A
bstract
We present the study of the decay
J/ψ
→
ρπ
. The results are based on of 5.2 million
J/ψ
events collected by the KEDR detector at the VEPP-4M collider. The branching fractions are measured ...to be
B
(
J/ψ
→
ρπ
) = (2
.
072 ± 0
.
017 ± 0
.
062) ∙ 10
−
2
and
B
(
J/ψ
→
π
+
π
−
π
0
) = (1
.
878 ± 0
.
013 ± 0
.
051) ∙ 10
−
2
, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.
•Russian beryllium of TGP-56FW grade has been accepted for the ITER first wall application.•Experimental technology of TGP-56FW grade, has been successfully introduced to the industry.•Further R&D ...will be directed on the cost reduction and increasing the efficiency of production.•Performances of TGP-56FW grade and S-65C grade under ITER-like loads are very similar.
Progress of R&D activities on the development and improvement of manufacturing technology of the billets and tiles made of TGP-56FW beryllium is traced and also some actions aimed on the preparation of mass production is reported. Additionally, the results of comparative study are presented on influence of transient plasma heat loads with the energy density of 0.3–1.0MJ/m2 at 250–500°C (performed in QSPA-Be plasma gun facility), on the erosion and surface damage of beryllium tiles made of TGP-56FW grade (RF) and S-65C grade (USA).
The use of inoculum containing autochthonous compost microorganisms
Bacillus subtilis
,
B. amyloliquefaciens
, and
Pseudomonas aeruginosa
allowed us to enhance biodegradation of food waste during ...composting. The survival rate of the introduced microorganisms was verified by classical microbiological and molecular biological methods. The introduction extended the high-temperature stage by 4 days, prevented acidification of the medium, and increased organic matter degradation and moisture evaporation, resulting in a 51% reduction in waste weight in two weeks. Introduced
P. aeruginosa
appeared to play a key role at the initial stage and was not detected after the temperature increased to 60°C.
The electronic width of the
J
/
ψ
meson and its product by the branching fractions of
J
/
ψ
meson decay to hadrons and electrons measured with the KEDR detector at the VEPP-4M
e
+
e
−
collider have ...been reported in ref. 1.
Measurement of Γee(J/ψ) with KEDR detector Anashin, V. V; Aulchenko, V. M; Baldin, E. M ...
The journal of high energy physics,
05/2018, Volume:
2018, Issue:
5
Journal Article
Peer reviewed
Open access
A
bstract
The product of the electronic width of the
J/ψ
meson and the branching fractions of its decay to hadrons and electrons has been measured using the KEDR detector at the VEPP-4M
e
+
e
−
...collider. The obtained values are
Γ
e
e
J
/
ψ
=
5.550
±
0.056
±
0.089
keV
,
Γ
e
e
J
/
ψ
·
ℬ
hadrons
J
/
ψ
=
4.884
±
0.048
±
0.078
keV
,
Γ
e
e
J
/
ψ
·
ℬ
e
e
J
/
ψ
=
0.3331
±
0.0066
±
0.0040
keV
.
The uncertainties shown are statistical and systematic, respectively. Using the result presented and the world-average value of the electronic branching fraction, one obtains the total width of the
J/ψ
meson:
Γ
=
92.94
±
1.83
keV
.
These results are consistent with the previous experiments.
The effect of carbonaceous materials (e.g., graphite, shungite carbon, and acetylene black) on the properties of composites and coatings based on the Si–B
4
C–ZrB
2
glass-forming system has been ...studied. The results of thermogravimetric and differential thermal analyzes, as well as thermal resistance tests are provided. The phase composition and surface morphology of the coatings were also studied. It is shown that the introduction of carbonaceous additives results in an increase in the vitrified surface area of the coating, thus causing an improved material resistance to high temperatures and other aggressive factors.
Behavior in the open field test was compared in rats of two strains differing in terms of the manifestation of convulsions in response to sound (audiogenic epilepsy (AE)). These strains (“4” and “0”) ...were bred on the basis of a single hybrid population. Testing was performed before a series of exposures to sound (21 days) and after exposure. During sequential presentations of sounds, rats of strain “4” formed myoclonic convulsions, while “0” rats had no AE and, thus, no myoclonic convulsions. In the initial test, the level of locomotion and exploratory activity were greater in “4” rats than in “0” rats. In the second test, “4” rats showed significant changes in many behavioral parameters reflecting general suppression of exploratory activity and locomotion. Rats of strain “0” exposed to sound (but not displaying signs of AE) showed more active behavior in the second test than the first, reflecting acclimation of the animals to the experimental context, though changes in a number of indicators in the second test provided evidence of the complex nature of changes in anxiety levels in these animals (as a result of serial exposure to loud sounds). The similar genetic backgrounds of the two rat strains contrasting in terms of AE leads to the conclusion that changes in the behavior of “4” rats resulted from induction of a series of the epileptiform phenomena of AE. This pair of strains may provide a clear genetic model of convulsive states providing for reliable assessment of the effects of both external actions and pharmacological agents.
Using the 1.32
pb
-
1
statistics collected at the
J
/
ψ
peak with the KEDR detector at the VEPP-4M
e
+
e
-
collider, we measured the branching fractions of
J
/
ψ
meson decays to the final states 2(
π
...+
π
-
)
π
0
,
K
+
K
-
π
+
π
-
π
0
, 2(
π
+
π
-
)
and
K
+
K
-
π
+
π
-
. The results obtained for the decays
J
/
ψ
→
2(
π
+
π
-
)
π
0
,
J
/
ψ
→
K
+
K
-
π
+
π
-
π
0
contradict the measurements performed by other groups in the last century, but agree well with recent results of BABAR and BESIII collaborations.
—
This article discusses the influence of nanosized particles of zirconium dioxide on the properties of a heat-resistant coating synthesized by the suspension annealing of a silicon–boron ...carbide–zirconium diboride composition. The heat resistance of coatings on graphite and high silica ceramic substrates is studied, and the phase composition, morphology, hardness, and electric resistance of the coatings are determined.
A method proposed to preserve the electron beam polarization at the VEPP-4M collider during acceleration with crossing the integer (imperfection) spin resonance at energyE=1763MeVhas been ...successfully applied. It is based on full decompensation of the0.6×3.3Tesla×meterintegral of the KEDR detector longitudinal magnetic field due to the antisolenoid being “switched off.”
PDF
