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Journal Articles

New $$alpha$$-emitting isotope $$^{214}$$U and abnormal enhancement of $$alpha$$-particle clustering in lightest uranium isotopes

Zhang, Z. Y.*; Yang, H. B.*; Andreyev, A. N.; Liu, M. L.*; Ma, L.*; 37 of others*

Physical Review Letters, 126(15), p.152502_1 - 152502_6, 2021/04

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

Journal Articles

Erratum; The Belle II physics book

Kou, E.*; Tanida, Kiyoshi; Belle II Collaboration*; 537 of others*

Progress of Theoretical and Experimental Physics (Internet), 2020(2), p.029201_1 - 029201_6, 2020/02

 Times Cited Count:58 Percentile:100(Physics, Multidisciplinary)

Journal Articles

The Belle II physics book

Kou, E.*; Tanida, Kiyoshi; Belle II Collaboration*; 537 of others*

Progress of Theoretical and Experimental Physics (Internet), 2019(12), p.123C01_1 - 123C01_654, 2019/12

 Times Cited Count:174 Percentile:99.96(Physics, Multidisciplinary)

Journal Articles

First $$gamma$$-ray spectroscopy of an $$sd$$-shell hypernucleus, $$^{19}_{Lambda}$$F

Yang, S. B.*; Hasegawa, Shoichi; Hayakawa, Shuhei*; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Tamura, Hirokazu*; Tanida, Kiyoshi; et al.

JPS Conference Proceedings (Internet), 26, p.023015_1 - 023015_5, 2019/11

Journal Articles

First determination of the level structure of an $$sd$$-shell hypernucleus, $$^{19}_{Lambda}$$F

Yang, S. B.*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; et al.

Physical Review Letters, 120(13), p.132505_1 - 132505_5, 2018/03

 Times Cited Count:5 Percentile:54.08(Physics, Multidisciplinary)

Journal Articles

Spectroscopy of nuclei with multi-strangeness by using new S-2S spectrometer at J-PARC

Gogami, Toshiyuki*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Ichikawa, Yudai; Nanamura, Takuya; Naruki, Megumi; Sako, Hiroyuki; et al.

JPS Conference Proceedings (Internet), 18, p.011031_1 - 011031_6, 2017/11

Journal Articles

Observation of the "$$K^-pp$$"-like structure in the $$d(pi^+, K^+)$$ reaction at 1.69 GeV/$$c$$

Ichikawa, Yudai; Hasegawa, Shoichi; Hosomi, Kenji; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; 37 of others*

Progress of Theoretical and Experimental Physics (Internet), 2015(2), p.021D01_1 - 021D01_8, 2015/02

 Times Cited Count:63 Percentile:94.35(Physics, Multidisciplinary)

We have observed a "$$K^-pp$$"-like structure in the $$d(pi^+,K^+)$$ reaction at 1.69 GeV/$$c$$. In this reaction a $$Lambda(1405)$$ hyperon resonance is expected to be produced as a doorway to form $$K^-pp$$ through the $$Lambda^*prightarrow K^-pp$$ process. However, most of the $$Lambda(1405)$$ produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum ($$>$$ 250 MeV/$$c$$) proton(s)at large emission angles ($$39^circ<theta_{rm lab.}<122 circ$$) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV/$$c^2$$, which corresponds to the $$K^-pp$$ binding energy of 95 $$^{+18}_{-17}$$ (stat.) $$^{+30}_{-21}$$ (syst.) MeV and the width of 162 $$^{+87}_{-45}$$ (stat.) $$^{+66}_{-78}$$ (syst.) MeV.

Journal Articles

Inclusive spectrum of the $$d(pi^{+}, K^{+})$$ reaction at 1.69 GeV/$$c$$

Ichikawa, Yudai; Hasegawa, Shoichi; Hosomi, Kenji; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; 37 of others*

Progress of Theoretical and Experimental Physics (Internet), 2014(10), p.101D03_1 - 101D03_8, 2014/10

 Times Cited Count:14 Percentile:69.89(Physics, Multidisciplinary)

We have measured an inclusive missing-mass spectrum of the $$d(pi^+, K^+)$$ reaction at the pion incident momentum of 1.69 GeV/$$c$$ at the laboratory scattering angles between 2$$^{circ}$$ and 16$$^{circ}$$ with the missing-mass resolution of 2.7 $$pm$$ 0.1 MeV/$$c^2$$ (FWHM) at the missing mass of 2.27 GeV/$$c^{2}$$. While gross spectrum structures are well understood in the simple quasi-free picture, we have observed two distinct deviations; one peculiar enhancement at2.13 GeV/$$c^2$$ is due to the $$Sigma N$$ cusp, and the other notable feature is a shift of a broad bump structure, mainly originating from hyperon resonance productions of $$Lambda(1405)$$ and $$Sigma(1385)^{+/0}$$, by about 22.4 $$pm$$ 0.4 (stat.) $$^{+2.7}_{-1.7}$$ (syst.) MeV/$$c^2$$ toward the low-mass side, which is calculated in the kinematics of a proton at rest as the target.

Journal Articles

Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in $$vec{p}$$ + $$vec{p}$$ collisions at $$sqrt{s}$$ = 200 GeV

Imai, Kenichi; Tanida, Kiyoshi; PHENIX Collaboration*; 378 of others*

Physical Review D, 90(1), p.012007_1 - 012007_19, 2014/07

AA2014-0582.pdf:1.66MB

 Times Cited Count:48 Percentile:89.19(Astronomy & Astrophysics)

Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, $$A_{LL}$$ for $$pi^0$$ and $$eta$$ production in $$sqrt{s}$$ = 200 GeV polarized $$vec{p}$$ + $$vec{p}$$ collisions. The effect of adding the new 2009 $$pi^0$$ data to a recent global analysis of polarized scattering data is shown, resulting in a best fit value $$Delta G$$ = 0.06 $$_{-0.15}^{+0.11}$$ in the range 0.05 $$<x<$$ 0.2.

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