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Journal Articles

Towards saturation of the electron-capture delayed fission probability; The New isotopes $$^{240}$$Es and $$^{236}$$Bk

Konki, J.*; Khuyagbaatar, J.*; Uusitalo, J.*; Greenlees, P. T.*; Auranen, K.*; Badran, H.*; Block, M.*; Briselet, R.*; Cox, D. M.*; Dasgupta, M.*; et al.

Physics Letters B, 764, p.265 - 270, 2017/01

 Times Cited Count:13 Percentile:77.72(Astronomy & Astrophysics)

Journal Articles

Short-lived isomers in $$^{192}$$Po and $$^{194}$$Po

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

Physical Review C, 93(6), p.064316_1 - 064316_12, 2016/06

 Times Cited Count:3 Percentile:30.24(Physics, Nuclear)

Journal Articles

Shell evolution beyond $$N$$=40; $$^{69,71,73}$$Cu

Sahin, E.*; Doncel, M.*; Sieja, K.*; De Angelis, G.*; Gadea, A.*; Quintana, B.*; G$"o$rgen, A.*; Modamio, V.*; Mengoni, D.*; Valiente-Dob$'o$n, J. J.*; et al.

Physical Review C, 91(3), p.034302_1 - 034302_9, 2015/03

 Times Cited Count:20 Percentile:82.02(Physics, Nuclear)

Journal Articles

Signature of the Z=82 shell closure in $$alpha$$-decay process

Andreyev, A. N.*; Huyse, M.*; Van Duppen, P.*; Qi, C.*; Liotta, R. J.*; Antalic, S.*; Ackermann, D.*; Franchoo, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; et al.

Physical Review Letters, 110(24), p.242502_1 - 242502_5, 2013/06

 Times Cited Count:72 Percentile:93.19(Physics, Multidisciplinary)

Journal Articles

First prompt in-beam $$gamma$$-ray spectroscopy of a superheavy element; The $$^{256}$$Rf

Rubert, J.*; Dorvaux, O.*; Gall, B. J. P.*; Greenlees, P. T.*; Asfari, Z.*; Piot, J.*; Andersson, L. L.*; Asai, Masato; Cox, D. M.*; Dechery, F.*; et al.

Journal of Physics; Conference Series, 420, p.012010_1 - 012010_10, 2013/03

 Times Cited Count:0 Percentile:0.04

The first prompt in-beam $$gamma$$-ray spectroscopy of a superheavy element, $$^{256}$$Rf, has been performed successfully. A development of an intense isotopically enriched $$^{50}$$Ti beam using the MIVOC method enabled us to perform this experiment. A rotational band up to a spin of 20 $$hbar$$ has been discovered in $$^{256}$$Rf, and its moment of inertia has been extracted. These data suggest that there is no evidence of a significant deformed shell gap at $$Z$$ = 104.

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

Shell-structure and pairing interaction in superheavy nuclei; Rotational properties of the $$Z$$=104 nucleus $$^{256}$$Rf

Greenlees, P. T.*; Rubert, J.*; Piot, J.*; Gall, B. J. P.*; Andersson, L. L.*; Asai, Masato; Asfari, Z.*; Cox, D. M.*; Dechery, F.*; Dorvaux, O.*; et al.

Physical Review Letters, 109(1), p.012501_1 - 012501_5, 2012/07

 Times Cited Count:53 Percentile:88.68(Physics, Multidisciplinary)

Rotational band structure of the $$Z$$=104 nucleus $$^{256}$$Rf has been observed for the first time using an in-beam $$gamma$$-ray spectroscopic technique. This nucleus is the heaviest among the nuclei whose rotational band structure has ever been observed. Thus, the present result provides valuable information on the single-particle shell structure and pairing interaction in the heaviest extreme of nuclei. The deduced moment of inertia indicates that there is no deformed shell gap at $$Z$$=104, which is predicted in a number of current self-consistent mean-field models.

Journal Articles

Alpha-$$gamma$$ decay studies of $$^{253}$$No and its daughter products $$^{253}$$Md, $$^{249}$$Fm

He${ss}$berger, F. P.*; Antalic, S.*; Ackermann, D.*; Kalaninov$'a$, Z.*; Heinz, S.*; Hofmann, S.*; Streicher, B.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; et al.

European Physical Journal A, 48(5), p.75_1 - 75_9, 2012/05

 Times Cited Count:25 Percentile:78.32(Physics, Nuclear)

Journal Articles

Isomeric states in $$^{253}$$No and $$^{253}$$Fm

Antalic, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Heinz, S.*; Hofmann, S.*; Kalaninov$'a$, Z.*; Kindler, B.*; Khuyagbaatar, J.*; Kojouharov, I.*; Kuusiniemi, P.*; et al.

European Physical Journal A, 47(5), p.62_1 - 62_12, 2011/05

 Times Cited Count:28 Percentile:82.99(Physics, Nuclear)

Journal Articles

Decay studies of K isomer in $$^{254}$$No

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

European Physical Journal A, 43(1), p.55 - 66, 2010/01

 Times Cited Count:66 Percentile:95.16(Physics, Nuclear)

Journal Articles

Di-nuclear systems studied with the velocity filter SHIP

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

European Physical Journal A, 38(2), p.227 - 232, 2008/11

 Times Cited Count:23 Percentile:78.73(Physics, Nuclear)

Journal Articles

Decay studies of neutron-deficient lawrencium isotopes

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

European Physical Journal A, 38(2), p.219 - 226, 2008/11

 Times Cited Count:31 Percentile:83.76(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

Isomeric states in $$^{214}$$Th and $$^{213}$$Th

Khuyagbaatar, J.*; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Burkhard, H. G.*; Heinz, S.*; Kindler, B.*; Lisetskiy, A. F.*; Lommel, B.*; et al.

European Physical Journal A, 34(4), p.355 - 361, 2007/12

 Times Cited Count:12 Percentile:64.8(Physics, Nuclear)

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

Studies of $$^{rm 213g,m}$$Ra and $$^{rm 214g,m}$$Ra by $$alpha$$ and $$gamma$$ decay

Kuusiniemi, P.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Hofmann, S.*; Nishio, Katsuhisa; Sulignano, B.*; Kojouharov, I.*; Mann, R.*

European Physical Journal A, 30(3), p.551 - 559, 2006/12

 Times Cited Count:9 Percentile:54.55(Physics, Nuclear)

Decay properties of $$^{214}$$Ra and $$^{213}$$Ra were invesigated by $$alpha$$-$$gamma$$ spectroscopy. The nculei were produced by the fusion raction $$^{170}$$Er($$^{48}$$Ca,$$x$$n)$$^{218-x}$$Ra and $$alpha$$ decay daughter of $$^{217}$$Th produced by $$^{170}$$Er($$^{50}$$Ti,3n). The evaporation residues were separated in flight by the velocity filter SHIP and the $$alpha$$ particle and $$gamma$$ ray were detected by silocon detectors and Ge detectors, respectively, located at the focal plane. In this experiments we found the followings. (1) The $$alpha$$ decay of $$^{213}$$Ra popultaing the excitated sates in $$^{209}$$Rn was coincided with the $$gamma$$ decay. From this data, we have newly assigned spins and parities for the three levels in $$^{209}$$Rn. (2) We have firstly observed the $$alpha$$ transition from the 8$$^{+}$$ isomeric state in $$^{214}$$Ra to the 8$$^{+}$$ isomeric state in $$^{210}$$Rn. The hindrace factor in this transition was determined to be 1.0, confirming that these levels have same spins.

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.

26 (Records 1-20 displayed on this page)