons)Atomic number Z:65 (= number of protons)Neutrons N:83Isotopic mass:147.924275(13) u (atomic weight of Terbium-148m)
Excitation energy: 90.1(3) keVNuclide mass:147.8886203 u (calculated nuclear mass without electrons)Mass excess:-70.53738 MeVMass defect:1.303540108 u (per nucleus)Nuclear binding energy:1214.23978936 MeV (per nucleus)
8.2043229 MeV (average binding energy per nucleon)Half-life:2.20(5) minDecay constant λ:0.005251115004242 s^-1Specific activity α:2.151221376004 × 10⁺¹⁹ Bq g^-1
581411182.70403 Ci g^-1Spin and parity:
(nuclear angular momentum)(9)+

Radioactive Decay

Half-life T_½ = 2.20(5) min (minutes) respectively 1.32 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴⁸Gd	100 %

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
¹⁴⁸Tb		60(1) min	2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 148) with Terbium-148m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 83	Isobar A = 148
46	¹²⁹Pd
47	¹³⁰Ag
48	¹³¹Cd
49	¹³²In
50	¹³³Sn
51	¹³⁴Sb
52	¹³⁵Te
53	¹³⁶I
54	¹³⁷Xe	¹⁴⁸Xe
55	¹³⁸Cs	¹⁴⁸Cs
56	¹³⁹Ba	¹⁴⁸Ba
57	¹⁴⁰La	¹⁴⁸La
58	¹⁴¹Ce	¹⁴⁸Ce
59	¹⁴²Pr	¹⁴⁸Pr
60	¹⁴³Nd	¹⁴⁸Nd
61	¹⁴⁴Pm	¹⁴⁸Pm
62	¹⁴⁵Sm	¹⁴⁸Sm
63	¹⁴⁶Eu	¹⁴⁸Eu
64	¹⁴⁷Gd	¹⁴⁸Gd
65	¹⁴⁸Tb	¹⁴⁸Tb
66	¹⁴⁹Dy	¹⁴⁸Dy
67	¹⁵⁰Ho	¹⁴⁸Ho
68	¹⁵¹Er	¹⁴⁸Er
69	¹⁵²Tm	¹⁴⁸Tm
70	¹⁵³Yb	¹⁴⁸Yb
71	¹⁵⁴Lu
72	¹⁵⁵Hf
73	¹⁵⁶Ta
74	¹⁵⁷W