{
  "abstract": "We have realized a highly polarized epithermal neutron beam using an in-situ polarized 3He spin filter at the high-intensity pulsed neutron facility J-PARC. A neutron polarization exceeding 80% was achieved for epithermal neutrons with energies below 1 eV, including a polarization of 86.4 $\\pm$ 0.5% for 0.75 eV neutrons, which corresponds to the resonance energy of the p-wave compound state in the 139La+n system. The spin filter consisted of a 20-cm-long, 3.2-atm 3He gas cell polarized on the beamline using a compact laser-optics system for spin-exchange optical pumping (SEOP). A 3He polarization of approximately 78% was stably maintained on the beamline for more than 100 hours. The polarized epithermal neutron beam developed in this work provides a powerful tool for studies of discrete symmetry violations, including measurements of enhanced parity violation in neutron absorption by medium-heavy nuclei such as 139La and searches for time-reversal symmetry violation in neutron-nucleus systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.00106",
  "author_total": 22,
  "authors": [
    {
      "name": "K. Asai"
    },
    {
      "name": "S. Endo"
    },
    {
      "name": "S. Hayashi"
    },
    {
      "name": "H. Isozaki"
    },
    {
      "name": "T. Ino"
    },
    {
      "name": "W. Kambara"
    },
    {
      "name": "S. Kawamura"
    },
    {
      "name": "A. Kimura"
    },
    {
      "name": "M. Kitaguchi"
    },
    {
      "name": "S. Kudo"
    },
    {
      "name": "R. Kobayashi"
    },
    {
      "name": "T. Oku"
    },
    {
      "name": "T. Okudaira"
    },
    {
      "name": "M. Okuizumi"
    },
    {
      "name": "H. M. Shimizu"
    },
    {
      "name": "K. Shimodaira"
    },
    {
      "name": "Y. Suto"
    },
    {
      "name": "S. Takada"
    },
    {
      "name": "S. Takahashi"
    },
    {
      "name": "H. Tanaka"
    },
    {
      "name": "Y. Tsuchikawa"
    },
    {
      "name": "T. Yamaguchi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/avad8trnmfahs.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.00106",
  "fulltext_url": null,
  "id": "avad8trnmfahs",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.00106",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "arxiv",
      "physics.ins-det"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.00106",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/avad8trnmfahs.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.00106",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.00106"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Highly polarized epithermal neutron beam using polarized 3He gas at J-PARC",
  "title_text": "Highly polarized epithermal neutron beam using polarized 3He gas at J-PARC",
  "type": "preprint",
  "updated_at": "2026-11-03T12:20:59Z",
  "url": "https://research.draconitic.com/paper/avad8trnmfahs",
  "venue": "arXiv",
  "versions": []
}