Barium-135

Properties and data of the isotope ¹³⁵Ba.

Contents

General Data

Parent Nuclides

NMR Data

Isotones und Isobares

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

General data

Name of the isotope:Barium-135; Ba-135Symbol:¹³⁵Ba or 13556BaMass number A:135 (= number of nucleons)Atomic number Z:56 (= number of protons)Neutrons N:79Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4107142857143 (= neutron-proton ratio)Neutron excess (N-Z):23Isotopic mass:134.905688(2) u (atomic weight of Barium-135)Nuclide mass:134.8749696 u (calculated nuclear mass without electrons)Mass excess:-87.85106 MeVMass defect:1.217042156 u (per nucleus)Nuclear binding energy:1133.66746606 MeV (per nucleus)
8.39753679 MeV (average binding energy per nucleon)Separation energy:S_N = 6.97196(10) MeV (first neutron)
S_P = 8.2483(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = +0.8381(2)Charge radius:4.8294(47) femtometer fmYear of discovery:1932

Parent Nuclides

Direct parent isotopes are: ¹³⁵La, ¹³⁵Cs.

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+

NMR data

Nuclear magnetic properties and parameters of the NMR active Nuclide ¹³⁵Ba

Isotope:¹³⁵Ba-NMRQuantity:6.59(10) %Spin:3/2+Nuclearmagnetic moment
μ/μ_N:+0.8381(2)Gyromagnetic ratio γ:2.6755 · 10⁷ rad T^-1 s^-1
4.25819 MHz T^-1Nuclear g-factor:g_l = 0.55873333333333Quadrupole moment Q:+ 0.153(2) barn (100 fm²)Resonance frequency:v₀ = 4.2617 MHz at 1 TRelative Sensitivity:[related to ¹H = 1.000]:
0.00501 (H₀ = const.)
0.5005 (v₀ = const.)

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
^135mBa	268.218(20) keV	28.7(2) h	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 135) with Barium-135. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 79	Isobar A = 135
44	¹²³Ru
45	¹²⁴Rh
46	¹²⁵Pd
47	¹²⁶Ag
48	¹²⁷Cd
49	¹²⁸In	¹³⁵In
50	¹²⁹Sn	¹³⁵Sn
51	¹³⁰Sb	¹³⁵Sb
52	¹³¹Te	¹³⁵Te
53	¹³²I	¹³⁵I
54	¹³³Xe	¹³⁵Xe
55	¹³⁴Cs	¹³⁵Cs
56	¹³⁵Ba	¹³⁵Ba
57	¹³⁶La	¹³⁵La
58	¹³⁷Ce	¹³⁵Ce
59	¹³⁸Pr	¹³⁵Pr
60	¹³⁹Nd	¹³⁵Nd
61	¹⁴⁰Pm	¹³⁵Pm
62	¹⁴¹Sm	¹³⁵Sm
63	¹⁴²Eu	¹³⁵Eu
64	¹⁴³Gd	¹³⁵Gd
65	¹⁴⁴Tb	¹³⁵Tb
66	¹⁴⁵Dy
67	¹⁴⁶Ho
68	¹⁴⁷Er
69	¹⁴⁸Tm
70	¹⁴⁹Yb
71	¹⁵⁰Lu