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Two-hole structure outsideNi78: Existence of aμsisomer ofCo76andβdecay intoNi76
Sö,derströ,m, P.-A.,Nishimura, S.,Xu, Z. Y.,Sieja, K.,Werner, V.,Doornenbal, P.,Lorusso, G.,Browne, F.,Gey, G.,Jung, H. S.,Sumikama, T.,Taprogge, J.,Vajta, Zs.,Watanabe, H.,Wu, J.,Baba, H.,Dom American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.5
Sö,derströ,m, P.-A.,Walker, P.M.,Wu, J.,Liu, H.L.,Regan, P.H.,Watanabe, H.,Doornenbal, P.,Korkulu, Z.,Lee, P.,Liu, J.J.,Lorusso, G.,Nishimura, S.,Phong, V.H.,Sumikama, T.,Xu, F.R.,Yagi, A.,Zha North-Holland Pub. Co 2016 Physics letters. Section B Vol.762 No.-
<P><B>Abstract</B></P> <P>A detailed study of the structure of the doubly mid-shell nucleus Dy 104 1 66 170 has been carried out, following isomeric and <I>β</I> decay. We have measured the yrast band up to the spin-parity <SUP> J π </SUP> = <SUP> 6 + </SUP> state, the K = 2 <I>γ</I>-vibration band up to the <SUP> 5 + </SUP> state, a low-lying negative-parity band based on a <SUP> 2 − </SUP> state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the <SUP> K π </SUP> = <SUP> 6 + </SUP> two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by <SUB> N p </SUB> <SUB> N n </SUB> systematics. This is interpreted as being due to <I>γ</I>-vibrational mixing from a near degeneracy of the isomer and the <SUP> 6 + </SUP> state of the <I>γ</I> band. Furthermore, the parent nucleus <SUP>170</SUP>Tb has been determined to have a half-life of 0.91 ( − 13 + 18 ) s with a possible spin-parity of <SUP> 2 − </SUP> .</P>
Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene
Crossno, Jesse,Shi, Jing K.,Wang, Ke,Liu, Xiaomeng,Harzheim, Achim,Lucas, Andrew,Sachdev, Subir,Kim, Philip,Taniguchi, Takashi,Watanabe, Kenji,Ohki, Thomas A.,Fong, Kin Chung American Association for the Advancement of Scienc 2016 Science Vol.351 No.6277
<P><B>Electrons that flow like a fluid</B></P><P>Electrons inside a conductor are often described as flowing in response to an electric field. This flow rarely resembles anything like the familiar flow of water through a pipe, but three groups describe counterexamples (see the Perspective by Zaanen). Moll <I>et al.</I> found that the viscosity of the electron fluid in thin wires of PdCoO<SUB>2</SUB> had a major effect on the flow, much like what happens in regular fluids. Bandurin <I>et al.</I> found evidence in graphene of electron whirlpools similar to those formed by viscous fluid flowing through a small opening. Finally, Crossno <I>et al.</I> observed a huge increase of thermal transport in graphene, a signature of so-called Dirac fluids.</P><P><I>Science</I>, this issue p. 1061, 1055, 1058; see also p. 1026</P><P>Interactions between particles in quantum many-body systems can lead to collective behavior described by hydrodynamics. One such system is the electron-hole plasma in graphene near the charge-neutrality point, which can form a strongly coupled Dirac fluid. This charge-neutral plasma of quasi-relativistic fermions is expected to exhibit a substantial enhancement of the thermal conductivity, thanks to decoupling of charge and heat currents within hydrodynamics. Employing high-sensitivity Johnson noise thermometry, we report an order of magnitude increase in the thermal conductivity and the breakdown of the Wiedemann-Franz law in the thermally populated charge-neutral plasma in graphene. This result is a signature of the Dirac fluid and constitutes direct evidence of collective motion in a quantum electronic fluid.</P>
Yuk, Jong Min,Kim, Kwanpyo,Lee, Zonghoon,Watanabe, Masashi,Zettl, A.,Kim, Tae Whan,No, Young Soo,Choi, Won Kook,Lee, Jeong Yong American Chemical Society 2010 ACS NANO Vol.4 No.6
