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Belle Collaboration,
I. Adachi,
H. Aihara,
D. M. Asner,
V. Aulchenko,
T. Aushev,
T. Aziz,
A. M. Bakich,
A. Bay,
V. Bhardwaj, [......],
E. Won,
B. D. Yabsley,
H. Yamamoto,
Y. Yamashita,
M. Yamauchi,
Y. Yusa,
Z. P. Zhang,
V. Zhilich,
A. Zupanc,
O. Zyukova
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ABSTRACT: We present a precise measurement of the CP violation parameter sin2phi_1 and
the direct CP violation parameter A_f using the final data sample of 772x10^6
B\bar B pairs collected at the Upsilon(4S) resonance with the Belle detector at
the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed
in a J/psi K0S, psi(2S) K0S, chi_c1 K0S or J/psi K0L CP-eigenstate and its
flavor is identified from the decay products of the accompanying B meson. From
the distribution of proper time intervals between the two B decays, we obtain
the following CP violation parameters:
sin2phi_1=0.667+-0.023(stat)+-0.012(syst) and
A_f=0.006+-0.016(stat)+-0.012(syst).
01/2012;
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V P Ladygin,
T Uesaka,
V V Glagolev,
Yu V Gurchin,
A Yu Isupov,
K Itoh,
M Janek,
J-T Karachuk,
T Kawabata,
A N Khrenov, [......],
S Sakaguchi, H Sakai,
K Sekiguchi,
M A Shikhalev,
K Suda,
A A Terekhin,
J Urban,
T A Vasiliev,
I E Vnukov,
H Witala
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ABSTRACT: Recent results on the deuteron analyzing powers obtained in collisions of polarized deuterons with protons and light nuclei at intermediate and high energies are reported. The obtained results are sensitive to the spin structure of the short range correlations. The prospects of the spin program for hadronic reactions at Nuclotron-NICA facility is discussed. The polarimetry developments are also presented.
Journal of Physics Conference Series 05/2011; 295(1):012131.
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ABSTRACT: Mother birds can enhance growth and/or survival of chicks by supplying energetic and hormonal resources to the egg yolk (i.e. maternal effect). In several bird species, mothers supply higher level of testosterone to the eggs laid later within the clutch and enhance the growth of the chick to compensate for the disadvantage of the later hatching. As same as this within-clutch mechanism, mothers breeding later in the season can be expected to supply higher level of testosterone to the clutch. However, among-clutch seasonal variation in yolk testosterone levels has been rarely described. Here, we investigated among-clutch seasonal variation in the yolk testosterone level in Black-tailed Gulls Larus crassirostris, as well as within-clutch variation. Mean yolk testosterone level of eggs laid later within the clutch ("b-eggs") was significantly higher than that of eggs laid earlier ("a-eggs"). The yolk testosterone levels of both a- and b-eggs of later breeders were significantly higher than those of earlier ones, while this trend was not observed in mean egg mass. Our results indicate that mothers establishing the clutch later in the season would invest more maternal testosterone into the clutch.
ORNITHOLOGICAL SCIENCE 01/2011; 10(1):21-25.
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ABSTRACT: We will report the results of our recent inelastic neutron scattering study on β-US2. This compound shows a semi-metallic or narrow gap semi-conducting behaviour at room temperature. A clear exponential up-turn of the resistivity in the order of ~106 Ωcm has been observed below 100 K. We found a sharp inelastic peak at the excitation energy of about 7 meV at 8 K. The Q-dependence of the peak intensity is in good agreement with the magnetic form factor of U4+ ion and no clear dispersion relation has been observed. Therefore we concluded that this is a crystalline electric field (CEF) excitation peak. The excitation energy is in good agreement with the CEF level scheme obtained from the susceptibility data. The CEF peak intensity decreases with increasing temperature and becomes much weaker than the calculated temperature factor expected from the CEF level scheme. Furthermore a quasi-elastic response appears, and coexists with a broadened CEF peak at higher temperatures. The quasi-elastic component is not due to phonon, because the temperature dependence of the intensity is inconsistent with calculation. We concluded that this quasi-elastic response is a hybridization effect of U-5f electrons with, most likely, p-electrons of sulfur. It is highly interesting that the energy scale of the CEF peak (~7 meV) is very close to the conduction gap (90K), and the quasi-elastic component appears above the characteristic temperature of about 100 K. Our data strongly suggest that the crossover of 5f character plays an import role for the metal-insulating transition in β-US2.
