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Journal Articles

Enhanced Spin-Orbit Coupling in a Correlated Metal

Kubo, Katsunori

Journal of the Physical Society of Japan, 91(12), p.124707_1 - 124707_7, 2022/12

 Times Cited Count:0

Journal Articles

Challenging studies by accelerator mass spectrometry for the development of environmental radiology; Status report on the analysis of $$^{90}$$Sr and $$^{135}$$Cs by AMS

Honda, Maki; Martschini, M.*; Wieser, A.*; Marchhart, O.*; Lachner, J.*; Priller, A.*; Steier, P.*; Golser, R.*; Sakaguchi, Aya*

JAEA-Conf 2022-001, p.85 - 90, 2022/11

Accelerator mass spectrometry (AMS) is an analytical method that combines mass spectrometry with a tandem accelerator, which has been used mainly in nuclear physics experiments. AMS is used to measure radionuclides with half-lives of 10$$^{3}$$-10$$^{8}$$ years. For radionuclides with half-lives of this order, the method of measuring their mass is 10$$^{3}$$-10$$^{6}$$ times more sensitive than measuring their activity. Because of this advantage, AMS has been widely applied in Earth and planetary sciences, atomic energy research, and other fields. Among the various studies, Wallner et al. (2021, 2016) have achieved excellent work in Earth and planetary sciences. For example, they have attained the ultra-sensitive analysis of $$^{60}$$Fe and $$^{244}$$Pu in environmental samples. These are radionuclides produced by rapid-neutron-capture (r-process) nucleosynthesis. Our recent work shows that a new AMS system (VERA, University of Vienna), which combines laser isobaric separation and a typical AMS system, has been successfully applied to the ultra-sensitive determination of $$^{90}$$Sr and $$^{135}$$Cs in environment. For $$^{90}$$Sr in environmental samples, the $$beta$$-ray measurement by the milking of the daughter nuclide $$^{90}$$Y is still the principal method, which takes 3-6 weeks. The new AMS method has a detection limit of $$<$$ 0.1 mBq, which is comparable to that of $$beta$$-ray measurement, with a more straightforward chemical treatment than $$beta$$-measurement. Our achievement demonstrates that AMS can be a practical new method for determining $$^{90}$$Sr in the environment.

Journal Articles

Weinberg operator contribution to the $$CP$$-odd nuclear force in the quark model

Yamanaka, Nodoka*; Oka, Makoto

Physical Review D, 106(7), p.075021_1 - 075021_15, 2022/10

 Times Cited Count:0

The contribution of the $$CP$$ violating three-gluon interaction, proposed by Weinberg, to the short-range $$CP$$-odd nuclear force is evaluated in the nonrelativistic quark model. We first show that the naive leading contribution generated by the quark exchange process vanishes at sufficiently short distance within the resonating group method, by considering the one-loop level gluon exchange $$CP$$-odd interquark potential induced by the Weinberg operator with massive quarks and gluons. We then estimate the true leading contribution by evaluating the gluonic correction to the $$CP$$-odd interquark potential in the closure approximation. It is found that the resulting irreducible $$CP$$-odd nuclear force is comparable to that generated by the chiral rotation of the $$CP$$-even short-range nuclear force, where the $$CP$$-odd mass calculated with QCD sum rules is used as input. The explicit calculation of the electric dipole moment (EDM) of the $$^3$$He nucleus yields $$d^{(irr)}_{3He}(w) = -1.5 w e$$ MeV. The total $$^3He$$ EDM, accounting for the intrinsic nucleon EDM, the pion-exchange and the short- range $$CP$$-odd nuclear force, is $$d_{(tot)}(w) = 20(+14-11) we$$ MeV, with the dominant effect coming from the intrinsic nucleon EDM.

Journal Articles

Optical spin conductivity in ultracold quantum gases

Sekino, Yuta*; Tajima, Hiroyuki*; Uchino, Shun

Physical Review Research (Internet), 4(4), p.043014_1 - 043014_16, 2022/10

We show that the optical spin conductivity being a small AC response of a bulk spin current and elusive in condensed matter systems can be measured in ultracold atoms. We demonstrate that this conductivity contains rich information on quantum states by analyzing experimentally achievable systems. The obtained conductivity spectra being absent in the Drude conductivity reflect quasiparticle excitations and non-Fermi liquid properties. Unlike its mass transport counterpart, the spin conductivity serves as a probe applicable to clean atomic gases without disorder and lattice potentials. Our formalism can be generalized to various systems such as spin-orbit coupled and nonequilibrium systems.

