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\b\f1\fs32 Determination of widths of K-}{\b\f3\fs32 \'61}{\b\f1\fs32  transitions from radiative 2p-electron capture spectra
\par }{\f1 (poster) 
\par 
\par M. Majer(1), M. Uroic(1), B. Vukovic(2) and K. Ilakovac(1) 
\par 
\par (1)Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, HR-10000 Zagreb, Croatia 
\par 
\par (2)Physics Department, Faculty of Pedagogy, University of Osijek, Croatia 
\par 
\par Radiative capture of a 2p-electron by the nucleus shows resonances at photon energies in the regions of K}{\f3 \'61}{\f1  transitions. Shapes of the resonances depend strongly on the natural widths of the K}{\f3 \'61}{\f1 
 lines. Measurements have been made using a pair of germanium detectors in a close 180}{\f1\super 0}{\f1  geometry, in conjunction with a 128*512*512-channel coincidence system. Two-dimensional E1-E2
 spectra (energies of photons detected in one and in the other detector) have been made. The E1-E2 spectra show prominent two-dimensional peaks due to the cascades of K X-rays and L X-rays. Radiative 2p-electron capture events are identified by the coinci
dent detection of capture photons and L X-rays. The L}{\f3 \'61}{\f1 , L}{\f3 \'62}{\f1  and L}{\f3 \'67}{\f1  lines are well separated. The spectrum in the band due to L}{\f3 \'67}{\f1  X-rays shows a single peak at the energy of K}{\f3 \'61}{\f1 
2 X-ray line and a continuum above the peak. The shape of the spectrum allows the determination of the width of the K}{\f3 \'61}{\f1 2 line. Similarly, the spectrum in the band due to L}{\f3 \'61}{\f1  X-rays allows the determination of the width of the K
}{\f3 \'61}{\f1 1 line. Measurements of radiative capture of 2p-electrons have been made in }{\f1\super 179}{\f1 Hf and }{\f1\super 201}{\f1 Tl. The widths of the K}{\f3 \'61}{\f1  
transitions have been derived by fitting the theoretical spectra of radiative 2p-electron capture, modified for realistic K}{\f3 \'61}{\f1  transition energies and for  radiation damping. Somewhat smaller results have been obtained for the widths of the K
}{\f3 \'61}{\f1  lines than the previously reported values.
\par 
\par }{\b\f1 Key words:}{\f1  K X-ray line widths, heavy elements, 2p-electron capture  
\par }{\b\f1 Corresponding author:}{\f1  K. Ilakovac, tel.: +385-1-4680055, fax.: +385-1-4680336, e-mail: ilakovac@phy.hr
\par 
\par }}