AMS measurements of 41Ca and 55Fe at VERA two radionuclides of astrophysical interest

Details AMS measurements of 41Ca and 55Fe at VERA two radionuclides of astrophysical interest AMS measurements of 41Ca and 55Fe at VERA two radionuclides of astrophysical interest

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007nimpb.259..677w&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, Volume 259, Issue 1, p. 677-682.

Physics

Nuclear Physics

6

Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Big Bang Nucleosynthesis, Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments, Mass Spectrometry

Scientific paper

The potential for measuring the radionuclides 41Ca and 55Fe was investigated with the 3 MV tandem accelerator at VERA. Interestingly, up to now, no applications have been published for 55Fe using the technique of AMS. This is in strong contrast to 41Ca, which is routinely measured by medium and large tandem accelerators in various applications. Using CaF2 samples the quantification of 41Ca down to levels of a few 10-13 for the isotope ratio 41Ca/Ca has become possible with the use of the ΔTOF technique. Both nuclides, 41Ca and 55Fe were found to be of interest in nuclear astrophysics. A first application of 41Ca detection at VERA is the measurement of the 40Ca(n, γ)41Ca cross section at stellar temperatures. Similarly, of astrophysical interest is the production of 55Fe via neutron capture on 54Fe. To this end, different Ca and Fe blank and standard samples were investigated with the goal to establish an AMS method for 41Ca and 55Fe measurements. Indeed, low background levels for both radionuclides, 41Ca and 55Fe, were observed in these studies. The full separation power of VERA results in a very low detection limit, while still providing a high overall transmission.

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