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Carroll, R. J.*; Podolyk, Zs.*; Berry, T.*; Grawe, H.*; Alexander, T.*; Andreyev, A. N.; Ansari, S.*; Borge, M. J. G.*; Brunet, M.*; Creswell, J. R.*; et al.
Physical Review Letters, 125(19), p.192501_1 - 192501_6, 2020/11
Times Cited Count:3 Percentile:47.3(Physics, Multidisciplinary)Berry, T. A.*; Podolyk, Zs.*; Carroll, R. J.*; Lic
, 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:43.31(Astronomy & Astrophysics)Khuyagbaatar, J.*; Yakushev, A.*; Dllmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; Asai, Masato; Block, M.*; Boll, R. A.*; Brand, H.*; Cox, D. M.*; et al.
Physical Review C, 99(5), p.054306_1 - 054306_16, 2019/05
Times Cited Count:14 Percentile:89.48(Physics, Nuclear)We have performed an experiment to synthesize the element 117 (Ts) with the Ca+
Bk fusion reaction. Four
-decay chains attributed to the element 117 were observed. Two of them were long decay chains which can be assigned to the one originating from the
decay of
Ts. The other two were short decay chains which are consistent with the one originating from the
decay of
Ts. We have compared the present results with the literature data, and found that our present results mostly confirmed the literature data, leading to the firm confirmation of the synthesis of the element 117.
Forsberg, U.*; Rudolph, D.*; Andersson, L.-L.*; Di Nitto, A.*; Dllmann, Ch. E.*; Fahlander, C.*; Gates, J. M.*; Golubev, P.*; Gregorich, K. E.*; Gross, C. J.*; et al.
Nuclear Physics A, 953, p.117 - 138, 2016/09
Times Cited Count:33 Percentile:92.7(Physics, Nuclear)Alpha-decay chains observed in the element-115 production reactions of Ca +
Am were investigated using a new data set consisting of our recently reported data obtained at GSI and previously reported ones at Dubna and LBNL. Short decay chains of recoil-
-(
)-fission type, fourteen of which were observed, and some of which were interpreted as the 2-neutron evaporation products
Mc, have been reassigned. It is plausible that most of them were assigned to the 3-neutron evaporation products
Mc whose decay chain would on the way have branches of EC decays followed by fission.
Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; Dllmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; et al.
Journal of Radioanalytical and Nuclear Chemistry, 303(2), p.1185 - 1190, 2015/02
Times Cited Count:6 Percentile:51.48(Chemistry, Analytical)Thirty correlated -decay chains of element 115 were observed, which were consistent with previous observations interpreted as the decay chain of
115. GEANT4 Monte-Carlo simulations were performed to reproduce high-resolution
-photon coincidence results, which allows one to propose Q
values and excitation schemes of the superheavy nuclei with unprecedented precision.
Khuyagbaatar, J.*; Yakushev, A.*; Dllmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; Asai, Masato; Block, M.*; Boll, R. A.*; Brand, H.*; Cox, D. M.*; et al.
Physical Review Letters, 112(17), p.172501_1 - 172501_5, 2014/05
Times Cited Count:182 Percentile:98.56(Physics, Multidisciplinary)The superheavy element with atomic number 117 was produced in the Ca +
Bk fusion reaction using the gas-filled recoil separator TASCA at GSI in Germany. This result verified the previous result of the discovery of new element 117 reported by Flerov Laboratory of Nuclear Reactions in Russia, which makes certain the synthesis and discovery of element 117 in human history. On the other hand, the last nucleus in the
decay chain from the element 117 was assigned to be the unknown nucleus
Lr instead of the previously reported
Db, and
Db was found to be the
-decaying nucleus with very long half-life.
Forsberg, U.*; Rudolph, D.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; Dllmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; et al.
EPJ Web of Conferences, 66, p.02036_1 - 02036_4, 2014/03
Times Cited Count:5 Percentile:84.63A focal-plane Si detector setup applied to the spectroscopy of the element 115 -decay chains was reported. Results of the digital signal analysis for preamplifier signals and of the event-by-event
-energy loss correction analysis were presented. The detectors consist of five double-sided Si strip detectors (DSSSD) arranged as a box, and signals from one side of the detector at the bottom of the box were digitally processed. Energy losses of
particles detected by two Si detectors at the bottom and a side differs event-by-event, because each
particle passed through two dead layers with a certain tilted angle. By correcting for the energy loss of each
event using the angle of the
-particle emission extracted from the detected positions, we succeeded in improving the
energy resolution significantly.
Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; Dllmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; et al.
Acta Physica Polonica B, 45(2), p.263 - 272, 2014/02
Times Cited Count:19 Percentile:74.98(Physics, Multidisciplinary)Produced in the reaction of Ca beam with an
Am target, thirty correlated
-decay chains were observed. Observed decay chains are consistent with a previously reported decay chain, which confirms the identification of the element 115. In addition, an
-photon coincidence measurement was performed, and
rays as well as X-ray candidates were observed in this decay chain. The
-ray observation in the heaviest region of superheavy nuclei brings a big progress in the superheavy nuclear structure studies.
Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L. L.*; Di Nitto, A.*; Dllmann, Ch. E.*; Gates, J. M.*; Gregorich, K. E.*; et al.
Physical Review Letters, 111(11), p.112502_1 - 112502_5, 2013/09
Times Cited Count:113 Percentile:96.46(Physics, Multidisciplinary)Detlefs, B.*; Wilkins, S. B.*; Caciuffo, R.*; Paixo, J. A.*; Kaneko, Koji; Honda, Fuminori*; Metoki, Naoto; Bernhoeft, N.*; Rebizant, J.*; Lander, G. H.*
Physical Review B, 77(2), p.024425_1 - 024425_10, 2008/01
Times Cited Count:16 Percentile:58.05(Materials Science, Multidisciplinary)We report a resonant X-ray scattering study of the antiferromagnetic neptunium compounds NpCoGa and NpRhGa
. Large resonant signals of magnetic dipole character are observed below the N
el temperatures. The signals at the Np edges confirm the behavior determined previously from neutron diffraction. On application of a magnetic field of 9 T along the [010] direction in NpRhGa
, we observe a change in the population of different [110]-type domains. We also observe a magnetic dipole signal at the Ga &K& edge, similarly to the reported UGa
case, that can be interpreted within a semilocalized model as an orbital polarization of the Ga 4
states induced via strong hybridization with the Np 5
valence band. Quantitative analysis of the signal shows that the Ga dipole on the two different Ga sites follows closely the Np magnetic moment reorientation in NpRhGa
. The ratios of the signals on the two inequivalent Ga sites are not the same for the different compounds.
Podolyk, Zs.*; Steer, S. J.*; Pietri, S.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; G
rska, M.*; Gerl, J.*; et al.
European Physical Journal; Special Topics, 150(1), p.165 - 168, 2007/11
Times Cited Count:10 Percentile:54.66(Physics, Multidisciplinary)Relativistic energy projectile fragmentation of Pb has been used to produce a range of exotic nuclei. The nuclei of interest were studied by detecting delayed
rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich
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
and
states in
Tb and
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.
Pietri, S.*; Regan, P. H.*; Podolyk, Zs.*; Rudolph, D.*; Steer, S. J.*; Garnsworthy, A. B.*; Werner-Malento, E.*; Hoischen, R.*; G
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:91 Percentile:98.62(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 -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.
Hender, T. C.*; Wesley, J. C.*; Bialek, J.*; Bondeson, A.*; Boozer, A. H.*; Buttery, R. J.*; Garofalo, A.*; Goodman, T. P.*; Granetz, R. S.*; Gribov, Y.*; et al.
Nuclear Fusion, 47(6), p.S128 - S202, 2007/06
Times Cited Count:805 Percentile:100(Physics, Fluids & Plasmas)no abstracts in English
Regan, P. H.*; Garnsworthy, A. B.*; Pietri, S.*; Caceres, L.*; Grska, M.*; Rudolph, D.*; Podoly
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:91.07(Physics, Nuclear)Relativistic energy projectile fragmentation of Pb has been used to produce neutron-rich nuclei with N
126. The nuclei of interest were studied by detecting delayed
rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich
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.
Metoki, Naoto; Kaneko, Koji; Raymond, S.*; Sanchez, J. P.*; Piekarz, P.*; Parlinski, K.*; Ole, A. M.*; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; et al.
Physica B; Condensed Matter, 378-380, p.1003 - 1004, 2006/05
Times Cited Count:12 Percentile:50.74(Physics, Condensed Matter)no abstracts in English
Kuzushita, Kaori*; Ishii, Kenji; Wilkins, S. B.*; Janousova, B.*; Inami, Toshiya; Owada, Kenji; Tsubota, Masami; Murakami, Yoichi; Kaneko, Koji; Metoki, Naoto; et al.
