Barium-136

Properties and data of the isotope ¹³⁶Ba.

Contents

General data

Name of the isotope:Barium-136; Ba-136Symbol:¹³⁶Ba or 13656BaMass number A:136 (= number of nucleons)Atomic number Z:56 (= number of protons)Neutrons N:80Isotopic mass:135.904576(2) u (atomic weight of Barium-136)Nuclide mass:135.8738576 u (calculated nuclear mass without electrons)Mass excess:-88.88688 MeVMass defect:1.226819072 u (per nucleus)Nuclear binding energy:1142.77460465 MeV (per nucleus)
8.40275445 MeV (average binding energy per nucleon)Separation energy:S_N = 9.10774(4) MeV (first neutron)
S_P = 9.5942(10) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.8334(46) femtometer fmYear of discovery:1932

Parent Nuclides

Direct parent isotopes are: ¹³⁶La, ¹³⁶Cs, ¹³⁶Xe, ¹³⁶Ce.

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+

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
^136mBa	2030.535(18) keV	308.4(19) ms	7-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 136) with Barium-136. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 80	Isobar A = 136
44	¹²⁴Ru
45	¹²⁵Rh
46	¹²⁶Pd
47	¹²⁷Ag
48	¹²⁸Cd
49	¹²⁹In	¹³⁶In
50	¹³⁰Sn	¹³⁶Sn
51	¹³¹Sb	¹³⁶Sb
52	¹³²Te	¹³⁶Te
53	¹³³I	¹³⁶I
54	¹³⁴Xe	¹³⁶Xe
55	¹³⁵Cs	¹³⁶Cs
56	¹³⁶Ba	¹³⁶Ba
57	¹³⁷La	¹³⁶La
58	¹³⁸Ce	¹³⁶Ce
59	¹³⁹Pr	¹³⁶Pr
60	¹⁴⁰Nd	¹³⁶Nd
61	¹⁴¹Pm	¹³⁶Pm
62	¹⁴²Sm	¹³⁶Sm
63	¹⁴³Eu	¹³⁶Eu
64	¹⁴⁴Gd	¹³⁶Gd
65	¹⁴⁵Tb	¹³⁶Tb
66	¹⁴⁶Dy
67	¹⁴⁷Ho
68	¹⁴⁸Er
69	¹⁴⁹Tm
70	¹⁵⁰Yb
71	¹⁵¹Lu