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Journal Articles

Fine structure in the $$alpha$$ decay of $$^{223}$$U

Sun, M. D.*; Liu, Z.*; Huang, T. H.*; Zhang, W. Q.*; Andreyev, A. N.; Ding, B.*; Wang, J. G.*; Liu, X. Y.*; Lu, H. Y.*; Hou, D. S.*; et al.

Physics Letters B, 800, p.135096_1 - 135096_5, 2020/01

 Times Cited Count:6 Percentile:89.19(Astronomy & Astrophysics)

Journal Articles

Investigation of the $$Delta$$$$n$$ = 0 selection rule in Gamow-Teller transitions; The $$beta$$-decay of $$^{207}$$Hg

Berry, T. A.*; Podoly$'a$k, Zs.*; Carroll, R. J.*; Lic$u{a}$, R.*; Grawe, H.*; Timofeyuk, N. K.*; Alexander, T.*; Andreyev, A. N.; Ansari, S.*; Borge, M. J. G.*; et al.

Physics Letters B, 793, p.271 - 275, 2019/06

 Times Cited Count:3 Percentile:52.47(Astronomy & Astrophysics)

Journal Articles

A New Standard DNA Damage (SDD) data format

Schuemann, J.*; McNamara, A. L.*; Warmenhoven, J. W.*; Henthorn, N. T.*; Kirkby, K.*; Merchant, M. J.*; Ingram, S.*; Paganetti, H.*; Held, K. D.*; Ramos-Mendez, J.*; et al.

Radiation Research, 191(1), p.76 - 93, 2019/01

 Times Cited Count:34 Percentile:97.99(Biology)

We propose a new Standard DNA Damage (SDD) data format to unify the interface between the simulation of damage induction in DNA and the biological modelling of DNA repair processes, and introduce the effect of the environment (molecular oxygen or other compounds) as a flexible parameter. Such a standard greatly facilitates inter-model comparisons, providing an ideal environment to tease out model assumptions and identify persistent, underlying mechanisms. Through inter-model comparisons, this unified standard has the potential to greatly advance our understanding of the underlying mechanisms of radiation-induced DNA damage and the resulting observable biological effects when radiation parameters and/or environmental conditions change.

Journal Articles

The Application of radiochronometry during the 4th collaborative materials exercise of the nuclear forensics international technical working group (ITWG)

Kristo, M. J.*; Williams, R.*; Gaffney, A. M.*; Kayzar-Boggs, T. M.*; Schorzman, K. C.*; Lagerkvist, P.*; Vesterlund, A.*; Rameb$"a$ck, H.*; Nelwamondo, A. N.*; Kotze, D.*; et al.

Journal of Radioanalytical and Nuclear Chemistry, 315(2), p.425 - 434, 2018/02

 Times Cited Count:6 Percentile:72.04(Chemistry, Analytical)

In a recent international exercise, 10 international nuclear forensics laboratories successfully performed radiochronometry on three low enriched uranium oxide samples, providing 12 analytical results using three different parent-daughter pairs serving as independent chronometers. The vast majority of the results were consistent with one another and consistent with the known processing history of the materials. In general, for these particular samples, mass spectrometry gave more accurate and more precise analytical results than decay counting measurements. In addition, the concordance of the $$^{235}$$U-$$^{231}$$Pa and $$^{234}$$U-$$^{230}$$Th chronometers confirmed the validity of the age dating assumptions, increasing confidence in the resulting conclusions.

Journal Articles

EXILL; A High-efficiency, high-resolution setup for $$gamma$$-spectroscopy at an intense cold neutron beam facility

Jentschel, M.*; Blanc, A.*; de France, G.*; K$"o$ster, U.*; Leoni, S.*; Mutti, P.*; Simpson, G.*; Soldner, T.*; Ur, C.*; Urban, W.*; et al.

Journal of Instrumentation (Internet), 12(11), p.P11003_1 - P11003_33, 2017/11

 Times Cited Count:27 Percentile:86.8(Instruments & Instrumentation)

Journal Articles

Shell evolution beyond $$Z$$=28 and $$N$$=50; Spectroscopy of $$^{81,82,83,84}$$Zn

Shand, C. M.*; Podoly$'a$k, Zs.*; G$'o$rska, M.*; Doornenbal, P.*; Obertelli, A.*; Nowacki, F.*; Otsuka, T.*; Sieja, K.*; Tostevin, J. A.*; Tsunoda, T.*; et al.