IOP Conference Series Materials Science and Engineering 05/2010; 9(1):012088.
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ABSTRACT: UNiSi2 orders ferromagnetically below TCurie = 95 K. This material crystallizes in the orthorhombic CeNiSi2-type structure. The uranium atoms form double-layers, which are stacked along the crystallographic b axis (the longest axis). From magnetization measurements the easy (hard) magnetization axis is the c axis (b axis). 29Si-NMR measurements have been performed in the paramagnetic state. In UNiSi2, two crystallographic Si sites exist with orthorhombic local symmetry. The Knight shifts on each Si sites have been estimated from these spectra of random and oriented powders. The transferred hyperfine couplings have been also derived. It is found that the transferred hyperfine coupling constants on each Si sites are nearly isotropic, and that their Knight shift anisotropy comes from that of the bulk susceptibility. The nuclear-spin lattice relaxation rate 1/T1 shows temperature-independent behaviour, which indicates the existence of localized 5f electrons.
IOP Conference Series Materials Science and Engineering 05/2010; 9(1):012097.
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ABSTRACT: In order to clarify quantum criticality in heavy fermion systems, we propose to use the Gaussian spin-echo decay rate 1/T2G of the NMR spin-spin relaxation. In contrast to the spin-lattice relaxation rate 1/T1, which is connected with the dynamical susceptibility Imχ(q,ω), I/T2G is driven by the static susceptibility Reχ(q,0) at finite q for an antiferromagnet. The combined quantity T1T/T22G is found to provide key information in determining the nature of quantum criticality. The T-dependence of T1T/T22G for the Sn site in the heavy fermion compound USn3 is presented as an example.
Journal of Physics Conference Series 02/2010; 200(1):012076.
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ABSTRACT: We report the first 139 La-NMR measurements on a La dilute system of PrPb3. We have succeeded to detect 139La-NMR signal on a powder sample of Pr0.97La0.03Pb3 and extracted the temperature dependence of the Knight shift139 K(T) in a temperature range between 1.5 and 220 K. K(T) has been found to maintain a linear relation with the bulk-susceptibility χ(T)bulk in wide temperature range, except for a small deviation in the temperature region below 6 K. The slopes of the139 K vs ν bulk plots yield for the hyperfine coupling constants Ahf the value 375 Oe/μB. From the NMR results, we discuss the effect of the La substitutions on microscopic magnetic properties of PrPb3.
Journal of Physics Conference Series 03/2009; 150(4):042211.
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S. Umehara,
T. Kishimoto,
I. Ogawa,
R. Hazama,
H. Miyawaki,
S. Yoshida,
K. Matsuoka,
K. Kishimoto,
A. Katsuki, H. Sakai,
D. Yokoyama,
K. Mukaida,
S. Tomii,
Y. Tatewaki,
T. Kobayashi,
A. Yanagisawa
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ABSTRACT: We searched for the neutrino-less double-β decay(0νββ) of 48Ca by using CaF2(Eu) scintillators. Analysis of their pulse shapes was effective to reduce backgrounds. No events are observed in the Qββ value region for the data of 3394 kg · day. It gives a lower limit (90% confidence level) of T1/20νββ>2.7×1022 year for the half-life of 0νββ of 48Ca. Combined with our previous data for 1553 kg · day [I. Ogawa et al., Nucl. Phys. A730, 215 (2004)], we obtained a more stringent limit of T1/20νββ>5.8×1022 year.
Phys. Rev. C. 11/2008; 78(5).
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S Umehara,
T Kishimoto,
I Ogawa,
R Hazama,
H Miyawaki,
S Yoshida,
K Matsuoka,
K Kishimoto,
A Katsuki, H Sakai,
D Yokoyama,
K Mukaida,
S Tomii,
Y Tatewaki,
T Kobayashi,
A Yanagisawa
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ABSTRACT: We report the new limit on the half-life of neutrino-less double beta decay(0νββ) of 48Ca. In order to achieve the background free measurement, measurement of pulse shape was essential. We have observed no event in the Qββ-value region. We set the new limit on 0νββ half-life as T0νββ1/2 > 40 × 1022 year.
