July 23rd , 2014 Geant4 Hadronic Working Group Meeting 1

Hans Wenzel

Geant4 Hadronic Working Group MeetingJuly 23rd 2014

Neutron-induced production of protons, deuterons and tritons and comparison with experimental data

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 2

Outline

• Motivation.• The test setup and the experimental data used for

comparison.• Results for neutron induced production of p,d,t on

Bi,Cu at angles of 54,68,90,121,164 degrees for neutron energies of 317,348,384,426,478,542 MeV, comparison with Geant 4 simulations using the FTFP_BERT and FTF_BIC physics lists.

• Observations.• Availability of the data (experimental and simulation). • Plans.

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 3

Motivation • In the future Fermilab plans to mainly focus on Neutrino physics talked to

the neutrino experiments to find out what experimental data sets they think are important (detector response/production target)

• Test suite to validate Geant 4 against this data sets get feedback from the Geant 4 col. Improve the models

• Provide guidance concerning the best physics list (both for production target and detector response)

• Provide dedicated physics lists.• Steve Dytman provided feedback and a collection of experimental result he

uses for validation of simulation. First Test: Neutron induced production of protons, deuterons and tritons. Data for Bi and Cu from Franz et al (Nuclear Physics A510 (1990) 774-802) extracted from the exfor database(http://www.nndc.bnl.gov/exfor/exfor.htm). Data for C is described in Franz et al (Nuclear Physics A510 (1987) 733-758) but couldn’t find data in ascii format no Carbon results!.

• Identifying spallation reactions might provide a tool to improve hadronic energy resolution in LAr TPC’s.

• Production of spallation protons important to explain event to event compensation in a dual readout calorimeter.

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 4

Motivation (cont.)• LAr TPC’s will provide an unparalleled level of detail in showers and neutrino

interactions, experiments like LAriAT (Liquid Argon in a Test Beam) will expose this type of detectors soon (this summer) to various particle beams opportunity to gain access to data and influence the data they take to validate Geant 4 with. Planned measurements include:

• Visible energy calibration dE/dx, Birks etc. • PID methods• e/gamma shower separation• Muon sign determination• Antiproton stars (tag spallation processes?)• …

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 5

Geant 4 test set up

Target materials: Cu, Bi (thin target (~1mm))Neutron Beam Energies: 317,348,384,426,478,542 MeVAngles: 54,68,90,121,164 degreesPhysics Lists: FTFP_BERT, FTF_BICFramework: artg4tkGeant 4 version: 4.9.6.p02Measurement: rate converted in ds/d O dE

Neutron beam Outgoing

p,d,t

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P,d,t production on Bi, Cu beamenergy 542 MeV

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Proton Production

Target: Cu

Beam: 542 MeV

Green: exp. Data

Blue: BIC

Red: Bertini

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deuteron Production

Target: Cu

Beam: 542 MeV

Green: exp. Data

Blue: BIC

Red: Bertini

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triton Production

Target: Cu

Beam: 542 MeV

Green: exp. Data

Blue: BIC

Red: Bertini

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Proton Production

Target: Bi

Beam: 542 MeV

Green: exp. Data

Blue: BIC

Red: Bertini

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deuteron Production

Target: Bi

Beam: 542 MeV

Green: exp. Data

Blue: BIC

Red: Bertini

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triton Production

Target: Bi

Beam: 542 MeV

Green: exp. Data

Blue: BIC

Red: Bertini

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Proton production at different beam energies (Bertini only)

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Proton Production

Target: Cu

Beam: 317 MeV

Green: exp. Data

Red: Bertini

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Proton Production

Target: Cu

Beam: 347 MeV

Green: exp. Data

Red: Bertini

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Proton Production

Target: Cu

Beam: 383 MeV

Green: exp. Data

Red: Bertini

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Proton Production

Target: Cu

Beam: 425 MeV

Green: exp. Data

Red: Bertini

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 18

Proton Production

Target: Cu

Beam: 477 MeV

Green: exp. Data

Red: Bertini

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 19

Observations

• BIC overall provides better description of the data than Bertini.

• Deuterons especially at low angles are not well described by either model.

• Tritons BIC probably ok for larger angles. • …

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 20

Availability of data

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 21

Allows to select by :target

secondariesreactionbeamenergy….

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Plans

• Look into it in more detail, comparison to proton induced particle production

• Add additional experimental data suggested to us and create tests to simulate it

• Provide scripts to run on the grid, automate analysis can run frequently as new releases become available.

• Collect experimental data and raw simulation results in validation database.

• Work close with LAriAT collaboration.

July 23rd , 2014 Geant4 Hadronic Working Group Meeting 24

Backup slides

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July 23rd , 2014 Geant4 Hadronic Working Group Meeting 26

e.g. Steve Dytman proposed that we look at various experimental data setsrelevant to neutrino detector response. Used Artg4tk to implement test. Very useful will present

the plots to the experts in geant 4 hadronic working group.

will add more tests. Results and exp. data

will be stored in validation repository

Neutron (542MeV) induced proton productionon thin Copper. Comparisonof Franz et. al. data to Bertini and binary cascade model

Expectation: Tell us what processes are important to you tailor physics list to your needs