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61.
M. Trhlík B. Sedlák S. Kapusta P. Čížek M. Finger J. Koníček É Kisdi-Koszó A. Lovas M. Vobecky J. Kováč 《Hyperfine Interactions》1989,50(1-4):791-797
The nuclear spin-lattice relaxation of192Ir in the glassy alloy Ir3.1Fe80.5B16.4 has been studied by low-temperature nuclear orientation technique. The thermal cycling method has been used. No dependence
on extermal magnetic field in the range 0.25–1.2 T has been observed. Weger’s mechanism seems to play a crucial role. 相似文献
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64.
Lee YJ Wang MZ Abe K Abe K Aihara H Asano Y Aulchenko V Aushev T Bahinipati S Bakich AM Bedny I Bitenc U Bizjak I Bondar A Bozek A Bracko M Brodzicka J Browder TE Chang MC Chang P Chao Y Chen A Chen KF Chen WT Cheon BG Chistov R Choi SK Chuvikov A Cole S Dalseno J Danilov M Dash M Drutskoy A Eidelman S Enari Y Fang F Fratina S Gabyshev N Garmash A Gershon T Gokhroo G Golob B Gorisek A Haba J Hayasaka K Hazumi M Hinz L Hokuue T Hoshi Y Hou S Hou WS Hsiung YB Iijima T Imoto A Inami K Ishikawa A 《Physical review letters》2005,95(6):061802
We report the first observation of the radiative hyperonic B decay B+ --> plambdagamma, using a 140 fb(-1) data sample recorded on upsilom(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. The measured branching fraction is [symbol: see text](B+ --> plambdagamma) = (2.16(+0.58)(-0.53) +/- 0.20) x 10(-6). We examine its M(plambda) distribution and observe a peak near threshold. This feature is expected by the short-distance b --> sgamma transition. A search for B+ --> pepsilon0gamma yields no significant signal, and we set a 90% confidence-level upper limit on the branching fraction of [symbol: see textB+ --> pepsilon0gamma <4.6 x 10(-6). 相似文献
65.
Ushiroda Y Sumisawa K Hazumi M Abe K Abe K Adachi I Aihara H Asano Y Aulchenko V Aushev T Bakich AM Bay A Bedny I Bitenc U Bizjak I Blyth S Bondar A Bozek A Bracko M Brodzicka J Browder TE Chang MC Chang P Chao Y Chen A Chen KF Chen WT Cheon BG Choi SK Choi Y Chuvikov A Cole S Dalseno J Danilov M Dash M Dragic J Eidelman S Fang F Fratina S Gabyshev N Gershon T Gokhroo G Gorisek A Haba J Hara K Hastings NC Hayasaka K Hayashii H Higuchi T Hinz L Hokuue T Hoshi Y Hou S Hou WS Hsiung YB Iijima T 《Physical review letters》2005,94(23):231601
We present a new measurement of CP-violation parameters in B(0)-->K(0)(S)pi(0)gamma decay based on a sample of 275 x 10(6) BB pairs collected at the Gamma(4S) resonance with the Belle detector at the KEKB energy-asymmetric e(+)e(-) collider. One of the B mesons is fully reconstructed in the B(0)-->K(0)(S)pi(0)gamma decay. The flavor of the accompanying B meson is identified from its decay products. CP-violation parameters are obtained from the asymmetry in the distribution of the proper time intervals between the two B decays. We obtain SK(0)(S)(pi(0)gamma) = -0.58(+0.46)(-0.38)(stat) +/- 0.11(syst) and AK(0)(S)(pi(0)gamma) = +0.03 +/- 0.34(stat) +/- 0.11(syst), for the K(0)(S)pi(0) invariant mass covering the full range up to 1.8 GeV/c2. We also measure the CP-violation parameters for the case B(0)-->K(*0)(-->K(0)(S)pi(0))gamma and obtain S(K(*0)gamma) = -0.79(+0.63)(-0.50)(stat) +/- 0.10(syst) for A(K(*0)gamma) fixed at 0. 相似文献
66.
