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論文

First measurement of differential cross sections and photon beam asymmetries for photoproduction of the $$f_0$$ (980) meson decaying into $$pi^0 pi^0$$ at $$E_gamma <$$ 2.4 GeV

村松 憲仁*; 土川 雄介; LEPS2 BGOegg Collaboration*; 他61名*

Physical Review C, 107(4), p.L042201_1 - L042201_5, 2023/04

https://doi.org/10.1103/PhysRevC.107.L042201
 被引用回数：0 パーセンタイル：0.02(Physics, Nuclear)

For the first time, differential cross sections and photon beam asymmetries were measured for the reaction $$gamma p to f_0 (980) p to pi^0 pi^0 p$$ by using a linearly polarized photon beam up to 2.4 GeV and a liquid hydrogen target. The $$f_0$$ (980) photoproduction signal was clearly observed owing to the absence of contributions from vector-meson photoproduction. The results indicate the $$t$$-channel exchange of vector mesons as a mechanism of the $$f_0$$ (980) photoproduction at $$E_gamma$$ approximate to 2.1 GeV, putting constraints on the nature of $$f_0$$ (980).

論文

$$beta$$ decay of $$^{75}$$Ni and the systematics of the low-lying level structure of neutron-rich odd-$$A$$ Cu isotopes

Bello Garrote, F. L.*; Sahin, E.*; 角田 佑介*; 大塚 孝治*; G$"o$rgen, A.*; Orlandi, R.; 他61名*

Physical Review C, 102(3), p.034314_1 - 034314_13, 2020/09

https://doi.org/10.1103/PhysRevC.102.034314
 被引用回数：4 パーセンタイル：45.12(Physics, Nuclear)

Detailed spectroscopy of neutron-rich odd-$$A$$ Cu isotopes is of great importance for studying the shell evolution in the region of $$^{78}$$Ni. Excited states in $$^{75}$$Cu were populated in the $$beta$$ decay of $$^{75}$$Ni isotopes, which were produced by the in-flight fission at RIBF, RIKEN. The $$^{75}$$Ni isotopes were separated, identified, and implanted in a highly segmented Si detector array for the detection of the $$beta$$-decay electrons, while the delayed $$gamma$$ rays were detected by an array of HPGe cluster detectors. A level scheme of $$^{75}$$Cu was built up to $$sim$$4 MeV, from which the location of the two previously known low-lying isomeric states was clarified. The level structure below 2 MeV was interpreted based on the results of the shell-model calculations and the systematics of odd-$$A$$ Cu isotopes, revealing the evolution of single-particle states in this region.

論文

Search for $$eta$$' bound nuclei in the $$^{12}$$C($$gamma,p$$) reaction with simultaneous detection of decay products

冨田 夏希*; 土川 雄介; LEPS2/BGOegg Collaboration*; 他61名*

Physical Review Letters, 124(20), p.202501_1 - 202501_7, 2020/05

https://doi.org/10.1103/PhysRevLett.124.202501
 被引用回数：9 パーセンタイル：62.22(Physics, Multidisciplinary)

We measured missing mass spectrum of the $$^{12}$$C($$gamma,p$$) reaction for the first time in coincidence with potential decay products from $$eta^prime$$ bound nuclei. We tagged an $$(eta + p)$$ pair associated with the $$eta^prime N to eta N$$ process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section was obtained to be 2.2~nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree $$eta^prime$$ production rate. Our results indicate a small branching fraction of the $$eta^prime N to eta N$$ process and/or a shallow $$eta^prime$$-nucleus potential.

論文

Is seniority a partial dynamic symmetry in the first $$nu$$$$g_{9/2}$$ shell?

Morales, A. I.*; Orlandi, R.; 他61名*

Physics Letters B, 781, p.706 - 712, 2018/06

https://doi.org/10.1016/j.physletb.2018.04.049
 被引用回数：21 パーセンタイル：85.39(Astronomy & Astrophysics)

By studying the $$beta$$ decay of the radioactive nuclei $$^{72}$$Co and $$^{74}$$Co produced at RIBF, RIKEN, the low-lying excited states in $$^{72,74}$$Ni were studied for the first time up to spin 8$$^+$$. These states originate from the valence neutrons occupying the $$g_{9/2}$$ orbit, and permit to investigate the seniority quantum number. The data reveal that the seniority isomerism of the 8$$^+$$ state disappears, and this phenomenon is explained by comparison with shell model calculations and the influence of spherical doubly-magic $$^{78}$$Ni.

論文

Search for the $$Theta^+$$ pentaquark via $$pi^-p rightarrow K^-X$$ reaction at 1.92 GeV/$$c$$

白鳥 昴太郎*; 今井 憲一; 佐甲 博之; 佐藤 進; 杉村 仁志; 市川 裕大; 谷田 聖; 他61名*

Physical Review Letters, 109(13), p.132002_1 - 132002_5, 2012/09

https://doi.org/10.1103/PhysRevLett.109.132002
 被引用回数：31 パーセンタイル：79.11(Physics, Multidisciplinary)

J-PARCの$$pi$$中間子ビームを使って、1.92GeVの$$pi^-prightarrow K^- X$$反応をこれまでにない1.4MeV(FWHM)という高分解能で測定しペンタクォーク$$Theta^+$$を探索した。報告されている$$Theta^+$$の質量領域にはピーク構造は見つからなかった。得られたデータからペンタクォークの生成断面積の上限値として0.26$$mu$$b/srを得た。

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