Physics Letters B, 773, p.492 - 497, 2017/10

 Times Cited Count:18 Percentile:88.47(Astronomy & Astrophysics)

Journal Articles

Possible antimagnetic rotation band and neutron alignment in $$^{101}$$Pd

Sugawara, Masahiko*; Hayakawa, Takehito; Oshima, Masumi*; Toh, Yosuke; Osa, Akihiko; Matsuda, Makoto; Shizuma, Toshiyuki; Hatsukawa, Yuichi; Kusakari, Hideshige*; Morikawa, Tsuneyasu*; et al.

Physical Review C, 86(3), p.034326_1 - 034326_11, 2012/09

 Times Cited Count:16 Percentile:68.96(Physics, Nuclear)

High spin states of $$^{101}$$Pd have been studied through in-beam $$gamma$$-ray spectroscopy by using the reaction $$^{68}$$Zn ($$^{37}$$Cl, 1$$p$$3$$n$$). The band based on the $$h$$$$_{11/2}$$ neutron orbital has been extended to higher-spin states, and the band based on the $$d$$$$_{5/2}$$ neutron orbital has been somewhat revised. Many transitions decaying to these bands have been observed and consequently, several side bands have been established. Electric dipole transitions from the $$h$$$$_{11/2}$$ band to the $$d$$$$_{5/2}$$ band have been also observed. The structure of the $$h$$$$_{11/2}$$ band was discussed from the viewpoint of "antimagnetic rotation" based on a semiclassical particle plus rotor model taking neutron alignments into account.

Journal Articles

Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a $$^{208}$$Pb beam

Steer, S. J.*; Podoly$'a$k, Z.*; Pietri, S.*; G$'o$rska, M.*; Grawe, H.*; Maier, K.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; et al.

Physical Review C, 84(4), p.044313_1 - 044313_22, 2011/10

 Times Cited Count:54 Percentile:94.23(Physics, Nuclear)

Heavy neutron-rich nuclei were populated via the fragmentation of a E/A=1 GeV $$_{82}^{208}$$Pb beam. Secondary fragments were separated and identified and subsequently implanted in a passive stopper. By the detection of delayed $$gamma$$ rays, isomeric decays associated with these nuclei have been identified. A total of 49 isomers were detected, with the majority of them observed for the first time. Possible level schemes are constructed and the structure of the nuclei discussed. To aid the interpretation, shell-model as well as BCS calculations were performed.

Journal Articles

Weakly deformed oblate structures in $$^{198}_{76}$$Os$$_{122}$$

Podoly$'a$k, Zs.*; Steer, S. J.*; Pietri, S.*; Xu, F. R.*; Liu, H. J.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; G$'o$rska, M.*; et al.

Physical Review C, 79(3), p.031305_1 - 031305_4, 2009/03

 Times Cited Count:31 Percentile:84.62(Physics, Nuclear)

$$gamma$$ rays de-exciting isomeric states in the neutron-rich nucleus $$_{76}^{198}$$Os$$_{122}$$ have been observed following relativistic projectile fragmentation of a 1 GeV per nucleon $$^{208}$$Pb beam. The ground-state band has properties compatible with oblate deformation. The evolution of the structure of Os isotopes characterized by sudden prolate-oblate shape change is discussed and contrasted with the smooth change known in the Pt chain.

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:79.13(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

Neutron-proton pairing competition in $$N=Z$$ nuclei; Metastable state decays in the proton dripline nuclei $$^{82}_{41}$$Nb and $$^{86}_{43}$$Tc

Garnsworthy, A. B.*; Regan, P. H.*; C$'a$ceres, L.*; Pietri, S.*; Sun, Y.*; Rudolph, D.*; G$'o$rska, M.*; Podoly$'a$k, Z.*; Steer, S. J.*; Hoischen, R.*; et al.

Physics Letters B, 660(4), p.326 - 330, 2008/02

 Times Cited Count:23 Percentile:79.13(Astronomy & Astrophysics)

The low-lying structures of the self-conjugate ($$N=Z$$) nuclei $$^{82}_{41}$$Nb and $$^{86}_{43}$$Tc have been investigated using isomeric-decay spectroscopy following the projectile fragmentation of a $$^{107}$$Ag beam. These represent the heaviest odd-odd $$N=Z$$ nuclei in which internal decays have been identified to date. The resulting level schemes shed light on the shape evolution along the $$N=Z$$ line between the doubly-magic systems $$^{56}_{28}$$Ni and $$^{100}_{50}$$Sn and support a preference for $$T=1$$ states in $$T_z=0$$ odd-odd nuclei at low excitation energies associated with a $$T=1$$ neutron-proton pairing gap. Comparison with Projected Shell Model calculations suggests that the decay in $$^{82}$$Nb may be interpreted as an isospin-changing $$K$$ isomer.

