Charge identification of low-energy particles for double-strangeness nuclei in nuclear emulsion

Shinji Kinbara; Hiroyuki Ekawa; Tomomi Fujita; Shuhei Hayakawa; Sanghoon Hwang; Yuichi Ichikawa; Kei Imamura; Rina Murai; Myint Kyaw Soe; May Sweet; Aiko Takamine; Aye Moh Moh Theint; Hideki Ueno; Junya Yoshida; Masahiro Yoshimoto; Kazuma Nakazawa

doi:10.1093/ptep/pty137

Charge identification of low-energy particles for double-strangeness nuclei in nuclear emulsion

Shinji Kinbara, Hiroyuki Ekawa, Tomomi Fujita, Shuhei Hayakawa, Sanghoon Hwang, Yuichi Ichikawa, Kei Imamura, Rina Murai, Myint Kyaw Soe, May Sweet, Aiko Takamine, Aye Moh Moh Theint, Hideki Ueno, Junya Yoshida, Masahiro Yoshimoto, Kazuma Nakazawa

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3 Citations (Scopus)

Abstract

A development has been achieved in the identification method of the charges 1 to 5 of nuclides from the decay of double hypernuclei to be uniquely recognized by their nuclear species. The method is basically the measurement of track volume by the widths, depths, and angles of tracks of exposed nuclei of ¹H, ⁴He, ⁷Li, ⁹Be, and ¹¹B in nuclear emulsion at RIken Projectile-fragment Separator of RIKEN Radioactive Isotope Beam Factory. After their calibration by α particles, we obtained a quadric function to present a unified recognition of tracks with volume ratios of five nuclei to the α particles. The function in the emulsion has been applied to a candidate event of a Ξ hypernucleus for identification of the production and decay processes. We succeeded in recognizing a daughter nuclear fragment of a single-Λ hypernucleus as ⁶He with a likelihood ratio of 0.9; the process was then uniquely identified as Ξ⁻ + ¹⁴N → Λ⁹Be + Λ⁵He + n.

Original language	English
Article number	011H01
Journal	Progress of Theoretical and Experimental Physics
Volume	2019
Issue number	1
DOIs	https://doi.org/10.1093/ptep/pty137
Publication status	Published - Jan 1 2019
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1093/ptep/pty137

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Kinbara, S., Ekawa, H., Fujita, T., Hayakawa, S., Hwang, S., Ichikawa, Y., Imamura, K., Murai, R., Soe, M. K., Sweet, M., Takamine, A., Moh Theint, A. M., Ueno, H., Yoshida, J., Yoshimoto, M., & Nakazawa, K. (2019). Charge identification of low-energy particles for double-strangeness nuclei in nuclear emulsion. Progress of Theoretical and Experimental Physics, 2019(1), [011H01]. https://doi.org/10.1093/ptep/pty137

Kinbara, S, Ekawa, H, Fujita, T, Hayakawa, S, Hwang, S, Ichikawa, Y, Imamura, K, Murai, R, Soe, MK, Sweet, M, Takamine, A, Moh Theint, AM, Ueno, H, Yoshida, J, Yoshimoto, M & Nakazawa, K 2019, 'Charge identification of low-energy particles for double-strangeness nuclei in nuclear emulsion', Progress of Theoretical and Experimental Physics, vol. 2019, no. 1, 011H01. https://doi.org/10.1093/ptep/pty137

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title = "Charge identification of low-energy particles for double-strangeness nuclei in nuclear emulsion",

abstract = "A development has been achieved in the identification method of the charges 1 to 5 of nuclides from the decay of double hypernuclei to be uniquely recognized by their nuclear species. The method is basically the measurement of track volume by the widths, depths, and angles of tracks of exposed nuclei of 1H, 4He, 7Li, 9Be, and 11B in nuclear emulsion at RIken Projectile-fragment Separator of RIKEN Radioactive Isotope Beam Factory. After their calibration by α particles, we obtained a quadric function to present a unified recognition of tracks with volume ratios of five nuclei to the α particles. The function in the emulsion has been applied to a candidate event of a Ξ hypernucleus for identification of the production and decay processes. We succeeded in recognizing a daughter nuclear fragment of a single-Λ hypernucleus as 6He with a likelihood ratio of 0.9; the process was then uniquely identified as Ξ− + 14N → Λ9Be + Λ5He + n.",