Journal Articles

Radioactive particles from a range of past nuclear events; Challenges posed by highly varied structure and composition

Johansen, M. P.*; Child, D. P.*; Collins, R.*; Cook, M.*; Davis, J.*; Hotchkis, M. A. C.*; Howard, D. L.*; Howell, N.*; Ikeda, Atsushi; Young, E.*

Science of the Total Environment, 842, p.156755_1 - 156755_11, 2022/10

 Times Cited Count:1 Percentile:65.93(Environmental Sciences)

Journal Articles

Water conservation behavior; Exploring the role of social, psychological, and behavioral determinants

Singha, B.*; Eljamal, O.*; Karmaker, S. C.*; Maamoun, I.; Sugihara, Yuji*

Journal of Environmental Management, 317, p.115484_1 - 115484_9, 2022/09

 Times Cited Count:0 Percentile:0(Environmental Sciences)

Journal Articles

Nuclear pasta structures at high temperatures

Xia, C.-J.*; Maruyama, Toshiki; Yasutake, Nobutoshi*; Tatsumi, Toshitaka*

Physical Review D, 106(6), p.063020_1 - 063020_14, 2022/09

 Times Cited Count:0 Percentile:0.01(Astronomy & Astrophysics)

Journal Articles

Measurement of differential cross sections for $$Sigma^+ p$$ elastic scattering in the momentum range 0.44-0.80 GeV/c

Nanamura, Takuya; Fujita, Manami; Hasegawa, Shoichi; Ichikawa, Masaya; Ichikawa, Yudai; Imai, Kenichi*; Naruki, Megumi; Sato, Susumu; Sako, Hiroyuki; Tamura, Hirokazu; et al.

Progress of Theoretical and Experimental Physics (Internet), 2022(9), p.093D01_1 - 093D01_35, 2022/09

 Times Cited Count:0 Percentile:0.01(Physics, Multidisciplinary)

Journal Articles

Kaon-baryon coupling schemes and kaon condensation in hyperon-mixed matter

Muto, Takumi*; Maruyama, Toshiki; Tatsumi, Toshitaka*

Progress of Theoretical and Experimental Physics (Internet), 2022(9), p.093D03_1 - 093D03_37, 2022/09

 Times Cited Count:0 Percentile:0.01(Physics, Multidisciplinary)

Journal Articles

Novel graphene-based foam composite as a highly reactive filter medium for the efficient removal of gemfibrozil from (waste)water

Khalil, A. M. E.*; Han, L.*; Maamoun, I.; Tabish, T. A.*; Chen, Y.*; Eljamal, O.*; Zhang, S.*; Butler, D.*; Memon, F. A.*

Advanced Sustainable Systems (Internet), 6(8), p.2200016_1 - 2200016_16, 2022/08

 Times Cited Count:0 Percentile:0(Green & Sustainable Science & Technology)

Journal Articles

On the adsorption and reactivity of element 114, flerovium

Yakushev, A.*; Lens, L.*; D$"u$llmann, Ch. E.*; Khuyagbaatar, J.*; J$"a$ger, E.*; Krier, J.*; Runke, J.*; Albers, H. M.*; Asai, Masato; Block, M.*; et al.

Frontiers in Chemistry (Internet), 10, p.976635_1 - 976635_11, 2022/08

 Times Cited Count:0 Percentile:0(Chemistry, Multidisciplinary)

Flerovium (Fl, element 114) is the heaviest element chemically studied so far. The first chemical experiment on Fl suggested that Fl is a noble-gas-like element, while the second studies suggested that Fl has a volatile-metal-like character. To obtain more reliable conclusion, we performed further experimental studies on Fl adsorption behavior on Si oxide and gold surfaces. The present results suggest that Fl is highly volatile and less reactive than the volatile metal, Hg, but has higher reactivity than the noble gas, Rn.