Journal of Physics Conference Series 07/2008; 120(5):052058.
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I. Sugiura,
N. Misawa,
S. Otsuka,
N. Nishikawa,
Y. Iba,
F. Sugimoto,
Y. Setta, H. Sakai,
Y. Koura,
K. Nakano,
T. Suzuki,
H. Kitada,
N. Shimizu,
S. Nakai,
M. Nakaishi,
S. Fukuyama,
T. Nakamura,
E. Yano,
M. Miyajima,
K. Watanabe
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ABSTRACT: We developed a 65-nm CMOS technology that could successfully integrate a novel porous low-k material, NCS. Using our nano-clustering technique, we obtained that NCS had a high compatibility between a very low dielectric constant and high framework strength. We successfully fabricated 11-levels Cu interconnects using hybrid-NCS structure. These interconnects had a high tolerance to the etching process and produced a smooth surface on the bottom of the trenches, with no via-fences, and no low-k voiding. They did not require a pore-sealing process. These high-performance hybrid-NCS/Cu multilevel interconnects met the 65-nm node requirements for Back-End of the Line, while maintaining sufficient robustness to support CMP, wire-bonding, and packaging processes. Hybrid-NCS/Cu multilevel interconnects are suitable for mass production and show excellent reliability for 65-nm node device requirements.
Microelectronic Engineering 12/2005; 82(3-4):380. · 1.56 Impact Factor
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M Sasano, H Sakai,
K Yako,
T Saito,
H Kuboki,
Y Takahasi,
T Wakasa,
S Asaji,
Y Hagihara,
K Hatanaka, [......],
Y Sakemi,
Y Tameshige,
Y Shimizu,
K Fujita,
Y Fujita,
H Okamura,
K Sekiguchi,
Y Maeda,
T Kawabata,
M B Greenfield
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ABSTRACT: The Gamow–Teller (GT) unit cross section, GT, is an essential quantity to deduce the GT transition strength, B(GT), from the (p, n) 0° cross section. (p, n) measurements at 200 and 300 MeV were performed using the Neutron Time-of-Flight (NTOF) facility at the Research Center for Nuclear Physics (RCNP). The GT values were determined, for the first time, for several nuclei in the region of A > 50 at Ep = 200 and 300 MeV. A significant difference between the B(GT) values obtained by (p, n) and (3He, t) measurements was found.
Journal of Physics Conference Series 09/2005; 20(1):181.
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T. Kishimoto,
I. Ogawa,
R. Hazama,
S. Yoshida,
S. Umehara,
K. Matsuoka, H. Sakai,
D. Yokoyama,
K. Mukaida,
K. Ichihara,
Y. Tatewaki,
K. Kishimoto,
Y. Hirano,
A. Yanagisawa,
S. Ajimura
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ABSTRACT: CANDLES is the project to search for double beta decay of 48Ca by using CaF2 crystals. Double beta decay of 48Ca has the highest Q value among all nuclei whose double beta decay is energetically allowed. This feature makes the study almost background free and becomes important once the study is limited by the backgrounds. We studied double beta decays of 48Ca by using ELEGANTS VI detector system which features CaF2(Eu) crystals. We gave the best limit on the lifetime of neutrino‐less double beta decay of 48Ca although further development is vital to reach the neutrino mass of current interest for which CANDLES is designed. In this article we present how CANDLES can achieve low radioactivity, which is the key for the future double beta decay experiment. © 2005 American Institute of Physics
AIP Conference Proceedings. 09/2005; 785(1):104-109.
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ABSTRACT: The antiferromagnetic (AF) state of UGa3 is studied using 69Ga nuclear magnetic resonance. We have observed a drastic change of the hyperfine coupling constant at the Ga site around the AF transition (TN = 67 K) in UGa3. The internal field at the Ga site appears at slightly lower temperature ~63 K, indicating another anomaly around 63 K. A possible origin of the anomaly is discussed, in terms of orbital ordering.
