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Öğe BETA DECAY OF 82Ga STUDIED AT THE ALTO FACILITY(Jagiellonian Univ, 2023) Al Ayoubi, L.; Matea, I.; Kankainen, A.; Verney, D.; Al Falou, H.; Benzoni, G.; Bozkurt, V.Excited states in the N = 50 nucleus Ge-82 have been investigated via beta decay of Ga-82 at the ALTO facility. More than 50 new gamma transitions were identified. The preliminary results are presented in this work.Öğe Hypernuclear production cross section in the reaction of Li-6+C-12 at 2 A GeV(ELSEVIER SCIENCE BV, 2015) Rappold, C.; Saito, T. R.; Bertini, O.; Bianchin, S.; Bozkurt, V.; Kim, E.; Achenbach, P.Hypernuclear production cross sections have been deduced for the first time with induced reaction of heavy ion beam on fixed target and by means of the invariant mass method by the HypHI Collaboration exploiting the reaction of Li-6 C-12 at 2 A GeV or root S-NN = 2.70 GeV. A production cross section of 3.9 +/- 1.4 mu b for H-3(Lambda) and of 3.1 +/- 1.0 mu b for H-4(Lambda) respectively in the projectile rapidity region was inferred as well as the total production cross section of the Lambda hyperon was measured and found to be equal to 1.7 +/- 0.8 mb. A global fit based on a Bayesian approach was performed in order to include and propagate statistical and systematic uncertainties. Production ratios of H-3(Lambda)/H-4(Lambda), H-3(Lambda)/Lambda and H-4(Lambda)/Lambda were included in the inference procedure. The strangeness population fattors S-3 and S-4 of H-3(Lambda) and H-4(Lambda) respectively were extracted. In addition, the multiplicities of the Lambda hyperon, H-3(Lambda), and H-4(Lambda) together with the rapidity and transversal momentum density distributions of the observed hypemuclei were extracted and reported. (C) 2015 The Authors. Published by Elsevier B.V.Öğe On the measured lifetime of light hypernuclei H-3(Lambda) and H-4(Lambda)(ELSEVIER SCIENCE BV, 2014) Rappold, C.; Saito, T. R.; Bertini, O.; Bianchin, S.; Bozkurt, V.; Kavatsyuk, M.; Yoshida, K.A statistical combination of the experimental lifetime estimations available in the literatures is performed for H-3(Lambda) and H-4(Lambda), including several recent measurements. The combined average values of the lifetime for H-3(Lambda) and H-4(Lambda) are respectively 216(-16)(+19) ps and 192(-18)(+20) ps with a reduced chi(2) of 0.89 and 0.48. A new insight into the lifetime estimation of the HypHI Phase 0 experiment by a Bayesian approach is also presented. In this approach, several different prior distributions including the combination of previous lifetime data and a Jeffrey prior are used. The principal mode and the smallest credible interval at 68% of the posterior distribution, given by the prior belief of the previous measurements, are 217(-16)(+19) ps and 194(-18)(+20) ps respectively for H-3(Lambda) and H-4(Lambda). The two employed approaches have revealed that the lifetime of hypernuclei H-3(Lambda) and H-4(Lambda) can be shorter than the Lambda-hyperon lifetime. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.Öğe Production of hypernuclei in peripheral HI collisions: The HypHI project at GSI(ELSEVIER SCIENCE BV, 2012) Saito, T. R.; Nakajima, D.; Rappold, C.; Bianchin, S.; Borodina, O.; Bozkurt, V.; Achenbach, P.The HypHI Phase 0 experiment with Li-6 projectiles at 2 A GeV on a carbon target has been performed at GS' in order to demonstrate the feasibility of precise hypernuclear spectroscopy with peripheral heavy ion collisions. Current data analyses have preliminary shown peaks in invariant mass distributions of p + pi(-) for Lambda, He-3 + pi(-) for H-3(Lambda) and He-4 + pi(-) for H-4(Lambda). Lifetime values for the corresponding peaks have been also deduced, which is in good agreement with the former known values. (C) 2012 Elsevier B.V. All rights reserved.