Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session E05: Minisymposium: Baryon-Baryon Interactions Involving Strangeness I |
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Chair: Satoshi Nakamura Room: Hilton Waikoloa Village Queens 4 |
Wednesday, November 29, 2023 7:00PM - 7:30PM |
E05.00001: Experimental knowledge of doubly-strange hypernuclei and prospects Invited Speaker: Kazuma Nakazawa We applied the Emulsion-Counter "Hybrid-method" linking real-time detectors and nuclear emulsion to search for doubly-strange hypernucleus in the KEK-E176 experiment. Then, the existence of double-Λ hypernucleus was confirmed with sequential weak decay at a Ξ- hyperon captured point. In the E373 (KEK) experiment, the uniquely identified event of 6ΛΛHe was successfully detected with upgraded hybrid method for the first time. In the more improved E07 (J-PARC) experiment, we detected 33 candidate events of doubly-strange hypernuclei. The 47 events from the above three experiments yielded the follwoing findings, such as 1) the interaction between two Λ hyperons was weakly attractive, 2) the binding energy of two Λ hyperons to a nucleus seems to have linear dependence on the nuclear mass number, 3) the Ξ hypernucleus existed, thus 4) the attractive interaction works between the Ξ- and nucleus. Besides, the level structure can be seen for the 15ΞC hypernucleus. Far from Hybrid-method, the development is on-going for "Overall-scanning method" as an effectively detecting method by searching for doubly-strange hypernuclei in the whole volume of the emulsion with applying a machine learning model. In the detection of hypertriton (3ΛH), the Overall-scanning method is working very well. This development must give us a large number of double-Λ hypernuclei produced at the K- reaction point as well as the Ξ- absorption. We also expect to detect many Ξ hypernuclei not only of 15ΞC but also 13ΞB and 17ΞN at Ξ- absorption point in the emulsion. Regarding 12ΞBe, the E70 experiment will be able to present level structure of Ξ- hyperon at J-PARC, soon. The E75 experiment at J-PARC is going to search for 7ΞH. By doping 10B in the emulsion gel, it will be possible to search for 11ΞBe hypernuclei. Such experimental approaches must provide important and reliable information to understand baryon-baryon interaction. |
Wednesday, November 29, 2023 7:30PM - 7:45PM |
E05.00002: The magnetic spectrometer "S-2S" system for the missing-mass spectroscopy of Ξ hypernuclei. Kengo Ebata, Manami Fujita, Toshiyuki Gogami, Takeshi K Harada, Shuhei H Hayakawa, Yudai Ichikawa, Kento Kamada, Takumi Kobori, Tomofumi Nagae, Kazuma Ohashi, Fumiya Oura, Shuji Takahashi, Toshiyuki Takahashi, Mifuyu Ukai, Daigo Watanabe, Takeshi O Yamamoto The experimental data for the strangeness S=−2 system are limited by compared to the S=−1 system such as ΛN and ΣN interactions. Recently, infomations for ΛΛ and ΞN interactions were observed by emulsion experiments and femtoscopy in heavy ion collision. However, to understand the ΞN interaction in detail, the spectroscopic data of Ξ hypernuclei which have higher statistics and higher precision are awaited. This will play impotant role to understand the extension of the baryon-baryon interaction including hyperon. |
Wednesday, November 29, 2023 7:45PM - 8:00PM |
E05.00003: High resolution spectroscopy of Ξ hypernuclei (J-PARC E70) Takeshi K Harada, Kengo Ebata, Manami Fujita, Toshiyuki Gogami, Shuhei H Hayakawa, Yudai Ichikawa, Kento Kamada, Takumi Kobori, Koji Miwa, Tomofumi Nagae, Fumiya Oura, Kazuma Ohashi, Shuji Takahashi, Toshiyuki Takahashi, Mifuyu Ukai, Takeshi O Yamamoto, Daigo Watanabe Understanding of the strong force has been extended from the nuclear interaction to the baryon-baryon interaction with strangeness degrees of freedom (S) by investigating hypernuclear energy structures. There is few spectroscopic information on S = −2 hypernuclei such as double-Λ and Ξ hypernuclei than those of Λ and Σ hypercuclei (S = −1). Recently, a few Ξ hypernuclear events have been reported from emulsion experiments. Also the data of femtoscopy from the ALICE Collaboration show that the ΞN and double-Λ interactions are attractive. To further study the ΞN interation, spectroscopic experiment of Ξ hypernuclei would play an indispensable role. |
Wednesday, November 29, 2023 8:00PM - 8:15PM |
