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Journal Articles

Recent results in fragmentation isomer spectroscopy with rising

Pietri, S.*; Regan, P. H.*; Podoly$'a$k, Zs.*; Rudolph, D.*; Steer, S. J.*; Garnsworthy, A. B.*; Werner-Malento, E.*; Hoischen, R.*; G$'o$rska, M.*; Gerl, J.*; et al.

Nuclear Instruments and Methods in Physics Research B, 261(1-2), p.1079 - 1083, 2007/08

 Times Cited Count:89 Percentile:98.67(Instruments & Instrumentation)

The first results from the stopped beam RISING experimental campaign performed at the GSI laboratory in Darmstadt, Germany, are presented. RISING constitutes a major new experimental program in European nuclear structure physics research aimed at using relativistic energy (typically around 1 GeV per nucleon) projectile fragmentation reactions to populate nuclei with highly exotic proton-to-neutron ratios compared to the line of beta stability. In its high-efficiency stopped beam configuration, the RISING $$gamma$$-ray spectrometer consists of 105 individual germanium crystals which view a focal plane in which the exotic nuclei are brought to rest. Here, decays from metastable states with half-lives in the nano to milliseconds range can be observed. Results of initial commissioning experiments are also shown and details of the planned future experimental program are given.

Oral presentation

Characterization of loops in YSZ by Ne$$^{+}$$ irradiation

Hojo, Tomohiro*; Yasuhara, Akira*; Yamamoto, Hiroyuki; Aihara, Jun; Furuno, Shigemi*; Sawa, Kazuhiro; Sakuma, Takashi*; Hojo, Kiichi

no journal, , 

Yttria stabilized zirconia (YSZ) is a candidate material as optical and insulating materials in nuclear reactors. The investigation of defect formation under the ion irradiation is therefore required. In the present study, YSZ was irradiated with 30 keV Ne$$^{+}$$ ions with a flux of 3$$times$$10$$^{15}$$ ions/cm$$^{2}$$ at 923 K. Compositional changes were analyzed by energy dispersive X-ray spectrometer (EDS) equipped with transmission electron microscope. From the observation of micrographs, it was shown that dislocation loops were formed on three kinds of crystallographic planes, namely, on (110), (111) and (112) planes. The dislocation loops inhabiting on (110) crystal plane were analyzed by EDS along the loops. The average composition between the vicinity of loops and the matrix is compared. On the basis of the obtained results, it is observed composition of oxygen on loops decreases and zirconium increases compared with the matrix.

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