Mizuk R Abe K Abe K Aihara H Akatsu M Asano Y Aulchenko V Aushev T Bakich AM Balagura V Ban Y Banerjee S Bedny I Bitenc U Bizjak I Blyth S Bondar A Bozek A Bracko M Brodzicka J Browder TE Chao Y Chen A Cheon BG Chistov R Choi SK Choi Y Chuvikov A Cole S Dalseno J Danilov M Dash M Dragic J Drutskoy A Eidelman S Fratina S Gabyshev N Garmash A Gershon T Gokhroo G Haba J Hastings NC Hayasaka K Hayashii H Hazumi M Hokuue T Hoshi Y Hou S Hou WS Hsiung YB Iijima T Imoto A Inami K Ishikawa A Itoh R 《Physical review letters》2005,94(12):122002
We report the observation of an isotriplet of excited charmed baryons, decaying into Lambda(+)(c)pi(-), Lambda(+)(c)pi(0), and Lambda(+)(c)pi(+). We measure the mass differences M(Lambda(+)(c)pi)-M(Lambda(+)(c)) and widths to be 515.4(+3.2+2.1)(-3.1-6.0) MeV/c(2), 61(+18+22)(-13-13) MeV for the neutral state; 505.4(+5.8+12.4)(-4.6-2.0) MeV/c(2), 62(+37+52)(-23-38) MeV for the charged state; and 514.5(+3.4+2.8)(-3.1-4.9) MeV/c(2), 75(+18+12)(-13-11) MeV for the doubly charged state, where the uncertainties are statistical and systematic, respectively. These results are obtained from a 281 fb(-1) data sample collected with the Belle detector near the Upsilon(4S) resonance, at the KEKB asymmetric energy e(+)e(-) collider. 相似文献
67.
Wang CC Abe K Abe K Abe T Adachi I Aihara H Asano Y Aushev T Bakich AM Ban Y Bay A Bedny I Bitenc U Bizjak I Blyth S Bondar A Bozek A Bracko M Browder TE Chang P Chao Y Chen KF Chen WT Cheon BG Choi SK Choi Y Chuvikov A Cole S Dash M Dong LY Dragic J Drutskoy A Eidelman S Eiges V Gershon T Gokhroo G Guo R Haba J Hastings NC Hayasaka K Hayashii H Hazumi M Hokuue T Hoshi Y Hou S Hou WS Hsiung YB Iijima T Imoto A Inami K Ishikawa A Ishino H Itoh K Itoh R Iwasaki H Iwasaki Y Kakuno H Kang JH 《Physical review letters》2005,94(12):121801
We present a time-dependent analysis of CP violation in B0-->rho(+/-)pi(-/+) decays based on a 140 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at KEKB. We obtain the charge asymmetry A(rhopi)(CP)=-0.16+/-0.10(stat)+/-0.02(syst). An unbinned maximum-likelihood fit to the Deltat distributions yields C(rhopi)=0.25+/-0.17(stat)+0.02-0.06(syst), DeltaC(rhopi)=0.38+/-0.18(stat)+0.02-0.04(syst), S(rhopi)=-0.28+/-0.23(stat)+0.10-0.08(syst), and DeltaS(rhopi)=-0.30+/-0.24(stat)+/-0.09(syst). The direct CP violation parameters for B-->rho(+)pi(-) and B-->rho(-)pi(+) decays are A(+-)(rhopi)=-0.02+/-0.16(stat)+0.05-0.02(syst) and A(-+)(rhopi)=-0.53+/-0.29(stat)+0.09-0.04(syst). 相似文献
68.
The electrochemical behavior of formaldehyde on tin and indium cathodes has been studied over a wide range of pH (0.4–13), concentrations (1×10?3 to 6×10?1M) and potentials. Potentiostatic, potentiodynamic, ac impedance and photoe mission techniques were used to determine the kinetics of the reaction and to postulate a mechanism. The behavior on indium is similar to that reported on mercury cathodes. Tafel slopes are about 65 to 80 mV/decade. This value indicates that protonation of a reaction intermediate is the rate determining step of the reaction. The value of the slope depends slightly on concentration and pH because of adsorption under Temkin conditions. The reaction order with respect to formaldehyde is close to 1 in the limiting current region, but smaller in the Tafel region. The effect of formaldehyde on tin in neutral and alkaline solutions is to decrease the hydrogen overpotential by about 0.5 V, without affecting the Tafel slope. The rate of formaldehyde reduction is very slow. An explanation for this catalytic effect is postulated, based on the adsorption of formaldehyde-related species on the electrode surface. Formation of bridge-type complexes is also postulated. The exact nature of the adsorbed species is unknown. Preliminary results indicate that the behavior of formaldehyde on lead is similar to that on tin. The influence of this species on the reduction of formic acid on tin and lead is discussed. 相似文献
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70.