Journal Articles

The Damage analysis for irradiation tolerant spin-driven thermoelectric device based on single-crystalline Y$$_3$$Fe$$_5$$O$$_{12}$$/Pt heterostructures

Ieda, Junichi; Okayasu, Satoru; Harii, Kazuya*; Kobata, Masaaki; Yoshii, Kenji; Fukuda, Tatsuo; Ishida, Masahiko*; Saito, Eiji

IEEE Transactions on Magnetics, 58(8), p.1301106_1 - 1301106_6, 2022/08

 Times Cited Count:0 Percentile:0(Engineering, Electrical & Electronic)

The combination of spin-driven thermoelectric (STE) devices based on spin Seebeck effect (SSE), and radioactive isotopes as heat sources, has potential as a next-generation method of power generation in applications such as power supplies for space probes. However, there has been very limited knowledge available indicating the irradiation tolerance of spin thermoelectric devices. Through analysis using a heavy ion-beam accelerator and the hard X-ray photoemission spectroscopy (HAXPES) measurements, we show that a prototypical STE device based on Y$$_3$$Fe$$_5$$O$$_{12}$$/Pt heterostructures has tolerance to irradiation of high-energy heavy-ion beams. We used 320 MeV gold ion beams modeling cumulative damages due to fission products emitted from the surface of spent nuclear fuels. By varying the dose level, we confirmed that the thermoelectric and magnetic properties of the SSE elements are not affected by the ion-irradiation dose up to $$10^{10}$$ ions/cm$$^2$$ fluence and that the SSE signal is extinguished around $$10^{12}$$ ions/cm$$^2$$, in which the ion tracks almost fully cover the sample surface. In addition, the HAXPES measurements were performed to understand the effects at the interface of Y$$_3$$Fe$$_5$$O$$_{12}$$/Pt. The HAXPES measurements suggest that the chemical reaction that diminishes the SSE signals is enhanced with the increase of the irradiation dose. We share the current understandings of the damage analysis in Y$$_3$$Fe$$_5$$O$$_{12}$$/Pt for developing better STE devices applicable to harsh environmental usages.

Journal Articles

Promotion of ciprofloxacin adsorption from contaminated solutions by oxalate modified nanoscale zerovalent iron particles

Falyouna, O.*; Idham, M. F.*; Maamoun, I.; Bensaida, K.*; Ashik, U. P. M.*; Sugihara, Yuji*; Eljamal, O.*

Journal of Molecular Liquids, 359, p.119323_1 - 119323_20, 2022/08

 Times Cited Count:3 Percentile:69.43(Chemistry, Physical)

Journal Articles

Magnetic orderings from spin-orbit coupled electrons on kagome lattice

Watanabe, Jin*; Araki, Yasufumi; Kobayashi, Koji*; Ozawa, Akihiro*; Nomura, Kentaro*

Journal of the Physical Society of Japan, 91(8), p.083702_1 - 083702_5, 2022/08

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

We investigate magnetic orderings on kagome lattice numerically from the tight-binding Hamiltonian of electrons, governed by the filling factor and spin-orbit coupling (SOC) of electrons. We find that even a simple kagome lattice model can host both ferromagnetic and noncollinear antiferromagnetic orderings depending on the electron filling, reflecting gap structures in the Dirac and flat bands characteristic to the kagome lattice. Kane-Mele- or Rashba-type SOC tends to stabilize noncollinear orderings, such a magnetic spirals and 120-degree antiferromagnetic orderings, due to the effective Dzyaloshinskii-Moriya interaction from SOC. The obtained phase structure helps qualitative understanding of magnetic orderings in various kagome-layered materials with Weyl or Dirac electrons.

