The reaction keyword Sets the B(F) and B(GT) matrix elements for a - - PowerPoint PPT Presentation

The reaction keyword

• Sets the B(F) and B(GT) matrix elements for a cross section

calculation

• The format of this command is

reaction FILE

• FILE is the name (and full path, if needed) of a file that contains the

evaluated matrix elements and a little more information about the reaction – reactant and product PDG codes – labels for whether each matrix element is F or GT – reaction description string

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The reaction keyword

• See ve40ArCC_1998.react for an example of the data format
• At least one reaction must be defined in the configuration file
• If multiple reaction lines appear, then MARLEY will use all of them
• Two reaction datasets are included in this release, both for

charged-current 𝜉

e on 40Ar

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The source keyword

• Sets the incident neutrino spectrum to use in a MARLEY calculation
• All spectra that are supplied by the user to MARLEY should not be

cross-section weighted.

• MARLEY uses its own cross section model to do the appropriate

weighting

• The format of this command is

source NU_TYPE STYLE STYLESPEC

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The source keyword

source NU_TYPE STYLE STYLESPEC

• NU_TYPE is the kind of neutrino produced by the source

– PDG code (e.g., 𝜉

e = 12)

– strings: ve, vebar, vu, vubar, vt, vtbar

• STYLE is the kind of source to use

– mono (monoenergetic) – fd (fermi-dirac) – dar (𝜈 decay-at-rest) – bf (“beta-fit” spectrum) – hist (histogram) – grid (interpolation grid) – th1 / tgraph (ROOT TH1 or TGraph from a file)

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The source keyword

source NU_TYPE STYLE STYLESPEC

• STYLESPEC contains extra STYLE-dependent parameters for the

source Examples

• source ve fd Emin Emax T [𝜃]
• Defines a Fermi-Dirac source that is sampled between Emin and Emax

(both MeV).

• The temperature T must be specified (MeV), and an optional

pinching parameter 𝜃 may be given (default 𝜃 = 0)

• 𝑄(𝐹) =

𝐷𝐹2 𝑈 4 [1 + exp(𝐹

𝑈 − 𝜃)]

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The source keyword

Examples

• source ve dar
• Defines a muon decay-at-rest 𝜉

e source

• The Michel spectrum doesn’t need any additional parameters
• source ve mono E
• Defines a monoenergetic source with energy E (MeV)
• For the full description of the source keyword, see the first section
• f the manual

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