The low-energy electron spectrum from the EC-decay of 57Co: 0 eV up to 15 keV |
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| Institution: | 1. Laboratory of Nuclear Problems, JINR, 141980 Dubna, Russia;2. LPRI, DAMRI, CEA, Saclay, France;3. CSNSM, IN2P3, Orsay, France;4. Nuclear Physics Institute, Academy of Sciences of the Czech Republic, 25068 ?e? near Prague, Czech Republic;1. Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL, USA 61801;2. Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, IL, USA 61801;1. Department of Chemical & Biomolecular Engineering, University of Connecticut Storrs, CT 06269-3222, USA;2. Institute of Material Science, University of Connecticut Storrs, CT 06269-3136, USA;3. Department of Mechanical Engineering, University of Connecticut Storrs, CT 06269-3222, USA;1. Graduate school of Natural Science and Technology, Okayama University, Tsushima-naka, Kita-ku, Okayama 700-8530, Japan;2. Green Ferrite Technology Research Association, Tsushima-naka, Kita-ku, Okayama 700-8530, Japan;3. Department of Electronic Engineering, Graduate School of Engineering, Tohoku University, Aramaki-Aza Aoba, Aoba-ku, Sendai 980-8579, Japan;4. College of Design and Manufacturing Technology, Muroran Institute of Technology, Mizumotocho,Mizumotocho, Muroran, Hokkaido 050-0071, Japan;5. Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan;6. Department of Materials Science, Osaka Prefecture University, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan;2. University of California Santa Barbara, Dept. of Physics, Santa Barbara, CA, USA;3. Case Western Reserve University, Dept. of Physics, 10900 Euclid Ave, Cleveland OH 44106, USA;4. Imperial College London, High Energy Physics, Blackett Laboratory, London SW7 2BZ, UK;5. South Dakota School of Mines and Technology, 501 East St Joseph St., Rapid City SD 57701, USA;6. University of Maryland, Dept. of Physics, College Park MD 20742, USA;7. SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3JZ, UK;8. Yale University, Dept. of Physics, 217 Prospect St., New Haven CT 06511, USA;9. Lawrence Livermore National Laboratory, 7000 East Ave., Livermore CA 94551, USA;10. University of South Dakota, Dept. of Physics, 414E Clark St., Vermillion SD 57069, USA;11. Brown University, Dept. of Physics, 182 Hope St., Providence RI 02912, USA;12. LIP-Coimbra, Department of Physics, University of Coimbra, Rua Larga, 3004-516 Coimbra, Portugal;13. University of Rochester, Dept. of Physics and Astronomy, Rochester NY 14627, USA;14. Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA 94720, USA;15. University of California Davis, Dept. of Physics, One Shields Ave., Davis CA 95616, USA;p. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK;q. South Dakota Science and Technology Authority, Sanford Underground Research Facility, Lead, SD 57754, USA;r. University of California Berkeley, Department of Physics, Berkeley, CA 94720, USA;s. Texas A & M University, Dept. of Physics, College Station TX 77843, USA;1. University of California Santa Barbara, Dept. of Physics, Santa Barbara, CA, USA;1. Department of Physical Sciences, Indian Institute of Science Education and Research, Berhampur 760010, India;2. Department of Physics, Indian Institute of Technology, Kharagpur 721302, India;3. Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India |
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| Abstract: | The low-energy electron spectrum from the 57Co decay has been examined in the region from 0 up to 15 keV at instrumental resolution ranging from 2 to 15 eV. Two electrostatic spectrometers and radioactive sources prepared by vacuum evaporation of 57Co onto Al foils were utilized. Relative intensities of the main spectrum components have been obtained as follows: (TSE+LLX+Shake-off)/LMM/KLL/KLM/KMM/K?14.4/L?14.4/MN?14.4=116±12/51±4/59.7±1.8/15.2±0.4/1.15±0.07/49.6±1.5/5.05±0.15/0.79±0.02 where TSE means “true secondary electrons”. Absolute and relative energies of the LMM, KLL, KLM, and KMM Auger transitions in Fe have also been determined, as well as their relative intensities with the exception of the LMM lines, the shapes of which were strongly distorted due to the inelastic electron scattering and probably also chemical effects. From the measured conversion electron lines of the 14.4 keV M1 transition in 57Fe, a transition energy of 14412.8±0.8 eV and the E2 admixture less than 8×10?6 were derived. Relative intensities of both the KL2,3(M4,5N1) Auger line group and the M4,5N1?14.4 conversion line were found to be lower by about 30% for the “oxide” state of decaying 57Co atoms than for the “metallic” state. Pronounced broadenings of narrow spectrum lines have been observed as a consequence of the oxidation of the 57Co sources in the laboratory atmosphere. Natural widths for most of the KLL, KLM, and KMM Auger lines and those of the K, L1, L2, L3, M1, M2, M3 and N1 atomic levels in 57Fe were also determined. |
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