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[en] A medium-spin isomer in 197Au is identified with t1/2=150(5) ns following a multinucleon transfer reaction between an 850-MeV 136Xe beam and a 198Pt target. The transitions identified here are considered and possible configurations for the associated levels discussed. In addition, a newly observed out-of-beam transition in 195Au is briefly reported
[en] The Enriched Xenon Observatory (EXO) Collaboration is building a series of experiments to search for the neutrinoless double beta decay of 136Xe. The first experiment, known as EXO-200, will utilize 200 kg of xenon enriched to 80% in the isotope of interest, making it the largest double beta decay experiment to date by one order of magnitude. This experiment is rapidly being constructed, and will begin data taking in 2007. The EXO collaboration is also developing a technique to identify on an event-by-event basis the daughter barium ion of the double beta decay. If successful, this method would eliminate all conventional radioactive backgrounds to the decay, resulting in an ideal experiment. We summarize here the current status of EXO-200 construction and the barium tag R and D program
[en] It is shown that the multinucleon transfer reactions in low-energy collisions of heavy ions may be used for production of new neutron-rich nuclei at the ''northeast'' part of the nuclear map along the neutron closed shell N=126 which plays an important role in the r process of nucleosynthesis. More than 50 unknown nuclei might be produced in such reactions (in particular, in collision of 136Xe with 208Pb) with cross sections of not less than 1 μb
[en] Energy levels in 160Er and 159Er were excited in the reactions: 28Si(136Xe,4n)160 Er, 28Si(136Xe,5n)159Er and the product nuclei, recoiling with a velocity v=0.07c were stopped in a plunger instrument after traversing a volume of hydrogen gas. The angular distribution of de-excitation gamma rays was studied as a function of flight time and gas pressure. Appreciable perturbations were detected in 160Er at times as short as 2 ps and in an angular momentum region as high as 12h. No perturbation could be detected in the 21/2+ level of 159Er even after 12 ps, signifying a low value for the g-factor of this level. (author)
[en] Using the reduced-density-matrix formalism, the interaction time of two heavy nuclei is studied. In the reactions 136Xe+136Xe and 238U+238U, the mean interaction time and variance of interaction time distribution are calculated and compared with those of other treatments.