Beryllium-11

Properties and data of the isotope ¹¹Be.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

Beryllium-11 is a radioisotope of the chemical element Beryllium, which, in addition to the element-specific 4 protons, has 7 neutrons in the atomic nucleus, resulting in the mass number 11.

The artificial, unstable and therefore radioactive nuclide ¹¹Be has a one-neutron halo nucleus.

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

General data

Name of the isotope:Beryllium-11; Be-11Symbol:¹¹Be or 114BeMass number A:11 (= number of nucleons)Atomic number Z:4 (= number of protons)Neutrons N:7Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.75 (= neutron-proton ratio)Neutron excess (N-Z):3Isotopic mass:11.02166108(26) u (atomic weight of Beryllium-11)Nuclide mass:11.0194668 u (calculated nuclear mass without electrons)Mass excess:20.17717 MeVMass defect:0.07029346 u (per nucleus)Nuclear binding energy:65.47793623 MeV (per nucleus)
5.95253966 MeV (average binding energy per nucleon)Separation energy:S_N = 0.50164(25) MeV (first neutron)
S_P = 20.164(13) MeV (first proton)Half-life:13.76(7) sDecay constant λ:0.050374068354647 s^-1Specific activity α:2.757815775634 × 10⁺²¹ Bq g^-1
74535561503.627 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Isobaric spin: 3/2Magnetic dipole moment:μ(μ_N) = -1.6816(8)Nuclear g-factor:g_l = -3.3632Charge radius:2.463(15) femtometer fmMirror nucleus:Nitrogen-11Year of discovery:1958

Radioactive Decay

Half-life T_½ = 13.76(7) s respectively 1.376 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	¹¹B	96.9 %	11.50946(24) MeV
β^-, α	⁷Li	3.1(4) %
β^-, p	¹⁰Be	0.00083(9) %

Parent Nuclides

Direct parent isotope is: ¹¹Li.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 7) and isobaric (same nucleon number A = 11) with Beryllium-11. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 7	Isobar A = 11
2	⁹He
3	¹⁰Li	¹¹Li
4	¹¹Be	¹¹Be
5	¹²B	¹¹B
6	¹³C	¹¹C
7	¹⁴N	¹¹N
8	¹⁵O	¹¹O
9	¹⁶F
10	¹⁷Ne
11	¹⁸Na
12	¹⁹Mg
13	²⁰Al

External data and identifiers

Adopted Levels, Gammas:NuDat 11Be

Literature and References

[1] - F. Barranco, G. Potel, R. A. Broglia, E. Vigezzi:
Structure and Reactions of ¹¹Be: Many-Body Basis for Single-Neutron Halo.
In: Physical Review Letters, 119, 082501, (2017), DOI 10.1103/PhysRevLett.119.082501.

[2] - L. Moschini, J. Yang, P. Capel:
From Halo Effective Field Theory to the study of breakup and transfer reactions: reliably probing the halo structure of ¹¹Be and ^15C.
In: Journal of Physics: Conference Series, 1610, 012010, (2020), DOI 10.1088/1742-6596/1610/1/012010.