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Journal Articles

$$Lambda(1405)$$ as a $$bar{K}N$$ Feshbach resonance in the Skyrme model

Ezoe, Takashi*; Hosaka, Atsushi

Physical Review D, 102(1), p.014046_1 - 014046_9, 2020/07

Journal Articles

New measurement of the $$^{8}$$Li($$alpha$$,n)$$^{11}$$B reaction in a lower-energy region below the Coulomb barrier

Das, S. K.*; Fukuda, Tomokazu*; Mizoi, Yutaka*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Jeong, S. C.*; Ikezoe, Hiroshi*; Matsuda, Makoto; et al.

Physical Review C, 95(5), p.055805_1 - 055805_4, 2017/05

 Times Cited Count:1 Percentile:27.8(Physics, Nuclear)

Journal Articles

A New measurement of the astrophysical $$^8$$Li(d,t)$$^7$$Li reaction

Hashimoto, Takashi; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari; Jeong, S.-C.*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Nomura, Toru*; et al.

Physics Letters B, 674(4-5), p.276 - 280, 2009/04

 Times Cited Count:6 Percentile:43.52(Astronomy & Astrophysics)

The excitation function of the $$^8$$Li(d,t)$$^7$$Li reaction was directly measured using $$^8$$Li beams at E$$_{mathrm{cm}}$$ = 0.3, 0.4, 0.5, 0.7, 0.8, 1.0, 1.1, and 1.2 MeV with CD$$_2$$ targets. The beam energies covered the Gamow peaks for 1$$sim$$3$$times$$10$$^9$$ K. Large cross sections were observed at around E$$_{mathrm{cm}}$$ = 0.8 MeV, implying a resonance state located at 22.4 MeV in $$^{10}$$Be. The present astrophysical reaction rate is higher in one order magnitude than the presently adopted rate at around 1$$times$$10$$^9$$ K.

Journal Articles

A New measurement of the astrophysical $$^8$$Li($$alpha$$, n)$$^{11}$$B reaction

Ishiyama, Hironobu*; Hashimoto, Takashi; Ishikawa, Tomoko*; Watanabe, Yutaka*; Das, S. K.*; Miyatake, Hiroari; Mizoi, Yutaka*; Fukuda, Tomokazu*; Tanaka, Masahiko*; Fuchi, Yoshihide*; et al.

Physics Letters B, 640(3), p.82 - 85, 2006/09

 Times Cited Count:32 Percentile:85.01(Astronomy & Astrophysics)

The excitation function of the $$^{8}$$Li($$alpha$$,n)$$^{11}$$B reaction was measured while identifying the final state event by event in the region of E$$_{rm{cm}}$$ = 0.7 - 2.6 MeV using a highly efficient detector system and a low-energy $$^8$$Li beam. The results are much improved both in statistics and precisions, and show smaller cross sections than those of previous measurements by a factor of more than 2 in the low-energy region of E$$_{rm{cm}}le$$ 1.5 MeV. A resonance-like structure is found at around E$$_{rm{cm}}$$ = 0.85 MeV.

Journal Articles

A New measurement of the $$^8$$Li($$alpha$$,n)$$^{11}$$B reaction for astrophysical interest

Das, S. K.*; Fukuda, Tomokazu*; Mizoi, Yutaka*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Jeong, S.-C.*; et al.

AIP Conference Proceedings 847, p.374 - 376, 2006/07

no abstracts in English

Journal Articles

Production of a low-energy radioactive nuclear beam with high purity using JAERI-RMS

Ishiyama, Hironobu*; Ishikawa, Tomoko*; Hashimoto, Takashi; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari; Tanaka, Masahiko*; Fuchi, Yoshihide*; Yoshikawa, Nobuharu*; et al.

Nuclear Instruments and Methods in Physics Research A, 560(2), p.366 - 372, 2006/05

 Times Cited Count:7 Percentile:47.55(Instruments & Instrumentation)

Thanks to the nature of inverse transfer-reactions, low-energy radioactive nuclear beams in light neutron-rich region were produced. The mass-separation and velocity-separation of the JAERI recoil mass-separator help to form high purity beams. The beams of $$^8$$Li, $$^{12}$$B, and $$^{16}$$N-RNBs are utilized to the experiments, so far, with those beam intensities and purities of 1.4$$times$$10$$^4$$ pps and 99$$%$$, 7.8$$times$$10$$^3$$ pps and 98$$%$$, and 4.7$$times$$10$$^3$$ pps and 98.5$$%$$, respectively.

