Scientific Opportunities with Fast Fragmentation Beams from RIA
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Probing the states of nucleons in exotic nuclei
Many of the most exotic neutron-proton asymmetric nuclei are produced in relatively small numbers in high-energy fragmentation reactions. They are produced as fast secondary beams with energies of 100 MeV per nucleon or more. Developments made and recent results that both exploit and assess fast oneand two-nucleon removal reactions from such secondary beams are reviewed. This includes very rece...
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The R&D project to study nuclear fragmentation using emulsion in attempt to improve the accuracy of dose calculation in carbon ion radiotherapy has been carried out at NIRS-HIMAC since 2003. Based on the developed techniques, we are accumulating experimental data of fragmentation reactions for various beams and target Preprint submitted to Elsevier Science 11 December 2008 ha l-0 02 77 22 9, v ...
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The most exotic neutron-proton asymmetric nuclei are produced most efficiently in high-energy fragmentation reactions. These exotic nuclei are produced as fast secondary beams with energies of order 100 MeV per nucleon or greater, and hence v/c > 0.3, often with relatively low intensities. For such beams one can exploit both the detection efficiency and the cross sections for fast oneand two-nu...
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Fast beams of exotic nuclei produced in fragmentation reactions were used to study nuclei beyond the drip line, where in particular the structure of unbound N = 7 isotopes was explored. An s-wave ground state was established in 10Li and observed for the first time in 9He. A coincidence experiment with γ-rays confirmed that the s-state in 10Li is indeed the ground state. Systematics of proton se...
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To design appropriate shieldings for heavy–ion accelerators the angular and energy distribution of emitted fragments, especially of neutrons, produced by relativistic heavy–ion beams stopping accidentally in components of the beam line has to be known explicitly. Up to now no data concerning the production of neutrons in thick targets are available for projectile ions heavier than Xe and specif...
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