<P>Zero- and one-dimensional metal nanocrystals were successfully fabricated with accurate control in size, shape, and position on semiconductor surfaces by using a novel <I>in situ</I> fabrication method of the nanocrystal with a biasing tungsten tip in transmission electron microscopy. The dominant mechanism of nanocrystal formation was identified mainly as local Joule heating-assisted electromigration through the direct observation of formation and growth processes of the nanocrystal. This method was applied to extracting metal atoms with an exceedingly faster growth rate (∼10<SUP>5</SUP> atoms/s) from a metal-oxide thin film to form a metal nanocrystal with any desired size and position. By real-time observation of the microstructure and concurrent electrical measurements, it was found that the nanostructure formation can be completely controlled into various shapes such as zero-dimensional nanodots and one-dimensional nanowires/nanorods.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-6/nn901674p/production/images/medium/nn-2009-01674p_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn901674p'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn901674p'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn901674p'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn901674p'>ACS Electronic Supporting Info</A></P>
Watanabe, H.,Zhang, G.X.,Yoshida, K.,Walker, P.M.,Liu, J.J.,Wu, J.,Regan, P.H.,Soderstrom, P.A.,Kanaoka, H.,Korkulu, Z.,Lee, P.S.,Nishimura, S.,Yagi, A.,Ahn, D.S.,Alharbi, T.,Baba, H.,Browne, F.,Bruce North-Holland Pub. Co 2016 Physics letters. Section B Vol.760 No.-
The level structure of <SUP>172</SUP>Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a <SUP>238</SUP>U beam. A long-lived isomeric state with T<SUB>½</SUB>=0.71(5) s and K<SUP>π</SUP>=8<SUP>-</SUP> has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus <SUP>172</SUP>Ho via allowed β decays. The robust nature of the K<SUP>π</SUP>=8<SUP>-</SUP> isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.
Watanabe, H.,Wang, H.K.,Lorusso, G.,Nishimura, S.,Xu, Z.Y.,Sumikama, T.,Sö,derströ,m, P.-A.,Doornenbal, P.,Browne, F.,Gey, G.,Jung, H.S.,Taprogge, J.,Vajta, Zs.,Wu, J.,Yagi, A.,Baba, H.,Benzon Elsevier 2019 Physics letters: B Vol.792 No.-
<P><B>Abstract</B></P> <P>The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N = 82 neutron shell closure and its influence on the <I>r</I>-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in <SUP>125</SUP>Pd<SUB>79</SUB> and <SUP>127</SUP>Pd<SUB>81</SUB> studied using the EURICA <I>γ</I>-ray spectrometer, following production via in-flight fission of a high-intensity <SUP>238</SUP>U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of ( 23 / <SUP> 2 + </SUP> ) and ( 19 / <SUP> 2 + </SUP> ) in <SUP>125</SUP>Pd and <SUP>127</SUP>Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus <SUP>132</SUP>Sn.</P>
Evaluating Fuzzy Voice Commands by Internal Rehearsal for Controlling a Robot Manipulator
A.G. Buddhika P. Jayasekara,Keigo Watanabe,Kiyotaka Izumi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a method fore valuating fuzzy voice commands(FVCs) by internal rehearsal. The robot’s experience on previous movements is very useful forunder standing fuzzy linguistic information. Therefore, an internal rehearsal system is introduced to acquire the robot’s experience on previous movements. Such acquisition enhances the robot’s capability to interpret fuzzy linguistic information in FVCs according to the current environmental context The proposed system is used to evaluate the fuzzy linguistic information related to the primitive movements of a robot manipulator. Those primitive movements are realized by behavior evaluation network(BEN) with the guidance of the internal rehearsal system. Mainly, the system is utilized to understand fuzzy voice motion commands(FVMCs) and fuzzy voice joint commands(FVJCs) for controlling the end-effect or movements and the single joint movements of the robot manipulator. The proposed idea is demonstrated with a PA-10 robot manipulator.
