Yields and transverse momenta of the 6Li fragments in the emulsion at 4.5 GeV/c per nucleon

Lepekhin, F.G.; Seliverstov, D. M.; Simonov, B. B.

doi:10.1007/s100500050043

Cited by 16 publications

(48 citation statements)

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“…In a previous analysis, 5 a systematic comparison using shower particle distributions of 6 Li and 7 Li interactions with emulsion nuclei when they participate in the interaction with one (Z = 1) or two (Z = 2) charged particles, respectively, led to the assumption that 6 Li can be considered as a cluster of (α + d), while 7 Li may not be (α + t). Here, we report on results from separating hydrogen and helium iso-topes by using their momentum measurements of 7 Li fragments at 3.8A GeV/c in emulsion interactions.…”

Section: Introductionmentioning

confidence: 99%

“…Here, we report on results from separating hydrogen and helium iso-topes by using their momentum measurements of 7 Li fragments at 3.8A GeV/c in emulsion interactions. The corresponding data for 6 Li fragments 6,7 at 4.5A GeV/c were used for comparison. Branching ratio of fragmentation channels as well as isotope fragment distributions were studied.…”

Section: Introductionmentioning

confidence: 99%

“…Branching ratio of fragmentation channels as well as isotope fragment distributions were studied. Information on the 7 Li and 6 Li structure estimation has been obtained from analyzing the data. Finally, there were a few events including 6 He (exotic nuclei), where the ( 6 He +p) was one of the dissociation channels of 7 Li nuclei.…”

Section: Introductionmentioning

confidence: 99%

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ESTIMATING THE STRUCTURE OF ^6,7Li AT ~4.0A GeV/c BY MOMENTA MEASUREMENTS OF PROJECTILE FRAGMENTS IN EMULSION INTERACTIONS

et al. 2005

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This work presents results on charged state topology of relativistic fragmentation of 6 Li and 7 Li nuclei at 4.5A and 3.8A GeV/c, respectively, on photoemulsion nuclei. The results would make it possible to answer some topical questions concerning the cluster structure of lithium isotopes. The isotopic composition of fragments and the channels of 6,7 Li fragmentation as well as the mean momenta ρβc of projectile fragments have been measured. Yields of 1 H (3 He ) appear to have the highest probability due to the fragmentation of 7 Li , while 2 H (4 He ) and 1 H (4 He ) are dominant through 6 Li -fragmentation process. The presence of exotic 6 He among fragmentation process is observed in 7 Li with yield 3% while 0.65% were found in 6 Li .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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ESTIMATING THE STRUCTURE OF ^6,7Li AT ~4.0A GeV/c BY MOMENTA MEASUREMENTS OF PROJECTILE FRAGMENTS IN EMULSION INTERACTIONS

et al. 2005

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“…Here 6 Li and 7 Li projectile nuclei are treated as two weakly-bound systems composed of ( 4 He + d) and ( 4 He + t) cluster configurations, respectively. In these nuclei an easily formed α-cluster core leaves the other nucleons, less tightly connected with the core, free to form the other charged cluster with relatively high probability [Lepekhin et al (1998)].…”

Section: Introductionmentioning

confidence: 99%

Projectile fragmentation of 6,7Li nuclei in photoemulsion at Dubna energy

Mekhimar¹,

Tabal²,

El-Sharkawy³

et al. 2014

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Stripping and diffraction dissociation processes of 6 Li at incident momentum 4.5AGeV/c and 7 Li at incident momentum 3AGeV/c, provided by the JINR Synchrophastron, were studied using the photoemulsion technique. The two stable isotopes of 6 Li and 7 Li were treated as two weakly-bound systems composed of (4 He+d) and (4 He+t) cluster configurations, respectively. Along the track double scanning method was carried out in order to search for 6,7 Li interactions in emulsion (Em). For 6 Li-Em about 1050 inclusive events were recorded with mean free path 14.5 ± 0.5 cm while about 1015 events were detected for 7 Li-Em with mean free path 15.1 ± 0.6 cm. The type of momentum distribution inside the projectile according to which the features of each mechanism can be correctly explained and the difference between the angular distributions of these processes are theoretically discussed. The total cross sections of both stripping and dissociation are estimated theoretically as well as experimentally. The measured angular distributions of the outgoing fragments were compared with that calculated theoretically and good agreement between the experimental and theoretical values is obtained. This agreement supported the presence of 6,7 Li nuclei in a cluster mode at high energy reactions.

