Nuclear track emulsion in search for the Hoyle-state in dissociation of relativistic 12C nuclei

Artemenkov, D. A.; Bradnová, V.; Britvich, G.I.; Firu, Elena; Kalinin, V. A.; Kharlamov, S. P.; Kornegrutsa, N. K.; Kostin, M. Yu.; Maksimov, A. V.; Mitseva, E.; Neagu, Alina Tania; Pikalov, V. A.; Polkovnikov, M. K.; Rusakova, V. V.; Stanoeva, R.; Zaitsev, A.; Zarubin, P. I.; Zarubina, I. G.

doi:10.1016/j.radmeas.2018.11.005

Cited by 10 publications

(8 citation statements)

References 9 publications

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“…9 B → 8 Bep decays can be considered as a pure source of 8 Be nuclei. Their analysis allowed us to confirm the criterion Q 2α < 0.2 MeV for the selection of 8 Be which takes into account the adopted approximation and resolution of the method [3].…”

Section: Introductionmentioning

confidence: 83%

The Hoyle State in the Relativistic Dissociation of Light Nuclei

Zaitsev

Zarubin

2019

Phys. Atom. Nuclei

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In the context of the search for triples of relativistic α-particles in the Hoyle state, the analysis of available data on the dissociation of the nuclei 12 C, 16 O and 22 Ne in the nuclear emulsion was carried out. The Hoyle state is identified by the invariant mass calculated from pair angles of expansion in α-triples in the approximation of the conservation of the momentum per nucleon of the parent nucleus. The contribution of the Hoyle state to the dissociation of 12 C → 3α is 11%. In the case of the coherent dissociation of 16 O → 4α it reaches 22% when the portion of the channel 16 O → 2 8 Be is equal to 5%. PACS numbers: 21.60.Gx, 25.75.-q, 29.40.Rg

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Section: Introductionmentioning

confidence: 83%

The Hoyle State in the Relativistic Dissociation of Light Nuclei

Zaitsev

Zarubin

2019

Phys. Atom. Nuclei

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“…3 with the condition Q 2α ( 8 Be) ≤ 0.2 MeV and selection of protons, indicates 60 9 B decays to Q 2αp ( 9 B) ≤ 0.5 MeV. The average value Q 2αp (RMS) = 271 ± 15 (120) keV corresponds to the NTE result [6]. Similarly, the peak in the distribution Q 3α (HS) ≤ 0.7 MeV with the condition Q 2α ( 8 Be) ≤ 0.2 MeV corresponds to the identification of 47 HS decays, having Q 3α (RMS) = 322 ± 25 (180) keV [9].…”

Section: Fragmentation Of 1o On Protonsmentioning

confidence: 91%

“…Despite the fact that coherent dissociation 12 C → 3α and 16 O → 4α is only 1-2% of inelastic interactions, a targeted search performed by transverse scanning made it possible to investigate by the invariant mass method 310 3α and 641 4α "white" stars [4,5] and establish in both cases the contributions of 3α-decays of the Hoyle state (HS) [6,7]. In general, the invariant mass Q = M * -M is given by the sum M * 2 = Σ(P i • P k ), where P i,k are 4-momenta of fragments, and M is their mass.…”

Section: Introductionmentioning

confidence: 99%

Correlation in formation of $^{8}$Be nuclei and $α$-particles in fragmentation of relativistic nuclei

Zaitsev,

Artemenkov,

Glagolev

et al. 2021

Preprint

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In the events of peripheral dissociation of relativistic nuclei in the nuclear track emulsion, it is possible to study the emerging ensembles of He and H nuclei, including those from decays of the unstable 8 Be and 9 B nuclei, as well as the Hoyle state. These extremely short-lived states are identified by invariant masses calculated from the opening angles in 2α-pairs, 2αp-and 3αtriplets in the approximation of conservation of momentum per nucleon of the primary nucleus.In the same approach, it is possible to search for more complex states. This paper explores the correlation between the formation of 8 Be nuclei and the multiplicity of accompanying α-particles in the dissociation of relativistic 16 O, 22 Ne, 28 Si, and 197 Au nuclei. On this basis, estimates of such a correlation are presented for the unstable 9 B nucleus and the Hoyle state. An enhancement in the 8 Be contribution to dissociation with the α-particle multiplicity is found. Decays of 9 B nuclei and Hoyle states follow the same trend.

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“…Therefore, it cannot be ruled out that they can serve as transient states persisting in the bound nuclei. The obtained experience was applied recently to identify for relativistic decays of the Hoyle-state [9]. At the time, production of NTE layers in Moscow that had lasted for forty years stopped more than decade ago.…”

Section: Introductionmentioning

confidence: 99%