marley::HelmNuclearFormFactor Class Reference

#include <NuclearFormFactor.hh>

Inheritance diagram for marley::HelmNuclearFormFactor:

Public Member Functions
	HelmNuclearFormFactor (int Z, int A)
double	a () const
double	c () const
virtual double	F (double kappa) const override final
double	s () const
void	set_a (double a)
void	set_c (double c)
void	set_s (double s)
void	update_effective_radius ()
Public Member Functions inherited from marley::NuclearFormFactor
	NuclearFormFactor (int Z, int A)
int	A () const
int	Z () const

Protected Attributes
double	a_ = 0.52
double	c_
double	R_
	Effective nuclear radius (fm)
double	s_ = 0.9
	Nuclear skin thickness parameter (fm)
Protected Attributes inherited from marley::NuclearFormFactor
int	A_
	Nucleon number.
int	Z_
	Proton number.

Additional Inherited Members
Static Public Member Functions inherited from marley::NuclearFormFactor
static std::shared_ptr< marley::NuclearFormFactor >	create (int Z, int A, const JSON &ff_config)

Detailed Description

Implements a nuclear form factor based on Phys. Rev. 104, 1466 (1956). Parameter values are taken J. Cosmol. Astropart. Phys. 4, 012 (2007) which itself took fit results from Astropart. Phys. 6, 87 (1996)

Definition at line 82 of file NuclearFormFactor.hh.

Constructor & Destructor Documentation

HelmNuclearFormFactor()

marley::HelmNuclearFormFactor::HelmNuclearFormFactor ( int Z, int A )

inline

Definition at line 85 of file NuclearFormFactor.hh.

                                                   : NuclearFormFactor( Z, A )
      {
        c_ = 1.23*std::pow( A, marley_utils::ONE_THIRD ) - 0.6; // fm
        this->update_effective_radius();
      }

Member Function Documentation

a()

double marley::HelmNuclearFormFactor::a ( ) const

inline

Definition at line 101 of file NuclearFormFactor.hh.

{ return a_; }

c()

double marley::HelmNuclearFormFactor::c ( ) const

inline

Definition at line 108 of file NuclearFormFactor.hh.

{ return c_; }

F()

double marley::HelmNuclearFormFactor::F ( double kappa ) const

finaloverridevirtual

Evaluate the nuclear form factor at a given 3-momentum transfer

Parameters

kappa

Magnitude of the 3-momentum transfer (MeV)

Implements marley::NuclearFormFactor.

Definition at line 90 of file NuclearFormFactor.cc.

                                                          {
  if ( kappa == 0. ) return 1.;
  double kappa_in_inverse_fm = kappa / marley_utils::hbar_c;
  double x = kappa_in_inverse_fm * R_;
  double j1 = ( std::sin( x ) / x - std::cos( x ) ) / x;
  double F = 3. * j1 / x * std::exp( -kappa_in_inverse_fm
    * kappa_in_inverse_fm * s_ * s_ / 2. );
  return F;
}

References F(), R_, and s_.

Referenced by F().

s()

double marley::HelmNuclearFormFactor::s ( ) const

inline

Definition at line 95 of file NuclearFormFactor.hh.

{ return s_; }

set_a()

void marley::HelmNuclearFormFactor::set_a ( double a )

inline

Definition at line 103 of file NuclearFormFactor.hh.

                                    {
        a_ = a;
        this->update_effective_radius();
      }

set_c()

void marley::HelmNuclearFormFactor::set_c ( double c )

inline

Definition at line 109 of file NuclearFormFactor.hh.

                                    {
        c_ = c;
        this->update_effective_radius();
      }

set_s()

void marley::HelmNuclearFormFactor::set_s ( double s )

inline

Definition at line 96 of file NuclearFormFactor.hh.

                                    {
        s_ = s;
        this->update_effective_radius();
      }

update_effective_radius()

void marley::HelmNuclearFormFactor::update_effective_radius ( )

inline

Definition at line 114 of file NuclearFormFactor.hh.

                                            {
        R_ = marley_utils::real_sqrt( c_*c_ + 7.*marley_utils::pi
          *marley_utils::pi*a_*a_/3. - 5.*s_*s_ );
      }

Member Data Documentation

a_

double marley::HelmNuclearFormFactor::a_ = 0.52

protected

Definition at line 124 of file NuclearFormFactor.hh.

c_

double marley::HelmNuclearFormFactor::c_

protected

Definition at line 125 of file NuclearFormFactor.hh.

R_

double marley::HelmNuclearFormFactor::R_

protected

Effective nuclear radius (fm)

Definition at line 128 of file NuclearFormFactor.hh.

Referenced by F().

s_

double marley::HelmNuclearFormFactor::s_ = 0.9

protected

Nuclear skin thickness parameter (fm)

Definition at line 123 of file NuclearFormFactor.hh.

Referenced by F().

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The documentation for this class was generated from the following files:

• /home/sjg/Desktop/marley/include/marley/NuclearFormFactor.hh
• /home/sjg/Desktop/marley/src/NuclearFormFactor.cc