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Isotopes of Boron

List, data and properties of all known isotopes of Boron as well as radioactive decay products and intermediate products.

 

Boron isotopes

There are 14 known isotopes of the chemical element boron, of which the nuclides 10B and 11B are stable.< /p>

The atomic mass of boron is given as an average of 10.81 u, or with an interval of 10.806 to 10.821 u.

 

Naturally Occurring Boron Isotopes

Boron occurs in nature in an average ratio of about 20 to 80:

Atomic Mass maQuantityHalf-lifeSpin
Boron
Isotopic mixture
10,81 u100 %
Isotope 10B10,012937(3) u19,65 %stable3+
Isotope 11B11,009305(3) u80,35 %stable3/2-

 

 

Boron-10

Bor-10 is a neutron scavenger with a neutron capture cross-section that is 8 x 105 higher than that of boron-11: After neutron capture, the 10B(n,α ) to 7Li and 4He and thus binds the neutron, which is then no longer available in a chain reaction in nuclear reactors, for example (moderator).

The so-called 10boron neutron capture therapy (BNCT) against cancer works according to the same principle: After the application of certain boron compounds into a tumor, it is irradiated with thermal neutrons. The released Li and He nuclei have a range of only a few micrometers and destroy the surrounding tumor tissue.

 

Isotope Table: Boron

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
6B561Boron-66.0508 u
[6.0480571 u]
{47.3199 MeV}
7B572Boron-77.029712(27) u
[7.0269691 u]
{27.67655 MeV}
(3/2-)
8B583Boron-88.0246073(11) u
[8.0218644 u]
{22.92155 MeV}
2+1.0355(3)
9B594Boron-99.0133296(10) u
[9.0105867 u]
{12.41644 MeV}
3/2-9C
10B5105Boron-1010.012937(3) u
[10.0101941 u]
{12.05074 MeV}
3+1.8004636(8)10Be
10C
11B5116Boron-1111.009305(3) u
[11.0065621 u]
{8.66755 MeV}
3/2-2.688378(1)11Be
11C
12B5127Boron-1212.0143526(14) u
[12.0116097 u]
{13.36936 MeV}
1++1.003(1)12Be
13B5138Boron-1313.0177800(11) u
[13.0150371 u]
{16.56196 MeV}
3/2-+3.1778(5)
14B5149Boron-1414.025404(23) u
[14.0226611 u]
{23.66367 MeV}
2-+1.185(5)
15B51510Boron-1515.031088(23) u
[15.0283451 u]
{28.95829 MeV}
3/2-+2.659(15)
16B51611Boron-1616.039842(26) u
[16.0370991 u]
{37.11258 MeV}
0-
17B51712Boron-1717.04693(22) u
[17.0441871 u]
{43.71501 MeV}
(3/2-)+2.55(2)
18B51813Boron-1818.05560(22) u
[18.0528571 u]
{51.79107 MeV}
(2-)
19B51914Boron-1919.06417(56) u
[19.0614271 u]
{59.77397 MeV}
3/2-
20B52015Boron-2020.07348(86) u
[20.0707371 u]
{68.44618 MeV}
(1-, 2-)
21B52116Boron-2121.08302(97) u
[21.0802771 u]
{77.33263 MeV}
(3/2-)

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
B-62p ? AL
B-7570(14) × 10-24 sp 6Be11.9 MeVAL
B-8770(3) msβ+ EC
β+, α 4He


AL
B-9800(300) × 10-21 sp → 8Be100 %AL
B-10stableAL
B-11stableAL
B-1220.20(2) msβ-12C
β-, α → 8Be
99.4 %
0.60(2) %
13.3694(13) MeV
AL
B-1317.33(17) msβ-13C
β-, n → 12C
99.72 %
0.286 %
13.4369(10) MeV
AL
B-1412.5(5) msβ-14C
β-, n → 13C
93.9 %
6.1(3) %
20.644(21) MeV
AL
B-159.93(7) msβ-15C
β-, n → 14C
β-, 2n → 13C
6 %
93.6 %
0.4 %
19.085(21) MeV

AL
B-16> 4.6 × 10-21 sn 15B100 %AL
B-175.08(5) msβ-17C
β-, n → 16C
β-, 2n → 15C
β-, 3n → 14C
β-, 4n → 13C
22.1 %
63.0 %
11.0 %
3.5 %
0.40 %




AL
B-18< 26 nsn → 17BAL
B-192.92(13) msβ-, n → 18C
β-, 2n → 17C
β-19C
71 %
17 %
12 %


AL
B-20< 260 nsn → 19BAL
B-21< 260 ns2n → 19BAL

 

Notes (related to the columns):

1 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Boron isotope.
6 - Relative atomic mass of the Boron isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - Source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.
10 - Decay: Half-live of the Boron isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - Other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Boron nuclides

Nuclide
quantity 1)
spin
Nuclear magnetic
moment
μ/μN
Gyromagnetic
ratio
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
10B
19,65 %
3+
1,8004636(8)2,8758,459(24)4,57520,01985
1,7193
11B
80,35 %
3/2-
2,688378(1)8,5844,059(10)13,66300,16522
1,6045

1) Quantity Percentage of natural occurrence.

2) Related to 1H = 1,000.

 

Literature Sources and References

Properties of the Boron nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Boron: NMR properties - 10B-NMR, 11B-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

 


Category: Isotopes

Last update: 05.07.2020



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