Stefan Lunkenheimer MAGIXCollaboration Institute for Nuclear Physics Johannes

Stefan Lunkenheimer - MAGIX-Collaboration Institute for Nuclear Physics – Johannes Gutenberg University Mainz SFB School – Boppard – October 23, 2019

Topics MAGIX@MESA Feasibility Studies Summary/Outlook 2

MAGIX@MESA 3

Mainz Energy-Recovering Superconducting Accelerator Energy Recovery Linac (ERL) Mode Dark MESA • • • am du • Parasitic Experiment • Search for Dark Matter • Talk Manuel Mauch mp be Extracted Beam (EB) Mode • • • 4

Mainz Energy-Recovering Superconducting Accelerator Injector 5 Me. V MAMBO MELBA Source 100 ke. V +25 Me. V MAGIX dump MAGIX Cryomodule 1 Recirculation arcs 2 -4 P 2 Recirculation arcs 1 -3 -5 155 Me. V dump +25 Me. V Cryomodule 2 5

Mes. A Gas Internal target e. Xperiment - MAGIX Internal Gas-Target • Low energy high precision electron scattering • Different gas types possible Spectrometer 3. 7 m • • Thin Target - High Beam Current • Physics • e. -m. form factor measurements • Search for messenger particles of the dark sector • Reaction studies of astrophysical relevance • Few Body reactions • . . . 6

Jet-Target Laval Nozzle Gas-Jet Catcher group of Alfons Khoukaz Gas-Jet • • • Three stages of cooling • Precooling (Booster) • 1 st main stage: down to 28 K • 2 nd main stage: down to 8 K 7

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Helium Burning in Red Giants • Descripe Further Burning states • Nucleosynthesis in massive stars 9

Gamow-Peak Maxwell-Boltzmann distribution • • Coulomb penetration factor • • Gamow-Peak • Cp. Marialuisa Aliotta: Exotic beam studies in Nuclear Astrophyiscs 10

• • Gamow-Peak • 11

Measurement of S-Factor • • • 12

Cross Section Measurement • • • Motivation • Cp. Simulation of Ugalde 2013 13

Feasibility Studies 14

Feasibility Studies at MAGIX@MESA Experimental Setup • • Suppress background • Determine ��-particle angular distribution 15

Feasibility Studies at MAGIX@MESA Experimental Setup • • • Suppress background • Determine ��-particle angular distribution 16

Time Reversal Factor Time Revearsed Reaction • • Cp. Mayer-Kuckuk Kernphysik: Chapter 7. 3 17

Simulation – General Setup Spectrometer • • • Oxygen Gas-Jet • • Parameters Interactionpoint • • • 18

Phase 1 – MAGIX@MAMI • • The goal • • 19

Phase 2 – MAGIX@MESA Simulation E 1 Setup • • • Result • • • 20

How to improve this result Increase cross section • Modify Parameters • • 21

Phase 3 – Zero Degree Tagger ERL Mode Integrated Tagger • • • Tagger Design • • • 22

Phase 3 – Simulation of Zero Degree Tagger E 1 Setup • • Zero-Degree Tagger • • Result • 23

Summary/Outlook 24

Summary / Outlook • • MAGIX² • • • MAGIX³ • • 25

THANK YOU FOR YOUR ATTENTION! http: //magix. kph. uni-mainz. de

BACKUP 27

MAGIX - Spectrometers Spectrometer • • Time Projection Chamber • Minimal radiation thickness • Tracking multiple trace points -> 5(multiplicities) x 20(rows) Trigger-System Vacuum foil Focal plane (horizontal) • Trigger, Timing and PID purposes • 4 active segmented scintillator layers • Lead shield in between 28

Time Projection Chamber Working principle • Particle transits active volume • Ionisation • Electrons drift along the Efield to readout • GEMs amplify the electrons 3 D track reconstruction • X and Y component in readout plane • Z component with drift time 29

Trigger-System Trigger and Veto-System • Electrons and muons point in the same direction • Beam induced neutrons • Different particles have different detector signatures 30

MAMI and MESA at KPH Mainz MAMI • Electron Accelerator • Operating since >25 years • Up to 1508 Me. V@100 µA Physics • Electron scattering • Real photos • X-Ray radiation MESA • Build in the existing facility + Extension for MESA halls 36

Timeline for MESA Construction • Construction of the extended MESA hall will delay the construction start of the accelerator and experiments to at least 2021. Commissioning • Commissioning of the accelerator is planned to start in 2022 First beam • First beam to experiments can be expected in 2023 F. Hug - GRK 2128 Workshop 2019 – Talk: STATUS of the MESA project 37

Helium Burning in Red Giants Rolfs and Rodney, 1988 38

Differential cross section Cp. de. Boer Cp. I. Friščić et al. A New Approach to Determine Radiative Capture Reaction Rates at Astrophzsical Energies 39