A 25 mA isotope shift in B I at 2090 A - A possible diagnostic of the cosmic B-11/B-10 ratio?

Details A 25 mA isotope shift in B I at 2090 A - A possible diagnostic of the cosmic B-11/B-10 ratio? A 25 mA isotope shift in B I at 2090 A - A possible diagnostic of the cosmic B-11/B-10 ratio?

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403l..25j&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 403, no. 1, p. L25-L28.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Spectroscopy, Boron Isotopes, Galactic Evolution, Absorption Spectra, Abundance, Cosmic Rays, Hubble Space Telescope, Nuclear Astrophysics, Spectrum Analysis

Scientific paper

We present the first laboratory measurement of the isotope shift in a ground term transition of neutral boron, B I, performed with the VUV-Fourier Transform Spectrometer at Lund. The two diagonal transitions in the UV 2 multiplet of B I at 2090 A have a net isotope shift of 25 mA. This matches a spectral resolution of about 85,000, obtainable with the high-resolution spectrograph GHRS on board the Hubble Space Telescope. The oscillator strength of the strongest line at 2089.6 A is about the same as for the weakest line in the UV 1 multiplet at 2496.8 A, often used in abundance studies of boron. Furthermore, the lines at 2090 A are outside the compact resonance region of singly ionized iron-group elements between 2300 and 2700 A. A preliminary study of a synthetic spectrum in this region indicates that the 2089.6 A line is free from blends of lines from high-abundance elements. We propose the use of the B I lines at 2090 A for studies of the abundance and the cosmic isotope composition of neutral boron to test the theories for boron production by big bang nucleosynthesis and cosmic-ray spallation.

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