Results 1 - 10 of 68
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[en] This workshop aims at presenting the latest advances in nuclear fission. The various topics dealt with are as follows: fission experiments, fission theory, instrumentation for fission studies, nuclear data, fission fragment spectroscopy and theory for neutron-rich nuclei. This document is made up of the abstracts and the slides of the presentations.
[en] In this series of slides, the author shows that reactor neutrino experiments are now in the precision era with upcoming high statistics measurements. It appears that neutrino energy spectra are sensitive to fission yields and nuclear structure and could be used as integral experiments to validate nuclear data bases and get new insight on fission and beta-decay processes.
[en] This series of slides details the first observation of excited states in 88Se. The level scheme is interpreted with the shell model. The structure appears to be consistent with a γ-soft or transitional nucleus and collectivity seems to develop from pseudo-SU(3) scheme.
[en] The isotopic yields of 236U*, obtained after identification in mass and charge of both fission fragments, have been measured with unprecedented resolution at GSI using the SOFIA2 setup and the inverse kinematic method. Prompt neutron yields and total kinetic energies have also been obtained. After an overview of the experimental method and of the fission-triggering method, we will discuss the results and compare them to nuclear databases and to other experimental data. In particular, the combination of these results with the previous SOFIA1 data obtained on 234,235,238U* allows for a detailed description of the influence of the neutron numbers on the fragments distributions. This document is made up of an abstract and the slides of the presentation. (author)
[en] This series of slides present the excited states that have been identified in 116,118,120Sn using the (nth, γ) reactions on natural Sn. A 85-keV transition has been identified in 116Sn using the β decay of the I=5+, T = 54.29 mn state of 116m1In. Partial energy level schemes of Sn isotopes are given.
[en] Photofission in the barrier region suffers from relatively low cross sections. Hence, besides using intense Bremsstrahlung (S-DALINAC) or monochromatic gamma ray beams (ELI-NP), significant amounts of target material needs to be placed in the beam to reach sufficient luminosity. We set up and tested a multi-stack Frisch-grid ionisation chamber and obtained angular and mass distributions as well as total kinetic energy of fission fragments in neutron-induced fission of 232Th and 238U. For the measurement of the azimuthal angular distribution segmented anodes have been used. This document is made up of an abstract and a poster. (authors)
[en] The new separator-spectrometer combination S3, presently under construction at the new SPIRAL-2 facility of GANIL, Caen, France, together with the high intensity beams of SPIRAL-2's SC Linac, will offer exciting perspectives for a wide spectrum of nuclear and atomic physics topics. The properties of the heaviest nuclei (superheavy nuclei - SHN) are among the mayor features to be studied. The installation is designed to employ nuclear physics methods like decay spectroscopy after separation or atomic physics methods like laser spectroscopy and mass measurements. The state of the art of the SHN spectroscopy will be presented and an outline for the physics program at S3 will be given in this presentation. This document is made up of an abstract and the slides of the presentation. (author)
[en] The delayed gamma spectroscopy of fragments produced via spontaneous fission of 252Cf is studied. A thin 252Cf sample is loaded in a twin ionization chamber allowing performing 2E measurements for each fission events. An excellent mass-resolution of 0.4 amu (FWHM) is achieved for neutron-less fission events making it possible to unambiguously determine the mass of the fragments for these rare events. Ten HPGe (high purity germanium) detectors surround the chamber in order to study the delayed gamma rays emitted up to 10 μs after fission. In this talk, after presenting the setup and the general procedure for extracting the mass of the fission fragments I will discuss a first new result on N=100 nuclei interpreted with QRPA (quasiparticle random phase approximation) calculations. This document is made up of an abstract and the slides of the presentation. (author)
[en] The Extreme Light Infrastructure (ELI) Pan-European facility initiative represents a major step forward in quest for extreme electromagnetic fields. Extreme Light Infrastructure - Nuclear Physics (ELI-NP), which is under construction in Magurele, Romania, is one of the 3 pillars of the ELI, and aims at utilization of extreme electromagnetic fields for nuclear physics and quantum electrodynamics research and applications. It is one of the 3 Pan-European nuclear physics laboratories, which are at present under construction in the EU under the ESFRI scheme. At ELI-NP, high-power laser systems together with brilliant gamma beams are the main research tools. The status of the construction of the facility will be reported. The emerging experimental program with brilliant gamma beams at ELI-NP will be presented with emphasis on the prepared day-one photofission experiments. The physics cases of the flagship experiments at ELI-NP will be discussed, as well as the related instruments which are under construction for their realization. This document is made up of an abstract and the slides of the presentation. (author)
[en] Full text: 183Hg → 183Au decay was studied using the TATRA system at ISOLDE facility. Conversion electrons were detected with the LN2 cooled windowless Si(Li) detector. The tape system was operated at 8.10-8 mbar, therefore no deposition of mist on the surface of cold detector was observed during the run. The FWHM of 1.2 keV for conversion electrons above 150 keV was achieved, which is almost comparable with previous measurement, which employed magnetic spectrometer. Simultaneously, the gamma rays were detected with array of coaxial and novel Broad Energy germanium (BEGe) detectors. Very good energy resolution of BEGe detector was used to construct the level scheme of 183Au, which has large density of excited states at low energy. In the talk, fundaments of the shape coexistence in odd-Au isotopes, technical details of system for detection of conversion electrons and level scheme of 183Au will be presented. Technique of level scheme construction developed in the present study has large potential for studies of isotopes with high level density and can be with success applied to neutron-rich isotopes. (author)