125 research outputs found
The Hoyle State in Relativistic C Dissociation
Production of -particle triples in the Hoyle state (HS) in
dissociation of C nuclei at 3.65 and 0.42 GeV in nuclear track
emulsion is revealed by the invariant mass approach. Contribution of the HS to
the dissociation C 3 is (11 3) \%. Reanalysis of
data on coherent dissociation O 4 at 3.65 GeV is
revealed the HS contribution of (22 2) \%.Comment: Submitted to Proceedings of XXII International Conference on Few-Body
Problems in Physics (FB22), 9 - 13 July, 2018, Caen, Franc
Irradiation of Nuclear Track Emulsions with Thermal Neutrons, Heavy Ions, and Muons
Exposures of test samples of nuclear track emulsion were analyzed. Angular
and energy correlations of products originating from the
thermal-neutron-induced reaction nB Li were studied in nuclear tack emulsions enriched in boron.
Nuclear track emulsions were also irradiated with Kr and
Xe of energy about 1.2 MeV per nucleon. Measurements of ranges
of heavy ions in nuclear track emulsions made it possible to determine their
energies on the basis of the SRIM model. The formation of high-multiplicity
nuclear stars was observed upon irradiating nuclear track emulsions with
ultrarelativistic muons. Kinematical features studied in this exposure of
nuclear track emulsions for events of the muon-induced splitting of carbon
nuclei to three alpha particles are indicative of the nuclear-diffraction
interaction mechanism.Comment: Pleiades Publishing, Ltd., 2015. 7 pages, 9 figure
Correlations of alpha-particles in splitting of C-12 nuclei by neutrons of energy of 14.1 MeV
Correlations of -particles are studied on statistics of 400 events of
splitting C 3 in nuclear track emulsion exposed to
neutrons. The ranges and emission angles of the -particles
are measured. Distributions over energy of -particle pairs and triples
are obtained.Comment: Author translation of report in Yadernaya Fizika (Physics of Atomic
Nuclei), vol. 76, additional issue (Russian), pp. 88-91 (2013); Proceedings
of the Conference on Fundamental interactions (MEPHI, Moscow, February 2013
Charge Topology of the Coherent Dissociation of Relativistic C-11 and N-12 Nuclei
The charge topology of coherent-dissociation events is presented for C
and N nuclei of energy 1.2~\textit{A}~GeV per nucleon bombarding nuclear
track emulsions. This topology is compared with respective data for Be,
B, C and N nuclei.Comment: Pleiades Publishing, Ltd., 2015. 5 pages, 2 figure
Peripheral interactions of relativistic N nuclei with emulsion nuclei
The results of investigations of the dissociation of a N nucleus of
momentum 2.86~A~GeV/c in photo-emulsion are presented. The main characteristics
of these reactions, that is the cross sections for various fragmentation
channels, are given.
The fragmentation was analyzed by means of an invariant approach. The
momentum and correlation characteristics of particles for the
N+X channel in the laboratory system and the rest systems of
3 particles were considered.
The results obtained for the N nucleus are compared with similar data
for the C and O nuclei.Comment: 10 pages, 7 figures, 2 tables, conference: Conference on Physics of
Fundamental Interactions, Moscow, Russia, 5-9 Dec 2005 (Author's translation
Irradiation of nuclear emulsions in relativistic beams of He-6 and H-3 nuclei
Using a Li-6 nucleus beam extracted from the JINR Synchrophasotron at
momentum 2.67A GeV/c a secondary beam was produced with a composition of 1% of
He-6 and 99% of H-3 nuclei. Preliminary results on the features of
nucleus-nucleus interactions of He-6 nuclei and charge exchange (CE) of H-3
nucleus are presented. Interactions of He-6 nucleus external neutrons with
emulsion nuclei as well as a coherent stripping of He-6 nucleus external
neutrons are observed. A mean range of H-3 nuclei to inelastic interactions in
the BR-2 type emulsion is equal to 23.3.0 cm. A mean range in emulsion for
a nuclear CE process H-3 to He-3 is equal to 4016 m. The CE cross-sections
with a charged meson production or without it are approximately equal. The CE
cross-section with excitation of a target nucleus exceeds the one without
excitation. The mean transverse momentum of He-3 nuclei is equal to
0.160.03 GeV/c.Comment: 10 pages, 6 figure
Clustering in relativistic dissociation of be, c, c and n nuclei
The dissociation features in nuclear track emulsion of Be, C,
and N nuclei of 1.2 A GeV energy are presented. The data presented for
the nucleus Be can be considered as evidence that there is a core in its
structure in the form of 0 and 2 states of the Be nucleus having
roughly equal weights. Events of coherent dissociation CHe
associated with the rearrangement of the nucleons outside the
-clustering are identified. A pattern of the charge fragment topology
in the dissociation of C and N nuclei is obtained for the first
time. Contribution of the unbound nucleus decays to the cascade process
CBBe is identified
Coherent Dissociation of Relativistic C-9 Nuclei
Results on the coherent dissociation of relativistic C nuclei in a
nuclear track emulsion are described. These results include the charge topology
and kinematical features of final states. Events of C-9 to 3He-3 coherent
dissociation are identified.Comment: 14 pages, 10 figures; ISSN 1063-778
Studies of light nicleus clustering in relativistic multifragmentation processes
We give an overview of results and prospects of nuclear clustering studies on
the grounds of the observations of interactions of light stable and radioactive
nuclei with an initial energy above 1 A GeV in nuclear emulsions. Thank to the
best spatial resolution and the full solid angle acceptance provided by nuclear
emulsions, such an approach allows one to obtain unique and evident
observations reecting cluster-like features in light nuclear structures. New
results on dissociation of Be in very peripheral interactions with emulsion
nuclei are presented. The importance of this research for the physics of few
body nuclear systems and the related problems of nucleosynthesis is noted. The
paper is illustrated with characteristic images obtained by means of a
microscope equipped with a CCD camera. The discussed explorations are provided
with the beams of the Synchrophasotron and Nuclotron of JINR, Dubna. Future
investigations are suggested to be carried out in relativistic beams of He, Be,
B, C, and N isotopes.Comment: 10 pages, 15 figure
Dissociation of C-10 Nuclei in a Track Nuclear Emulsion at an Energy of 1.2 GeV per Nucleon
The charge topology in the fragmentation of C nuclei in a track
nuclear emulsion at an energy of 1.2 GeV per nucleon is studied. In the
coherent dissociation of C nuclei, about 82% of events are associated
with the channel C 2 2\emph{p}. The angular
distributions and correlations of product fragments are presented for this
channel. It is found that among C 2 2\emph{p}
events, about 30% are associated with the process in which dissociation through
the ground state of the unstable Be nucleus is followed by
Be \emph{p} decays.Comment: ISSN 1063-7788, Pleiades Publishing, Ltd., 2013. 6 pages, 11 figure
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