About   |   More   |   Search
ChemLin Logo

Boron-19

Properties and data of the isotope 19B.


Contents

 

Boron-19 isotope

Boron-19 is a radioisotope of the chemical element boron, which has 14 neutrons in its atomic nucleus in addition to the element-specific 5 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 19. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 19B is exclusively for academic purposes.

The discovery of the neutron-rich nuclide was reported in 1984 [1]. It was artificially produced by irradiating beryllium with a beam of accelerated iron-56 nuclei.

See also: list of Boron isotopes.

 

General data

Name of the isotope:Boron-19; B-19Symbol:19B or 195BMass number A:19 (= number of nucleons)Atomic number Z:5 (= number of protons)Neutrons N:14Isotopic mass:19.06417(56) u (atomic weight of Boron-19)Nuclide mass:19.0614271 u (calculated nuclear mass without electrons)Mass excess:59.77397 MeVMass defect:0.096263984 u (per nucleus)Nuclear binding energy:89.66932351 MeV (per nucleus)
4.71943808 MeV (average binding energy per nucleon)
Separation energy:SN = 0.094(564) MeV (first neutron)Half-life:2.92(13) msDecay constant λ:237.37917142464 s-1Specific activity α:7.523846355443 × 10+24 Bq g-1
2.033471987957 × 10+14 Ci g-1
Spin and parity:
(nuclear angular momentum)
3/2-Year of discovery:1984

 

Radioactive Decay

Half-life T½ = 2.92(13) ms respectively 2.92 × 10-3 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
β-, n18C71 %
β-, 2n17C17 %
β-19C> 2.9 %
β-, 3n16C< 9.1 %

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 14) and isobaric (same nucleon number A = 19) with Boron-19. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 14Isobar A = 19
519B19B
620C19C
721N19N
822O19O
923F19F
1024Ne19Ne
1125Na19Na
1226Mg19Mg
1327Al
1428Si
1529P
1630S
1731Cl
1832Ar
1933K
2034Ca

 

External data and identifiers

Adopted Levels, Gammas:NuDat 19B

 

Literature and References

[1] - J. A. Musser, J. D. Stevenson:
First Observation of the Neutron-Rich Isotope 19B.
In: Physical Review Letters, 53, 2544, (1984), DOI 10.1103/PhysRevLett.53.2544.

[2] - J. Casal, E. Garrido:
Three-body structure of 19B: Finite-range effects in two-neutron halo nuclei.
In: Physical Review C, 102, 051304(R), (2020), DOI 10.1103/PhysRevC.102.051304.

 


More Chemistry

isotopes

Social Media

Facebook

LinkedIn

Twitter


Last update: 2024-09-23


© 1996 - 2025 ChemLin