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<p>Mono-energetic neutrinos from kaon decay at rest (KDAR) provide a unique opportunity to investigate nuclear weak transition strengths under fixed kinematic conditions. In this work, we study charged-current KDAR neutrino-induced reactions on <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(^{12}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>12</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>C at an incident energy of <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(E_\nu \simeq 236\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>E</mi> <mi>ν</mi> </msub> <mo>≃</mo> <mn>236</mn> </mrow> </math></EquationSource> </InlineEquation>&#xa0;MeV, focusing on a multipole-resolved analysis of nuclear transition strengths. The transition strengths are decomposed according to spin and parity, and separated into longitudinal and transverse components as well as vector and axial-vector contributions. In particular, the multipole dependence reveals a clear transition from collective to single-nucleon dynamics with increasing excitation energy. The present results demonstrate that KDAR neutrino-induced reactions provide direct access to multipole-dependent nuclear transition strengths that are otherwise difficult to isolate in flux-averaged measurements.</p>

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Multipole-Resolved Nuclear Transition Strengths of \(^{12}\)C Induced by Mono-Energetic KDAR Neutrinos

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Chaeyun Lee,
  • Kyungsik Kim,
  • Eunja Ha,
  • Myung-Ki Cheoun

摘要

Mono-energetic neutrinos from kaon decay at rest (KDAR) provide a unique opportunity to investigate nuclear weak transition strengths under fixed kinematic conditions. In this work, we study charged-current KDAR neutrino-induced reactions on \(^{12}\) 12 C at an incident energy of \(E_\nu \simeq 236\) E ν ≃ 236  MeV, focusing on a multipole-resolved analysis of nuclear transition strengths. The transition strengths are decomposed according to spin and parity, and separated into longitudinal and transverse components as well as vector and axial-vector contributions. In particular, the multipole dependence reveals a clear transition from collective to single-nucleon dynamics with increasing excitation energy. The present results demonstrate that KDAR neutrino-induced reactions provide direct access to multipole-dependent nuclear transition strengths that are otherwise difficult to isolate in flux-averaged measurements.