Production of Np isotopes from <sup>238</sup>U beam at BigRIPS
ORAL
Abstract
A variety of rare isotope beams with atomic numbers (Z) up to 92 can be produced by the projectile fragmentation and in-flight fission from high intensity U beams at RIBF. In numerous instances of spallation reactions, transitions to channels leading to Z+1 have been observed, and their energy dependence can be perceived qualitatively. In the Pd region, a comprehensive investigation was conducted by Wang et al. It was also found that 234−238Np can be generated by a proton pickup reaction at 1 GeV/u 238U beam by E.Casarejos et al. Owing to the developments of the high-Z beams at BigRIPS, energy dependence of the proton pickup reaction on 238U can be obtained at RIBF. Thus, we conducted an experiment to determine the energy dependence of the production cross section of 237Np.
Secondary beams around Z = 90 were produced by an 238U primary beam with energies of 345 and 250 MeV/u. To validate the production of the 237Np91+, a two dimensional (2D) Gaussian fitting approach was conducted in accordance with the distribution patterns of neighboring ions of 234U90+,235U90+, and 232Pa89+. It is found that Np isotope can be counted with contaminated U/Pa isotopes. The production cross sections of 234-236U and 232-233Pa as well as Np isotopes were derived.
We will report the results of 345MeV/u.
Secondary beams around Z = 90 were produced by an 238U primary beam with energies of 345 and 250 MeV/u. To validate the production of the 237Np91+, a two dimensional (2D) Gaussian fitting approach was conducted in accordance with the distribution patterns of neighboring ions of 234U90+,235U90+, and 232Pa89+. It is found that Np isotope can be counted with contaminated U/Pa isotopes. The production cross sections of 234-236U and 232-233Pa as well as Np isotopes were derived.
We will report the results of 345MeV/u.
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Presenters
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Chihaya Fukushima
- Tokyo City University