pinspec.slbw Namespace Reference

The slbw module provides utility functions to generate resonant cross-sections using the Single-Level Breit-Wigner formalism. More...

Functions
def	buildSLBWXS
	Function to create resonant capture and scatter cross-sections. More...
def	convert
	Function to convert a string into a float. More...
def	parse
	Function to parse a string and convert into resonance parameters. More...
def	generatePotentialScattering
	Function to generate a potential scattering cross-section for an isotope based on data in a resonance parameters file. More...
def	compareXS
	Function to generate a plot of the SLBW generated cross-section along with the ENDF-VII version of the cross-section for comparison. More...

Detailed Description

The slbw module provides utility functions to generate resonant cross-sections using the Single-Level Breit-Wigner formalism.

This is most helpful for PINSPEC applications which are temperature- dependent and require doppler broadening effects to be treated for resonant absorbers.

Author

Jessica Hunter

Date

April 17, 2013

Function Documentation

def pinspec.slbw.buildSLBWXS	(		isotope,
			temp,
			xs_type = 'capture',
			number_of_pos_res = 14,
			energy_min = 1e-5,
			energy_max = 20E6,
			upper_energy_limit_identical_res = 1000.0,
			energy_bin_width = 0.075,
			resonance_spacing_identical_res = 25,
			lower_bound_identical_res = 300,
			gamma_gamma_identical_res = 0.023,
			flat_xs = 0.1
	)

Function to create resonant capture and scatter cross-sections.

Generates the cross-section at some temperature using resonance data and the Single-Level Breit-Wigner formalism. Function broadens a specific number of resonances from the ENDFB-VII library, then creates identical resonances with even spacing to a specified energy limit, and then a specific flat cross section for the remaining energy. When generating elastic cross sections, the flat cross section is set to the potential scattering value.

temp=1200
slbw.SLBWXS(u238, temp, 'capture')

Parameters

isotope	the isotope of interest
temp	the temperature in degrees Kelvin
xs_type	an optional argument string for the cross-section type
number_of_pos_res	the number of positive resonance to use with
energy_min	the minimum energy at which to generate the cross-section (eV)
energy_max	the maximum energy of the cross section (eV)
upper_energy_limit_identical_res	the upper energy limit of the equally spaced, identical resonances section
energy_bin_width	the width of the energy bin for the cross section
resonance_spacing_identical_res	the spacing between resonance peaks for the identical resonances section
lower_bound_identical_res	the lower energy bound for the identical resonances section
gamma_gamma_identical_res	the value for the identical resonances section
flat_xs	a flat cross section used for the capture cross section above the identical resonances region

def pinspec.slbw.compareXS	(		isotope,
			type_xs = 'capture',
			dir = '.'
	)

Function to generate a plot of the SLBW generated cross-section along with the ENDF-VII version of the cross-section for comparison.

Parameters

isotope	the isotope of interest
type_xs	type of cross section, 'capture' or 'elastic' ('scatter' also accepted)
dir	the directory in which the plot will be saved

def pinspec.slbw.convert

(

string

)

Function to convert a string into a float.

Parameters

string

the string we wish to convert

Returns

the float version of the input string

def pinspec.slbw.generatePotentialScattering	(		isotope,
			energy_min = 1e-5,
			energy_max = 20E6
	)

Function to generate a potential scattering cross-section for an isotope based on data in a resonance parameters file.

Parameters

isotope	the isotope of interest
energy_min	the upper limit of the energy range
energy_max	the lower limit of the energy range

def pinspec.slbw.parse

(

string

)

Function to parse a string and convert into resonance parameters.

Function to parse a resonance parameter string into , , and .

Parameters

string

the string of interest