304 research outputs found
New Reversal Mode in Exchange Coupled Antiferromagnetic/Ferromagnetic Disks: Distorted Viscous Vortex
Magnetic vortices have generated intense interest in recent years due to
their unique reversal mechanisms, fascinating topological properties, and
exciting potential applications. Additionally, the exchange coupling of
magnetic vortices to antiferromagnets has also been shown to lead to a range of
novel phenomena and functionalities. Here we report a new magnetization
reversal mode of magnetic vortices in exchange coupled Ir20Mn80/Fe20Ni80
microdots: distorted viscous vortex reversal. Contrary to the previously known
or proposed reversal modes, the vortex is distorted close to the interface and
viscously dragged due to the uncompensated spins of a thin antiferromagnet,
which leads to unexpected asymmetries in the annihilation and nucleation
fields. These results provide a deeper understanding of the physics of exchange
coupled vortices and may also have important implications for applications
involving exchange coupled nanostructures.Comment: 27 pages, 4 figures and a supplemental information sectio
Neutron flux and spectrum in the Dresden Felsenkeller underground facility studied by moderated He counters
Ambient neutrons may cause significant background for underground
experiments. Therefore, it is necessary to investigate their flux and energy
spectrum in order to devise a proper shielding. Here, two sets of altogether
ten moderated He neutron counters are used for a detailed study of the
ambient neutron background in tunnel IV of the Felsenkeller facility,
underground below 45 meters of rock in Dresden/Germany. One of the moderators
is lined with lead and thus sensitive to neutrons of energies higher than 10
MeV. For each He counter-moderator assembly, the energy dependent neutron
sensitivity was calculated with the FLUKA code. The count rates of the ten
detectors were then fitted with the MAXED and GRAVEL packages. As a result,
both the neutron energy spectrum from 10 MeV to 300 MeV and the flux
integrated over the same energy range were determined experimentally.
The data show that at a given depth, both the flux and the spectrum vary
significantly depending on local conditions. Energy integrated fluxes of , , and cm
s, respectively, are measured for three sites within Felsenkeller tunnel
IV which have similar muon flux but different shielding wall configurations.
The integrated neutron flux data and the obtained spectra for the three sites
are matched reasonably well by FLUKA Monte Carlo calculations that are based on
the known muon flux and composition of the measurement room walls.Comment: 10 figures, 4 tables; to be published in Phys. Rev.
First results from the HENSA/ANAIS collaboration at the Canfranc Underground Laboratory
The HENSA/ANAIS collaboration aims for the precise determination of the neutron flux that could affect ANAIS-112, an experiment looking for the dark matter annual modulation using NaI(Tl) scintillators. In this work, the first measurements of the neutron flux and Monte Carlo simulations of the neutron spectrum are reported.Peer ReviewedPostprint (published version
Total Absorption Spectroscopy Study of Rb Decay: A Major Contributor to Reactor Antineutrino Spectrum Shape
The antineutrino spectra measured in recent experiments at reactors are
inconsistent with calculations based on the conversion of integral beta spectra
recorded at the ILL reactor. Rb makes the dominant contribution to the
reactor spectrum in the 5-8 MeV range but its decay properties are in question.
We have studied Rb decay with total absorption spectroscopy. Previously
unobserved beta feeding was seen in the 4.5-5.5 region and the GS to GS feeding
was found to be 87.5(25)%. The impact on the reactor antineutrino spectra
calculated with the summation method is shown and discussed.Comment: 6 pages, 3 figure
A new reversal mode in exchange coupled antiferromagnetic/ferromagnetic disks: distorted viscous vortex
Magnetic vortices have generated intense interest in recent years due to their unique reversal mecha-nisms, fascinating topological properties, and exciting potential applications. In addition, the exchangecoupling of magnetic vortices to antiferromagnets has also been shown to lead to a range of novelphenomena and functionalities. Here we report a new magnetization reversal mode of magnetic vorticesin exchange coupled Ir20Mn80/Fe20Ni80microdots: distorted viscous vortex reversal. In contrast to thepreviously known or proposed reversal modes, the vortex is distorted close to the interface and viscouslydragged due to the uncompensated spins of a thin antiferromagnet, which leads to unexpected asymme-tries in the annihilation and nucleationfields. These results provide a deeper understanding of the physicsof exchange coupled vortices and may also have important implications for applications involvingexchange coupled nanostructure
Segmented YSO scintillation detectors as a new β-implant detection tool for decay spectroscopy in fragmentation facilities
A newly developed segmented YSO scintillator detector was implemented for the first time at the RI-beam Factory at RIKEN Nishina Center as an implantation-decay counter. The results from the experiment demonstrate that the detector is a viable alternative to conventional silicon-strip detectors with its good timing resolution and high detection efficiency for β particles. A Position-Sensitive Photo-Multiplier Tube (PSPMT) is coupled with a 48 × 48 segmented YSO crystal. To demonstrate its capabilities, a known short-lived isomer in Ni and the β decay of Co were measured by implanting those ions into the YSO detector. The half-lives and γ-rays observed in this work are consistent with the known values. The β-ray detection efficiency is more than 80 % for the decay of Co.The present experiment was carried out at the RI Beam Factory operated by RIKEN Nishina Center, RIKEN and CNS, University of Tokyo. This research was supported in part by the Offce of Nuclear Physics, U.S. Department of Energy under Award No. DE-FG02-96ER40983 (UTK)
Measurement of the neutron flux at the Canfranc Underground Laboratory with HENSA
We have performed a long-term measurement of the neutron flux with the High
Efficiency Neutron Spectrometry Array HENSA in the Hall A of the Canfranc
Underground Laboratory. The Hall A measurement campaign lasted from October
2019 to March 2021, demonstrating an excellent stability of the HENSA setup.
Preliminary results on the neutron flux from this campaign are presented for
the first time. In Phase 1 (113 live days) a total neutron flux of 1.66(2)
10 cm s is obtained. Our results are in good
agreement with those from our previous shorter measurement where a reduced
experimental setup was employed.Comment: Proceedings of the 17th International Conference on Topics in
Astroparticle and Underground Physics (TAUP 2021
Long-term evolution of the neutron rate at the Canfranc Underground Laboratory
We report results on the long-term variation of the neutron counting rate at
the Canfranc Underground Laboratory, of importance for several low-background
experiments installed there, including rare-event searches. The measurement
campaign was performed employing the High Efficiency Neutron Spectrometry Array
(HENSA) mounted in Hall A and lasted 412 live days. The present study is the
first long-term measurement of the neutron rate with sensitivity over a wide
range of neutron energies (from thermal up to 0.1 GeV and beyond) performed in
any underground laboratory so far. Data on the environmental variables inside
the experimental hall (radon concentration, air temperature, air pressure and
humidity) were also acquired during all the measurement campaign. We have
investigated for the first time the evolution of the neutron rate for different
energies of the neutrons and its correlation with the ambient variables.Comment: 12 pages, 5 figures, 2 table
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