Journal Articles

Gated multiple-sampling and tracking proportional chamber; New detector system for nuclear astrophysical study with radioactive nuclear beams

Hashimoto, Takashi; Ishiyama, Hironobu*; Ishikawa, Tomoko*; Kawamura, Takashi*; Nakai, Koji*; Watanabe, Yutaka*; Miyatake, Hiroari; Tanaka, Masahiko*; Fuchi, Yoshihide*; Yoshikawa, Nobuharu*; et al.

Nuclear Instruments and Methods in Physics Research A, 556(1), p.339 - 349, 2006/01

 Times Cited Count:32 Percentile:89.13(Instruments & Instrumentation)

A new type of three dimensional tracking and proportional gas counter has been developed. Adopting a gating-grid system, performance of the detector becomes stable under the injection rate of charged particles less than 4$$times$$10$$^4$$ pps. It is a useful detection system for astrophysical experiments using radioactive nuclear beams, since the efficiency is so high as 100 %.

Oral presentation

Study of astrophysical ($$alpha$$,n) reactions on light neutron-rich nuclei using low-energy radioactive nuclear beams

Hashimoto, Takashi; Mitsuoka, Shinichi; Ichikawa, Shinichi; Ikezoe, Hiroshi; Miyatake, Hiroari; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Tanaka, Masahiko*; et al.

no journal, , 

no abstracts in English

Oral presentation

Direct measurements of astrophysical nuclear reaction rates on light neutron-rich nuclei at TRIAC and JAEA-RMS

Miyatake, Hiroari; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Jeong, S.-C.*; Fuchi, Yoshihide*; Nomura, Toru*; et al.

no journal, , 

no abstracts in English

Oral presentation

Direct measurement of the $$^{8}$$Li(d,t)(d,p)(d,$$alpha$$) reaction cross sections

Hashimoto, Takashi; Ishiyama, Hironobu*; Hirayama, Yoshikazu*; Watanabe, Yutaka*; Imai, Nobuaki*; Miyatake, Hiroari; Jeong, S.-C.*; Yoshikawa, Nobuharu*; Tanaka, Masahiko*; Nomura, Toru*; et al.

no journal, , 

no abstracts in English

Oral presentation

A Systematic study of astrophysical nuclear reaction rates via $$^8$$Li

Miyatake, Hiroari; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Jeong, S.-C.*; Fuchi, Yoshihide*; Nomura, Toru*; et al.

no journal, , 

A systematic study of astrophysical reaction rates on light neutron-rich nuclei using low-energy radioactive nuclear beams (RNB) is in progress at the tandem facility of Japan Atomic Energy Agency (JAEA). Direct measurements of reaction rates of $$^8$$Li($$alpha$$, n)$$^{11}$$B, $$^{12}$$B($$alpha$$, n)$$^{15}$$N and, $$^8$$Li(d, p), (d, t), (d, $$alpha$$), (p, $$alpha$$) have been carried out. Measured excitation functions and obtained reaction rates will be presented. Possible r-process path via $$^8$$Li at each temperature during r-process and the influence of r-process abundance will be discussed.

Oral presentation

Barrier distribution in heavy-ion reaction with deformed nucleus

Mitsuoka, Shinichi; Ikezoe, Hiroshi; Nishio, Katsuhisa; Hashimoto, Takashi; Jeong, S.-C.*; Watanabe, Yutaka*; Miyatake, Hiroari; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*

no journal, , 

no abstracts in English

Oral presentation

Direct measurements of the astrophysical $$^8$$Li(d,t),(d,p),(d,$$alpha$$) reactions

Hashimoto, Takashi; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari; Jeong, S.-C.*; Tanaka, Masahiko*; Nomura, Toru*; Okada, Masayuki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Properties of the kaon-nucleon system and $$Lambda(1405)$$ in the Skyrme model

