Input files

Both the BSG and NME library function using two input files

  • Transition-specific input file

  • General configuration file

Both are written in typical Windows-INI style. While both libraries add a number of options to both of these, there is significant overlap. We discuss these here in turn. Options specific to both libraries can be found at Using the BSG spectrum calculation and Nuclear Matrix Element usage.

Transition-specific input file

This file deals with the beta transition for which the quantities are to be calculated. It contains three headers: Transition, Mother and Daughter. The last two are identical in form. An example is given below for the \(\beta^+\) decay of \(^{19}\) Ne

[Transition]
;Process can be: B+ (beta+), B- (beta-) or EC (electron capture)
Process=B+
;Type can be Gamow-Teller, Fermi or Mixed
Type=Gamow-Teller
;Mixing ratio is defined as g_A M_{GT}/g_V M_F
MixingRatio = 0.0
;Q Value is defined ground-state to ground state Q value in keV
QValue=3238.4

[Mother]
;Proton number of the mother nucleus
Z=10
;Mass number of the mother
A=19
;Mean charge radius in femtometer
Radius=3.0082
;Quadrupole and higher-order deformations
Beta2=0.269
Beta4=0.182
Beta6=0.070
;Double of the spin x parity of the nuclear state, always a (negative) integer
SpinParity=1
;Excitation energy relative to the ground state in keV
ExcitationEnergy=0.
;Double of isospin of the nuclear state if known, always an integer
Isospin=1

[Daughter]
Z=9
A=19
Radius=2.8976
Beta2=0.262
Beta4=0.180
Beta6=0.025
SpinParity=1
ExcitationEnergy=0.
Isospin=1

Note, if you get a boost error you can either remove all the lines starting with ; of replace the ; with #.

General configuration file

The general configuration file defaults to config.txt and contains straightforward options. A documented example is given below

[General]
;Folder to put the output results
Folder=.

[Constants]
;Axial vector coupling constant
gA=1.2723
;Induced pseudoscalar coupling constant, relative to the nucleon mass
gP=0.0
;Weak magnetism coupling constant
gM=4.706