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Isotopes of Beryllium

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

 

Beryllium isotopes

12 isotopes or nuclides of the element beryllium are known, of which only one - 9Be - is stable. This makes beryllium a pure element and the only monoisotopic chemical element with an even number of protons in the nucleus.

The atomic mass of beryllium is 9.0121831(5) u.

 

Naturally Occurring Beryllium Isotopes

Beryllium-9 is the only stable isotope found on earth. The smallest traces of the radioactive nuclides 7Be and 10Be can be detected as radioisotopes of cosmic origin.

 

The beryllium-11 atom is one of the so-called halo nuclei; it consists of 4 protons and 6 neutrons in the nucleus and a weakly bound neutron outside this nucleus; one speaks of a 1-neutron halo [8].

 

Isotope Table: Beryllium

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
5Be451Beryllium-55.039870(2150) u
[5.0376757 u]
{37.13867 MeV}
6Be462Beryllium-66.019726(6) u
[6.0175317 u]
{18.37465 MeV}
0+
7Be473Beryllium-77.01692872(8) u
[7.0147344 u]
{15.769 MeV}
3/2--1.399280(4)
8Be484Beryllium-88.00530510(4) u
[8.0031108 u]
{4.94167 MeV}
0+8B
8Li
9Be495Beryllium-99.012183050(82) u
[9.0099887 u]
{11.34844 MeV}
3/2--1.177430(5)9Li
10Be4106Beryllium-1010.01353469(9) u
[10.0113404 u]
{12.60748 MeV}
0+11Li
11Be4117Beryllium-1111.02166108(25) u
[11.0194668 u]
{20.17717 MeV}
1/2+-1.6816(8)11Li
12Be4128Beryllium-1212.0269221(2) u
[12.0247278 u]
{25.07777 MeV}
0+
12mBe4128Beryllium-12m12.0269221(2) u
[12.0247278 u]
{25.07777 MeV}
0+
13Be4139Beryllium-13130.36135(11) u
[13.0334559 u]
{33.20793 MeV}
(1/2-)
14Be41410Beryllium-1414.04289(14) u
[14.0406957 u]
{39.95178 MeV}
0+
15Be41511Beryllium-1515.05349(18) u
[15.0512957 u]
{49.82561 MeV}
(5/2+)
16Be41612Beryllium-1616.06167(18) u
[16.0594757 u]
{57.44523 MeV}
0+

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
Be-5p → 3He100 %AL
Be-65.0(3) × 10-21 s2p → 4He
α

4.288 MeV
AL
Be-753.22(6) dEC → 7Li100 %0.86189(7) MeVAL
Be-88.19(37) × 10-17 sα → 4He100 %0.09184(4) MeVAL
Be-9stableAL
Be-101.51(4) × 106 aβ-10B100 %0.55688(8) MeVAL
Be-1113.76(7) sβ-11B
β-, α → 7Li
β-, p
97.1 %
2.9 %
0.00083(9) %
11.50946(24) MeV

AL
Be-1221.46(5) msβ-12B
β-, n → 11B
99.5 %
0.50(3) %
11.7084(23) MeV
8.3387(19) MeV
AL
Be-12m230(8) nsIso → 12Be100 %2.251(1) MeV2.251(1) MeV
Be-132.7(18) × 10-21 sn 12Be?AL
Be-144.35(17) msβ-14B
β-, n → 13B
β-, 2n → 12B
14 %
81(4) %
5(2) %
16.29(13) MeV
15.32(13) MeV
AL
Be-157.9(27) × 10-22 sn 14Beca. 100 %AL
Be-166.5(13) × 10-22 s2n 14Be20.42 MeVAL

 

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 Beryllium isotope.
6 - Relative atomic mass of the Beryllium 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 Beryllium 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 Beryllium 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)
9Be
100 %
3/2-
-1,177430(5)- 3,9575+ 5,288(38)5,98420,01388
0,7028

1) Quantity Percentage of natural occurrence.

2) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Beryllium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Be-7107 Bq10 Bq/g1 TBq100 Bq/cm253.2 d
Be-10106 Bq100 Bq/g1000 TBq1.6 × 106 a

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Beryllium 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.

Beryllium: NMR properties - 9Be-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.

[9] - NN:
Atomkern mit Heiligenschein.
In: Wissenschaftler vermessen erstmals Ein-Neutron-Halo mit Lasern, Internetchemie News, (2009), DOI https://www.internetchemie.info/news/2009/feb09/beryllium-atomkern-mit-heiligenschein.php.

 


Category: Isotopes

Last update: 05.07.2020



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