Fachbereich Energietechnik
Refine
Year of publication
Institute
- Fachbereich Energietechnik (1160)
- Nowum-Energy (65)
- Solar-Institut Jülich (43)
- INB - Institut für Nano- und Biotechnologien (26)
- ECSM European Center for Sustainable Mobility (18)
- Kommission für Forschung und Entwicklung (14)
- Fachbereich Medizintechnik und Technomathematik (11)
- Fachbereich Chemie und Biotechnologie (9)
- Fachbereich Bauingenieurwesen (8)
- Fachbereich Elektrotechnik und Informationstechnik (4)
Language
- English (623)
- German (533)
- Multiple languages (2)
- Dutch (1)
- Spanish (1)
Document Type
- Article (616)
- Conference Proceeding (291)
- Book (126)
- Part of a Book (84)
- Doctoral Thesis (10)
- Conference: Meeting Abstract (8)
- Report (7)
- Conference Poster (5)
- Other (4)
- Talk (3)
Keywords
- Blitzschutz (19)
- Lightning protection (11)
- Earthquake (8)
- Out-of-plane load (5)
- Seismic loading (5)
- Diversity Management (4)
- Energy storage (4)
- In-plane (4)
- In-plane load (4)
- Power plants (4)
Ion optical calculations for a storage ring at the present GSI facility for direct proton-induced reactions relevant for different astrophysical processes are presented. As an example case, the ⁵⁹Cu(p,γ) and ⁵⁹Cu(p,α) reactions are shown. The branching of these two reactions is important in X-ray burst scenarios, since it determines the breakout out of the major ⁵⁶Ni waiting point.
The ²³Al(p, γ)²⁴Si stellar reaction rate has a significant impact on the light-curve emitted in X-ray bursts. Theoretical calculations show that the reaction rate is mainly determined by the properties of direct capture as well as low-lying 2⁺ states and a possible 4⁺ state in ²⁴Si. Currently, there is little experimental information on the properties of these states.
In this proceeding we will present a new experimental study to investigate this reaction, using the surrogate reaction ²³Al(d,n) at 47 AMeV at the National Superconducting Cyclotron Laboratory (NSCL). We will discuss our new experimental setup which allows us to use full kinematics employing the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA) to detect the γ-rays following the de-excitation of excited states of the reaction products and the Low Energy Neutron Detector Array (LENDA) to detect the recoiling neutrons. The S800 was used for identification of the ²⁴Si recoils. As a proof of principle to show the feasibility of this concept the Q-value spectrum of ²²Mg(d,n)²³Al is reconstructed.
We measured the Coulomb dissociation of ¹⁶O into ⁴He and ¹²C within the FAIR Phase-0 program at GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, Germany. From this we will extract the photon dissociation cross section ¹⁶O(α,γ)¹²C, which is the time reversed reaction to ¹²C(α,γ)¹⁶O. With this indirect method, we aim to improve on the accuracy of the experimental data at lower energies than measured so far.
The expected low cross section for the Coulomb dissociation reaction and close magnetic rigidity of beam and fragments demand a high precision measurement. Hence, new detector systems were built and radical changes to the R³B setup were necessary to cope with the high-intensity ¹⁶O beam. All tracking detectors were designed to let the unreacted ¹⁶O ions pass, while detecting the ¹²C and ⁴He.
The neutron activation method is well-suited to investigate neutron-capture cross sections relevant for the main s-process component. Neutrons can be produced via the ⁷Li(p,n) reaction with proton energies of 1912 keV at e.g. Van de Graaff accelerators, which results in a quasi-Maxwellian spectrum of neutrons corresponding to a temperature of kBT = 25 keV. However, the weak s-process takes place in massive stars at temperatures between 25 and 90 keV. Simulations using the PINO code [2] suggest that a Maxwellian spectrum for higher energies, e.g. kBT = 90 keV, can be approximated by a linear combination of different neutron spectra. To validate the PINO code at proton energies Ep ≠ 1912 keV, neutron time-of-flight measurements were carried out at the PTB Ion Accelerator Facility (PIAF) at the Physikalisch-Technische Bundesanstalt in Braunschweig, Germany.
The huge neutron fluxes offer the possibility to use research reactors to produce isotopes of interest, which can be investigated afterwards. An example is the half-lives of long-lived isotopes like 129I. A direct usage of reactor neutrons in the astrophysical energy regime is only possible, if the corresponding ions are not at rest in the laboratory frame. The combination of an ion storage ring with a reactor and a neutron guide could open the path to direct measurements of neutron-induced cross sections on short-lived radioactive isotopes in the astrophysically interesting energy regime.
The High Brilliance neutron Source (HBS) project pioneers a High-Current Accelerator-Based Neutron Source (HiCANS), optimizing elements for tailored neutron production. HBS adapts pulse structure and moderators to instrument requirements, focusing on the Target-Moderator-Reflector (TMR) system. Recognizing the need for multiple channels, Monte Carlo simulations are used to compare different models’ influence on neutron brilliance and beam divergence.