Evaluating Fuzzy Voice Commands by User Guided Visual Attention for Controlling a Robot Manipulator
A.G. Buddhika P. Jayasekara,Keigo Watanabe,Kiyotaka Izumi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper proposes a method for evaluating fuzzy voice commands(FVCs) by user guided visual attention. FVCs inherit fuzzy linguistic information due to the inclusion of fuzzy linguistic terms such as “verylittle.” The contextual meaning of such information depends on the environmental arrangement. Therefore, visual attention system(VAS) is utilized to evaluate the fuzzy linguistic information based on the environmental conditions. It is implemented by assuming that the corresponding distance value for aparticular FVC depends on the spatialar rangement of the surrounding object in the environment. A fuzzy logic based voice command evaluation system(VCES) is proposed to assess the fuzzy linguistic information in user commands. In addition, the user has been given the freedom to adjust command evaluation process by changing the attention level. It is achieved by using attentive voice commands such as “move carefully.” A situation of object manipulation by navigating the tip of a robot manipulator through the user’s working space is demonstrated to illustrate the sysem where a PA-10 robot manipulator is used.
Watanabe, H.,Lorusso, G.,Nishimura, S.,Otsuka, T.,Ogawa, K.,Xu, Z. Y.,Sumikama, T.,Sö,derströ,m, P.-A.,Doornenbal, P.,Li, Z.,Browne, F.,Gey, G.,Jung, H. S.,Taprogge, J.,Vajta, Zs.,Wu, J.,Yagi, American Physical Society 2014 Physical Review Letters Vol.113 No.4
<P>A new isomer with a half-life of 23.0(8) ms has been identified at 2406 keV in (126)Pd and is proposed to have a spin and parity of 10(+) with a maximally aligned configuration comprising two neutron holes in the 1h(11/2) orbit. In addition to an internal-decay branch through a hindered electric octupole transition, β decay from the long-lived isomer was observed to populate excited states at high spins in (126)Ag. The smaller energy difference between the 10(+) and 7(-) isomers in (126)Pd than in the heavier N=80 isotones can be interpreted as being ascribed to the monopole shift of the 1h(11/2) neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below (132)Sn are discussed in terms of the central and tensor forces.</P>
Phase Diagram and Transport Properties of Y1−xNdxCo2 Pseudo-binary Alloys
A. T. Burkov,M. Takeda,A. Teruya,S. Watanabe,Y. Hiranaka,A. Nakamura,M. Hedo,T. Nakama,K. Yagasaki,Y. Takaesu,K. Uchima,Y. Uwatoko 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The electrical resistivity and the thermopower S of pseudo-binary Y1−xNdxCo2 alloys have beenmeasured at temperatures from 2 to 300 K under pressures up to 3.5 GPa. NdCo2 is a ferromagnetwith a Curie temperature TC of 98 K. In the ferromagnetic phase, it undergoes a 4f spin-reorientationtransition at TR = 40 K. At this transition, the easy direction of 4f magnetization is changed from[100] at temperatures above TR to [110] below TR. The system phase diagram TC(x, P) and TR(x, P)is inferred from the temperature dependencies of the electrical resistivity and the thermopower. The Curie temperature of the alloys, TC decreases with decreasing Nd concentration x and vanishesaround xc = 0.3. Above xc, the Curie temperature decreases with increasing pressure. The spinreorientationtemperature weakly depends on the composition and on the pressure until it mergeswith TC. There is a large region of the phase diagram, partly overlapping with the ferromagneticphase, where the cobalt 3d electron system is non-uniformly magnetized due to spatial fluctuationsof the 4f-3d exchange field related to a random distribution of Nd 4f magnetic moments over the Rsublattice. In this region, large static 3d magnetic fluctuations govern the electronic transport.