Cerium-133

Properties and data of the isotope ¹³³Ce.

Content

General data

Name of the isotope:Cerium-133; Ce-133Symbol:¹³³Ce or 13358CeMass number A:133 (= number of nucleons)Atomic number Z:58 (= number of protons)Neutrons N:75Isotopic mass:132.911520(18) u (atomic weight of Cerium-133)Nuclide mass:132.8797046 u (calculated nuclear mass without electrons)Mass excess:-82.41859 MeVMass defect:1.192200556 u (per nucleus)Nuclear binding energy:1110.52766471 MeV (per nucleus)
8.34983207 MeV (average binding energy per nucleon)Separation energy:S_N = 8.019(26) MeV (first neutron)
S_P = 5.98(4) MeV (first proton)Half-life:97(4) minDecay constant λ:0.00011909745370446 s^-1Specific activity α:5.433497289909 × 10⁺¹⁷ Bq g^-1
14685127.810566 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Year of discovery:1951

Radioactive Decay

Half-life T_½ = 97(4) min (minutes) respectively 5.820 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹³³La	100 %	2.9 MeV

Parent Nuclides

Direct parent isotope is: ¹³³Pr.

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
^133mCe	37.2(7) keV	5.1(3) h	9/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 133) with Cerium-133. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 75	Isobar A = 133
42	¹¹⁷Mo
43	¹¹⁸Tc
44	¹¹⁹Ru
45	¹²⁰Rh
46	¹²¹Pd
47	¹²²Ag
48	¹²³Cd	¹³³Cd
49	¹²⁴In	¹³³In
50	¹²⁵Sn	¹³³Sn
51	¹²⁶Sb	¹³³Sb
52	¹²⁷Te	¹³³Te
53	¹²⁸I	¹³³I
54	¹²⁹Xe	¹³³Xe
55	¹³⁰Cs	¹³³Cs
56	¹³¹Ba	¹³³Ba
57	¹³²La	¹³³La
58	¹³³Ce	¹³³Ce
59	¹³⁴Pr	¹³³Pr
60	¹³⁵Nd	¹³³Nd
61	¹³⁶Pm	¹³³Pm
62	¹³⁷Sm	¹³³Sm
63	¹³⁸Eu	¹³³Eu
64	¹³⁹Gd
65	¹⁴⁰Tb
66	¹⁴¹Dy
67	¹⁴²Ho
68	¹⁴³Er
69	¹⁴⁴Tm