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Underground Astrophysics at Surface Facilities : the Atomki case

Discover the cutting-edge research conducted at the Atomki facility in Debrecen, Hungary, including nuclear reactions, target preparation, and system investigations. This facility plays a crucial role in advancing astrophysics and nuclear research.

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Underground Astrophysics at Surface Facilities : the Atomki case

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  1. Underground Astrophysics at Surface Facilities: the Atomki case Zs. Fülöp ATOMKI, Debrecen,Hungary LUNA Collaboration Germany, Hungary, Italy, UK Whentime, money, manpowermatter: A network of satelliteovergroundlabs is needed

  2. Atomki, Debrecen, Hungary

  3. Lookingformountains…

  4. Before accelerator: deccelerator • 27Al(α,n)30P • First nuclear reaction in Debrecen • CO2 pressure → α-energy

  5. Before accelerator: deccelerator excitationfunctiondetermined withactivationmethod

  6. LUNA history: overground contribution • Same experimental approach at higher energies • Different experimental approach at higher energies • Feasibility studies (target properties) • Auxiliary experiments (half-lives, stopping power)

  7. Atomki: 7% of Hungary’s RI --- 20% of physics RI Strategic Research Infrastructures Allvalidatedbythe NEKIFUT (Hungarian ESFRI) committee Atomkifacilities: • AtomkiAccelerator Centre • AtomkiEnvironmentalLaboratory • AtomkiNuclear and AstrophysicsLaboratory

  8. New Tandetron Laboratory

  9. 17O(p,)18F • Advanced hydrogen burning key reaction • Preliminary results: poster prize at EuNPC, 2015

  10. Target preparation and analysis • evaporation, Atomic Layer Deposition • in situ SNMS-XPS-SPM + µIBA

  11. Low energy 3He(α,γ)7Be activation Activation vs. in beam approach: • Partly independent (irradiation + off-line γ) • Inherent 4π cross section (no angular effects) • Off-line part can be repeated (long half-life) • Well-known background (no beam induced bg) • No summing problems • Cannot reach “low” energy A good tool to investigate systematic errors !!!

  12. Complementary Measurements at ATOMKI Catcher purity investigation overground: possible DH2+ or DD+ parasitic beam along with 6Li or 10B impurity in beam stop: • 6Li(p,)7Be:  = 7.7nb @ EDH2+=233 keV • 6Li(d,n)7Be:  = 1.08mb @ EDH2+=233 keV • 10B(p,)7Be:  = 5.75b @ EDH2+=233 keV  beam and beam stop purity is crucial

  13. OFHC catcher purity • Irradiations by 700 keV p and d at ATOMKI • Analysis of residual activity • 6Li(d,n)7Be cross section → subPPM 6Li concentration

  14. 7Be custom reference source production • Irradiation of LiF targets at ATOMKI • 7Li(p,n)7Be, Ep=2.5 MeV • Thin backings • Protective layer • 50 cps gamma Reference activity: • ISO 9001 ATOMKI • LNGS

  15. Production of 7Be at Atomkivia the 7Li(p,n)7Be nuclear reaction Proton beam Ep = 10.5 MeV; Ip = 18 A magnetically deflected and rotated Irradiation time:tirr = 105 h Produced activity:A = 7x109 Bq Li-target Thickness: d = 2.5 mm Vacuum window foil 21 µm DURATHERM Copper backing He-gas in He-gas out Water in Water out Target cooling: Bombarded surface: He-gas jet (pHe=1.6 bar; T  300 K) Back side of the Cu backing: Water stream

  16. Recent upgrades at the vertical isotope production beam line New target unit for 7Be production New control software New hardware for the control and for the vacuum systems New target cooling systems and pneumatics New electronicsforbeamrotating

  17. LUNA members from Atomki • Z. Elekes • Zs. Fülöp • Gy. Gyürky • E. Somorjai (prof. emeritus) • T. Szücs

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