Tantalum-161

Properties and data of the isotope ¹⁶¹Ta.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Tantalum-161; Ta-161Symbol:¹⁶¹Ta or 16173TaMass number A:161 (= number of nucleons)Atomic number Z:73 (= number of protons)Neutrons N:88Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.2054794520548 (= neutron-proton ratio)Neutron excess (N-Z):15Isotopic mass:160.958369(26) u (atomic weight of Tantalum-161)Nuclide mass:160.9183266 u (calculated nuclear mass without electrons)Mass excess:-38.77903 MeVMass defect:1.375370944 u (per nucleus)Nuclear binding energy:1281.14978211 MeV (per nucleus)
7.95745206 MeV (average binding energy per nucleon)Separation energy:S_N = 11.03(6) MeV (first neutron)
S_P = 0.129(23) MeV (first proton)Half-life:Spin and parity:
(nuclear angular momentum)(1/2+)Year of discovery:1979

Radioactive Decay

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁵⁷Lu	?
EC/β⁺	¹⁶¹Hf	?

Parent Nuclides

Direct parent isotope is: ¹⁶⁵Re.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 161) with Tantalum-161. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 88	Isobar A = 161
49	¹³⁷In
50	¹³⁸Sn
51	¹³⁹Sb
52	¹⁴⁰Te
53	¹⁴¹I
54	¹⁴²Xe
55	¹⁴³Cs
56	¹⁴⁴Ba
57	¹⁴⁵La
58	¹⁴⁶Ce
59	¹⁴⁷Pr
60	¹⁴⁸Nd	¹⁶¹Nd
61	¹⁴⁹Pm	¹⁶¹Pm
62	¹⁵⁰Sm	¹⁶¹Sm
63	¹⁵¹Eu	¹⁶¹Eu
64	¹⁵²Gd	¹⁶¹Gd
65	¹⁵³Tb	¹⁶¹Tb
66	¹⁵⁴Dy	¹⁶¹Dy
67	¹⁵⁵Ho	¹⁶¹Ho
68	¹⁵⁶Er	¹⁶¹Er
69	¹⁵⁷Tm	¹⁶¹Tm
70	¹⁵⁸Yb	¹⁶¹Yb
71	¹⁵⁹Lu	¹⁶¹Lu
72	¹⁶⁰Hf	¹⁶¹Hf
73	¹⁶¹Ta	¹⁶¹Ta
74	¹⁶²W	¹⁶¹W
75	¹⁶³Re	¹⁶¹Re
76	¹⁶⁴Os	¹⁶¹Os
77	¹⁶⁵Ir
78	¹⁶⁶Pt