Journal Articles

Finding RHEED conditions sensitive to hydrogen position on Pd(100)

Kawamura, Takaaki*; Fukaya, Yuki; Fukutani, Katsuyuki

Surface Science, 722, p.122098_1 - 122098_8, 2022/08

 Times Cited Count:0 Percentile:0(Chemistry, Physical)

no abstracts in English

Journal Articles

Rapid and efficient chromium (VI) removal from aqueous solutions using nickel hydroxide nanoplates (nNiHs)

Maamoun, I.; Bensaida, K.*; Eljamal, R.*; Falyouna, O.*; Tanaka, Kazuya; Tosco, T.*; Sugihara, Yuji*; Eljamal, O.*

Journal of Molecular Liquids, 358, p.119216_1 - 119216_13, 2022/07

 Times Cited Count:4 Percentile:93.98(Chemistry, Physical)

Journal Articles

Local bifurcation with spin-transfer torque in superparamagnetic tunnel junctions

Funatsu, Takuya*; Kanai, Shun*; Ieda, Junichi; Fukami, Shunsuke*; Ohno, Hideo*

Nature Communications (Internet), 13, p.4079_1 - 4079_8, 2022/07

 Times Cited Count:0 Percentile:0(Multidisciplinary Sciences)

Modulation of the energy landscape by external perturbations governs various thermally-activated phenomena, described by the Arrhenius law. Thermal fluctuation of nanoscale magnetic tunnel junctions with spin-transfer torque (STT) shows promise for unconventional computing, whereas its rigorous representation, based on the Neel-Arrhenius law, has been controversial. In particular, the exponents for thermally-activated switching rate therein, have been inaccessible with conventional thermally-stable nanomagnets with decade-long retention time. Here we approach the Neel-Arrhenius law with STT utilising superparamagnetic tunnel junctions that have high sensitivity to external perturbations and determine the exponents through several independent measurements including homodyne-detected ferromagnetic resonance, nanosecond STT switching, and random telegraph noise. Furthermore, we show that the results are comprehensively described by a concept of local bifurcation observed in various physical systems. The findings demonstrate the capability of superparamagnetic tunnel junction as a useful tester for statistical physics as well as sophisticated engineering of probabilistic computing hardware with a rigorous mathematical foundation.

Journal Articles

$$alpha$$ knockout reaction as a new probe for $$alpha$$ formation in $$alpha$$-decay nuclei

Yoshida, Kazuki; Tanaka, Junki*

Physical Review C, 106(1), p.014621_1 - 014621_6, 2022/07

 Times Cited Count:0 Percentile:0.03(Physics, Nuclear)

Alternative to the $$alpha$$ decay lifetime measurement, we propose the proton-induced $$alpha$$ knockout reaction, ($$p$$,$$palpha$$), as a new probe for the surface $$alpha$$ formation probability of $$alpha$$ decay nuclei. $$^{210,212}$$Po($$p$$,$$palpha$$)$$^{206,208}$$Pb reaction is described by the distorted-wave impulse approximation framework. It is shown that the $$^{212}$$Po/$$^{210}$$Po ratio of the $$alpha$$ knockout cross sections agree with that of the surface $$alpha$$ formation probabilities determined by the lifetime measurements. The result implies that the ($$p$$,$$palpha$$) cross section is a direct probe for the surface $$alpha$$ formation probability, which is an essential quantity to lead us to a complete understanding of the $$alpha$$ decay phenomena.

Journal Articles

Single crystal growth of superconducting UTe$$_2$$ by molten salt flux method

Sakai, Hironori; Opletal, P.; Tokiwa, Yoshifumi; Yamamoto, Etsuji; Tokunaga, Yo; Kambe, Shinsaku; Haga, Yoshinori

Physical Review Materials (Internet), 6(7), p.073401_1 - 073401_10, 2022/07

 Times Cited Count:0 Percentile:0(Materials Science, Multidisciplinary)

The molten salt flux method is applied as a new synthetic route for the single crystals of the spin-triplet superconductor UTe$$_2$$. The single crystals under an optimized growth condition with excess uranium exhibit a superconducting transition at $$T_{rm c}=2.1$$ K, which is the highest $$T_{rm c}$$ reported for this compound. The obtained crystals show a remarkably large residual resistivity ratio with respect to the room temperature value and a small residual electronic contribution in specific heat well below $$T_{rm c}$$. These results indicate that the increase of $$T_{rm c}$$ in UTe$$_2$$ can be achieved by reducing the disorder associated with uranium vacancies. The excess uranium in the molten salt acts as a reducing agent, preventing tetravalent uranium from becoming pentavalent and suppressing creation of uranium vacancies. At the same time, the relatively low growth temperature can suppress Te volatilization.

6547 (Records 1-20 displayed on this page)