Bochum 1998 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Hadronen und Kerne

HK 56: Postersitzung

HK 56.82: Poster

Mittwoch, 18. März 1998, 17:00–19:00, Foyer

Nondestructive determination of the ¹³C content in isotopic diamond by nuclear resonance fluorescence — •O. Beck¹, T. Ruf², T.R. Anthony³, D. Belic¹, M. Cardona², T. Eckert¹, Y. Finkelstein⁴, D. Jäger¹, U. Kneissl¹, J. Margraf¹, H. Maser¹, R. Moreh⁴, A. Nord¹, H.H. Pitz¹, and A. Wolpert¹ — ¹Institut für Strahlenphysik, Universität Stuttgart, D-70569 Stuttgart — ²Max-Planck-Institut für Festkörperforschung Stuttgart, D-7056 Stuttgart — ³Ge Corporate Research and Development, Schenectady, NY 12309, USA — ⁴Physics Department, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel

Nuclear resonance fluorescence with a continuous electron-bremsstrahlung beam from the 4.3 MV Stuttgart Dynamitron accelerator [1,2] is used as a nondestructive method to determine the ¹³C content x of bulk isotopic diamonds (¹²C_1−x¹³C_x). The smallest detectable amount of ¹³C in carbon or low Z matrices is on the order of 0.5 mg. The relative accuracy of absolute mass determinations is about ± 7 %. Errors are mainly due to uncertainties in the natural widths Γ of the ¹³C nuclear levels at 3089 and 3684 keV used in the measurements. The results confirm a previous calibration which is based on Raman scattering and the destructive determination of x by mass spectroscopy.
[1] U. Kneissl et al., Prog. Nucl. Part. Nucl. Phys. 37 , (1996), 349.
[2] R. Moreh et al., Phys. Rev. B 56 , (1997), 187.