celeritas::ExpNuclearFormFactor Class Reference

Exponential nuclear form factor. More...

#include <NuclearFormFactors.hh>

Inheritance diagram for celeritas::ExpNuclearFormFactor:

Public Member Functions
CELER_FUNCTION	ExpNuclearFormFactor (AtomicMassNumber a_mass)
	Construct from atomic mass number.
CELER_FUNCTION	ExpNuclearFormFactor (InvMomentumSq prefactor)
	Construct with precalculated form factor.
CELER_FUNCTION real_type	operator() (MomentumSq target_momsq) const
	Calculate the exponential folded form factor from the square momentum.
CELER_FUNCTION real_type	operator() (Momentum target_mom) const
	Calculate the exponential folded form factor.
CELER_FORCEINLINE_FUNCTION InvMomentumSq	prefactor () const
	Nuclear form prefactor for the selected isotope.

Static Public Member Functions
static CELER_CONSTEXPR_FUNCTION FFType	ff_type ()
	Form factor type corresponding to this distribution.
Static Public Member Functions inherited from celeritas::NuclearFormFactorTraits
static CELER_CONSTEXPR_FUNCTION InvMomentum	fm_par_hbar ()
	Momentum transfer prefactor: 1 fm / hbar.

Additional Inherited Members
Public Types inherited from celeritas::NuclearFormFactorTraits
using	AtomicMassNumber = AtomicNumber
using	Momentum = units::MevMomentum
using	MomentumSq = units::MevMomentumSq
using	InvMomentum = Quantity< UnitInverse< Momentum::unit_type > >
using	InvMomentumSq = Quantity< UnitInverse< MomentumSq::unit_type > >
using	FFType = NuclearFormFactorType

Detailed Description

Exponential nuclear form factor.

This nuclear form factor corresponds NuclearFormFactorType::exponential and assumes the nuclear charge decays exponentially from its center. This assumes a parameterization of the atomic nucleus valid for light and medium atomic nuclei (Eq. 7 of [BKM2002]):

\[ R_N = 1.27A^{0.27} \,\mathrm{fm} \]

with a special case for the proton radius, \( R_p = 0.85 \) fm.

[BKM2002] A.V. Butkevich, R.P. Kokoulin, G.V. Matushko, S.P. Mikheyev, Comments on multiple scattering of high-energy muons in thick layers, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 488 (2002) 282–294. https://doi.org/10.1016/S0168-9002(02)00478-3.

Todo:

Instead of using this coarse parameterization, we should add nuclear radius to the isotope properties for a more accurate treatment, and construct these classes directly from the atomic radius.

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

• NuclearFormFactors.hh