Journal Articles

Isomeric decay studies around $$^{204}$$Pt and $$^{148}$$Tb

Podoly$'a$k, Zs.*; Steer, S. J.*; Pietri, S.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; G$'o$rska, M.*; Gerl, J.*; et al.

European Physical Journal; Special Topics, 150(1), p.165 - 168, 2007/11

 Times Cited Count:10 Percentile:55.18(Physics, Multidisciplinary)

Relativistic energy projectile fragmentation of $$^{208}$$Pb has been used to produce a range of exotic nuclei. The nuclei of interest were studied by detecting delayed $$gamma$$ rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich $$^{204}$$Pt N=126 nucleus, following internal decay of two isomeric states, was obtained for the first time. In addition, decays from the previously reported isomeric $$I=27hbar$$ and $$I=(49/2)hbar$$ states in $$^{148}$$Tb and $$^{147}$$Gd, respectively, have been observed. These isomeric decays represent the highest discrete states observed to date following a prejectile fragmentation reaction, and opens up the possibilty of doing "high-spin physics" using this technique.

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

Recent results in fragmentation isomer spectroscopy with rising

Pietri, S.*; Regan, P. H.*; Podoly$'a$k, Zs.*; Rudolph, D.*; Steer, S. J.*; Garnsworthy, A. B.*; Werner-Malento, E.*; Hoischen, R.*; G$'o$rska, M.*; Gerl, J.*; et al.

Nuclear Instruments and Methods in Physics Research B, 261(1-2), p.1079 - 1083, 2007/08

 Times Cited Count:89 Percentile:98.67(Instruments & Instrumentation)

The first results from the stopped beam RISING experimental campaign performed at the GSI laboratory in Darmstadt, Germany, are presented. RISING constitutes a major new experimental program in European nuclear structure physics research aimed at using relativistic energy (typically around 1 GeV per nucleon) projectile fragmentation reactions to populate nuclei with highly exotic proton-to-neutron ratios compared to the line of beta stability. In its high-efficiency stopped beam configuration, the RISING $$gamma$$-ray spectrometer consists of 105 individual germanium crystals which view a focal plane in which the exotic nuclei are brought to rest. Here, decays from metastable states with half-lives in the nano to milliseconds range can be observed. Results of initial commissioning experiments are also shown and details of the planned future experimental program are given.

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:232 Percentile:99.69(Physics, Nuclear)

Journal Articles

Isomer spectroscopy using relativistic projectile fragmentation at the N=Z line for A$$sim$$80$$rightarrow$$90

Regan, P. H.*; Garnsworthy, A. B.*; Pietri, S.*; Caceres, L.*; G$'o$rska, M.*; Rudolph, D.*; Podoly$'a$k, Zs.*; Steer, S. J.*; Hoischen, R.*; Gerl, J.*; et al.

Nuclear Physics A, 787(1), p.491c - 498c, 2007/05

 Times Cited Count:42 Percentile:91.45(Physics, Nuclear)

Relativistic energy projectile fragmentation of $$^{208}$$Pb has been used to produce neutron-rich nuclei with N$$approx$$126. The nuclei of interest were studied by detecting delayed $$gamma$$ rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich $$^{204}$$Pt N=126 nucleus, following internal decay of two isomeric states, was obtained for the first time. Raw experimental data and shell-model calculations are presented.

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

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:57 Percentile:93.69(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

A New isomer in $$^{136}$$Ba populated by deep inelastic collisions

Shizuma, Toshiyuki; Gan, Z. G.*; Ogawa, Kengo*; Nakada, Hitoshi*; Oshima, Masumi; Toh, Yosuke; Hayakawa, Takehito; Hatsukawa, Yuichi; Sugawara, Masahiko*; Utsuno, Yutaka; et al.

European Physical Journal A, 20(2), p.207 - 210, 2004/04

 Times Cited Count:13 Percentile:71.74(Physics, Nuclear)

Excited states in $$^{136}$$Ba, populated in deep-inelastic collisions by the interaction of 450-MeV $$^{82}$$Se ions with a $$^{139}$$La target, have been studied by means of in-beam $$gamma$$-ray spectroscopy. A new isomer with $$I^pi=(10^+)$$ has been identified at an excitation energy of $$E_x=3.357$$ MeV. The half-life was determined as $$T_{1/2}=94pm10$$ ns. The extracted $$B(E2)$$ value is much smaller than those in $$^{132}$$Te and $$^{134}$$Xe. This hindrance is investigated by a shell model calculation.

22 (Records 1-20 displayed on this page)