Physical Review B, 73(10), p.104431_1 - 104431_5, 2006/03
Times Cited Count:7 Percentile:36.11(Materials Science, Multidisciplinary)We report a resonant X-ray scattering study of antiferromagnetic uranium compounds UGa
(
=Ni, Pd, and Pt) at the Ga
-edge. A large resonant signal is observed below the N
el temperatures. The azimuth dependence in both
-
and
-
polarization channels establishes that the resonant signal has the symmetry of the magnetic dipole. This resonance with the band electrons is interpreted within a semi-localized model as an orbital polarization of the Ga
states induced through strong hybridization with U
valence level. These results demonstrate that resonant magnetic X-ray scattering at the anions, taken in combination with symmetry arguments, can be used to determine the configuration of the U
moments and provide information about the hybridization.
Metoki, Naoto; Kaneko, Koji; Colineau, E.*; Javorsk, P.*; Aoki, Dai*; Homma, Yoshiya*; Boulet, P.*; Wastin, F.*; Shiokawa, Yoshinobu; Bernhoeft, N.*; et al.
Physical Review B, 72(1), p.014460_1 - 014460_8, 2005/07
Times Cited Count:50 Percentile:84.49(Materials Science, Multidisciplinary)no abstracts in English
Honda, Fuminori; Metoki, Naoto; Kaneko, Koji; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Shiokawa, Yoshinobu; Onuki, Yoshichika; Colineau, E.*; Bernhoeft, N.*; et al.
Physica B; Condensed Matter, 359-361, p.1147 - 1149, 2005/06
Times Cited Count:26 Percentile:70.22(Physics, Condensed Matter)We have succeeded in growing single crystalline samples of NpTGa (T: Fe, Co, Ni). Magnetic structures of these compounds have been studied by neutron diffraction experiment. We summarize the results of the unusual variety of magnetic structure occurred in NpTGa
and discuss in terms of electronic structural point of view.
Kuzushita, Kaori; Ishii, Kenji; Owada, Kenji; Murakami, Yoichi; Kaneko, Koji; Metoki, Naoto; Lander, G. H.; Ikeda, Shugo; Haga, Yoshinori; Onuki, Yoshichika
Physica B; Condensed Matter, 359-361, p.1045 - 1047, 2005/04
Times Cited Count:2 Percentile:12.09(Physics, Condensed Matter)In UNiGa which shows antiferromagnetic ordering below
= 86 K with 0.75
/U, we observed resonant magnetic reflections using synchrotron X-ray tuned the incident photon energy near M
-edge of U and K-edge of Ga, and the large enhancement about 10
at just resonant energy of Ga K-edge although Ga is a nonmagnetic element. It is considered that the origin of the magnetic resonant scattering intensity at Ga K-edge is the Ga-4
orbital polarization induced by the 5
orbital polarization at the neighboring U atom due to the hybridization.
Kaneko, Koji; Metoki, Naoto; Bernhoeft, N.*; Lander, G. H.; Ishii, Yoshinobu; Ikeda, Shugo; Tokiwa, Yoshifumi; Haga, Yoshinori; Onuki, Yoshichika
Physical Review B, 68(21), p.214419_1 - 214419_9, 2003/12
Times Cited Count:58 Percentile:89.12(Materials Science, Multidisciplinary)The crystal structure, lattice strain due to the antiferromagnetic ordering and magnetic form factor in the itinerant 5 compounds UTGa
(T: Ni, Pd, Pt) have been studied by neutron scattering. High-resolution powder diffraction revealed that the tetragonality of the U-Ga layers increases with the ionic radius of the transition metal element T. The observed antiferromagnetic reflections can be well explained with the N
el-type structure for UNiGa
, whereas UPtGa
has the antiferromagnetic stacking of the ferromagnetically ordered uranium moments in the
-plane. The orbital contributions in the magnetic form factor are reduced from the free ion value, especially for UNiGa
. This suppression shows a strong correlation with the bulk magnetic susceptibility. The tetragonality of the U-Ga layers is a sensitive measure of the nearest neighbour interaction, the lattice anomaly, and the orbital contribution and suggests that orbital degrees of freedom may play an important role for the magnetic properties in these itinerant 5
antiferromagnets.