Praseodymium-140m2

Properties and data of the isotope ¹⁴⁰Pr.

Content

See also: list of Praseodymium isotopes.

General data

Name of the isotope:Praseodymium-140m2; Pr-140m2Symbol:¹⁴⁰Pr or 14059PrMass number A:140 (= number of nucleons)Atomic number Z:59 (= number of protons)Neutrons N:81Isotopic mass:139.909084(7) u (atomic weight of Praseodymium-140m2)
Excitation energy: 763.7(5) keVNuclide mass:139.8767202 u (calculated nuclear mass without electrons)Mass excess:-84.68771 MeVMass defect:1.254451084 u (per nucleus)Nuclear binding energy:1168.51365804 MeV (per nucleus)
8.34652613 MeV (average binding energy per nucleon)Half-life:3.05(20) µsDecay constant λ:227261.37067539 s^-1Specific activity α:9.846043066399 × 10⁺²⁶ Bq g^-1
2.661092720648 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)(7)-

Radioactive Decay

Half-life T_½ = 3.05(20) µs respectively 3.05 × 10^-6 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁴⁰Pr	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
¹⁴⁰Pr		3.39(1) min	1+
^140m1Pr	127.8(3) keV	0.35(2) μs	5+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 81) and isobaric (same nucleon number A = 140) with Praseodymium-140m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 81	Isobar A = 140
45	¹²⁶Rh
46	¹²⁷Pd
47	¹²⁸Ag
48	¹²⁹Cd
49	¹³⁰In
50	¹³¹Sn
51	¹³²Sb	¹⁴⁰Sb
52	¹³³Te	¹⁴⁰Te
53	¹³⁴I	¹⁴⁰I
54	¹³⁵Xe	¹⁴⁰Xe
55	¹³⁶Cs	¹⁴⁰Cs
56	¹³⁷Ba	¹⁴⁰Ba
57	¹³⁸La	¹⁴⁰La
58	¹³⁹Ce	¹⁴⁰Ce
59	¹⁴⁰Pr	¹⁴⁰Pr
60	¹⁴¹Nd	¹⁴⁰Nd
61	¹⁴²Pm	¹⁴⁰Pm
62	¹⁴³Sm	¹⁴⁰Sm
63	¹⁴⁴Eu	¹⁴⁰Eu
64	¹⁴⁵Gd	¹⁴⁰Gd
65	¹⁴⁶Tb	¹⁴⁰Tb
66	¹⁴⁷Dy	¹⁴⁰Dy
67	¹⁴⁸Ho	¹⁴⁰Ho
68	¹⁴⁹Er
69	¹⁵⁰Tm
70	¹⁵¹Yb
71	¹⁵²Lu
72	¹⁵³Hf