E05.00004: The (σ·σ)-component of ΞN interaction and the 12C(K-,K+) Ξ12Be reaction spectrum Toshio Motoba, Yasuo Yamamoto, Atsushi Umeya Several pioneering experiments of (K-,K+) reaction have been performed so far for the study of Ξ-hypernuclear structure and ΞN interaction properties. However, their experimental energy resolutions are not good enough to extract distinct Ξ-binding energy and level structure of Ξ-hypernuclei. On the other hand, we have little knowledge of S=-2 BB interaction properties and in fact there are various theoretical ΞN interaction models that have very different spin-isospin properties from each other. |
Wednesday, November 29, 2023 8:15PM - 8:30PM |
E05.00005: Nuclear LS force from Lattice QCD Takuya Sugiura We present a lattice QCD determination of the LS force in the P-wave nucleon-nucleon system. The P-wave nuclear forces are determined by the time-dependent HAL QCD method. To access the P-wave nucleon-nucleon states, we utilize the free Laplacian heaviside (fLapH) smeared source operators, which allows for efficient calculations of the correlation functions. Flavor SU(3) gauge configurations with pion mass of 840 MeV and volume L3×T=(32a)4=(3.87 fm)4 are employed. |
Wednesday, November 29, 2023 8:30PM - 8:45PM |
E05.00006: Status of a carbon Ξ - atomic X-ray measurement at J-PARC (1) Kento Kamada, Ryo Imamoto, Fumiya Oura, Chesu Son, Hirokazu Tamura, Takeshi Yamamoto, Mifuyu Ukai, Takeshi K Harada, Kengo Ebata, Manami Fujita The interaction between the Ξ- baryon and the nucleon (Ξ-N interaction) has been discussed for a long time, but it has not been clarified experimentally very well. To study the Ξ-N interaction, we will carry out the experiment, J-PARC E96. J-PARC E96 experiment measures the energy of the X ray from orbital transitions of Ξ- in the carbon atom. We want to measure 55 keV X ray ((n, L) = (4, 3) → (3, 2) transition) and 154 keV X ray ((3, 2) → (2, 1) transition). In the case of (3, 2) → (2, 1) transition, the energy of X ray (154 keV) is expected to be slightly changed due to the Ξ-N interaction. In this experiment, the Ξ- baryon will be produced via the (K-, K+) reaction with the AFT (Active Fiber Target) at the J-PARC K1.8 beamline. Since AFT is composed of a lot of scintillating fibers, the particle tracking in the target can be performed. After tagging the Ξ- stop events in the target, Ge detectors surrounding the AFT measure X rays from Ξ atoms. In this presentation, I will talk about overview of the E96 experiment and data analysis of our Ge detector in the commissioning run carried out in June 2023. |
Wednesday, November 29, 2023 8:45PM - 9:00PM |
E05.00007: Status of a carbon Ξ- atomic X-ray measurement at J-PARC (2) Ryoh Imamoto, Hirokazu Tamura, Kento Kamada, Fumiya Oura, Takesi Yamamoto, Mihuyu Ukai, Manami Fujita In J-PARC E96 experiment, we will make precisely measure X rays from carbon atoms by using a Ge detector array, the modified Hyperball-X. We need a high-precision energy calibration method to measure the energy shift of X rays from the - carbon atoms in accuracy of 0.1 keV. We use LSO pulsers for the energy calibration. |
Wednesday, November 29, 2023 9:00PM - 9:15PM |
E05.00008: Kaon identification in Λ hypernuclear spectroscopy with S-2S at J-PARC (E94 Experiment) Daigo Watanabe, Patrick Achenbach, Jung Keun Ahn, Darko Androić, Arshak Asaturyan, Elena Botta, Masroor Bukhari, Alexandre Camsonne, Silviu Covrig, Kengo Ebata, Alessandro Feliciello, Hiroyuki Fujioka, Manami Fujita, Franco Garibaldi, Toshiyuki Gogami, Tomoyuki Hasegawa, Shuhei H Hayakawa, Takeshi K Harada, Ryotaro Honda, Yudai Ichikawa, Tatsuhiro Ishige, Kento Kamada, Shin Hyung Kim, Pete C Markowitz, Koji Miwa, Hamlet Mkrtchyan, Sho Nagao, Satoshi N Nakamura, Takuya Nanamura, Tomofumi Nagae, KAZUKI OKUYAMA, Fumiya Oura, Josef Pochodzalla, Albert Shahinyan, Simon Sirca, Chesu Son, Shuji Takahashi, Hirokazu Tamura, Kiyoshi Tanida, Mifuyu Ukai, Guido M Urciuoli, Takeshi O Yamamoto We are preparing for a high-precision spectroscopy experiment of Λ hypernuclei by (π+,K+) reaction using S-2S (Strangeness -2 Spectrometer) at J-PARC (J-PARC E94 experiment). The aim of this experiment is to measure Λ binding energies (BΛ) of 7ΛLi, 10ΛB, and 12ΛC with a resolution of 1 MeV (FWHM). With this high resolution, 7ΛLi can be used as a reference for BΛ, and the accuracy of BΛ including systematic errors is expected to be 100 keV. The measurement of the 10ΛB with such a high accuracy would allow us to compare with their mirror nuclei 10ΛBe measured in the (e,e'K+) reaction spectroscopy to study charge symmetry breaking in the Lambda-N interaction. |
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