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V.F. Batyaev, I.V. Kirpichnikov, V.N. Kornoukhov* , Yu.E.Titarenko, A.A.Vasenko, V.M. Zhivun

LAL, Orsay IDEA meeting 14-15.04.2005 Validation of excitation functions of 60 Co and 68 Ge production on germanium isotopes. V.F. Batyaev, I.V. Kirpichnikov, V.N. Kornoukhov* , Yu.E.Titarenko, A.A.Vasenko, V.M. Zhivun ITEP (Moscow, Russia) A.Caldwell, … MPI (Munchen, Germany)

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V.F. Batyaev, I.V. Kirpichnikov, V.N. Kornoukhov* , Yu.E.Titarenko, A.A.Vasenko, V.M. Zhivun

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  1. LAL, Orsay IDEA meeting 14-15.04.2005Validation of excitation functions of 60Co and 68Ge production on germanium isotopes • V.F. Batyaev, I.V. Kirpichnikov, V.N. Kornoukhov*, Yu.E.Titarenko, A.A.Vasenko, V.M. Zhivun ITEP (Moscow, Russia) A.Caldwell,… • MPI (Munchen, Germany) • S.Schoenert,... • MPIK (Heidelberg, Germany) (*) for contacts: kornoukhov@itep.ru kornoukhov@mail.ru

  2. LAL, Orsay IDEA meeting 14-15.04.2005Plan of the report • Activation at sea level • Cosmic rays at sea level • Review of Ge(n,x)60Co and Ge(n,x)68Ge excitation functions •  Objectives of the proposal • Layout of experiment • Production rates of 60Co and 68Ge • Uncertainties of the experiment

  3. LAL, Orsay IDEA meeting 14-15.04.2005Isotopes production rate (activation) dN/dt = Ntarget*(E)*(E)dE (E) – excitation function (E) – hadrons (neutrons + protons) flux at sea level

  4. Codes used to calculate excitation functions…

  5. ISABEL-simulated excitation functions for 68Ge and 60Co production in Ge isotopes

  6. SHIELD-simulated excitation functions for 68Ge and 60Co production in Ge isotopes

  7. Excitation functions of production of the isotope Ge68 at interaction of NEUTRONS with nuclei-targets NatGe, Ge70, Ge74 and Ge76. Comparison of calculations using the codes SHIELD (INR RAS), LAHET (ITEP) and ISABEL (Majorana White Book). N.Sobolevsky and A.Denisov, INR RAS, Dec. 2004

  8. Excitation functions of production of the isotopes Ge68 and Co60 at interaction of PROTONS with nuclei-targets NatGe, Ge70 and Ge76. Comparison of calculations using the codes SHIELD (INR RAS) and LAHET (ITEP) with experimental data. N.Sobolevsky and A.Denisov, INR RAS, Dec. 2004

  9. Excitation functions of production of the isotope Ge68 at interaction of PROTONS with nuclei-targets NatGe, Ge70, Ge74 and Ge76. Comparison of calculations using the codes SHIELD (INR RAS) and LAHET (ITEP). N.Sobolevsky and A.Denisov, INR RAS, Dec. 2004

  10. LAL, Orsay IDEA meeting 14.04.2005Objectives of the proposal 1. Determination of production rate of the reactions (for En < 800 MeV). 2. Estimationof total production rates of Ge-68 and Co-60 on Ge isotopes. 3. Verification of models and codes. Selection of adequate one. 4. Estimation of the excitation functions.

  11. Irradiation of thin targets U10 Synchrotron at ITEP: • Proton energy: 40-10000 MeV; • Beam section: a circle of ~ 10 mm; • Intensity: ~(12)1011 protons per pulse; • Extraction runs: 1-4 50-ns bunches spaced 150 ns apart.

  12. LAL, Orsay IDEA meeting 14-15.04.2005Strategy of the experiment There are two approach how to run the experiment: • Three sets of the Ge targets are placed at three different positions/angles (a set means 70Ge, 72Ge, 73Ge, 74Ge, 76Ge sample). 2. Three sets of the Ge targets are placed at one position (30o – 60o) and irradiated (one by one) with three different energy of protons: 115 MeV, 256 MeV and 800 MeV.

  13. LAL, Orsay IDEA meeting 14.04.2005A schematic of arrangement of the Ge-samples around the proton-irradiated W target

  14. LAL, Orsay IDEA meeting 14-15.04.2005Measured and calculated neutron spectrum at different angles (if Ep = 800 MeV)

  15. Particles Spectrum at 30o, 90o, and 150o 60o seems to be better option

  16. LAL, Orsay IDEA meeting 14-15.04.2005

  17. LAL, Orsay IDEA meeting 14-15.04.2005Number of nuclei produced and activity, if 1015 protons (W) & 1 g

  18. Isotopic composition of enriched Ge (by V.P.Kovach, Svetlana)

  19. LAL, Orsay IDEA meeting 14-15.04.2005About isotopic composition of the 76Ge target Enrichment of 76Ge-sample – 99.82% (to avoid 70Ge influence): 74Ge < 0.12%; 73Ge < 0.03%; 72Ge < 0.02%; 70Ge < 0.01% GERDA: 76Ge = 88.2%,74Ge = 11.8%; 73Ge = 0.095%; 72Ge < 0.01%;70Ge < 0.01%

  20. LAL, Orsay IDEA meeting 14-15.04.2005Scheme of Ge-68 decaytot ~ 0.03* det~ 0.0006 bkg = 1 - 100 d-1

  21. LAL, Orsay IDEA meeting 14-15.04.2005Scheme of Co-60 decaytot ~ 2* det~ 0.04 bkg = 1 - 100 d-1

  22. LAL, Orsay IDEA meeting 14-15.04.2005Time to get 100 pulseswith HPGe measurement, days

  23. LAL, Orsay IDEA meeting 14-15.04.2005Experiment’s uncertainties

  24. LAL, Orsay IDEA meeting 14-15.04.2005CONCLUSION In ITEP: a)Accelerator + experimental site with certified neutrons flux (for Ep = 800 MeV) b) Titarenko’ group involved in transmutation of long-lived SNF isotopes. In the framework of the project will be done: 1. Verification of different models and codes. Selection of adequate one. 2. Estimation of the excitation functions. 3. Determination of production rate of the reactions (for En < 800 MeV). Estimationof total production rates. 4. Total uncertainty of the experiment ~ 30%.

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