
TY  - JOUR
A1  - Deutchman, P. A. 
T1  - A New Energy-dependent &#916; Width in Coherent Pion Production
JF  - Australian Journal of Physics
JO  - Aust. J.  Phys.
Y1  - 1999
VL  - 52
IS  - 6
SP  - 955
EP  - 971
KW  - 
UR  - https://doi.org/10.1071/PH99031 
N2  - A new derivation for the energy-dependent &#916; width inside nuclei is presented which includes the all important, energy-dependent nuclear form factor describing the decay of the &#916; particle from its harmonic oscillator, bound state back to a captured nucleon and outgoing pion. Additional improvements include relativistic kinematics, generalisation beyond the static limit in the kinematics, and inclusion of the &#916;N &#928; energy-dependent vertex form factor. The new decay width provides a reasonable cut-off at high pion momenta and gives the correct momentum dependence in the limit of single-particle decay at low momenta. The results of calculations for the energy-dependent widths and their effects on the energy distributions of exclusive coherent pion production for 12 C+ 12 C &rarr; 12 C+ 12 C* (T = 1)+ &#928; 0 at incident energies below and above the pion threshold are shown and discussed. The new energy dependence is compared to the free &#916; width used previously and it is seen that the new results give a smoother and more realistic shape to the pion energy distributions. 
ER  -

