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
7:00 PM–9:15 PM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Queens 4
Chair: Satoshi Nakamura
Abstract: E05.00002 : The magnetic spectrometer "S-2S" system for the missing-mass spectroscopy of Ξ hypernuclei.*
7:30 PM–7:45 PM
Presenter:
Kengo Ebata
(Kyoto Univ, JAEA)
Authors:
Kengo Ebata
(Kyoto Univ, JAEA)
Manami Fujita
(JAEA)
Toshiyuki Gogami
(Kyoto Univ)
Takeshi K Harada
(Kyoto Univ, JAEA)
Shuhei H Hayakawa
(Tohoku Univ)
Yudai Ichikawa
(JAEA)
Kento Kamada
(Tohoku Univ)
Takumi Kobori
(Tokyo Tech)
Tomofumi Nagae
(Kyoto Univ)
Kazuma Ohashi
(Tohoku Univ)
Fumiya Oura
(Tohoku Univ)
Shuji Takahashi
(Kyoto Univ)
Toshiyuki Takahashi
(KEK)
Mifuyu Ukai
(KEK, Tohoku Univ)
Daigo Watanabe
(Tohoku Univ)
Takeshi O Yamamoto
(JAEA)
Collaboration:
S-2S collaboration
At the K1.8 beamline in Hadron experimental facility of J-PARC, a missing-mass spectroscopic experiment for Ξ hypernuclei (J-PARC E70) started. In this experiment, high-purity and high intensity K− beams with 1.8 GeV/c are irradiated into a 12C target and produces Ξ hypernuclei, 12ΞBe via the (K–, K+) reaction. The missing-mass for 12ΞBe are given by momenta of scattered K+ which measured by the new magnetic spectrometer "S-2S" which expected to have great momentum resolution Δp/p = 6.0×10–4. The resolution of missing-mass is expected to be less than 2 MeV which is higher than past spectroscopy and can be evaluated for the peak structure of hypernuclei. We had been preparing for the experiment for many years, and the first commissioning run with hadron beams was carried out in June, 2023.
In this talk, we will report performance evaluation for the S-2S system on the first commissioning run. In addition, we will introduce momentum analysis for the S-2S by using machine learning.
*JSPS KAKENHI GrantNumbers,23000003,16H02186,18H05403,23H00114,20J2038
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