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論文

Nuclear structure of Te isotopes beyond neutron magic number $$N$$ = 82

Moon, B.*; Jungclaus, A.*; Na$"i$dja, H.*; Gargano, A.*; Lozeva, R.*; Moon, C.-B.*; Orlandi, R.; 他66名*

Physical Review C, 103(3), p.034320_1 - 034320_15, 2021/03

https://doi.org/10.1103/PhysRevC.103.034320
 被引用回数：9 パーセンタイル：72.28(Physics, Nuclear)

At RIKEN RIBF facility, the beta decay of $$^{137}$$Sb and $$^{138}$$Sb were studied and several new excited states were assigned to the level schemes of $$^{137}$$Te and $$^{138}$$Te. The structure of these Te isotopes deduced from the level scheme is compared with state-of-the-art shell-model calculations using different effective interactions. The comparison with calculations permits to determine the spectroscopic factors and deformation of these isotopes close to doubly magic $$^{132}$$Sn.

論文

Observation of a $$bar{K}NN$$ bound state in the $$^{3}$$He $$(K^-, Lambda p)n$$ reaction

山我 拓巳*; 橋本 直; 谷田 聖; 他66名*

Physical Review C, 102(4), p.044002_1 - 044002_14, 2020/10

https://doi.org/10.1103/PhysRevC.102.044002
 被引用回数：21 パーセンタイル：87.31(Physics, Nuclear)

We have performed an exclusive measurement of the $$K^{-}+! ~^{3}{rm He} to Lambda pn$$ reaction at an incident kaon momentum of $$1 {rm GeV}/c$$. In the $$Lambda p$$ invariant mass spectrum, a clear peak was observed below the mass threshold of $$bar{K}+N+N$$, as a signal of the kaonic nuclear bound state, $$bar{K}NN$$. The binding energy, decay width, and $$S$$-wave Gaussian reaction form-factor of this state were observed to be $$B_{K} = 42pm3({rm stat.})^{+3}_{-4}({rm syst.}) {rm MeV}$$, $$Gamma_{K} = 100pm7({rm stat.})^{+19}_{-9}({rm syst.}) {rm MeV}$$, and $$Q_{K} = 383pm11({rm stat.})^{+4}_{-1}({rm syst.}) {rm MeV}/c$$, respectively. The total production cross-section of $$bar{K}NN$$, determined by its $$Lambda p$$ decay mode, was $$sigma^{tot}_{K} cdot BR_{Lambda p} = 9.3pm0.8({rm stat.})^{+1.4}_{-1.0}({rm syst.}) mu{rm b}$$. We estimated the branching ratio of the $$bar{K}NN$$ state to the $$Lambda p$$ and $$Sigma^{0}p$$ decay modes as $$BR_{Lambda p}/BR_{Sigma ^{0}p} sim 1.7$$, by assuming that the physical processes leading to the $$Sigma N!N$$ final states are analogous to those of $$Lambda pn$$.

論文

$$K^-pp$$ bound system at J-PARC

佐久間 史典*; 橋本 直; 谷田 聖; 他66名*

AIP Conference Proceedings 2249, p.020005_1 - 020005_10, 2020/07

https://doi.org/10.1063/5.0008808
 被引用回数：1 パーセンタイル：62.10(Physics, Applied)

The $$bar{K}NN$$ bound system, symbolically denoted as "$$K^-pp$$", is the simplest $$bar{K}$$-nuclear bound system which has been widely discussed as a consequence of the strongly attractive $$bar{K}N$$ interaction in $$I = 0$$ channels. Many theoretical works have pointed out the existence of the "$$K^-pp$$" bound system, but the calculated properties such as the binding energy and the width spread out due to the uncertainty of the $$bar{K}N$$ interaction below the $$bar{K}+N$$ mass threshold. Experimentally, there are several reports on observation of a "$$K^-pp$$" candidate with the binding energy of around 100 MeV, however, no definitive evidence was available so far. At J-PARC, we conducted a experimental search for the "$$K^-pp$$" bound system using $$K^- + ^3$$He reaction at 1.0 GeV/$$c$$ where the "$$K^-pp$$" is expected to be directly produced via the $$(K^-, n)$$ reaction. We finally observed a bound state below the $$K^- +p+p$$ mass threshold in the $$Lambda pn$$ final state, which can be interpreted as the "$$K^- pp$$" bound state. The possible existence of the "$$K^- pp$$" state is discussed from both aspects of production and decay.

論文

$$bar{K}$$-nuclear bound state at J-PARC

佐久間 史典*; 橋本 直; 谷田 聖; 他66名*

JPS Conference Proceedings (Internet), 32, p.010088_1 - 010088_8, 2020/07

BB2021-0624.pdf:1.79MB

https://doi.org/10.7566/JPSCP.32.010088

$$bar{K}$$-nuclear bound states have been widely discussed as a consequence of the strongly attractive $$bar{K}N$$ interaction in $$I = 0$$ channels. Especially, the simplest $$bar{K}$$-nuclear bound state of $$bar{K}NN$$ (denoted as "$$K^-pp$$") has attracted the strong interest both of theoretical and experimental studies. We observed a bound state below the $$K^- + p + p$$ mass threshold with in-flight $$K^-$$ induced reactions on $$^3$$He target, which can be interpreted as the "$$K^-pp$$" bound state. The possible existence of the "$$K^-pp$$" state is discussed from both aspects of production and decay: "$$K^-pp$$" and $$Lambda(1405)p$$ productions, and non-mesonic $$Lambda p$$ and mesonic $$(pi Sigma)^0p$$ decays, respectively.

論文

Results of $$bar{K}NN$$ search via the $$(K^-, n)$$ reaction at J-PARC

山我 拓巳*; 橋本 直; 谷田 聖; 他66名*

JPS Conference Proceedings (Internet), 26, p.023008_1 - 023008_6, 2019/11

https://doi.org/10.7566/JPSCP.26.023008

There is a long-standing argument of the existence of kaonic nucleus, which is a bound state of anti-kaon and nucleus. Theoretically, its existence is strongly supported, however its binding energy and width have not been established yet. It is strongly desired to have an experiment to investigate the simplest kaonic nucleus, so-called $$K^-pp$$ bound state. We performed an experiment to search for $$K^-pp$$ via the in-flight $$(K^-, n)$$ reaction at J-PARC. By studying $$Lambda p$$ invariant mass spectrum in the $$Lambda pn$$ final state and its dependence on momentum transfer of $$K^{-}N to bar{K}N$$, we observed a resonant state located below $$M_{K^{-}pp}$$. The mass and width of this resonant state are $$2324 pm 3(textit{stat}.)_{-3}^{+6}(textit{syst}.)$$ MeV/$$c^2$$, and $$115 pm 7(textit{stat}.)_{-20}^{+10}(textit{syst}.)$$ MeV, respectively, which can be naturally interpreted as a theoretically predicted $$K^-pp$$ bound state.

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