Author: "Kojouharov I" - Searchworks@Jio Institute Digital Library Search Results

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Author: Domingo-Pardo C, Goel N, Engert T, Gerl J, Isaka M, Kojouharov I, and Schaffner H
Subjects: Computer-Aided Design, Equipment Design, Equipment Failure Analysis, Reproducibility of Results, Sensitivity and Specificity, Gamma Cameras, Image Enhancement instrumentation, Positron-Emission Tomography instrumentation, Transducers
Abstract: The performance of a position sensitive gamma-ray scintillator detector (PSD) is described. This PSD is based on a lutetium yttrium oxyorthosilicate (LYSO) crystal read out by a crossed-wire anode position sensitive photomultiplier tube (PSPMT). The main difference with respect to similar existing devices is the individual multi-anode readout (IMAR) approach that is followed here. This method allows to exploit better the intrinsic characteristics of the PSPMT, thus yielding better linearity, improved spatial resolution, and a larger field of view. The new detector is intended for the characterization of 3-D position sensitive germanium detectors.
Published: 2009
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Author: Wieland O, Bracco A, Camera F, Benzoni G, Blasi N, Brambilla S, Crespi FC, Leoni S, Million B, Nicolini R, Maj A, Bednarczyk P, Grebosz J, Kmiecik M, Meczynski W, Styczen J, Aumann T, Banu A, Beck T, Becker F, Caceres L, Doornenbal P, Emling H, Gerl J, Geissel H, Gorska M, Kavatsyuk O, Kavatsyuk M, Kojouharov I, Kurz N, Lozeva R, Saito N, Saito T, Schaffner H, Wollersheim HJ, Jolie J, Reiter P, Warr N, deAngelis G, Gadea A, Napoli D, Lenzi S, Lunardi S, Balabanski D, LoBianco G, Petrache C, Saltarelli A, Castoldi M, Zucchiatti A, Walker J, and Bürger A
Abstract: The gamma decay from Coulomb excitation of 68Ni at 600 MeV/nucleon on a Au target was measured using the RISING setup at the fragment separator of GSI. The 68Ni beam was produced by a fragmentation reaction of 86Kr at 900 MeV/nucleon on a 9Be target and selected by the fragment separator. The gamma rays produced at the Au target were measured with HPGe detectors at forward angles and with BaF2 scintillators at backward angles. The measured spectra show a peak centered at approximately 11 MeV, whose intensity can be explained in terms of an enhanced strength of the dipole response function (pygmy resonance). Such pygmy structure has been predicted in this unstable neutron-rich nucleus by theory.
Published: 2009
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Author: Jungclaus A, Cáceres L, Górska M, Pfützner M, Pietri S, Werner-Malento E, Grawe H, Langanke K, Martínez-Pinedo G, Nowacki F, Poves A, Cuenca-García JJ, Rudolph D, Podolyak Z, Regan PH, Detistov P, Lalkovski S, Modamio V, Walker J, Bednarczyk P, Doornenbal P, Geissel H, Gerl J, Grebosz J, Kojouharov I, Kurz N, Prokopowicz W, Schaffner H, Wollersheim HJ, Andgren K, Benlliure J, Benzoni G, Bruce AM, Casarejos E, Cederwall B, Crespi FC, Hadinia B, Hellström M, Hoischen R, Ilie G, Jolie J, Khaplanov A, Kmiecik M, Kumar R, Maj A, Mandal S, Montes F, Myalski S, Simpson GS, Steer SJ, Tashenov S, and Wieland O
Abstract: The gamma decay of excited states in the waiting-point nucleus (130)Cd(82) has been observed for the first time. An 8(+) two-quasiparticle isomer has been populated both in the fragmentation of a (136)Xe beam as well as in projectile fission of 238U, making (130)Cd the most neutron-rich N = 82 isotone for which information about excited states is available. The results, interpreted using state-of-the-art nuclear shell-model calculations, show no evidence of an N = 82 shell quenching at Z = 48. They allow us to follow nuclear isomerism throughout a full major neutron shell from (98)Cd(50) to (130)Cd(82) and reveal, in comparison with (76)Ni(48) one major proton shell below, an apparently abnormal scaling of nuclear two-body interactions.
Published: 2007
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