Directory: optical/om-data/
File:      om-alpha.readme (August 30, 2002)
********************************************


			                 om-alpha.tgz

	        Code for calculation of  optical model potential
			             for alpha-particles
	           (provided by S. Kailas on August 30, 2002)
           ************************************************


Content
-------
The om-alpha.f code provides optical model parameters for
alpha-particles using real potential volume integrals of Atzrott et
al. [1], geometry systematics and dispersion relation. The optical
model potentials can be produced in the mass range from A=16 up to
A=208 and for energies ranging from Coulomb barrier up to 150
MeV. More details are provided in the accompanying om-alpha.doc file.


Files
-----
om-alpha.tgz contains:

  - om-alpha.f   : FORTRAN source
  - INPUT        : sample input file
  - OUTPUT       : related output file
  - om-alpha.ps  : description


Format
------
Tarred and gzipped archive. On UNIX/Linux systems use

tar xvzf om-alpha.tgz
or
gunzip om-alpha.tgz
tar xvf om-alpha.tar

to explode the archive. On MS Windows WinZip should be used instead.


Input description
-----------------
Input to the on-alpha code consists of a single line containing

READ(,'(F5.0,F5.0,2F10.3)') AMASS, AZ, EX, ELAB

  AMASS : mass of a target
  AZ    : atomic number of a target
  EX    : energy of the first excited state in the target (used to 
          determine the imaginary potential at energies below the 
          Coulomb barrier)
  ELAB  : energy of alpha particle in the lab system
  
The included input file reads:

 58.0 28.0   1.5       270.0   
 

Platform
--------
Tested by M. Herman on Linux PC with g77 compiler but expected to run
on any system with FORTRAN compiler.


References
----------
[1] U. Atzrott et al. , Phys. Rev. C 53, 13336 (1996).


Contact
-------
S. Kailas, Nuclear Physics Division, BARC, Mumbai 400 085(India)
email:  kailas@magnum.barc.ernet.in