C. Schmidt
GSI Helmholtz Centre for Heavy Ion Research
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Featured researches published by C. Schmidt.
Nuclear Physics | 2013
C. Rappold; E. Kim; D. Nakajima; T. Saito; O. Bertini; S. Bianchin; V. Bozkurt; Myroslav Kavatsyuk; Y. Ma; Frank Maas; S. Minami; B. Oezel-Tashenov; K. Yoshida; P. Achenbach; S. Ajimura; T. Aumann; C. Ayerbe Gayoso; H. Bhang; C. Caesar; S. Erturk; T. Fukuda; B. Göküzüm; E. Guliev; T. Hiraiwa; J. Hoffmann; G. Ickert; Z.S. Ketenci; D. Khaneft; M. J. Kim; S. K. Kim
Abstract 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 6Li projectiles on a carbon target at 2 A GeV was performed. Signals of the Λ-hyperon and H Λ 3 and H Λ 4 hypernuclei were observed for final states of p + π − , He 3 + π − and He 4 + 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 − 43 + 56 ± 45 ps for Λ, 183 − 32 + 42 ± 37 ps for H Λ 3 , and 140 − 33 + 48 ± 35 ps for H Λ 4 .
Physical Review C | 2013
C. Rappold; E. Kim; T. Saito; O. Bertini; S. Bianchin; V. Bozkurt; Myroslav Kavatsyuk; Y. Ma; Frank Maas; S. Minami; D. Nakajima; Kazuki Yoshida; P. Achenbach; S. Ajimura; T. Aumann; C. Ayerbe Gayoso; Hyoung Chan Bhang; C. Caesar; S. Erturk; T. Fukuda; B. Göküzüm; E. Guliev; J. Hoffmann; G. Ickert; Z.S. Ketenci; D. Khaneft; Min Suk Kim; S. Kim; K. Koch; N. Kurz
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.
International Journal of Modern Physics E-nuclear Physics | 2009
T. Saito; S. Bianchin; O. Borodina; J. Hoffmann; K. Koch; N. Kurz; Frank Maas; S. Minami; D. Nakajima; W. Ott; B. Oezel; C. Rappold; C. Schmidt; W. Trautmann; M. Traeger; S. Voltz; P. Achenbach; J. Pochodzalla; M. Sekimoto; Toshiyuki Takahashi; Myroslav Kavatsyuk; Y. Hayashi; T. Hiraiwa; M. Moritsu; T. Nagae; A. Okamura; M. Sako; H. Sugimura; K. Tanida; T. Fukuda
The HypHI experiment for precise hypernuclear spectroscopy with induced reactions of stable heavy ion beams and rare isotope beams is currently under preparation at GSI. The main goal of the HypHI project is to study neutron and proton rich hypernuclei and to measure directly hypernuclear magnetic moments at GSI and FAIR. In the first HypHI experiment (Phase 0) planned in 2009, the feasibility of precise hypernuclear spectroscopy with heavy ion beams will be demonstrated by observing π- decay channels of , and with 6Li projectiles at 2 A GeV impinging on a 12C target. An overview of the HypHI project and the details of the Phase 0 experiment will be discussed.
Physical Review C | 2013
C. Rappold; E. Kim; T. Saito; O. Bertini; S. Bianchin; V. Bozkurt; M. Kavatsyuk; Y. Ma; Frank Maas; S. Minami; D. Nakajima; B. Özel-Tashenov; K. Yoshida; P. Achenbach; S. Ajimura; T. Aumann; C. Ayerbe Gayoso; H. Bhang; C. Caesar; S. Erturk; T. Fukuda; B. Göküzüm; E. Guliev; J. Hoffmann; G. Ickert; Z.S. Ketenci; D. Khaneft; M. J. Kim; S. K. Kim; K. Koch
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.
Physical Review C | 2013
C. Rappold; S. K. Kim; D. Khaneft; K. Koch; A. Le Fèvre; Z.S. Ketenci; C. Ayerbe Gayoso; M. Sekimoto; G. Ickert; O. Bertini; J. Pochodzalla; B. Özel-Tashenov; T. Aumann; L. Nungesser; S. Voltz; D. Nakajima; S. Minami; E. Kim; B. Göküzüm; H. Bhang; K. Yoshida; V. Bozkurt; A. Sakaguchi; C. J. Yoon; G. Tambave; H. Simon; Y. Mizoi; S. Erturk; C. Schmidt; S. Ajimura
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.
Nuclear Physics | 2012
T.R. Saito; D. Nakajima; C. Rappold; S. Bianchin; O. Borodina; V. Bozkurt; B. Göküzüm; E. Kim; Y. Ma; Frank Maas; S. Minami; B. Özel-Tashenov; P. Achenbach; S. Ajimura; T. Aumann; C. Ayerbe Gayoso; H.C. Bhang; C. Caesar; S. Erturk; T. Fukuda; E. Guliev; Y. Hayashi; T. Hiraiwa; J. Hoffmann; G. Ickert; Z.S. Ketenci; D. Khaneft; M.J. Kim; S. H. Kim; K. Koch
Physics Letters B | 2015
C. Rappold; T. Saito; O. Bertini; S. Bianchin; V. Bozkurt; E. Kim; M. Kavatsyuk; Y. Ma; Frank Maas; S. Minami; D. Nakajima; B. Özel-Tashenov; K. Yoshida; P. Achenbach; S. Ajimura; T. Aumann; C. Ayerbe Gayoso; H. Bhang; C. Caesar; S. Erturk; T. Fukuda; B. Göküzüm; E. Guliev; J. Hoffmann; G. Ickert; Z.S. Ketenci; D. Khaneft; M. J. Kim; S. K. Kim; K. Koch