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31.
N. A. Baas D. V. Fedorov A. S. Jensen K. Riisager A. G. Volosniev N. T. Zinner 《Physics of Atomic Nuclei》2014,77(3):336-343
We consider few-body bound state systems and provide precise definitions of Borromean and Brunnian systems. The initial concepts are more than a hundred years old and originated in mathematical knot-theory as purely geometric considerations. About thirty years ago they were generalized and applied to the binding of systems in nature. It now appears that recent generalization to higher-order Brunnian structures may potentially be realized as laboratory-made or naturally occurring systems. With the binding energy as measure, we discuss possibilities of physical realization in nuclei, cold atoms, and condensedmatter systems. Appearance is not excluded. However, both the form and the strengths of the interactions must be rather special. The most promising subfields for present searches would be in cold atoms because of external control of effective interactions, or perhaps in condensed-matter systems with nonlocal interactions. In nuclei, it would only be by sheer luck due to a lack of tunability. 相似文献
32.
Fröhlich C Martínez-Pinedo G Liebendörfer M Thielemann FK Bravo E Hix WR Langanke K Zinner NT 《Physical review letters》2006,96(14):142502
We present a new nucleosynthesis process that we denote as the nu p process, which occurs in supernovae (and possibly gamma-ray bursts) when strong neutrino fluxes create proton-rich ejecta. In this process, antineutrino absorptions in the proton-rich environment produce neutrons that are immediately captured by neutron-deficient nuclei. This allows for the nucleosynthesis of nuclei with mass numbers A>64, , making this process a possible candidate to explain the origin of the solar abundances of (92,94)Mo and (96,98)Ru. This process also offers a natural explanation for the large abundance of Sr seen in a hyper-metal-poor star. 相似文献
33.
Stability of a fully polarized ultracold Fermi gas near zero-crossing of a p-wave Feshbach resonance
N. T. Zinner 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2010,57(2):235-240
We consider a fully polarized ultracold Fermi gas interacting through a p-wave Feshbach resonance. Using a two-channel model,
we find the effective potential at the point where the p-wave scattering length goes to zero. Here the effective interaction
provides attraction and one can therefore ask about the stability of the system. We calculate the energy density of the system
in the Thomas-Fermi approximation, determine the profile of the gas, and the critical number of particle in the system as
function of the relevant interaction parameters. The instability can be inferred from a simple breathing mode argument which
explains the scaling found numerically. The critical particle number turns out to be extremely large unless the external confinement
is very tight. We therefore conclude that the effect is insignificant for standard trapping potentials and
that the magnetic dipole interaction is the important term at zero scattering length. However, for tight confinement as in
an optical lattice higher-order corrections can become important. 相似文献
34.
N. T. Zinner 《Few-Body Systems》2013,54(5-6):597-603
Near a Feshbach resonance, the two-body scattering length can assume any value. When it approaches zero, the next-order term given by the effective range is known to diverge. We consider the question of whether this divergence (and the vanishing of the scattering length) is accompanied by an anomalous solution of the three-boson Schrödinger equation similar to the one found at infinite scattering length by Efimov. Within a simple zero-range model, we find no such solutions, and conclude that higher-order terms do not support Efimov physics. 相似文献
35.
Alfons Völkl Dagobert Achatz Friedrich Schoder Gerhard Zinner Heribert Stolzenberg Wolfgang Beck Wolf Peter Fehlhammer Prof. Dr. 《无机化学与普通化学杂志》2010,636(7):1339-1346
1,3‐Dipoles of the type metallo nitrile ylide and metallo nitrile imine were prepared by mono‐α‐deprotonation of CH‐acidic {[W(CO)5CHCH2PPh3]PF6, M(CO)5CNCH2CO2R (M = Cr, W; R = Me, Et), [Pt(Cl)(CNCH2CO2Et)(PPh3)2]BF4} and NH‐acidic isocyanide complexes (Cr(CO)5CNNH2) and were stabilized by coordination to a second transition metal complex fragment {Cr(CO)5, [M(CO)5]+ (M = Mn, Re), [FeCp(CO)2]+, [Pt(Cl)(PR3)2]+ (R = Et, Ph)}. All dinuclear products 1 – 7 , 10 , and 11 are neutral species except [(Ph3P)2(Cl)Pt{μ2‐CNCH(CO2Et)}Pt(Cl)(PPh3)2]BF4 ( 8 ). Complex (OC)5W{μ2‐CNCH(CO2Et)}Pt(Cl)(PEt3)2 ( 5b ) was characterized by X‐ray diffraction. Twofold deprotonation/platination to give (OC)5Cr{μ3‐CNC(Ph)}[Pt(Cl)(PPh3)2]2 ( 9 ) was achieved in the case of Cr(CO)5CNCH2Ph. 相似文献
36.
37.
Image-based phenotypic screening relies on the extraction of multivariate information from cells cultured under a large variety of conditions. Technical advances in high-throughput microscopy enable screening in increasingly complex and biologically relevant model systems. To this end, organoids hold great potential for high-content screening because they recapitulate many aspects of parent tissues and can be derived from patient material. However, screening is substantially more difficult in organoids than in classical cell lines from both technical and analytical standpoints. In this review, we present an overview of studies employing organoids for screening applications. We discuss the promises and challenges of small-molecule treatments in organoids and give practical advice on designing, running, and analyzing high-content organoid-based phenotypic screens.Subject terms: High-throughput screening, Drug delivery 相似文献
38.
The microstructure of the hardened common hot-work tool steel X38CrMoV5-1 has been characterized by atom probe tomography with the focus on the carbon distribution. Samples quenched with technically relevant cooling parameters λ from 0.1 (30 K/s) to 12 (0.25 K/s) have been investigated. The parameter λ is an industrially commonly used exponential cooling parameter, representing the cooling time from 800 to 500 °C in seconds divided with hundred. In all samples pronounced carbon segregation to dislocations and cluster formation could be observed after quenching. Carbon enriched interlath films with peak carbon levels of 6-10 at.%, which have been identified to be retained austenite by TEM, show a thickness increase with increasing λ. Therefore, the fraction of total carbon staying in the austenite grows. This carbon is not available for the tempering induced precipitation of secondary carbides in the bulk. Through all samples no segregation of any substitutional elements takes place. Charpy impact testing and fracture surface analysis of the hardened samples reveal the cooling rate induced microstructural distinctions. 相似文献
39.
40.
We consider dipolar interactions between heteronuclear molecules in a low-dimensional setup consisting of two one-dimensional tubes. We demonstrate that attraction between molecules in different tubes can overcome intratube repulsion and complexes with several molecules in the same tube are stable. In situ detection schemes of the few-body complexes are proposed. We discuss extensions to many tubes and layers, and outline the implications on many-body physics. 相似文献