Data on the production of antiprotons at an angle of 40° in the laboratory system in collisions of 50-GeV protons with C, Al, Cu, and W nuclear targets have been obtained in the SPIN experiment ...(IHEP, Protvino, Russia). Invariant cross sections have been measured at transverse momenta up to
p
T
≈ 2.6 GeV/
c
. The an-alysis of the momentum spectra has shown that multinucleon (multiquark) configurations inside a nucleus are involved in the production of antiprotons.
We have determined the primary jet fuel performance properties that have the greatest impact on how effectively they can be used in diesel engines, requiring improvement with the help of functional ...additives. We have studied the effect of a cetane improver additive based on 2-ethylhexyl nitrate and an antiwear additive based on higher carboxylic acids on the performance properties of jet fuels when they are used in diesel engines, and we have optimized their composition. We present the results of a study of the proposed fuel compositions based on jet fuel and functional additives, using laboratory and qualification methods and indicator properties for the D-245.125 engine cycle.
The SPIN experiment is carried out with the aim of studying inclusive production of charged particles with high transverse momenta in hard proton−nucleus and nucleus−nucleus interactions. A ...single-arm narrow-aperture spectrometer is used in the study. The uniqueness of the experiment is in the high intensity of the proton (10
12
−10
13
protons/s) and ion (of the order of 5 × 10
9
ions/s) beams ejected from the U-70 accelerator, which makes it possible to measure inclusive cross sections varying by seven orders of magnitude. The SPIN setup is able to detect particles with momenta in a kinematic domain of nucleon−nucleon interactions as well as beyond its limits. The spectrometer equipment and the features of the measurement procedure are described.
Data on the production of positively charged particles emitted at an angle of 40
(in the laboratory frame) with transverse momenta of up to 2.7 GeV
in the interaction of 50-GeV
protons with carbon, ...aluminum, copper, and tungsten nuclear targets are presented. Particular attention is given to studying the production of light nuclear fragments, such as deuterons (
) and tritons (
). An analysis of data on
and
particles gives grounds to state that these fragments arise via a local mechanism of their direct knockout from nuclei. The results were obtained in the SPIN experiment at the Institute for High Energy Physics (IHEP, Protvino).
The first data on the yield of the lightest nuclear fragments (protons
p
, deuterons
d
, and tritons
t
) with high transverse momenta
p
T
at an angle of 40° in the laboratory reference frame from ...nuclear targets bombarded by 50-GeV/
c
protons and 20A-GeV/
c
carbon nuclei obtained in the SPIN experiment (IHEP, Protvino, Russia) have been reported. It has been shown that the
pA
and C
A
data can be described within a common scaling approach, which possibly indicates that the mechanism of formation of high-
p
T
nuclear fragments is common for these reactions.
High-rate glass MRPC for fixed target experiments at Nuclotron Kuzmin, N.A.; Ladygin, E.A.; Ladygin, V.P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2019, Letnik:
916
Journal Article
Recenzirano
A Multi-gap Resistive Plate Chamber (MRPC) equipped with heaters to improve the counting rate capability was designed for the BM@N experiment in Dubna. The measurements were performed using a muon ...beam at IHEP U-70 accelerator in Protvino. The MRPC at 40°C tolerates counting rate up to 6 kHz/cm2 with time resolution ∼65 ps and efficiency ∼95% which complies with the conditions of the experiment.
The yields of cumulative protons and π
±
mesons emitted at a laboratory angle of 40° from carbon and heavier nuclear targets irradiated by a proton beam from the U70 accelerator (Institute for High ...Energy Physics, Protvino) have been studied in the SPIN experiment. It has been found that the effect of the target nucleus on the yield of particles with large transverse momenta is weakened.
Formation of the
d
and
t
cumulative light nuclear fragments emitted from the nucleus with large transverse momenta at an angle of 35° in the laboratory frame is investigated. The data on collisions ...of 50-GeV protons with the C, Al, Cu, and W nuclei are collected using the extracted proton beam of the IHEP accelerator and the SPIN detector. The results indicate that the dominant contribution to formation of nuclear fragments comes from the local process of direct knockout from the nucleus.
Studies on the steering of particle beams using channeling in aligned bent crystals have been performed at IHEP for many years. Different types of extraction schemes with bent crystals and technical ...equipment have been developed for experiments to test new crystal devices and to study beam collimation processes. A special apparatus has been designed to control the crystal extraction system. In this article, we describe the crystal devices and in-vacuum goniometers, the beam diagnostic tools (intensity and profile measurements), and the beam feedback system.
PDF
