Post on 27-Jan-2021
Neutron Facilities and Rings
René ReifarthGoethe-Universität Frankfurt
JINA Horizons30 November – 4 December 2020, ONLINE
Charged particle cross section measurements
p-, α-beam (1-10 AMeV)
Isotope of interest
p-, α-beam (1-10 AMeV)
Isotope of interest
Charged particle cross section measurements
Inverse kinematics and recycling = ring
Approaching the Gamow Window with Stored Ions: Direct Measurement of 124Xe(p,γ) in the ESR Storage RingJ. Glorius, C. Langer, Z. Slavkovská, L. Bott, C. Brandau, B. Brückner, K. Blaum, X. Chen, S. Dababneh, T. Davinson, P. Erbacher, S. Fiebiger, T. Gaßner, K. Göbel, M. Groothuis, A. Gumberidze, G. Gyürky, M. Heil, R. Hess, R. Hensch, P. Hillmann, P.-M. Hillenbrand, O. Hinrichs, B. Jurado, T. Kausch, A. Khodaparast, T. Kisselbach, N. Klapper, C. Kozhuharov, D. Kurtulgil, G. Lane, C. Lederer-Woods, M. Lestinsky, S. Litvinov, Yu. A. Litvinov, B. Löher, F. Nolden, N. Petridis, U. Popp, T. Rauscher, M. Reed, R. Reifarth, M. S. Sanjari, D. Savran, H. Simon, U. Spillmann, M. Steck, T. Stöhlker, J. Stumm, A. Surzhykov, T. Szücs, T. T. Nguyen, A. Taremi Zadeh, B. Thomas, S. Yu. Torilov, H. Törnqvist, M. Träger, C. Trageser, S. Trotsenko, L. Varga, M. Volknandt, H. Weick, M. Weigand, C. Wolf, P. J. Woods, Y. M. XingPhys. Rev. Lett. 122, 92701-92706 (2019)
Finally … editor’s choice
Production mechanisms of elements
Data needed for:
Maxwell-Boltzmann energy distributionin stars
Neutron induced reactionsisotopes and energies of interest
Neutron Capturestime-of-flight technique
Reifarth et al., Journal of Physics G 41 (2014) 53101
Data needed for:
Data available / measurement feasible:
Maxwell-Boltzmann energy distributionin stars
Neutron induced reactionsisotopes and energies of interest
Spallation-based neutron target
Spallation-based neutron target
Spallation-based neutron target
- Moderator: 0.5-2m D2O- Spallation target: 10-50 cm W- Protons: 0.5 – 50 GeV
Reifarth et al., Phys. Rev ST Accelerator and Beams 20 (2017) 044701
Possible setup
1m D2O, neutron time in ion pipe
1m D2O, neutron time in ion pipe
1m D2O, neutron time in ion pipe
1m D2O, neutron time in ion pipe
• 800 MeV, 100 µA, 10 cm W, 2 m D2O (LANL, USA):
8 109 n/cm2
• 20 GeV, 0.5 µA, 50 cm W, 2 m D2O (nTOF, CERN):
5 108 n/cm2
• 2 GeV, 0.03 µA, 10 cm W, 2 m D2O (CAVE-C, GSI/FAIR):
6 106 n/cm2
Neutron target densities
Count rate estimate• Protons: 100 μA @ 1 GeV• D2O moderator radius: 2 m• Neutron target: 1010 n/cm2
• Counts per day: 10 σ / mb 237Np(n,γ)
Data needed for:
Measurment feasible:
Maxwell-Boltzmann energy distributionin stars
Neutron induced reactionsisotopes and energies of interest
Summary• Radioactive isotopes become more
and more in reach of current experimental research
• Neutron induced reaction studies are very difficult on unstable nuclei
• A combination of a neutron target and a ion storage ring might open a new era
Foliennummer 1Charged particle cross section measurementsCharged particle cross section measurementsInverse kinematics and recycling = ringFinally … editor’s choiceFoliennummer 6Neutron induced reactions�isotopes and energies of interest Neutron Captures�time-of-flight techniqueNeutron induced reactions�isotopes and energies of interest Spallation-based neutron targetSpallation-based neutron targetSpallation-based neutron targetPossible setup1m D2O, neutron time in ion pipe1m D2O, neutron time in ion pipe1m D2O, neutron time in ion pipe1m D2O, neutron time in ion pipeNeutron target densitiesCount rate estimateNeutron induced reactions�isotopes and energies of interest Summary