Ezoe, Takashi; Hosaka, Atsushi; Maruyama, Toshiki

no journal, , 

The kaon-nucleon systems and the $$Lambda(1405)$$ has been receiving a lot of attention in hadron physics. For example, the antikaon and nucleon interaction is considered strongly attractive. Due to the strong attraction, they form a bound state which was identified with the $$Lambda(1405)$$. It is one of the most famous resonance states whose detailed properties are yet under debate in hadron physics. In this study, we have investigated the kaon-nucleon systems and the $$Lambda(1405)$$ in the Skyrme model, where the baryon is described as a soliton with the finite structures. As a result, we have obtained the (anti)kaon-nucleon potential as a function depending on the radial distance and we discuss the decay of the $$Lambda(1405)$$ taking into account the baryon structures.

Oral presentation

Structure of the $$Lambda(1405)$$ in the Skyrme model

Ezoe, Takashi; Hosaka, Atsushi; Maruyama, Toshiki

no journal, , 

The kaon-nucleon systems and the $$Lambda(1405)$$ have drawn attention in hadron physics. For example, the antikaon-nucleon ($$bar{K}N$$) interaction is considered to be strongly attractive. It was considered that, due to the strong attraction, they formed a bound state which was identified with the $$Lambda(1405)$$. It is well-known as a candidate of the exotic hadron, whose properties cannot be explained by a simple quark model. Now, the $$Lambda(1405)$$ is considered to be a resonance state of the $$bar{K}N$$ and $$pi Sigma$$ channels. There are many theoretical works for the $$Lambda(1405)$$, which are based on a phenomenological approach or chiral theories. In this study, we investigate the $$Lambda(1405)$$ by the Skyrme model which is based on the chiral theory and able to describe the hadron properties well. Furthermore, we can discuss three-dimensional structure of baryons since the model describes the baryon as a soliton with finite size. We have found a loosely bound $$bar{K}N$$ state with the binding energy of order 10 MeV. Actually, we discuss the size of the bound state and found its size to be 1.2 fm, which is larger than the nucleon size in the Skyrme model (0.6 fm).

Oral presentation

Structures of the $$Lambda (1405)$$ in the Skyrme model

Ezoe, Takashi; Hosaka, Atsushi; Maruyama, Toshiki

no journal, , 

The $$Lambda (1405)$$ is well-known as a candidate of the exotic hadron whose properties can not be easily explained by a simple three-quark state. To determine the properties of the $$Lambda (1405)$$ is one of the most important tasks in hadron physics. Recently, the $$Lambda (1405)$$ is considered to be a resonance of the $$bar{K}N$$ and $$pi Sigma$$ channels, which is well-known as the double-pole structure. To investigate the $$Lambda (1405)$$, as a first step, we have considered the $$bar{K}N$$ channel by the Skyrme model, which is able to describe the hadron properties well and describes baryon as a soliton with structure of finite size. As a result, we have found one bound state with the binding energy of order 10 MeV, which means that the $$bar{K}N$$ bound state is a weakly binding object of the $$bar{K}$$ and $$N$$. We shall include the coupling of $$bar{K}N$$ and $$piSigma$$ channels as a next step.

Oral presentation

Study of the $$Lambda (1405)$$ in the Skyrme model, 3

Ezoe, Takashi; Hosaka, Atsushi; Maruyama, Toshiki

no journal, , 

To determine properties of the $$Lambda (1405)$$ resonance is one of the important tasks in hadron physics. The $$Lambda (1405)$$ is well-known as a candidate of the exotic hadrons, whose properties can not be easily explained by a simple three-quark state. In our previous works, we have considered the $$bar{K}N$$ system in the Skyrme model, where baryons emerge as solitons with a finite size and baryon properties are reproduced well. We have constructed a new approach to describe kaon-nucleon systems in the Skyrme model. As a result, we have find one bound state with the binding energy of order 10 MeV, which means that the $$bar{K}N$$ bound state is realized as a hadronic molecule in our approach. In this talk, we investigate $$Lambda (1405)$$ as a $$bar{K}N$$ Feshbach resonance. The decay width of it seems to be very narrow. It means that we have succeeded in describing the $$Lambda (1405)$$ as a molecular resonance.

17 (Records 1-17 displayed on this page)
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