While the international nEDM collaboration at the Paul Scherrer Institut (PSI) took data in 2017 that covered a considerable fraction of the parameter space of claimed potential signals of ...hypothetical neutron (n) to mirror-neutron (n′) transitions, it could not test all claimed signal regions at various mirror magnetic fields. Therefore, a new study of n−n′ oscillations using stored ultracold neutrons (UCNs) is underway at PSI, considerably expanding the reach in parameter space of mirror magnetic fields (B′) and oscillation time constants (τnn′). The new apparatus is designed to test for the anomalous loss of stored ultracold neutrons as a function of an applied magnetic field. The experiment is distinguished from its predecessors by its very large storage vessel (1.47 m3), enhancing its statistical sensitivity. In a test experiment in 2020 we have demonstrated the capabilities of our apparatus. However, the full analysis of our recent data is still pending. Based on already demonstrated performance, we will reach sensitivity to oscillation times τnn′/cos(β) well above a hundred seconds, with β being the angle between B′ and the applied magnetic field B. The scan of B will allow the finding or the comprehensive exclusion of potential signals reported in the analysis of previous experiments and suggested to be consistent with neutron to mirror-neutron oscillations.
In nuclear spectroscopy by crystal diffraction, peak sharpness and low count rate make the jitter of the goniometer angle a limit to resolution. A device that uses the photon detection to trigger the ...reading of the angle allows information to be preserved, notwithstanding noise. A Bayesian analysis is applied to estimate the centre of the diffraction peak, without binning the recorded angles.
Pair production was first observed in 1932, which led to two early Nobel prizes in physics, to Carl Anderson for the discovery of positrons (1936) and to Paul Dirac for the theory of anti particles ...(1933). Science textbooks state that the production of electron-positron pairs is possible at photon energies above 1.022 MeV, which is the sum of the rest masses of the particles involved. Measurements at the threshold require a selectable photon energy in the range above 1 MeV, high-energy resolution to scan the onset, and high intensities. Due to the need of simultaneous energy and momentum conservation, pair production needs a recoiling particle, and thus it can be observed most easily in solid matter. More exactly, the minimum energy required for pair production is given by the relation E
γ
≥ 2 m
e
c
2
(1 + m
e
/m
r
), where m
r
is the mass of the recoiling particle
1
. With the particle rest energy of m
e
= 511 keV/c
2
, in heavy atoms we get m
r
>> m
e
, and thus in a good approximation photon energies E
γ
≥ 2·m
e
c
2
= 1.022 keV allow the creation of electron-positron pairs. However, for a proton as recoil particle the calculated threshold energy is increased by 557 eV, for a copper target by 9 eV, and even for the very heavy element
111
Roentgenium by about 2.1 eV. Thus pair production cannot take place at exactly 2ám
e
c
2
.
Social anxiety disorders (SAD) are among the most prevalent mental disorders (lifetime prevalence: 7–12%), with high impact on the life of an affected social system and its individual social system ...members. We developed a manualized disorder-specific integrative systemic and family therapy (ISFT) for SAD, and evaluated its feasibility in a pilot randomized controlled trial (RCT). The ISFT is inspired by Helm Stierlin’s concept of related individuation developed during the early 1980s, which has since continued to be refined. It integrates solution-focused language, social network diagnostics, and genogram work, as well as resource- and problem orientation for both case conceptualization and therapy planning. Post-Milan symptom prescription to fluidize the presented symptoms is one of the core interventions in the ISFT. Theoretically, the IFST is grounded in radical constructivism and “Cybern-Ethics,” multi-directional partiality, and a both/and attitude toward a disorder-specific vs. non-disorder-specific therapy approach. SAD is understood from the viewpoint of social systems theory, especially in adaptation to a socio-psycho-biological explanatory model of social anxiety. In a prospective multicenter, assessor-blind pilot RCT, we included 38 clients with SAD (ICD F40.1; Liebowitz Social Anxiety Scale, LSAS-SR > 30): 18 patients participated in the ISFT, and 20 patients in Cognitive Behavioral Therapy (CBT; age:
M
= 36 years,
SD
= 14). Within-group, simple-effect intention-to-treat analyses showed significant reduction in social anxiety (LSAS-SR; ISFT:
d
= 1.67; CBT:
d
= 1.04), while intention-to-treat mixed-design ANOVA demonstrated the advantage of ISFT (
d
= 0.81). Per-protocol analyses supported these results. The remission rate based on blind diagnosticians’ ratings was good to satisfactory (Structured Clinical Interview, SCID; 78% in ST, 45% in CBT,
p
= 0.083); this has yet to be verified in a subsequent confirmatory RCT. The article will present the ISFT rationale and manual, including a special focus on multi-person settings, and the central findings from our pilot RCT.
To provide a public infrastructure for wireless power transfer (WPT) of electrical vehicles, the ability of interoperable use between infrastructure and vehicles of different manufacturers is ...necessary. For that reason a Wireless interoperable Power Transfer (WiPT) definition has been conceived and developed for pilot field operation. Due to its ability of interoperable use and being inherently safe, the IEC 61980-3 (TS) Annex AA 3 uses this concept for public under floor installations. One of the main features of WiPT is the wide ranging flexibility for the design of vehicle pads. The concept of reaching this feature and corresponding secondary device design procedures are described.
PDF
