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/comptonScattering [ Modules ]

[ Top ] [ Modules ]

NAME

module comptonScattering

PURPOSE

This module implements Compton scattering cross sections

INPUTS

The Namelist "comptonScattering_nl" in the Jobcard.


comptonScattering/debug [ Global module-variables ]

[ Top ] [ comptonScattering ] [ Global module-variables ]

SOURCE

  logical, parameter :: debug=.false.

PURPOSE

Switch on debugging output


comptonScattering/compton_crossSection_dOmega [ Functions ]

[ Top ] [ comptonScattering ] [ Functions ]

NAME

function compton_crossSection_dOmega(e_gamma,theta_gamma,charge_Nuc) Result (sigma)

PURPOSE

Evaluates Compton cross section assuming a free nucleon at rest, and a photon momentum along the z-axis.

INPUTS

  • real , intent(in) :: e_gamma ! Photon energy
  • real , intent(in) :: theta_gamma ! Photon scattering angle in degrees
  • integer , intent(in) :: charge_nuc ! Charge of Nucleon
  • integer , intent(in) :: frame ! 1=theta in lab, 2=theta in CM frame

OUTPUT

  • real :: dsigma/dOmega -- cross section dsigma_dOmega in mb/sr

Note that the frame in which "dOmega" is calculated, is defined by the "frame" variable. E.g.: if frame=1 then dOmega=dOmega_lab or if frame=2 then dOmega=dOmega_CM


comptonScattering/getKinematics [ Subroutines ]

[ Top ] [ comptonScattering ] [ Subroutines ]

NAME

subroutine getKinematics(p_in,p_out,q_in,q_out,e_gamma,theta_gamma,frame)

PURPOSE

Evaluates kinematics for compton scattering

INPUTS

  • real , intent(in) :: e_gamma ! Photon energy
  • real , intent(in) :: theta_gamma ! Photon scattering angle in radians
  • integer , intent(in) :: frame ! 1=theta in lab, 2=theta in CM frame

OUTPUT

  • real, dimension(0:3), intent(out) :: p_in,p_out,q_in,q_out

NOTE * Same notations as in compton_crossSection_dOmega


comptonScattering/getSigma [ Functions ]

[ Top ] [ comptonScattering ] [ Functions ]

NAME

function getSigma(p_in,p_out,q_in,q_out,theta_gamma,success) result(sigma)

PURPOSE

Evaluates cross section for compton scattering

INPUTS

  • real, dimension(0:3), intent(in) :: p_in,p_out,q_in,q_out

OUTPUT

  • logical, intent(out) :: success
  • real :: sigma ! dsigma/dOmega (mb/sr)

NOTE * Same notations as in compton_crossSection_dOmega