Summary of activities of the WG on Cosmogenic activation in JRA2/IDEA (during first 18 months) Susana Cebrián Web page: Documents under password: user and password “idea”

1.Collection of available data on production cross sections: Detailed report at task1.pdf task1.pdf Search for p/n activation cross-sections on targets of interest (Ge, Te) on the literature and from nuclear data libraries

Some experimental results are available for relevant production  at fixed energies on Te and Ge from individual references and the EXFOR database, coming from proton irradiation experiments o Not sufficient for a complete activation study but extremely useful to check complementary calculations S. Cebrián, Cosmogenic Induced ActivityIDEA meeting, Heidelberg, October 2004 Conclusions for Task 1 The MENDL libraries offer reliable excitation functions for many targets and products up to 100 MeV for n and 200 MeV for p Some evaluated excitation functions have been derived for some products on Ge isotopes

1.Collection of available data on production cross sections: Detailed report at task1.pdf task1.pdf Analysis of computational codes for n/p activation: Detailed report at task2.pdf task2.pdf More info on the transparencies presented at the IDEA Meetings in Heidelberg, October 2004, and Paris, April 2005, available at the IDEA website. Collect information on: Target materials and product isotopes covered Projectiles allowed Range of applicable energies Physical models included and/or experimental data sets considered for cross-sections Checks with experimental data “Technical” information: language, code source, support,... Search for p/n activation cross-sections on targets of interest (Ge, Te) on the literature and from nuclear data libraries

Monte Carlo codes + neutron activation studies possible - very time-consuming (specially for some products) General-purpose MC codes + wide coverage of projectiles, targets and energies in principle + easy availability and support + different models can be used for the hadronic physics - not many comparisons with measurements of activation yields available Semiempirical codes + wide coverage of targets and products + short calculation time and simplicity of use - only proton-induced reactions Conclusions for Task 2 S. Cebrián, Cosmogenic Induced ActivityIDEA meeting, Paris, April 2005 COSMO,SIGMA, YIELDX HETC, LAHET, CEM, ALICE, CASCADE, SHIELD, and many others! GEANT4, FLUKA, MCNPX

3.Study of particular activation problems relevant for DBD Description of interesting excitation functions and calculation of production rates for a particular cosmic ray spectrum, comparing different sources of cross section data including measurements and calculations a)Activation in TeO 2 GEANT4 hadronic models considered and compared with experimental data See details on the transparencies presented at the IDEA Meeting in Heidelberg, October 2004, available at the IDEA website.

Results from p irradiation on natural Te at 1.85 GeV in Berkeley vs GEANT4 simulation with different models  Comparison data- calculations for  modeldeviation factor F user physics list33.5 QGSP17.4 LHEP-BIC18.9 LHEP-BERT2.3 model chosen S. Cebrián, Cosmogenic Induced ActivityIDEA meeting, Heidelberg, October 2004

3.Study of particular activation problems relevant for DBD Description of interesting excitation functions and calculation of production rates for a particular cosmic ray spectrum, comparing different sources of cross section data including measurements and calculations a)Activation in TeO 2 GEANT4 hadronic models considered and compared with experimental data See details on the transparencies presented at the IDEA Meeting in Heidelberg, October 2004, available at the IDEA website. b)Activation in Ge See details on the transparencies presented at the IDEA Meeting in Paris, April 2005, available at the IDEA website, and in presentation by S. Cebrian et al at TAUP2005

S. Cebrián, Cosmogenic Induced ActivityIDEA meeting, Paris, April 2005 ALICE codes seem to be the most reliable at low energies and semiempirical YIELDX at high energies Conclusions for Task 3 Conclusions regarding codes  to what extent are equal  for neutrons and protons at medium-high energies?  good prediction capabilities for proton production  at low energies imply the same for neutron production  ? but …

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