Journal of Physics Condensed Matter 07/2003; 15(28):S1979. · 2.55 Impact Factor
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ABSTRACT: Photocurrent spectra of thin-film ZnS on glass fabricated by pulsed-laser deposition have been studied employing electric fields up to 20 kV/cm. The spectra show a shift towards lower energy at and beyond 10 kV/cm. By modeling the film absorption with the density of states and the Urbach rule, it is shown that, without the involvement of the Franz–Keldysh effect and excitonic transitions, the slope of the Urbach tail depends on the electric field, owing to impurity ionization. © 2003 American Institute of Physics.
Applied Physics Letters 03/2003; 82(13):2026-2028. · 3.84 Impact Factor
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ABSTRACT: Employing nanosecond and femtosecond laser pulses at 355 nm (3.49 eV) and 768 nm (1.61 eV), green single- and two-photon-excited interband emission at 2.412 and 2.381 eV of thin-film cadmium sulfide (CdS) on glass has been measured at room temperature. The spectra are fitted and analyzed by a theory based on the detailed balance principle. The results demonstrate that the interband emission is independent of the mode of excitation and that the energy shift of the spectra is solely due to self-absorption of the emission evoked by two-photon excitation. The work also addresses energy dissipation in thin-film CdS excited beyond the Mott transition. © 2003 American Institute of Physics.
Journal of Applied Physics 02/2003; 93(4):1914-1917. · 2.17 Impact Factor
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ABSTRACT: The photoluminescence of oriented thin-film CdS on glass formed by laser deposition was investigated employing 200 fs, 1.54 eV laser pulses at room temperature. The ultrafast excitation caused a two-photon absorption process, which results in purely green emission at the band gap. The spectra are fitted very well by the application of the van Roosbroeck–Shockley relation, density of states, and Urbach’s rule demonstrating the intrinsic character of the radiative recombination. It is further shown that the energy position of the emission peak depends on the polarization of the impinging laser beam due to the dichroism of the highly oriented films. © 2002 American Institute of Physics.
Applied Physics Letters 01/2002; 80(3):356-358. · 3.84 Impact Factor
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ABSTRACT: The emission of thin-film CdS on glass is investigated by ultra-fast pulsed excitation at room temperature. It is demonstrated that, in contrast to single-photon excitation, two-photon excitation causes intrinsic gap emission in extrinsic samples without transitions below the gap. The spectra are perfectly fitted by the van Roosbroeck-Shockley relation, which describes the detailed balance between absorption and emission. The spectrum measured through the glass is shifted 40 meV to lower energies with respect to the front emission due to increased absorption at the glass/CdS interface.
Semiconductor Science and Technology 10/2001; 16(12):L89. · 1.72 Impact Factor
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ABSTRACT: Starting from the q-discrete form of the Painlevé VI equation we obtain its degenerate forms by applying the procedure of coalescence of singularities. The whole cascade of degenerate forms is thus obtained leading to new forms for the discrete Painlevé IV and V equations. The Lax pairs of these discrete Painlevé equations are explicitly constructed, thus confirming their integrability.
Journal of Physics A General Physics 12/1998; 31(15):3545.
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T Motobayashi,
S Satoh, H Sakai,
N Matsuoka,
T Saito,
T Noro,
K Hosono,
A Okihana,
M Ishihara,
H Okamura,
S Hatori
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ABSTRACT: The tensor analysing power Ayy was measured for the 12C(d, 2He)12B reaction at Ed=70 MeV. A DWBA calculation well reproduces the experimental data for Delta l=0 transition to the 1+ ground state of 12B. For the transition to the 2- excited state via Delta l=1, the predicted curve assuming 2- is closer to the data than that assuming either 0- or 1-. The same calculation also favours 2- in analysing the previous data on the vector analysing power. These results suggest the usefulness of the simultaneous measurements of vector and tensor analysing powers. The dependence of Ayy on the final-state spin predicted by the present DWBA calculation is similar to that predicted by the PWIA theory.
Journal of Physics G Nuclear Physics 12/1998; 14(6):L137.
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ABSTRACT: The spin-transfer coefficient Kyy'(0 degrees ) has been measured for the reaction 12C(p,n)12N at Ep=65 MeV using the neutron double scattering technique. Microscopic DWBA calculations with the M3Y effective interaction give a qualitative account of the Kyy'( degrees ) data for the 1+ transition. Better agreement is obtained if the high-q component of the tensor force is reduced.
Journal of Physics G Nuclear Physics 12/1998; 10(6):L139.
