4,527 research outputs found
The level of somatic health, sports specialization and qualification of an athlete as indicators of intermediate selection in the mixed martial arts
This article presents the results of experimental research to identify high-priority types of martial arts whose representatives successfully implement their skills in mixed martial arts, as well as the results of the study of somatic healt
Mass measurements in the vicinity of the doubly-magic waiting point 56Ni
Masses of 56,57Fe, 53Co^m, 53,56Co, 55,56,57Ni, 57,58Cu, and 59,60Zn have
been determined with the JYFLTRAP Penning trap mass spectrometer at IGISOL with
a precision of dm/m \le 3 x 10^{-8}. The QEC values for 53Co, 55Ni, 56Ni, 57Cu,
58Cu, and 59Zn have been measured directly with a typical precision of better
than 0.7 keV and Coulomb displacement energies have been determined. The Q
values for proton captures on 55Co, 56Ni, 58Cu, and 59Cu have been measured
directly. The precision of the proton-capture Q value for 56Ni(p,gamma)57Cu,
Q(p,gamma) = 689.69(51) keV, crucial for astrophysical rp-process calculations,
has been improved by a factor of 37. The excitation energy of the proton
emitting spin-gap isomer 53Co^m has been measured precisely, Ex = 3174.3(10)
keV, and a Coulomb energy difference of 133.9(10) keV for the 19/2- state has
been obtained. Except for 53Co, the mass values have been adjusted within a
network of 17 frequency ratio measurements between 13 nuclides which allowed
also a determination of the reference masses 55Co, 58Ni, and 59Cu.Comment: 14 pages, 13 figures, submitted to Phys. Rev.
Sub-cycle multidimensional spectroscopy of strongly correlated materials
Strongly correlated solids are extremely complex and fascinating quantum
systems, where new states continue to emerge, especially when interaction with
light triggers interplay between them. In this interplay, sub-laser-cycle
electron response is particularly attractive as a tool for ultrafast
manipulation of matter at PHz scale. Here we introduce a new type of non-linear
multidimensional spectroscopy, which allows us to unravel the sub-cycle
dynamics of strongly correlated systems interacting with few-cycle infrared
pulses and the complex interplay between different correlated states evolving
on the sub-femtosecond time-scale. We demonstrate that single particle
sub-cycle electronic response is extremely sensitive to correlated many-body
dynamics and provides direct access to many body response functions. For the
two-dimensional Hubbard model under the influence of ultra-short, intense
electric field transients, we demonstrate that our approach can resolve
pathways of charge and energy flow between localized and delocalized many-body
states on the sub-cycle time scale and follow the creation of a highly
correlated state surviving after the end of the laser pulse. Our findings open
a way towards a regime of imaging and manipulating strongly correlated
materials at optical rates, beyond the multi-cycle approach employed in Floquet
engineering, with the sub-cycle response being a key tool for accessing many
body phenomena.Comment: 10 pages, 4, figures, Methods (5 pages), Supplementary information (4
figures, 4 pages
Characterization of a Be(p,xn) neutron source for fission yields measurements
We report on measurements performed at The Svedberg Laboratory (TSL) to
characterize a proton-neutron converter for independent fission yield studies
at the IGISOL-JYFLTRAP facility (Jyv\"askyl\"a, Finland). A 30 MeV proton beam
impinged on a 5 mm water-cooled Beryllium target. Two independent experimental
techniques have been used to measure the neutron spectrum: a Time of Flight
(TOF) system used to estimate the high-energy contribution, and a Bonner Sphere
Spectrometer able to provide precise results from thermal energies up to 20
MeV. An overlap between the energy regions covered by the two systems will
permit a cross-check of the results from the different techniques. In this
paper, the measurement and analysis techniques will be presented together with
some preliminary results.Comment: 3 pages, 3 figures, also submitted as proceedings of the
International Conference on Nuclear Data for Science and Technology 201
Q_EC values of the Superallowed beta-Emitters 10-C, 34-Ar, 38-Ca and 46-V
The Q_EC values of the superallowed beta+ emitters 10-C, 34-Ar, 38-Ca and
46-V have been measured with a Penning-trap mass spectrometer to be 3648.12(8),
6061.83(8), 6612.12(7) and 7052.44(10) keV, respectively. All four values are
substantially improved in precision over previous results.Comment: 9 pages, 7 figures, 5 table
Faddeev study of heavy baryon spectroscopy
We investigate the structure of heavy baryons containing a charm or a bottom
quark. We employ a constituent quark model successful in the description of the
baryon-baryon interaction which is consistent with the light baryon spectra. We
solve exactly the three-quark problem by means of the Faddeev method in
momentum space. Heavy baryon spectrum shows a manifest compromise between
perturbative and nonperturbative contributions. The flavor dependence of the
one-gluon exchange is analyzed. We assign quantum numbers to some already
observed resonances and we predict the first radial and orbital excitations of
all states with or 3/2. We combine our results with heavy quark
symmetry and lowest-order SU(3) symmetry breaking to predict the masses and
quantum numbers of six still non-measured ground-state beauty baryons.Comment: 22 pages, 4 figures, 8 tables. Accepted for publication in J. Phys.
Respiratory gymnastics for students with cardiological diseases
Purpose: to give scientific justification to the technique of performing breathing exercises by students with cardiological diseases. It is confirmed the expediency of systematic application of the breathing exercises with a full breath and interval hypoxia. Conclusions: It is expedient to perform breathing exercises on the classes of the subject "Physical culture" with the students suffer from cardiological disease
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