Experimental study of relativistic hypernuclei using the HYBS-spectrometer

Abdurakhimov, A.U.; Aksinenko, V. D.; Anikina, M.; Avramenko, S.A.; Bannik, B.P.; Butenko, V.A.; Glagoleva, N.S.; Golokhvastov, A. I.; Grachev, A. G.; Dementiev, E. A.; Дроздов, В. А.; Kaminsky, N.I.; Khorozov, S.A.; Kirillov, A.D.; Kozubsky, E.V.; Kulakov, B.A.; Кузнецов, А. А.; Кузнецова, Е. С.; Luboshitz, V. L.; Lukstiņš, J.; Mandrik, O.Yu.; Maniakov, P. K.; Matushin, A. T.; Matushin, V. T.; Mukhin, S. V.; Nikityuk, N.M.; Okhrimenko, L.S.; Okonov, E.O.; Ostanevich, T.G.; Radomanov, V.B.; Rozhnyatovskaya, S. A.; Rukoyatkin, P.; Ryakhovsky, V. N.; Saitov, I.S.; Sedykh, S.; Svetov, A. L.; Vardenga, G.; Zavialov, V. F.; Belikov, Yu.A.; Kondratiev, V.; Krasnov, L.V.; Shevchenko, I.E.; Stepanov, I.V.; Gaevsky, K.; Mirkovsky, Ya.; Pavlovsky, Z.; Piatkovsky, A.; Khusainov, E. K.; Nurgozhin, N. N.; Pol, Yu.S.; Taran, G.G.; Iovchev, K.

doi:10.1007/bf02734881

Cited by 26 publications

(4 citation statements)

References 5 publications

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“…The situation is well summarized by figure 2. 3 Finally, it should be mentioned that hypernuclei were produced also in p annihilations [34] or in heavy ion collisions [35][36][37][38].…”

Section: Hypernucleus Production Methodsmentioning

confidence: 99%

Experimental review of hypernuclear physics: recent achievements and future perspectives

Feliciello¹,

Nagae²

2015

Rep. Prog. Phys.

109

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Since the shutdown of several old proton synchrotrons, which played a fundamental role in the second generation experiments in hypernuclear physics performed in Europe, USA and Japan, some new experimental setups aiming to achieve sub-MeV energy resolution have been operating for a long time. Over the last decade the hypernuclear physics community has been committed to carrying out several third generation experiments by exploiting the potential offered by new accelerators, such as a continuous electron beam machine and a ϕ-factory. Large data samples were collected on specific items thanks to dedicated facilities and experimental apparatuses. The attention was mainly focused on both high-resolution spectroscopy and the decay mode study of single Λ-hypernuclei. Nowadays this phase is over but, until recently, important and, to some extent, unexpected results were achieved. An updated review of selected experimental results is presented, as well as a survey of perspectives for future studies.

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“…The situation is well summarized by figure 2. 3 Finally, it should be mentioned that hypernuclei were produced also in p annihilations [34] or in heavy ion collisions [35][36][37][38].…”

Section: Hypernucleus Production Methodsmentioning

confidence: 99%

Experimental review of hypernuclear physics: recent achievements and future perspectives

Feliciello¹,

Nagae²

2015

Rep. Prog. Phys.

109

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“…However, the measured cross section of the hypernuclear candidates greatly exceeded the theoretical expectations, which was ascribed to a difficulty with implementing the kaon trigger. Subsequently, an experiment performed by bombarding a polyethylene target with beams of 4 He at 3.7 A GeV and 7 Li at 3.0 A GeV was successful in producing light hypernuclei [8,9]. However, since the invariant mass of the final states was not measured, there was ambiguity in identifying the hypernuclei produced.…”

Section: Introductionmentioning

confidence: 99%

Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2A GeV

et al. 2013

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A novel experiment, aiming at demonstrating the feasibility of hypernuclear spectroscopy with heavy-ion beams, was conducted. Using the invariant mass method, the spectroscopy of hypernuclear products of 6 Li projectiles on a carbon target at 2 A GeV was performed. Signals of the Λ-hyperon and 3 Λ H and 4 Λ H hypernuclei were observed for final states of p+π − , 3 He+π − and 4 He+π − , respectively, with significance values of 6.7, 4.7 and 4.9σ. By analyzing the proper decay time from secondary vertex distribution with the unbinned maximum likelihood fitting method, their lifetime values were deduced to be 262 +56 −43 ± 45 ps for Λ, 183 +42 −32 ± 37 ps for 3 Λ H, and 140 +48 −33 ± 35 ps for 4 Λ H.

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“…Cross sections for single-and double-A hypernuclei have been estimated in [14] and have recently been measured in [15]. The properties of multihypernuclei [13,16] are still one of the least-explored, Open questions in hypernuclear research.…”

Section: Introductionmentioning

confidence: 99%

Metastable exotic multihypernuclear objects

1992

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Relativistic heavy ion collisions constitute a prolific source of hyperons: tens of hyperons per event are predicted at energies E 1 10 GeV/nucleon, providing a scenario for the formation of metastable exotic multihypernuclear objects. They may exhibit exceptional properties: bound neutral (e.g., 4 M : l , ''M&, pure A droplets, 8 A ) and even negatively charged composites objects with positive baryon number ie.g., 4~: 2 -, 6M2" 2A25 ) could be formed in rare events. Such negative nuclei can easily be identified in a magnetic spectrometer. They could be considerably more abundant than antinuclei of the same A. We use the relativistic meson-baryon field theory-which gives an excellent description of normal nuclear and single-A hypernuclear properties-to calculate the rich spectrum of such exotic objects, their stability, and their structure. We also find solutions for a large variety of bound short-lived nuclei (e.g., 8~2~2 "2 n , 2 n P ), which may decay strongly via formation of cascade ( E ) particles. Multi-E hypernuclei are also evaluated. A variety of potential candidates for such metastable exotic nuclei is presented. It turns out that the properties of such exotic multihypernuclear objects reveal quite similar features as the strangelet proposed as a unique signature for quark-gluon plasma formation in heavy ion collisions. PACS numberis): 25.75. +r, 21.80. + a

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Experimental study of relativistic hypernuclei using the HYBS-spectrometer

Cited by 26 publications

References 5 publications

Experimental review of hypernuclear physics: recent achievements and future perspectives

Experimental review of hypernuclear physics: recent achievements and future perspectives

Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2A GeV

Metastable exotic multihypernuclear objects

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