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Journal Articles

Orientation effects of deformed $$^{238}$$U target nuclei on the fusion probability for the heavy element synthesis

Nishio, Katsuhisa; Hofmann, S.*; Ikezoe, Hiroshi; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; et al.

Nuclear Physics A, 805(1-4), p.516 - 518, 2008/06

Journal Articles

Measurement of evaporation residue and fission cross sections of the reaction $$^{30}$$Si + $$^{238}$$U at subbarrier energies

Nishio, Katsuhisa; Hofmann, S.*; Ikezoe, Hiroshi; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; et al.

Journal of Nuclear and Radiochemical Sciences, 8(2), p.73 - 78, 2007/10

https://doi.org/10.14494/jnrs2000.8.73

Journal Articles

Measurement of evaporation residue cross-sections of the reaction $$^{30}$$Si + $$^{238}$$U at subbarrier energies

Nishio, Katsuhisa; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; Ikezoe, Hiroshi; et al.

AIP Conference Proceedings 891, p.71 - 79, 2007/03

https://doi.org/10.1063/1.2713502

Seaborgium isotopes were produced in the fusion reaction $$^{30}$$Si + $$^{238}$$U as evaporation residues (ERs), and the cross sections were determined. The experiment was carried out at GSI in Darmstadt, Germany. At the center-of-mass energy of E$$_{c.m.}$$= 144 MeV, three $$alpha$$ decay chains starting from $$^{263}$$Sg were observed, and the corresponding ER cross section was determined to be 67 pb. At the sub-barrier energy of E$$_{c.m.}$$= 133 MeV, three spontaneous fission events of a new isotope $$^{264}$$Sg were detected. The cross section was 10 pb. The half-life of $$^{264}$$Sg was determined to be 120 ms. The ER cross sections were compared with a statistical model calculation. In the fusion process, the coupled channel calculation taking into account the prolate deformation of $$^{238}$$U was adopted to determine the capture cross section. The calculated capture cross section agrees well with the fission cross section of $$^{30}$$Si + $$^{238}$$U obtained at the JAEA tandem accelerator. The measured cross section of $$^{264}$$Sg at the sub-barrier energy is factor 10$$^{4}$$ larger than the calculation based on the one-dimensional model in the fusion process, showing the fusion enhancement caused by the deformation of $$^{238}$$U. However, disagreement with the calculation suggests the presence of quasi-fission channel. At the above barrier energy of E$$_{c.m.}$$ = 144 MeV, the measured cross section is well reproduced by the calculation. This means that the interaction of $$^{30}$$Si at the equotorial side of $$^{238}$$U has advantage on the fusion process.

Journal Articles

Measurement of evaporation residue cross-sections of the reaction $$^{30}$$Si+$$^{238}$$U at subbarrier energies

Nishio, Katsuhisa; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; Ikezoe, Hiroshi; et al.

European Physical Journal A, 29(3), p.281 - 287, 2006/09

https://doi.org/10.1140/epja/i2006-10091-y
 Times Cited Count：62 Percentile：93.87(Physics, Nuclear)

Seaborgium isotopes were produced in the fusion reaction $$^{30}$$Si + $$^{238}$$U as evaporation residues (ERs), and the cross sections were determined. The experiment was carried out at GSI in Darmstadt, Germany. At the center-of-mass energy of E$$_{c.m.}$$= 144 MeV, three $$alpha$$ decay chains starting from $$^{263}$$Sg were observed, and the corresponding ER cross section was determined to be 67 pb. At the sub-barrier energy of E$$_{c.m.}$$= 133 MeV, three spontaneous fission events of a new isotope $$^{264}$$Sg were detected. The cross section was 10 pb. The half-life of $$^{264}$$Sg was determined to be 120 ms. The ER cross sections were compared with a statistical model calculation. In the fusion process, the coupled channel calculation taking into account the prolate deformation of $$^{238}$$U was adopted to determine the capture cross section. The calculaed capture cross section agrees well with the fission cross section of $$^{30}$$Si + $$^{238}$$U obtained at the JAEA tandem accelerator. The measured cross section of $$^{264}$$Sg at the sub-barrier energy is factor 10$$^{4}$$ larger than the calculation based on the one-dimensional model in the fusion process, showing the fusion enhancement caused by the deformation of $$^{238}$$U. However, disagreement with the calculation suggests the presence of quasi-fission channel. At the above barrier energy of E$$_{c.m.}$$ = 144 MeV, the measured cross section is well reproduced by the calculation. This means that the interaction of $$^{30}$$Si at the equatorial side of $$^{238}$$U has advantage on the fusion process.

