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