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Baldrati, L.*; Gomonay, O.*; Ross, A.*; Filianina, M.*; Lebrun, R.*; Ramos, R.*; Leveille, C.*; Fuhrmann, F.*; Forrest, T. R.*; Maccherozzi, F.*; et al.
Physical Review Letters, 123(17), p.177201_1 - 177201_6, 2019/10
被引用回数:130 パーセンタイル:97.93(Physics, Multidisciplinary)We probe the current-induced magnetic switching of insulating antiferromagnet-heavy-metal systems, by electrical spin Hall magnetoresistance measurements and direct imaging, identifying a reversal occurring by domain wall (DW) motion. We observe switching of more than one-third of the antiferromagnetic domains by the application of current pulses. Our data reveal two different magnetic switching mechanisms leading together to an efficient switching, namely, the spin-current induced effective magnetic anisotropy variation and the action of the spin torque on the DWs.
Maurer, C.*; Bar, J.*; Kusmierczyk-Michulec, J.*; Crawford, A.*; Eslinger, P. W.*; Seibert, P.*; Orr, B.*; Philipp, A.*; Ross, O.*; Generoso, S.*; et al.
Journal of Environmental Radioactivity, 192, p.667 - 686, 2018/12
被引用回数:28 パーセンタイル:64.69(Environmental Sciences)地下核実験検知のためには、医療用放射性同位元素製造施設から放出される放射性キセノンのCTBT観測所への影響を把握することが大変重要である。医療用放射性同位元素製造施設から放出される放射性キセノンのCTBT放射性核種観測所への影響に関する調査の一環として、オーストラリアの医療用放射性同位元素製造施設からの放射性キセノンの放出データに基づき、本施設から放出された放射性キセノンが南半球の6つのCTBT放射性核種観測所に与える影響のATM(大気輸送モデル)を用いた予測が10カ国からの参加者により行われた。
Eslinger, P. W.*; Bowyer, T. W.*; Achim, P.*; Chai, T.*; Deconninck, B*; Freeman, K.*; Generoso, S.*; Hayes, P.*; Heidmann, V.*; Hoffman, I.*; et al.
Journal of Environmental Radioactivity, 157, p.41 - 51, 2016/06
被引用回数:37 パーセンタイル:71.75(Environmental Sciences)地下核実験検知のためには、原子力施設や医療用放射性同位体製造施設から放出される放射性キセノンのCTBT観測所への影響を把握することが大変重要である。医療用放射性同位体製造施設から放出される放射性キセノンのCTBT放射性核種観測所への影響に関する調査の一環として、ベルギーの医療用放射性同位体製造施設からの放射性キセノンの放出量に関するデータに基づき、本施設から放出された放射性キセノンがドイツのCTBT放射性核種観測所に与える影響のATM(大気輸送モデル)を用いた予測が7カ国からの参加者により行われた。
Ross, T. J.*; Hughes, R. O.*; Allmond, J. M.*; Beausang, C. W.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Hurke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.
Physical Review C, 90(4), p.044323_1 - 044323_12, 2014/10
被引用回数:7 パーセンタイル:45.30(Physics, Nuclear)Low-spin single quasi neutron levels in Gd and
Gd have been studied following the
Gd (
)
Gd and
Gd (
)
Gd reactions. A combined Si telescope and high-purity germanium array was utilized, allowing
-
and
-
-
coincidence measurements. Almost all of the established low-excitation-energy, low-spin structures were confirmed in both
Gd and
Gd. Several new levels and numerous new
rays are observed in both nuclei, particularly for
1 MeV. Residual effects of a neutron sub shell closure at
= 64 are observed in the form of a large excitation energy gap in the single quasi neutron level schemes.
Ross, T. J.*; Hughes, R. O.*; Beausang, C. W.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Burke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.
Physical Review C, 88(3), p.031301_1 - 031301_4, 2013/09
被引用回数:7 パーセンタイル:46.30(Physics, Nuclear)Odd-mass gadolinium isotopes around = 90 were populated by the (
) reaction, utilizing 25-MeV protons, resulting in population of low-spin quasi-neutron states at energies near and below the Fermi surface. Systematics of the single quasi-neutron levels populated are presented. A large excitation energy gap is observed between levels originating from the
,
and
spherical parents (above the
= 64 gap), and the
(below the gap) indicating that the spherical shell model level spacing is maintained at least to moderate deformations.
Czeszumska, A.*; Angell, C.; Burke, J. T.*; Scielzo, N. D.*; Norman, E. B.*; Austin, R. A. E.*; Boutoux, G.*; Casperson, R. J.*; Chodash, P.*; Hughes, R. O.*; et al.
Physical Review C, 87(3), p.034613_1 - 034613_6, 2013/03
被引用回数:14 パーセンタイル:64.84(Physics, Nuclear)Neutron-induced fission cross section data are needed in various fields of applied and basic nuclear science. However, cross sections of short-lived nuclei are difficult to measure directly due to experimental constraints. The first experimental determination of the neutron-induced fission cross section of Np at non-thermal energies was performed. The Surrogate Ratio Method (SRM) was employed to indirectly deduce the
Np(
,
) cross section. The surrogate reactions used were
U
and
U
with the reference cross section given by the well-known
Np(
,
) cross section. The ratio of observed fission reactions resulting from the two formed compound nuclei,
Np and
Np, was multiplied by the directly-measured
Np(
,
) cross section to determine the
Np(
,
) cross section. The
Np(
,
) cross section was determined with an uncertainty ranging between 3 - 30% over the energy range of 0.2 - 20 MeV.
Ross, T. J.*; Beausang, C. W.*; Hughes, R. O.*; Scielzo, N. D.*; Burke, J. T.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Casperson, R. J.*; et al.
Physical Review C, 86(6), p.067301_1 - 067301_5, 2012/12
被引用回数:3 パーセンタイル:22.19(Physics, Nuclear)Low-spin, high-excitation energy states in Y have been studied using the
Y(
) reaction. For this experiment a 25 MeV proton beam was incident upon a mono-isotopic
Y target. A silicon telescope array was used to detect deuterons and coincident
rays were detected using a germanium clover array. Most of the known low-excitation energy low-spin states populated strongly via the (
) reaction mechanism are confirmed. Two states are seen for the first time and seven new transitions, including one which by-passes the two low-lying isomeric states, are observed.
Ross, T. J.*; Beausang, C. W.*; Hughes, R. O.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Burke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.
Physical Review C, 85(5), p.051304_1 - 051304_5, 2012/05
被引用回数:11 パーセンタイル:52.07(Physics, Nuclear)代理反応法は、20%の精度でアクチニド核の中性子捕獲断面積を評価することができるが、希土類核に対しては、直接測定した中性子捕獲断面積と23倍の不一致がある。これは、スピン/パリティの生成分布の違いによるものであると考えられる。このことを確かめるために、代理反応におけるガドリニウム核の角運動量移行の測定を行った。