author = "Shinji Kinbara and Hiroyuki Ekawa and Tomomi Fujita and Shuhei Hayakawa and Sanghoon Hwang and Yuichi Ichikawa and Kei Imamura and Rina Murai and Soe, {Myint Kyaw} and May Sweet and Aiko Takamine and {Moh Theint}, {Aye Moh} and Hideki Ueno and Junya Yoshida and Masahiro Yoshimoto and Kazuma Nakazawa",

note = "Funding Information: The experiment was performed under Program No. NP1406-RRC32 at RIBF, operated by RIKEN Nishina Center and CNS, The University of Tokyo. We thank the RIKEN Ring Cyclotron staff for their cooperation during the experiment. This work was partially supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers 14340069, 23224006, and 16H02180, Ministry of Education, Culture, Sports, Science and Technology (MEXT) KAKENHI Grant Numbers 08239103 (Priority Area), and 24105002 (Innovative Area 2404). Publisher Copyright: {\textcopyright} The Author(s) 2019. Published by Oxford University Press on behalf of the Physical Society of Japan.",

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doi = "10.1093/ptep/pty137",

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T1 - Charge identification of low-energy particles for double-strangeness nuclei in nuclear emulsion

AU - Kinbara, Shinji

AU - Ekawa, Hiroyuki

AU - Fujita, Tomomi

AU - Hayakawa, Shuhei

AU - Hwang, Sanghoon

AU - Ichikawa, Yuichi

AU - Imamura, Kei

AU - Murai, Rina

AU - Soe, Myint Kyaw

AU - Sweet, May

AU - Takamine, Aiko

AU - Moh Theint, Aye Moh

AU - Ueno, Hideki

AU - Yoshida, Junya

AU - Yoshimoto, Masahiro

AU - Nakazawa, Kazuma

N1 - Funding Information: The experiment was performed under Program No. NP1406-RRC32 at RIBF, operated by RIKEN Nishina Center and CNS, The University of Tokyo. We thank the RIKEN Ring Cyclotron staff for their cooperation during the experiment. This work was partially supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers 14340069, 23224006, and 16H02180, Ministry of Education, Culture, Sports, Science and Technology (MEXT) KAKENHI Grant Numbers 08239103 (Priority Area), and 24105002 (Innovative Area 2404). Publisher Copyright: © The Author(s) 2019. Published by Oxford University Press on behalf of the Physical Society of Japan.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - A development has been achieved in the identification method of the charges 1 to 5 of nuclides from the decay of double hypernuclei to be uniquely recognized by their nuclear species. The method is basically the measurement of track volume by the widths, depths, and angles of tracks of exposed nuclei of 1H, 4He, 7Li, 9Be, and 11B in nuclear emulsion at RIken Projectile-fragment Separator of RIKEN Radioactive Isotope Beam Factory. After their calibration by α particles, we obtained a quadric function to present a unified recognition of tracks with volume ratios of five nuclei to the α particles. The function in the emulsion has been applied to a candidate event of a Ξ hypernucleus for identification of the production and decay processes. We succeeded in recognizing a daughter nuclear fragment of a single-Λ hypernucleus as 6He with a likelihood ratio of 0.9; the process was then uniquely identified as Ξ− + 14N → Λ9Be + Λ5He + n.

AB - A development has been achieved in the identification method of the charges 1 to 5 of nuclides from the decay of double hypernuclei to be uniquely recognized by their nuclear species. The method is basically the measurement of track volume by the widths, depths, and angles of tracks of exposed nuclei of 1H, 4He, 7Li, 9Be, and 11B in nuclear emulsion at RIken Projectile-fragment Separator of RIKEN Radioactive Isotope Beam Factory. After their calibration by α particles, we obtained a quadric function to present a unified recognition of tracks with volume ratios of five nuclei to the α particles. The function in the emulsion has been applied to a candidate event of a Ξ hypernucleus for identification of the production and decay processes. We succeeded in recognizing a daughter nuclear fragment of a single-Λ hypernucleus as 6He with a likelihood ratio of 0.9; the process was then uniquely identified as Ξ− + 14N → Λ9Be + Λ5He + n.

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ER -

Charge identification of low-energy particles for double-strangeness nuclei in nuclear emulsion

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