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).
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.
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.
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.
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.
A new design of highly granular hadronic calorimeter using Glass Resistive Plate Chambers (GRPCs) with embedded electronics has been proposed for the future International Linear Collider (ILC) ...experiments. It features a 2-bit threshold semi-digital read-out. Several GRPC prototypes with their electronics have been successfully built and tested in pion beams. The design of these detectors is presented along with the test results on efficiency, pad multiplicity, stability and reproducibility.
We report on double-differential inclusive cross sections of the production of secondary protons, charged pions, and deuterons, in the interactions with a 5%
λ
abs
thick stationary tantalum target, ...of proton and pion beams with momentum from ±3 GeV/
c
to ±15 GeV/
c
. Results are given for secondary particles with production angles 20°<
θ
<125°. They are of particular relevance for the optimization of the design parameters of the proton driver of a neutrino factory.
The HARP Resistive Plate Chamber (RPC) system was designed for time-of-flight measurement in the large-angle acceptance region of the HARP spectrometer. It comprised 46 four-gap glass RPCs covering ...an area of
∼
8
m
2
. The design of the RPCs, their operation, intrinsic properties, and system performance are described. The intrinsic time resolution of the RPCs is better than 130
ps leading to a system time resolution of
∼
175
ps.
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