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論文

First spectroscopic study of odd-odd $$^{78}$$Cu

Pedersen, L. G.*; Sahin, E.*; G$"o$rgen, A.*; Bello Garrote, F. L.*; 角田 佑介*; 大塚 孝治*; 新倉 潤*; Orlandi, R.; 他59名*

Physical Review C, 107(4), p.044301_1 - 044301_10, 2023/04

https://doi.org/10.1103/PhysRevC.107.044301
 被引用回数：3 パーセンタイル：47.61(Physics, Nuclear)

Nuclei in the vicinity of $$^{78}$$Ni ($$Z$$=28, $$N$$=50) are important benchmarks to study the evolution of shell structure far from stability. Excited states in $$^{78}$$Cu were observed for the first time following the $$beta$$-decay of $$^{78}$$Ni, which was produced by in-flight fission of $$^{238}$$U. Using $$gamma$$-ray coincidences, a level scheme comprising eight excited states was built. Using the observed $$beta$$ feeding and the $$gamma$$-decay properties of the excited states, spin was tentatively assigned to 5 new states. In addition to the $$gamma$$-decaying states, an isomeric state with a lifetime of 3.8(4) ms was found to decay by internal conversion. By comparing the results with large scale shell model calculations, quantitative information about the proton-neutron interaction outside the doubly magic $$^{78}$$Ni core was obtained.

論文

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

七村 拓野; 藤田 真奈美; 長谷川 勝一; 市川 真也; 市川 裕大; 今井 憲一*; 成木 恵; 佐藤 進; 佐甲 博之; 田村 裕和; et al.

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

https://doi.org/10.1093/ptep/ptac101
 被引用回数：16 パーセンタイル：81.30(Physics, Multidisciplinary)

We performed a novel $$Sigma^+p$$ scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 $$Sigma^+p$$ elastic scattering events were identified from $$4.9 times 10^7$$ tagged $$Sigma^+$$ particles in the $$Sigma^+$$ momentum range 0.44 - 0.80 GeV/c. The differential cross sections of the $$Sigma^+p$$ elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the $$^3S_1$$ and $$^1P_1$$ channels for the first time. The phase shift of the 3S1 channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated to be $$20^circ<|delta_{^3S_1}|<35^circ$$. If the sign of $$delta_{^3S_1}$$ is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.

論文

Precise measurement of differential cross sections of the $${Sigma}^- p to {Lambda} n$$ reaction in momentum range 470-650 MeV/$$c$$

三輪 浩司*; 藤田 真奈美; 長谷川 勝一; 細見 健二; 市川 裕大*; 今井 憲一*; 七村 拓野; 佐甲 博之; 佐藤 進; 田村 裕和; et al.

Physical Review Letters, 128(7), p.072501_1 - 072501_6, 2022/02

https://doi.org/10.1103/PhysRevLett.128.072501
 被引用回数：20 パーセンタイル：86.56(Physics, Multidisciplinary)

The differential cross sections of the $${Sigma}^- p to {Lambda} n$$ reaction were measured accurately for the $${Sigma}^-$$ momentum $$(p_{{Sigma}})$$ ranging from 470 to 650 MeV/$$c$$ at the J-PARC Hadron Experimental Facility. Precise angular information about the $${Sigma}^- p to {Lambda} n$$ reaction was obtained for the first time by detecting approximately 100 reaction events at each angular step of $${Delta}cos{theta} = 0.1$$. The obtained differential cross sections show slightly forward-peaking structure in the measured momentum regions. The cross sections integrated for $$-0.7 < cos{theta} < 1.0$$ were obtained as $$22.5 pm 0.68 (stat.) pm 0.65 (syst.)$$ mb and $$15.8 pm 0.83(stat.) pm 0.52 (syst.)$$ mb for $$470 < p_{{Sigma}}$$ (MeV/c) $$<550$$ and $$550 < p_{{Sigma}}$$ (MeV/c)$$<650$$, respectively. These results show a drastic improvement compared to past measurements of the hyperon-proton scattering experiments. They will play essential roles in updating the theoretical models of the baryon-baryon interactions.

論文

Differential cross sections, photon beam asymmetries, and spin density matrix elements of $$omega$$ photoproduction off the proton at $$E_gamma$$ = 1.3-2.4 GeV

村松 憲仁*; 土川 雄介; LEPS2/BGOegg Collaboration*; 他59名*

Physical Review C, 102(2), p.025201_1 - 025201_10, 2020/08

https://doi.org/10.1103/PhysRevC.102.025201
 被引用回数：9 パーセンタイル：64.54(Physics, Nuclear)

For the reaction $$gamma p to omega p$$, differential cross sections, photon beam asymmetries, and spin density matrix elements have been measured in the BGOegg experiment at the SPring-8 LEPS2 beamline by using a large acceptance electromagnetic calorimeter. A 1.3-2.4 GeV photon beam with high linear polarization has enabled a precision measurement of photon beam asymmetries $$Sigma$$ and polarized spin density matrix elements $$rho^1_{1-1}$$ over a wide angular range, especially above the total energy of about 2 GeV for the first time. The measured $$rho^1_{1-1}$$ indicates the dominance of $$s$$-channel resonances even at higher energies. The $$Sigma$$ values at backward angles are not reproduced by the existing partial-wave analysis in the highest-energy region, providing new constraints to the contribution of nucleon resonances with high spins.

