Nuclear Experiment·nucl-ex
5 papers—3 primary·2 cross-listed·reconstructed*
The existence and location of the QCD critical point is an object of vivid experimental and theoretical studies. Rich and beautiful data recorded by experiments at SPS and RHIC allow for a systematic search for the critical point - the search for a non-monotonic dependence of various correlation and fluctuation observables on collision energy and size of colliding nuclei.
J. Bliss (Institut fur Kernphysik, Technische Universitat Darmstadt, Germany)🇩🇪 · A. Arcones (Institut fur Kernphysik, Technische Universitat Darmstadt, Germany and GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt, Germany)🇩🇪 · F. Montes (National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA and Joint Institute for Nuclear Astrophysics)🇺🇸 · J. Pereira (National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA and Joint Institute for Nuclear Astrophysics)
Neutrino-driven ejecta in core collapse supernovae (CCSNe) offer an interesting astrophysical scenario where lighter heavy elements between Sr and Ag can be synthesized. Previous studies emphasized the important role that () reactions play in the production of these elements, particularly in neutron-rich and alpha-rich environments. In this paper, we have investigated the sensitivity of elemental abundances to specific () reaction-rate uncertainties under different astrophysical conditions. Following a Monte Carlo nucleosynthesis study with over 36 representative astrophysical wind conditions, we have identified the most important reactions based on their impact on the final elemental abundances. Experimental studies of these reactions will reduce the nucleosynthesis uncertainties and make it possible to use observations to understand the origin of lighter heavy elements and the astrophysical conditions where they are formed.
The nucleon form factors provide fundamental knowledge about the strong interaction. We review the flavor composition of the nucleon form factors and focus on an analysis of the possible impact of the s-quark contribution. A future experiment is presented to measure the strange form factor at large momentum transfer.
Jagjit Singh🇯🇵 · J. Casal🇮🇹 · W. Horiuchi🇯🇵 · L. Fortunato🇮🇹 · A. Vitturi🇮🇹
Background The F system is located at the lower-N boundary of the "island of inversion" and is an exotic, weakly bound system. Little is known about this system beyond its two-neutron separation energy () with large uncertainties. A similar situation is found for the low-lying spectrum of its unbound binary subsystem F. Purpose To investigate the configuration mixing, matter radius and neutron-neutron correlations in the ground state of F within a three-body model, exploring the possibility of F to be a two-neutron halo nucleus. Method The F ground-state wave function is built within the hyperspherical formalism by using an analytical transformed harmonic oscillator basis. The Gogny-Pires-Tourreil (GPT) nn interaction with central, spin-orbit and tensor terms is employed in the present calculations, together with different core potentials constrained by the available experimental information on F. Results The F ground-state configuration mixing and its matter radius are computed for different choices of the F structure and value. The admixture of d-waves with pf components are found to play an important role, favoring the dominance of dineutron configurations in the wave function. Our computed radii show a mild sensitivity to the F potential and values. The relative increase of the matter radius with respect to the F core lies in the range 0.1-0.4 fm depending upon these choices. Conclusions Our three-body results for F indicate the presence of a moderate halo structure in its ground state, which is enhanced by larger intruder components. This finding calls for an experimental confirmation.
Marcin Jakubowski · Ralf König · Oliver Schmitz · Yuhe Feng · Maciej Krychowiak · Matthias Otte · Felix Reimold · Andreas Dinklage · Peter Drewelow · Florian Effenberg · Yu Gao · Holger Niemann and 21 other authors
Reduction of particle and heat fluxes to plasma facing components is critical to achieve stable conditions for both the plasma and the plasma material interface in magnetic confinement fusion experiments. A stable and reproducible plasma state in which the heat flux is almost completely removed from the material surfaces was discovered recently in the Wendelstein 7-X stellarator experiment. At the same time also particle fluxes are reduced such that material erosion can be mitigated. Sufficient neutral pressure was reached to maintain stable particle exhaust for density control in this plasma state. This regime could be maintained for up to 28 seconds with a minimum feedback control.
* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.