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Unstable states in dissociation of relativistic nuclei

Recent findings and prospects of research

  • Regular Article - Experimental Physics
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Abstract

Results are presented on the identification of the unstable nuclei \(^{8}\)Be and \(^{9}\)B and the Hoyle state (HS) in the relativistic dissociation of the isotopes \(^{9}\)Be, \(^{10}\)B, \(^{10}\)C, \(^{11}\)C, \(^{12}\)C, and \(^{16}\)O in a nuclear track emulsion (NTE). The main motivation for the study is the prospect of using these states in the search for more complex unstable states that decay with their participation. The possibilities of the NTE method for studying the contribution of multiple ensembles of the lightest He and H nuclei to the fragmentation of relativistic nuclei are described in brief. It is shown that to identify relativistic decays \(^{8}\)Be and \(^{9}\)B and HS in NTE, it is sufficient to determine the invariant mass as a function of angles in pairs and triples of He and H fragments in the approximation of conservation of momentum per nucleon of the parent nucleus. The formation of HS in the dissociation \(^{16}\)O \(\rightarrow \) 4\(\alpha \) is observed. According to the criteria established in this way, the contribution of the unstable states to the relativistic fragmentation of \(^{28}\)Si and \(^{197}\)Au nuclei was estimated. Promising applications of the NTE method in the study of nuclear fragmentation are discussed.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Data sets are available upon request on the website http://becquerel.jinr.ru/.]

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Authors and Affiliations

  1. Joint Institute for Nuclear Research, Dubna, Russia

    D. A. Artemenkov, V. Bradnova, N. K. Kornegrutsa, A. I. Malakhov, E. Mitsova, V. V. Rusakova, A. A. Zaitsev, P. I. Zarubin & I. G. Zarubina

  2. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia

    M. M. Chernyavsky, N. G. Peresadko, A. A. Zaitsev & P. I. Zarubin

  3. Institute of Space Science, Magurele, Romania

    E. Firu, M. Haiduc & A. Neagu

  4. Southwestern University, Blagoevgrad, Bulgaria

    R. Stanoeva

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  1. D. A. Artemenkov
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  2. V. Bradnova
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  3. M. M. Chernyavsky
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  4. E. Firu
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Corresponding author

Correspondence to P. I. Zarubin.

Additional information

Communicated by David Blaschke.

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Artemenkov, D.A., Bradnova, V., Chernyavsky, M.M. et al. Unstable states in dissociation of relativistic nuclei. Eur. Phys. J. A 56, 250 (2020). https://doi.org/10.1140/epja/s10050-020-00252-3

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