| dc.description |
The problem of bound-pion absorption by nuclei has been studied in a semimicroscopic way. Calculations of the widths of the 1s, 2p and 3d levels in <sup>12</sup>C, <sup>14</sup>N, <sup>16-18</sup>O, <sup>19</sup>F, <sup>20</sup>Ne, <sup>23</sup>Na, <sup>24-26</sup>Mg, <sup>27</sup>Al, <sup>28</sup>Si, <sup>31</sup>P, <sup>32</sup>S, <sup>35</sup>Cl, <sup>39</sup>K, <sup>40</sup>Ar, <sup>40-48</sup>Ca, <sup>46-50</sup>Ti, <sup>51</sup>V and <sup>52</sup>Cr and the 4f level in <sup>209</sup>Bi pi <sup>-</sup>-atoms based on the nuclear self-consistent theory of Birbrair et al. (1978) and Alkhazov et al. (1978) are performed assuming that the 'two-nucleon' mechanism is the doorway process for nuclear pion absorption (Birbrair and Kalashnikov). Both P and S absorption mechanisms together with their interference are included here. This enables us to calculate the widths of the 1s levels where S absorption dominates. The results are in good agreement with experiment. |
