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Journal Articles

Competition between allowed and first-forbidden $$beta$$ decay; The Case of $$^{208}$$Hg $$rightarrow$$ $$^{208}$$Tl

Carroll, R. J.*; Podoly$'a$k, 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)

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:43.31(Astronomy & Astrophysics)

Journal Articles

Fusion reaction $$^{48}$$Ca+$$^{249}$$Bk leading to formation of the element Ts (Z=117)

Khuyagbaatar, J.*; Yakushev, A.*; D$"u$llmann, 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

AA2019-0039.pdf:5.03MB

 Times Cited Count:14 Percentile:89.48(Physics, Nuclear)

We have performed an experiment to synthesize the element 117 (Ts) with the $$^{48}$$Ca+$$^{249}$$Bk fusion reaction. Four $$alpha$$-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 $$alpha$$ decay of $$^{294}$$Ts. The other two were short decay chains which are consistent with the one originating from the $$alpha$$ decay of $$^{293}$$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.

Journal Articles

Recoil-$$alpha$$-fission and recoil-$$alpha$$-$$alpha$$-fission events observed in the reaction $$^{48}$$Ca + $$^{243}$$Am

Forsberg, U.*; Rudolph, D.*; Andersson, L.-L.*; Di Nitto, A.*; D$"u$llmann, 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 $$^{48}$$Ca + $$^{243}$$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-$$alpha$$-($$alpha$$)-fission type, fourteen of which were observed, and some of which were interpreted as the 2-neutron evaporation products $$^{289}$$Mc, have been reassigned. It is plausible that most of them were assigned to the 3-neutron evaporation products $$^{288}$$Mc whose decay chain would on the way have branches of EC decays followed by fission.

Journal Articles

Selected spectroscopic results on element 115 decay chains

Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; D$"u$llmann, 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 $$alpha$$-decay chains of element 115 were observed, which were consistent with previous observations interpreted as the decay chain of $$^{288}$$115. GEANT4 Monte-Carlo simulations were performed to reproduce high-resolution $$alpha$$-photon coincidence results, which allows one to propose Q$$_{alpha}$$ values and excitation schemes of the superheavy nuclei with unprecedented precision.

Journal Articles

$$^{48}$$Ca + $$^{249}$$Bk fusion reaction leading to element Z = 117; Long-lived $$alpha$$-decaying $$^{270}$$Db and discovery of $$^{266}$$Lr

Khuyagbaatar, J.*; Yakushev, A.*; D$"u$llmann, 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 $$^{48}$$Ca + $$^{249}$$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 $$alpha$$ decay chain from the element 117 was assigned to be the unknown nucleus $$^{266}$$Lr instead of the previously reported $$^{270}$$Db, and $$^{270}$$Db was found to be the $$alpha$$-decaying nucleus with very long half-life.

Journal Articles

Spectroscopic tools applied to element Z = 115 decay chains

Forsberg, U.*; Rudolph, D.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; D$"u$llmann, 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:84.63

A focal-plane Si detector setup applied to the spectroscopy of the element 115 $$alpha$$-decay chains was reported. Results of the digital signal analysis for preamplifier signals and of the event-by-event $$alpha$$-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 $$alpha$$ particles detected by two Si detectors at the bottom and a side differs event-by-event, because each $$alpha$$ particle passed through two dead layers with a certain tilted angle. By correcting for the energy loss of each $$alpha$$ event using the angle of the $$alpha$$-particle emission extracted from the detected positions, we succeeded in improving the $$alpha$$ energy resolution significantly.

Journal Articles

Alpha-photon coincidence spectroscopy along element 115 decay chains

Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L.-L.*; Di Nitto, A.*; D$"u$llmann, 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 $$^{48}$$Ca beam with an $$^{243}$$Am target, thirty correlated $$alpha$$-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 $$alpha$$-photon coincidence measurement was performed, and $$gamma$$ rays as well as X-ray candidates were observed in this decay chain. The $$gamma$$-ray observation in the heaviest region of superheavy nuclei brings a big progress in the superheavy nuclear structure studies.

Journal Articles

Spectroscopy of element 115 decay chains

Rudolph, D.*; Forsberg, U.*; Golubev, P.*; Sarmiento, L. G.*; Yakushev, A.*; Andersson, L. L.*; Di Nitto, A.*; D$"u$llmann, 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)

Journal Articles

Resonant X-ray scattering study of NpRhGa$$_5$$ and NpCoGa$$_5$$

Detlefs, B.*; Wilkins, S. B.*; Caciuffo, R.*; Paix$~a$o, 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$$_5$$ and NpRhGa$$_5$$. Large resonant signals of magnetic dipole character are observed below the N$'e$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$$_5$$, 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$$_3$$ case, that can be interpreted within a semilocalized model as an orbital polarization of the Ga 4$$p$$ states induced via strong hybridization with the Np 5$$f$$ 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$$_5$$. The ratios of the signals on the two inequivalent Ga sites are not the same for the different compounds.

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:54.66(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

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: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 $$gamma$$-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

Progress in the ITER physics basis, 3; MHD stability, operational limits and disruptions

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

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:91.07(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

Phonons in UCoGa$$_{5}$$

Metoki, Naoto; Kaneko, Koji; Raymond, S.*; Sanchez, J. P.*; Piekarz, P.*; Parlinski, K.*; Ole$'s$, 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

Journal Articles

Induced orbital polarization of Ga ligand atoms in U$$T$$Ga$$_5$$ ($$T$$=Ni, Pd, and Pt)

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 U$$T$$Ga$$_5$$ ($$T$$=Ni, Pd, and Pt) at the Ga $$K$$-edge. A large resonant signal is observed below the N$'e$el temperatures. The azimuth dependence in both $$pi$$-$$pi'$$ and $$pi$$-$$sigma'$$ 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 $$4p$$ states induced through strong hybridization with U $$5f$$ 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 $$5f$$ moments and provide information about the hybridization.

Journal Articles

Magnetic structure and metamagnetism in single crystals of NpCoGa$$_{5}$$

Metoki, Naoto; Kaneko, Koji; Colineau, E.*; Javorsk$'y$, 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

Journal Articles

Magnetic structure of NpTGa$$_{5}$$(T: Fe, Co, Ni)

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$$_{5}$$ (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$$_{5}$$ and discuss in terms of electronic structural point of view.

Journal Articles

Resonant X-ray scattering study of UNiGa$$_5$$

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$$_5$$ which shows antiferromagnetic ordering below $textit{T$_N$}$ = 86 K with 0.75 $$mu_B$$/U, we observed resonant magnetic reflections using synchrotron X-ray tuned the incident photon energy near M$$_4$$-edge of U and K-edge of Ga, and the large enhancement about 10$$^2$$ 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$textit{p}$ orbital polarization induced by the 5$textit{f}$ orbital polarization at the neighboring U atom due to the hybridization.

Journal Articles

Large orbital magnetic moment and its quenching in the itinerant uranium intermetallic compounds U${it T}$Ga$$_5$$ (${it T}$=Ni, Pd, Pt)

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$$f$$ compounds UTGa$$_5$$ (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$'e$el-type structure for UNiGa$$_5$$, whereas UPtGa$$_5$$ has the antiferromagnetic stacking of the ferromagnetically ordered uranium moments in the $$c$$-plane. The orbital contributions in the magnetic form factor are reduced from the free ion value, especially for UNiGa$$_5$$. 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$$f$$ antiferromagnets.

28 (Records 1-20 displayed on this page)