atomic X-ray spectroscopy using a counter-emulsion hybrid method

Fujita, Manami; Hasegawa, Shoichi; Hosomi, Kenji; Ichikawa, Masaya; Ichikawa, Yudai; Kim, S.; Nanamura, Takuya; Sako, Hiroyuki; Tamura, Hirokazu; Yamamoto, Takeshi; et al.

Progress of Theoretical and Experimental Physics (Internet), 2022(12), p.123D01_1 - 123D01_17, 2022/12

https://doi.org/10.1093/ptep/ptac156

Kaon-baryon coupling schemes and kaon condensation in hyperon-mixed matter

Muto, Takumi*; Maruyama, Toshiki; Tatsumi, Toshitaka*

Progress of Theoretical and Experimental Physics (Internet), 2022(9), p.093D03_1 - 093D03_37, 2022/09

https://doi.org/10.1093/ptep/ptac115

Two-dimensional resistive-wall impedance with finite thickness; Its mathematical structures and their physical meanings

Shobuda, Yoshihiro

Progress of Theoretical and Experimental Physics (Internet), 2022(5), p.053G01_1 - 053G01_44, 2022/05

https://doi.org/10.1093/ptep/ptac053

When the skin depth is greater than the chamber thickness for relativistic beams, the two-dimensional longitudinal resistive-wall impedance of a cylindrical chamber with a finite thickness decreases proportionally to the frequency. The phenomenon is commonly interpreted as electro-magnetic fields leaking out of the chamber over a frequency range. However, the relationship between the wall current on the chamber and the leakage fields from the chamber is unclear because the naive resistive-wall impedance formula does not dynamically express how the wall current converts to the leakage fields when the skin depth exceeds the chamber thickness. A prestigious textbook {Kheifets} re-expressed the resistive-wall impedance via a parallel circuit model with the resistive-wall and inductive terms to provide a dynamic picture of the phenomenon. However, there are some flaws in the formula. From a fundamental standpoint, this study highlights them and provides a more appropriate and rigorous picture of the longitudinal resistive-wall impedance with finite thickness. To demonstrate their physical meaning, we re-express the longitudinal impedance for non-relativistic beams, as well as the transverse resistive-wall impedance including space charge impedance based on a parallel circuit model.

Gamow-Teller transitions of neutron-rich = 82, 81 nuclei by shell-model calculations

Shimizu, Noritaka*; Togashi, Tomoaki*; Utsuno, Yutaka

Progress of Theoretical and Experimental Physics (Internet), 2021(3), p.033D01_1 - 033D01_15, 2021/03

AA2020-0889.pdf:1.07MB

https://doi.org/10.1093/ptep/ptab022

no abstracts in English

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

https://doi.org/10.1093/ptep/ptaa008

Conceptual study on parasitic low-energy RI beam production with in-flight separator BigRIPS and the first stopping examination for high-energy RI beams in the parasitic gas cell

Sonoda, Tetsu*; Katayama, Ichiro*; Wada, Michiharu*; Iimura, Hideki; Sonnenschein, V.*; Iimura, Shun*; Takamine, Aiko*; Rosenbusch, M.*; Kojima, Takao*; Ahn, D. S.*; et al.

Progress of Theoretical and Experimental Physics (Internet), 2019(11), p.113D02_1 - 113D02_12, 2019/11

AA2019-0315.pdf:1.37MB

https://doi.org/10.1093/ptep/ptz120

An in-flight separator, BigRIPS, at RIBF in RIKEN provides each experiment with specific nuclides separated from many nuclides produced by projectile fragmentation or in-flight fission. In this process, nuclides other than separated ones are discarded on the slits in BigRIPS, although they include many nuclides interested from the view point of nuclear structure. In order to extract these nuclides for parasitic experiments, we are developing a method using laser ion-source (PALIS). A test experiment with Se beam from RIBF has been performed by using a gas cell set in BigRIPS. Unstable nuclides around Se were stopped in the gas cell in accordance with a calculation using LISE code. The stopping efficiency has been estimated to be about 30%. As a next step, we will establish the technique for extracting reaction products from the gas cell.

Trapping probability of strangeness via hyperon capture at rest in nuclear emulsion

Theint, A. M. M.*; Ekawa, Hiroyuki; Yoshida, Junya; 7 of others*

Progress of Theoretical and Experimental Physics (Internet), 2019(2), p.021D01_1 - 021D01_10, 2019/02

https://doi.org/10.1093/ptep/pty147

Evaluation of the frequency dependence of the complex conductivity of a resistive chamber by comparing theoretical and measured -matrices

Shobuda, Yoshihiro

Progress of Theoretical and Experimental Physics (Internet), 2018(12), p.123G01_1 - 123G01_52, 2018/12

AA2018-0701.pdf:3.35MB

https://doi.org/10.1093/ptep/pty124

For an accurate calculation of the resistive-wall impedance of a resistive chamber, we must know the conductivity of a resistive material. The conductivity of the material at a given frequency can be evaluated by measuring the -matrix of a propagation mode in a waveguide. However, in most cases, only the absolute value of the -matrix is used for evaluation under the assumption that the conductivity is pure real, although both the -matrix and the conductivity are complex numbers in general. To evaluate complex conductivity from a measured complex -matrix, we derive new theoretical formulae of the -matrix for the TE and TM modes of a waveguide and for the quasi-TEM mode of a coaxial waveguide, where complex conductivity is assumed. In a reverse way, we can determine the conductivity of a material by using it as a fitting parameter in a comparison of a measured -matrix with those obtained using theoretical formulae. The three independent methods facilitate triple-checking of the accuracy of the measured conductivity.

Resistive-wall impedances of a thin non-evaporable getter coating on a conductive chamber

Shobuda, Yoshihiro; Chin, Y. H.*

Progress of Theoretical and Experimental Physics (Internet), 2017(12), p.123G01_1 - 123G01_22, 2017/12

https://doi.org/10.1093/ptep/ptx167

no abstracts in English

Beam-based compensation of extracted-beam displacement caused by field ringing of pulsed kicker magnets in the 3 GeV rapid cycling synchrotron of the Japan Proton Accelerator Research Complex

Harada, Hiroyuki; Saha, P. K.; Tamura, Fumihiko; Meigo, Shinichiro; Hotchi, Hideaki; Hayashi, Naoki; Kinsho, Michikazu; Hasegawa, Kazuo

Progress of Theoretical and Experimental Physics (Internet), 2017(9), p.093G01_1 - 093G01_16, 2017/09

AA2017-0286.pdf:4.64MB

https://doi.org/10.1093/ptep/ptx125

The 3 GeV rapid cycling synchrotron (RCS) of the J-PARC is a high intensity proton accelerator of 1 MW. The accelerated proton beams in the RCS are extracted by eight pulsed kicker magnets and are delivered to a materials and life science experimental facility and main ring synchrotron. However, the fields of the magnets experience ringing that displaces the position of the extracted beam. This is a major issue from the viewpoint of target integrity and large beam loss. The ringing was directly measured as the displacement of the extracted beams by using a shorter pulsed beam and scanning the entire trigger timing of the kickers. We managed to cancel out the ringing by optimizing trigger timing and achieved the beam extraction with high accuracy. We developed automatic correction system of the timing and now have a higher stability. In this paper, we report our procedure and experimental results for ringing compensation.