論文

Measurement of time-dependent $$CP$$ violation in $$B^0 to K^0_S pi^0 pi^0$$ decays

遊佐 洋右*; 谷田 聖; Belle Collaboration*; 他159名*

Physical Review D, 99(1), p.011102_1 - 011102_7, 2019/01

AA2019-0530.pdf:0.33MB

https://doi.org/10.1103/PhysRevD.99.011102
 被引用回数：2 パーセンタイル：11.13(Astronomy & Astrophysics)

We report a measurement of time-dependent $$CP$$ violation in $$B^0 to K^0_S pi^0 pi^0$$ decays using a data sample of $$772 times 10^6$$ $$Bbar{B}$$ pairs collected by the Belle experiment running at the $$Upsilon (4S)$$ resonance at the KEKB $$e^+ e^-$$ collider. This decay proceeds mainly via a $$bto sdbar{d}$$ "penguin" amplitude. The results are $$sin 2phi^{rm eff}_1 = 0.92^{+0.27}_{-0.31}~$$ (stat.) $$pm 0.11$$ (syst.) and $$mathcal{A} = 0.28 pm 0.21$$ (stat.) $$pm 0.04$$ (syst.), which are the most precise measurements of $$CP$$ violation in this decay mode to date. The value for the $$CP$$-violating parameter $$sin 2phi^{rm eff}_1$$ is consistent with that obtained using decay modes proceeding via a $$bto cbar{c}s$$ "tree" amplitude.

論文

Spectroscopic experiment of $$Lambda(1405)$$ via the in-flight $$d(K^-, n)$$ reaction at J-PARC K1.8BR

川崎 新吾*; 橋本 直*; 谷田 聖; 他59名*

JPS Conference Proceedings (Internet), 13, p.020018_1 - 020018_5, 2017/02

https://doi.org/10.7566/JPSCP.13.020018
 被引用回数：2 パーセンタイル：74.02(Physics, Particles & Fields)

Experimental investigation of $$Lambda(1405)$$ via the in-flight $$d(K^-, n)$$ reaction is being performed at the J-PARC K1.8BR beam-line (J-PARC E31). The first E31 physics run was carried out in June, 2016. About $$2.7 times 10^{10}$$ kaons were irradiated on the deuteron target. The missing mass spectra of the $$d(K^-, n)$$"$$Sigma^{ mp }pi^{pm}$$" reactions were measured. The difference between the two spectra was observed clearly, which tells us the existence of the interference term between the isospin $$I$$ = 0 and 1 amplitudes. The missing mass spectrum of the $$d(K^-, p)$$"$$Sigma^0pi^-$$" reaction was also measured, which gives the information on the $$I$$ =1 amplitude. The identification of the $$d(K^-, n)$$"$$Sigma^0pi^0$$" reaction seems successful.

論文

Observation of $$Z_b(10610)$$ and $$Z_b(10650)$$ decaying to $$B$$ mesons

Garmash, A.*; 谷田 聖; Belle Collaboration*; 他159名*

Physical Review Letters, 116(21), p.212001_1 - 212001_7, 2016/05

AA2016-0341.pdf:0.34MB

https://doi.org/10.1103/PhysRevLett.116.212001
 被引用回数：79 パーセンタイル：92.96(Physics, Multidisciplinary)

We report the analysis of the three-body $$e^+e^- to Bbar{B}pi^{pm}$$, $$Bbar{B}^*pi^{pm}$$, $$B^*bar{B}^*pi^{pm}$$ processes, including the first observations of the $$Z_b(10610) to [Bbar{B}^*+ c.c.]^{pm}$$ and $$Z_b(10650) to [B^*bar{B}^*]^{pm}$$ transitions that are found to dominate the corresponding final states. We measure Born cross sections for the three-body production of $$sigma(e^+e^- to [Bbar{B}^*+ c.c.]^{pm}pi^{mp})=[17.4pm 1.6({rm stat.}) pm 1.6({rm syst.})]$$ pb and $$sigma(e^+e^- to [B^*bar{B}^*]^{pm}pi^{mp})= [8.75 pm 1.15({rm stat.}) pm 1.04({rm syst.})]$$ pb and set a 90% C.L. upper limit of $$sigma(e^+e^- to [Bbar{B}]^{pm}pi^{mp}) < 2.9$$ pb. The results are based on a 121.4 fb$$^{-1}$$ data sample collected with the Belle detector at a center-of-mass energy near the $$Upsilon(10860)$$ peak.

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