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Journal Articles

Review of even element super-heavy nuclei and search for element 120

Hofmann, S.*; Heinz, S.*; Mann, R.*; Maurer, J.*; M$"u$nzenberg, G.*; Antalic, S.*; Barth, W.*; Burkhard, K. G.*; Dahl, L.*; Eberhardt, K.*; et al.

European Physical Journal A, 52(6), p.180_1 - 180_34, 2016/06

 Times Cited Count:122 Percentile:92.05(Physics, Nuclear)

Journal Articles

In-beam fissio study at JAEA for heavy element synthesis

Nishio, Katsuhisa; Ikezoe, Hiroshi; Hofmann, S.*; Ackermann, D.*; Aritomo, Yoshihiro*; Comas, V. F.*; D$"u$llmann, Ch. E.*; Heinz, S.*; Heredia, J. A.*; He${ss}$berger, F. P.*; et al.

AIP Conference Proceedings 1524, p.68 - 72, 2013/04

 Times Cited Count:0 Percentile:0.04

Journal Articles

$$beta$$-delayed fission of $$^{192,194}$$At

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Bianco, L.*; Franchoo, S.*; Heinz, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kalaninov$'a$, Z.*; et al.

Physical Review C, 87(1), p.014317_1 - 014317_8, 2013/01

 Times Cited Count:23 Percentile:81.65(Physics, Nuclear)

Journal Articles

The Reaction $$^{48}$$Ca + $$^{248}$$Cm $$rightarrow$$ $$^{296}$$116$$^{*}$$ studied at the GSI-SHIP

Hofmann, S.*; Heinz, S.*; Mann, R.*; Maurer, J.*; Khuyagbaatar, J.*; Ackermann, D.*; Antalic, S.*; Barth, B.*; Block, M.*; Burkhard, H. G.*; et al.

European Physical Journal A, 48(5), p.62_1 - 62_23, 2012/05

 Times Cited Count:136 Percentile:98.62(Physics, Nuclear)

Journal Articles

Investigation of fission properties and evaporation residue measurement in the reactions using $$^{238}$$U target nucleus

Nishio, Katsuhisa; Ikezoe, Hiroshi; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Aritomo, Yoshihiro; Comas, V. F.*; D$"u$llmann, Ch. E.*; Gorshkov, A.*; Graeger, R.*; et al.

EPJ Web of Conferences, 17, p.09005_1 - 09005_4, 2011/10

 Times Cited Count:1 Percentile:48.28

Journal Articles

Nuclear orientation in the reaction $$^{34}$$S+$$^{238}$$U and synthesis of the new isotope $$^{268}$$Hs

Nishio, Katsuhisa; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Aritomo, Yoshihiro; Comas, V. F.*; D$"u$llmann, Ch. E.*; Gorshkov, A.*; Graeger, R.*; et al.

Physical Review C, 82(2), p.024611_1 - 024611_9, 2010/08

 Times Cited Count:75 Percentile:96.19(Physics, Nuclear)

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

Journal Articles

Identification of a K isomer in $$^{252}$$No

Sulignano, B.*; Heinz, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Lommel, B.*; et al.

European Physical Journal A, 33(4), p.327 - 331, 2007/09

 Times Cited Count:72 Percentile:95.99(Physics, Nuclear)

Journal Articles

The Reaction $$^{48}$$Ca+$$^{238}$$U $$rightarrow$$ $$^{286}$$112$$^{*}$$ studied at the GSI-SHIP

Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Burkhard, H. G.*; Comas, V. F.*; Dressler, R.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; He${ss}$berger, F. P.*; et al.

European Physical Journal A, 32(3), p.251 - 260, 2007/06

 Times Cited Count:244 Percentile:99.7(Physics, Nuclear)

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

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

Alpha-$$gamma$$ decay studies of $$^{255}$$Rf, $$^{251}$$No and $$^{247}$$Fm

He${ss}$berger, F. P.*; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; et al.

