199 research outputs found
Importance of the deuteron breakup in the deuteron knockout reaction
An isoscalar pair is expected to emerge in nuclei that have similar
proton and neutron numbers and it may be a candidate for a deuteron
``cluster.'' There is, however, no experimental evidence for it. The purpose of
this paper is to construct a new reaction model for the () reaction
including the deuteron breakup in the elementary process and the deuteron
reformation by the final-state interactions (FSIs). How these processes
contribute to the observables of the reaction is investigated. The distorted
wave impulse approximation is extended in twofold. The elementary processes of
the (), i.e., the - elastic scattering and reaction, are
described with an impulse picture employing a nucleon-nucleon effective
interaction. The three-body scattering waves in the final state of the ()
reaction are calculated with the continuum-discretized coupled-channels method.
The triple differential cross section (TDX) of the () reaction is
calculated with the new model. The elementary processes are described
reasonably well with the present model. As for the () reaction, the
deuteron reformation can either increase or decrease the TDX height depending
on the interference between the elastic and breakup channel of deuteron, while
the \textit{back-coupling} effect always decreases it. It is shown that the
deuteron reformation significantly changes the TDX of the () reaction
through the interference. It is important to include this process to
quantitatively discuss the () cross sections in view of the deuteron
formation in nuclei. For more quantitative discussion regarding the
experimental data, further improvement will be necessary.Comment: 11 pages, 5 figure
Piezoelectric effect and diode effect in anapole and monopole superconductors
Superconductors lacking both inversion symmetry and time-reversal symmetry
have been attracting much attention as a platform for exotic superconducting
phases and anomalous phenomena, including the superconducting diode effect.
Recent studies revealed intrinsic phases with this symmetry, named anapole
superconductivity and monopole superconductivity, which are -symmetric
superconducting states with and without Cooper pairs' total momentum,
respectively. To explore characteristic phenomena in these states, we calculate
and predict the superconducting piezoelectric effect and superconducting diode
effect. A close relationship with the finite- pairing, asymmetric Bogoliubov
spectrum, and quantum geometry is discussed. This study reveals the
piezoelectric and diode effects as potential probes to elucidate exotic
superconducting phases.Comment: 13 pages, 16 figure
Quantum-geometry-induced anapole superconductivity
Anapole superconductivity recently proposed for multiband superconductors
[\href{https://www.nature.com/articles/s42005-022-00804-7}{Commun. Phys. , 39\ (2022)}] is a key feature of time-reversal
()-symmetry-broken polar superconductors. The anapole moment was
shown to arise from the asymmetric Bogoliubov spectrum, which induces a finite
center of mass momenta of Cooper pairs at the zero magnetic field. In this
paper, we show an alternative mechanism of anapole superconductivity: the
quantum geometry induces the anapole moment when the interband pairing and
Berry connection are finite. Thus, the anapole superconductivity is a
ubiquitous feature of -broken multiband polar superconductors.
Applying the theory to a minimal model of UTe, we demonstrate the
quantum-geometry-induced anapole superconductivity. Furthermore, we show the
Bogoliubov Fermi surfaces (BFS) in an anapole superconducting state and predict
an unusual temperature dependence of BFS due to the quantum geometry.
Experimental verification of these phenomena may clarify the superconducting
state in UTe and reveal the ubiquitous importance of quantum geometry in
exotic superconductors.Comment: 13 pages, 6 figure
Percutaneous coronary intervention strategy for acute coronary syndrome caused by spontaneous coronary artery dissection for relieving ongoing ischemia—Case series and literature review
AbstractAlthough spontaneous coronary artery dissection (SCAD) is one of the causes of acute coronary syndrome (ACS) or sudden cardiac death, its standard management, especially primary percutaneous coronary intervention (PCI) in ACS patients with ongoing ischemia, has not been established. We experienced three ACS patients with SCAD who were treated with a different strategy of primary PCI. Each PCI strategy led to different clinical and procedural results. We describe here such PCI strategies and results, and also discuss the literature regarding primary PCI strategies for SCAD-induced ACS patients with ongoing ischemia.<Learning objective: SCAD is a cause of ACS. However, the treatment strategy of primary PCI for SCAD has not been fully investigated. We used different PCI strategies for three SCAD patients with ongoing ischemia. Our case series suggested that plain old balloon angioplasty is an acceptable option to avoid coronary stenting because the majority of patients were young menstruating women. Coronary vasospasm might be associated with SCAD. Treatment with vasodilators could be a potential pharmacological option for avoiding recurrence of SCAD.
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