Journal Articles

Scattering of $$^{11}$$Be halo nucleus from $$^{209}$$Bi at coulomb barrier

Mazzocco, M.*; Signorini, C.*; Romoli, M.*; De Francesco, A.*; Di Pietro, M.*; Vardaci, E.*; Yoshida, Koichi*; Yoshida, Atsushi*; Bonetti, R.*; De Rosa, A.*; et al.

European Physical Journal A, 28(3), p.295 - 299, 2006/06

https://doi.org/10.1140/epja/i2006-10058-0
 Times Cited Count：46 Percentile：90.38(Physics, Nuclear)

The scattering of the radioactive, weakly bound, halo nucleus $$^{11}$$Be from $$^{209}$$Bi has been studied at 40 MeV. The measurement performed with a low-intensity and a large-emittance secondary beam could be made using an extremely compact, large solid angle ($$sim$$ 2$$pi$$ sr) detecting set-up, based on 8 highly segmented Si telescopes. The $$^{9,11}$$Be scattering angular distributions, as well as their relative reaction cross-sections, resulted to be rather similar. This may suggest that at Coulomb barrier energies the halo structure and the small weakly binding energy of the $$^{11}$$Be projectile have no big influence on the reaction dynamics.

Oral presentation

Production of Sg isotopes in the fusion reaction $$^{30}$$Si + $$^{238}$$U

Nishio, Katsuhisa; Mitsuoka, Shinichi; Ikezoe, Hiroshi; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; et al.

no journal, , 

Seaborgium isotopes were produced in the fusion reaction $$^{30}$$Si + $$^{238}$$U as evaporation residues (ERs), and the cross sections were determined. The experiment was carried out at GSI in Darmstadt, Germany. At the center-of-mass energy of E$$_{c.m.}$$= 144 MeV, three $$alpha$$ decay chains starting from $$^{263}$$Sg were observed, and the corresponding ER cross section was determined to be 67 pb. At the sub-barrier energy of E$$_{c.m.}$$= 133 MeV, three spontaneous fission events of a new isotope $$^{264}$$Sg were detected. The cross section was 10 pb. The half-life of $$^{264}$$Sg was determined to be 120 ms. The ER cross sections were compared with a statistical model calculation. In the fusion process, the coupled channel calculation taking into account the prolate deformation of $$^{238}$$U was adopted to determine the capture cross section. The calculated capture cross section agrees well with the fission cross section of $$^{30}$$Si + $$^{238}$$U obtained at the JAEA tandem accelerator. The measured cross section of $$^{264}$$Sg at the sub-barrier energy is factor 10$$^{4}$$ larger than the calculation based on the one-dimensional model in the fusion process, showing the fusion enhancement caused by the deformation of $$^{238}$$U. However, disagreement with the calculation suggests the presence of quasi-fission channel. At the above barrier energy of E$$_{c.m.}$$ = 144 MeV, the measured cross section is well reproduced by the calculation. This means that the interaction of $$^{30}$$Si at the equotorial side of $$^{238}$$U has advantage on the fusion process.

Oral presentation

Orientation effects of deformed $$^{238}$$U target nuclei on the fusion probability for heavy element synthesis

Nishio, Katsuhisa; Hofmann, S.*; Ikezoe, Hiroshi; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; He${ss}$berger, F. P.*; et al.

no journal, , 

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