Promethium-132

Properties and data of the isotope ¹³²Pm.

Content

General data

Name of the isotope:Promethium-132; Pm-132Symbol:¹³²Pm or 13261PmMass number A:132 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:71Isotopic mass:131.93384(16) u (atomic weight of Promethium-132)Nuclide mass:131.9003792 u (calculated nuclear mass without electrons)Mass excess:-61.62764 MeVMass defect:1.158695988 u (per nucleus)Nuclear binding energy:1079.31836065 MeV (per nucleus)
8.17665425 MeV (average binding energy per nucleon)Separation energy:S_N = 10.04(25) MeV (first neutron)
S_P = 1.15(15) MeV (first proton)Half-life:6.2(6) sDecay constant λ:0.11179793234838 s^-1Specific activity α:5.139411423294 × 10⁺²⁰ Bq g^-1
13890301144.04 Ci g^-1Spin and parity:
(nuclear angular momentum)(3+)Year of discovery:1977

Radioactive Decay

Half-life T_½ = 6.2(6) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹³²Nd	100 %	9.80(15) MeV
EE, p	¹³¹Pr	0.00005 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 71) and isobaric (same nucleon number A = 132) with Promethium-132. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 71	Isobar A = 132
40	¹¹¹Zr
41	¹¹²Nb
42	¹¹³Mo
43	¹¹⁴Tc
44	¹¹⁵Ru
45	¹¹⁶Rh
46	¹¹⁷Pd
47	¹¹⁸Ag	¹³²Ag
48	¹¹⁹Cd	¹³²Cd
49	¹²⁰In	¹³²In
50	¹²¹Sn	¹³²Sn
51	¹²²Sb	¹³²Sb
52	¹²³Te	¹³²Te
53	¹²⁴I	¹³²I
54	¹²⁵Xe	¹³²Xe
55	¹²⁶Cs	¹³²Cs
56	¹²⁷Ba	¹³²Ba
57	¹²⁸La	¹³²La
58	¹²⁹Ce	¹³²Ce
59	¹³⁰Pr	¹³²Pr
60	¹³¹Nd	¹³²Nd
61	¹³²Pm	¹³²Pm
62	¹³³Sm	¹³²Sm
63	¹³⁴Eu	¹³²Eu
64	¹³⁵Gd
65	¹³⁶Tb