Abstract
view Abstract Citations (33) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A 25 M Angstrom Isotope Shift in B i at 2090 Angstrom : A Possible Diagnostic of the Cosmic 11B/ 10B Ratio? Johansson, Sveneric G. ; Litzen, Ulf ; Kasten, Joerg ; Kock, Manfred Abstract 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. Publication: The Astrophysical Journal Pub Date: January 1993 DOI: 10.1086/186713 Bibcode: 1993ApJ...403L..25J Keywords: Astronomical Spectroscopy; Boron Isotopes; Galactic Evolution; Absorption Spectra; Abundance; Cosmic Rays; Hubble Space Telescope; Nuclear Astrophysics; Spectrum Analysis; Astrophysics; ATOMIC DATA; LINE: IDENTIFICATION; GALAXY: EVOLUTION; ULTRAVIOLET: STARS full text sources ADS |
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