η -nuclei in the SCAN experiment Michaličková, Katarína; Afanasiev, S.V.; Dryablov, D.K. ...
EPJ Web of Conferences,
2019, Volume:
204
Journal Article, Conference Proceeding
Peer reviewed
Open access
η
-mesic nucleus or the quasibound nuclear state of an
η
-meson in a nucleus is caused by the strong-interaction force alone. The project SCAN2 is aimed at searching and studying the
η
-meson nuclei ...production. The experiment is based on two-arms spectrometer using internal target at the Nuclotron. The setup was designed to study products from
η
-meson nucleus decay in the reaction
d
+
12
C → (A)
η
+
X
→
π
+
p
+ (
A –
2) at deuteron energies from 0:5 to 2:5 GeV/nucl. The energy spectrum of secondary protons has been measured. The dependence of the yields of protons and pions on the beam energy has been obtained. This dependence can show us the minimum energy for the
S
11
resonance formation. The first prototype of the neutron detector, which will be used in a new modified experimental setup SCAN3 for recording of neutrons from
η
-nucleus decays in the
πn
and
pn
channels, has been tested. The time-offlight method to obtain the neutron spectrum was used. The time resolution and efficiency of the neutron detector have been obtained.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
The pseudorapidity spectra of fast particles （with β 〉 0.7） produced in Au （at 11.6 A GeV） and Pb （at 158 A GeV） induced collisions with emulsion （Em） nuclei contain some visual plateaus and ...shoulders. The plateau is wider for Pb＋Em reactions compared with the Au＋Em ones. The existence of a plateau is expected for parton models. The Fourier transformation and maximum entropy methods were used to get additional information about the plateaus. The dependence of the plateaus on the centrality of the collisions was also studied using the number of g-particles to fix centrality. It shows that the maximum entropy method could confirm the existence of the plateau and the shoulder on distributions.
A nuclear track emulsion was exposed to a mixed beam of relativistic sup.12N, sup.10C, and sup.7Be nuclei having a momentum of 2 GeV/c per nucleon. The beam was formed upon charge exchange processes ...involving sup.12C primary nuclei and their fragmentation. An analysis indicates that sup.10C nuclei are dominant in the beam and that sup.12N nuclei are present in it. The charge topology of relativistic fragments in the coherent dissociation of these nuclei is presented.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The angular structures of particles produced in
208
Pb at 158
A
GeV/
c
and
197
Au at 11.6
A
GeV/
c
induced interactions with Ag(Br) nuclei in emulsion detector have been investigated. Nonstatistical ...well-ordered ring-like structures of produced particles in azimuthal plane of a collision have been found, and their parameters have been determined.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Results on the coherent dissociation of relativistic
9
C nuclei in a nuclear track emulsion are described. These results include the charge topology and kinematical features of final states. Events ...of
9
C → 3
3
He coherent dissociation are identified.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The angular structures of particles produced in {sup 208}Pb-induced collisions with Ag(Br) nuclei in an emulsion detector at 158 A GeV/c have been investigated. Nonstatistical ringlike substructures ...in the azimuthal plane of the collision have been found and their parameters have been determined. An indication of the formation of ringlike substructures from two symmetrical emission cones, one in the forward and the other in the backward direction in the center-of-mass system, has been obtained. The ringlike substructures' parameters have been determined. The experimental results are in an agreement with I.M. Dremin's idea that the mechanism of the ringlike substructures' formation in nuclear collisions is similar to that of Cherenkov electromagnetic radiation.
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DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A nuclear track emulsion was exposed to a mixed beam of relativistic
12
N,
10
C, and
7
Be nuclei having a momentum of 2 GeV/
c
per nucleon. The beam was formed upon charge exchange processes ...involving
12
C primary nuclei and their fragmentation. An analysis indicates that
10
C nuclei are dominant in the beam and that
12
N nuclei are present in it. The charge topology of relativistic fragments in the coherent dissociation of these nuclei is presented.
Full text
Available for:
DOBA, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, IZUM, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PILJ, PNG, SAZU, SBCE, SBJE, SBMB, SIK, UILJ, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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