Promethium-160

Properties and data of the isotope ¹⁶⁰Pm.

Content

General data

Name of the isotope:Promethium-160; Pm-160Symbol:¹⁶⁰Pm or 16061PmMass number A:160 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:99Isotopic mass:159.94310(21) u (atomic weight of Promethium-160)Nuclide mass:159.9096392 u (calculated nuclear mass without electrons)Mass excess:-53.00201 MeVMass defect:1.392053636 u (per nucleus)Nuclear binding energy:1296.68960961 MeV (per nucleus)
8.10431006 MeV (average binding energy per nucleon)Separation energy:S_N = 4.52(20) MeV (first neutron)
S_P = 10.48(36) MeV (first proton)Half-life:0.73(6) sDecay constant λ:0.94951668569856 s^-1Specific activity α:3.596303918325 × 10⁺²¹ Bq g^-1
97197403197.976 Ci g^-1Spin and parity:
(nuclear angular momentum)(6-)Year of discovery:2012

Radioactive Decay

Half-life T_½ = 0.73(6) s respectively 7.3 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶⁰Sm	100 %	7.23(20) MeV
β^-, n	¹⁵⁹Sm	?	1.13(20) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 160) with Promethium-160. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 99	Isobar A = 160
57	¹⁵⁶La
58	¹⁵⁷Ce
59	¹⁵⁸Pr	¹⁶⁰Pr
60	¹⁵⁹Nd	¹⁶⁰Nd
61	¹⁶⁰Pm	¹⁶⁰Pm
62	¹⁶¹Sm	¹⁶⁰Sm
63	¹⁶²Eu	¹⁶⁰Eu
64	¹⁶³Gd	¹⁶⁰Gd
65	¹⁶⁴Tb	¹⁶⁰Tb
66	¹⁶⁵Dy	¹⁶⁰Dy
67	¹⁶⁶Ho	¹⁶⁰Ho
68	¹⁶⁷Er	¹⁶⁰Er
69	¹⁶⁸Tm	¹⁶⁰Tm
70	¹⁶⁹Yb	¹⁶⁰Yb
71	¹⁷⁰Lu	¹⁶⁰Lu
72	¹⁷¹Hf	¹⁶⁰Hf
73	¹⁷²Ta	¹⁶⁰Ta
74	¹⁷³W	¹⁶⁰W
75	¹⁷⁴Re	¹⁶⁰Re
76	¹⁷⁵Os
77	¹⁷⁶Ir
78	¹⁷⁷Pt
79	¹⁷⁸Au
80	¹⁷⁹Hg
81	¹⁸⁰Tl
82	¹⁸¹Pb