Production of neutron-rich surface-ionized nuclides at PARRNe
نویسندگان
چکیده
Yields of neutron-rich isotopes produced by fast neutron induced fission of U were measured at the ISOL set-up Production d Atomes Radioactifs Riches en Neutrons. A surface ion source was used to ionize selectively elements with low ionization potentials. In order to observe also the most n-rich isotopes, the identification was achieved by a combined measurement of band c-rays and b-delayed neutrons. The flux of fast neutrons inducing fission was generated by a 1 lA beam of 26 MeV deuterons stopped in a graphite converter. The target was a standard ISOLDE type UCX /graphite (50 g/cm ) heated by a tantalum oven to about 2050 C. A large variety of radioactive isotopes could be determined quantitatively. Production rates measured for Rb and Cs isotopes are presented here. 2002 Elsevier Science B.V. All rights reserved. PACS: 29.85.Ec; 28.60.þS; 29.25.Rm
منابع مشابه
Rare isotope production near the neutron drip line
The underlying mechanism involved in the production of very neutron-rich nuclides using projectile fragmentation is studied with an abrasion-ablation ~AA! model. The AA model suggests that very neutron-rich nuclides are produced by removing nearly all the required protons in the nonequilibrium abrasion stage, with minimal evaporation of neutrons in the ablation stage—‘‘cold fragmentation.’’ Fur...
متن کاملPhoto-fission for the production of radioactive beams ALTO project
In order to probe neutron rich radioactive noble gases produced by photo-fission, a PARRNe-1 experiment (Production d Atomes Radioactifs Riches en Neutrons) has been carried out at CERN. The incident electron beam of 50 MeV was delivered by the LIL machine: LEP Injector Linac. The experiment allowed us to compare under the same conditions two production methods of radioactive noble gases: fissi...
متن کاملTHE EUROPEAN PHYSICAL JOURNAL A Photofission for the production of radioactive beams: Experimental data from an on-line measurement
A PARRNe 1 experiment (Production d’Atomes Radioactifs Riches en Neutrons) aimed at the production of neutron-rich radioactive noble gases produced by photofission has been performed at CERN. The LEP Pre-Injector (LPI) has been used to deliver a 50 MeV electron beam. The results obtained show clearly that the use of an electron beam to produce neutron-rich fission fragments for futur RNB facili...
متن کاملNew way for the production of heavy neutron-rich nuclei
A new way is found to discover and examine unknown neutron-rich heavy nuclei at the ‘north-east’ part of the nuclear map. This ‘blank spot’ of the nuclear map can be reached neither in fusion–fission reactions nor in fragmentation processes widely used nowadays for the production of new nuclei. The present limits of the upper part of the nuclear map are very close to stability while the unexplo...
متن کاملModel calculations of a two-step reaction scheme for the production of the neutron-rich secondary beams
Actually, the design of more powerful next-generation secondary-beam facilities is being intensively discussed. The main challenge is the production of neutron-rich isotopes, because the neutron-drip line has only been reached for the lightest elements. The traditional way for producing neutronrich nuclei is fission of actinides. Another approach introduced recently, based on cold fragmentation...
متن کامل