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“…The study of cluster fragmentation of the nuclei 6 Li (α-d) [2][3][4][5], 12 C (3α) [6][7][8][9] and 16 О (4α) [10] performed by the emulsion technique serves as a guide for our project. In what follows we discuss the results of research of the 10 B and 7 Li cluster structure.…”

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Investigation of clustering in light nuclei by means of relativistic-multifragmentation processes

et al. 2004

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The use of emulsions for studying nuclear clustering in light nucleus fragmentation processes at energies higher than 1A GeV is discussed. New results on the topologies of relativistic 7 Li and 10 B nucleus fragmentation in peripheral interactions are given. A program of research of the cluster structure in stable and radioactive nuclei is suggested.Progress achieved in the study with relativistic nucleus beams gives rise to new approaches in solving some topical problems of the nuclear structure. Among them is a search for collective degrees of freedom in which separate groups of nucleons behave like composing clusters. Such a peculiar feature, clustering in excited nuclei, is revealed especially clearly in light nuclei, in which the possible number of cluster configurations is rather small. The natural components of such a picture are few-nucleon systems having no proper nuclear excitations. First of all these are α-particles, as well as pairing proton and neutron states, deuterons, tritons, and 3 He nuclei. Possibly, the study of the decays of stable and radioactive nuclei to cluster fragments might reveal some new particularities of their origin and their role in cosmic-ray nucleosynthesis.In our case the use of nuclear beams of energy above 1A GeV is based on the established phenomenon of limiting fragmentation of nuclei. This implies that the isotopic compound of the fragments of a projectile in a narrow forward angular cone is independent of the type of a target-nucleus and the nature of a reaction. The reaction takes up the shortest time. One of the technical merits is the absence of the energy threshold for detecting a fragmentation process.The most advantageous way for studying clustering is the use of peripheral interactions of relativistic nuclei which occur at a minimal mutual excitations of colliding nuclei caused by electromagnetic and diffractive interactions and the absence of charged meson production. In this case, a clear separation of nuclear fragmentation products according to rapidity is achieved. The requirements of conservation of the electric charge and mass number of a projectile, and narrow angular correlations of relativistic fragments might be employed in the analysis.The reliable and complete observation of the multiparticle relativistic fragmentation processes is a motivation for which we have used nuclear emulsion technique. Emulsions enable us to establish the most feasible charge channels of such processes. Measurements of multiple scattering angles make it possible to determine the total momentum of hydrogen and helium relativistic fragments and thereby to determine their mass. The record angular resolution of emulsions allows one to reconstruct the invariant mass (excitations) of a fragmenting system.

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Yields and transverse momenta of the 6Li fragments in the emulsion at 4.5 GeV/c per nucleon

Cited by 16 publications

References 10 publications

ESTIMATING THE STRUCTURE OF ^6,7Li AT ~4.0A GeV/c BY MOMENTA MEASUREMENTS OF PROJECTILE FRAGMENTS IN EMULSION INTERACTIONS

ESTIMATING THE STRUCTURE OF ^6,7Li AT ~4.0A GeV/c BY MOMENTA MEASUREMENTS OF PROJECTILE FRAGMENTS IN EMULSION INTERACTIONS

Projectile fragmentation of 6,7Li nuclei in photoemulsion at Dubna energy

Investigation of clustering in light nuclei by means of relativistic-multifragmentation processes

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Yields and transverse momenta of the 6Li fragments in the emulsion at 4.5 GeV/c per nucleon

Cited by 16 publications

References 10 publications

ESTIMATING THE STRUCTURE OF 6,7Li AT ~4.0A GeV/c BY MOMENTA MEASUREMENTS OF PROJECTILE FRAGMENTS IN EMULSION INTERACTIONS

ESTIMATING THE STRUCTURE OF 6,7Li AT ~4.0A GeV/c BY MOMENTA MEASUREMENTS OF PROJECTILE FRAGMENTS IN EMULSION INTERACTIONS

Projectile fragmentation of 6,7Li nuclei in photoemulsion at Dubna energy

Investigation of clustering in light nuclei by means of relativistic-multifragmentation processes

Contact Info

Product

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ESTIMATING THE STRUCTURE OF ^6,7Li AT ~4.0A GeV/c BY MOMENTA MEASUREMENTS OF PROJECTILE FRAGMENTS IN EMULSION INTERACTIONS

ESTIMATING THE STRUCTURE OF ^6,7Li AT ~4.0A GeV/c BY MOMENTA MEASUREMENTS OF PROJECTILE FRAGMENTS IN EMULSION INTERACTIONS