Öğe Scintillating fiber detectors for the HypHI project at GSI(ELSEVIER SCIENCE BV, 2009) Nakajima, D.; Oezel-Tashenov, B.; Bianchin, S.; Borodina, O.; Bozkurt, V.; Gokuzum, B.; Fukuda, T.The construction and properties of three sets of two-dimensional scintillating fiber detector arrays for tracking of charged particles used in the HypHI Phase 0 experiment at GSI will be reported in this paper. The position resolutions and the detection efficiency of detectors have been obtained for each layer of detectors by using Li-6 primary beams and particles with Z = 1 produced by fragment reactions of Xe-136 projectiles on the hydrogen target. Besides, the response of energy deposition of charged particles in the first detector set placed right behind the target has been studied by using light projectile fragments with Z = 1, 2 and 3 produced by Ni-58 and C-12 beams. Extracted resolutions for energy deposition and position as well as the detection efficiency fulfill the requirements of the HypHl Phase 0 experiment. (C) 2009 Elsevier B.V. All rights reserved.Öğe Search for evidence of (3)(Lambda)n by observing d + pi(-) and t + pi(-) final states in the reaction of Li-6+C-12 at 2A GeV(AMER PHYSICAL SOC, 2013) Rappold, C.; Kim, E.; Saito, T. R.; Bertini, O.; Bianchin, S.; Bozkurt, V.; Achenbach, P.The experimental data obtained from the reaction of Li-6 projectiles at 2A GeV on a fixed graphite target were analyzed to study the invariant mass distributions of d + pi(-) and t + pi(-). Indications of a signal in the d + pi(-) and t + pi(-) invariant mass distributions were observed with significances of 5.3 sigma and 5.0 sigma, respectively, when including the production target, and 3.7 sigma and 5.2 sigma, respectively, when excluding the target. The estimated mean values of the invariant mass for d + pi(-) and t + pi(-) signal were 2059.3 +/- 1.3 +/- 1.7 MeV/c(2) and 2993.7 +/- 1.3 +/- 0.6 MeV/c(2) respectively. The lifetime estimation of the possible bound states yielding to d + pi(-) and t + pi(-) final states were deduced to be as 181(-24)(+30) +/- 25 ps and 190(-35)(+47) +/- 36 ps, respectively. Those final states may be interpreted as the two-body and three-body decay modes of a neutral bound state of two neutrons and a Lambda hyperon, (3)(Lambda)n.Öğe Summary of the HypHI Phase 0 experiment and future plans with FRS at GSI (FAIR Phase 0)(ELSEVIER SCIENCE BV, 2016) Saito, T. R.; Rappold, C.; Bertini, O.; Bianchin, S.; Bozkurt, V.; Geissel, H.; Oezel-Tashenov, B.Results of the HypHI Phase 0 experiment with the reaction of Li-6+C-12 at 2 A GeV are summarised. Invariant mass distributions as well as,the lifetime measurements for H-3(Lambda) and H-4(Lambda) are discussed. The lifetime values for both the hypernuclei are respectively observed to be 18(-32)(+42) ps and 140(-33)(+48) ps, being significantly shorter than those of the Lambda-hyperon. Statistical analyses of existing lifetime data for H-3(Lambda) up to 2014 confirm a significantly short lifetime of H-3(Lambda), which is not explained by present models. Observed hypernuclear production cross section values for H-3(Lambda) and H-4(Lambda) are also summarised. In addition, observed signals for the final states of d + pi(-) and t + pi(-) are discussed. All the discussions on the results of the HypHI Phase 0 experiment in this article are based on [1-4]. We also present a new proposed experiment with the FRS (FRagment Separator) at GSI (FAIR Phase 0) to improve the precision of the hypernuclear spectroscopy with peripheral heavy ion induced reactions. (C) 2016 Elsevier B.V. All rights reserved.Öğe The HypHI Phase 0 experiment(ELSEVIER SCIENCE BV, 2010) Saito, T. R.; Bianchin, S.; Borodina, O.; Bozkurt, V.; Gokuzum, B.; Kavatsyuk, M.; Aumann, T.The HypHI Phase 0 experiment to demonstrate the feasibility of precise hypernuclear spectroscopy with induced reactions of heavy ion beams was performed at GSI in August and October in 2009, with a projectile of Li-6 at 2 A GeV impinged on carbon graphite target with a thickness of 8 g/cm(2). The experiment mainly aims to reconstruct events of H-3(Lambda), H-4(Lambda) and He-5(Lambda) by observing the pi(-) decay channel. Details of the HypHI Phase 0 experiment performed in August in 2009 will be discussed.
