Barium-132

Properties and data of the isotope ¹³²Ba.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

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

General data

Name of the isotope:Barium-132; Ba-132Symbol:¹³²Ba or 13256BaMass number A:132 (= number of nucleons)Atomic number Z:56 (= number of protons)Neutrons N:76Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3571428571429 (= neutron-proton ratio)Neutron excess (N-Z):20Isotopic mass:131.9050611(11) u (atomic weight of Barium-132)Nuclide mass:131.8743427 u (calculated nuclear mass without electrons)Mass excess:-88.43502 MeVMass defect:1.191674308 u (per nucleus)Nuclear binding energy:1110.03746786 MeV (per nucleus)
8.40937476 MeV (average binding energy per nucleon)Separation energy:S_N = 9.8226(27) MeV (first neutron)
S_P = 7.665(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.8303(47) femtometer fmYear of discovery:1936

Radioactive Decay

Half-life T_½ = stable.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
2 β⁺	¹³²Xe

Parent Nuclides

Direct parent isotopes are: ¹³²La, ¹³²Cs.

Occurrence

Comparison of the natural Barium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Barium Isotopic mixture	137.327 u	100 %
Isotope ¹³⁰Ba	129.90632(2) u	0.11(1) %	1.6 × 10²¹ a	0+
Isotope ¹³²Ba	131.9050611(11) u	0.10(1) %	stable	0+
Isotope ¹³⁴Ba	133.904508(2) u	2.42(15) %	stable	0+
Isotope ¹³⁵Ba	134.905688(2) u	6.59(10) %	stable	3/2+
Isotope ¹³⁶Ba	135.904576(2) u	7.85(24) %	stable	0+
Isotope ¹³⁷Ba	136.905827(2) u	11.23(23) %	stable	3/2+
Isotope ¹³⁸Ba	137.905247(2) u	71.70(29) %	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 76) and isobaric (same nucleon number A = 132) with Barium-132. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 76	Isobar A = 132
42	¹¹⁸Mo
43	¹¹⁹Tc
44	¹²⁰Ru
45	¹²¹Rh
46	¹²²Pd
47	¹²³Ag	¹³²Ag
48	¹²⁴Cd	¹³²Cd
49	¹²⁵In	¹³²In
50	¹²⁶Sn	¹³²Sn
51	¹²⁷Sb	¹³²Sb
52	¹²⁸Te	¹³²Te
53	¹²⁹I	¹³²I
54	¹³⁰Xe	¹³²Xe
55	¹³¹Cs	¹³²Cs
56	¹³²Ba	¹³²Ba
57	¹³³La	¹³²La
58	¹³⁴Ce	¹³²Ce
59	¹³⁵Pr	¹³²Pr
60	¹³⁶Nd	¹³²Nd
61	¹³⁷Pm	¹³²Pm
62	¹³⁸Sm	¹³²Sm
63	¹³⁹Eu	¹³²Eu
64	¹⁴⁰Gd
65	¹⁴¹Tb
66	¹⁴²Dy
67	¹⁴³Ho
68	¹⁴⁴Er
69	¹⁴⁵Tm

External data and identifiers

Adopted Levels, Gammas:NuDat 132Ba

Literature and References

[1] - A. P. Meshik, C. M. Hohenberg, O. V. Pravdivtseva, Ya. S. Kapusta:
Weak decay of ¹³⁰Ba and ¹³²Ba: Geochemical measurements.
In: Physical Review C, (2001), DOI 10.1103/PhysRevC.64.035205.