European Physical Journal A, 30(3), p.561 - 569, 2006/12

 Times Cited Count:48 Percentile:91.35(Physics, Nuclear)

Decay properties of $$^{255}$$Rf, $$^{251}$$No and $$^{247}$$Fm were investigated by measuring the $$alpha$$ and $$gamma$$ decays. The experiment was carried out by using the linear accelerator UNILAC and velocity filter SHIP at GSI. The evaporation residues were separated by the SHIP and implanted into a silicon detector located at the focal plane. The $$alpha$$ decays were detected by the silicon detector itself and the $$gamma$$ rays were detected by Ge detectors. These isotopes were produced by the reaction $$^{207}$$Pb($$^{50}$$Ti, 2n)$$^{255}$$Rf and the $$alpha$$ decay daughters from $$^{255}$$Rf, or by the reaction $$^{206}$$Pb($$^{48}$$Ca, 3n)$$^{251}$$No and the $$alpha$$ decay daughter of $$^{251}$$No. It was found that (1) the 1.0 s isomeric state in $$^{251}$$No is located in the level of 106 keV. (2) The new isomeric state with 2 $$mu$$s was found in $$^{251}$$No, which was directly populated in the reaction $$^{206}$$Pb($$^{48}$$Ca,3n)$$^{251}$$No. The state is located at the level larger than 1700 keV and decays by accompanying two $$gamma$$ rays. These two $$gamma$$-ray energies agreed with the lines which was followed by the $$alpha$$ decay of $$^{255}$$Rf.

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

 Times Cited Count:60 Percentile:93.82(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

Alpha-$$gamma$$ decay studies of $$^{255}$$No

He${ss}$berger, F. P.*; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; et al.

European Physical Journal A, 29(2), p.165 - 173, 2006/08

 Times Cited Count:39 Percentile:88.36(Physics, Nuclear)

Journal Articles

$$alpha$$-decay of the new isotope $$^{187}$$Po; Probing prolate structures beyond the neutron mid-shell at N = 104

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Franchoo, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kojouharov, I.*; Kindler, B.*; Kuusiniemi, P.*; et al.

Physical Review C, 73(4), p.044324_1 - 044324_8, 2006/04

 Times Cited Count:32 Percentile:85.47(Physics, Nuclear)

Journal Articles

$$alpha$$-decay spectroscopy of the new isotope $$^{192}$$At

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Franchoo, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kojouharov, I.*; Kindler, B.*; Kuusiniemi, P.*; et al.

Physical Review C, 73(2), p.024317_1 - 024317_11, 2006/02

 Times Cited Count:24 Percentile:80.02(Physics, Nuclear)

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, , 

Oral presentation

A New isotope $$^{268}$$Hs produced in the subbarrier fusion reaction of $$^{34}$$S+$$^{238}$$U

Nishio, Katsuhisa; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Comas, V. F.*; D$"u$llmann, Ch. E.*; Gorshkov, A.*; Graeger, R.*; Heinz, S.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Nuclear orientation in fusion and synthesis of heavy element at sub-barrier energy

Nishio, Katsuhisa; Ikezoe, Hiroshi; Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Aritomo, Yoshihiro; Comas, V. F.*; D$"u$llmann, Ch. E.*; Gorshkov, A.*; Graeger, R.*; et al.

no journal, , 

Oral presentation

Experimental study on fusion-fission, quasi-fission and multi-nulceon transfer reaction at JAEA

Hirose, Kentaro; Nishio, Katsuhisa; Nishinaka, Ichiro; Makii, Hiroyuki; Ikezoe, Hiroshi*; Orlandi, R.; L$'e$guillon, R.; Tsukada, Kazuaki; Asai, Masato; Nagame, Yuichiro; et al.

no journal, , 

no abstracts in English

21 (Records 1-20 displayed on this page)