Probing Neutron Skins with KDAR Neutrinos: From Coherent to Diffractive Elastic Neutrino--Nucleus Scattering
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| Formato: | Preprint |
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2026
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| author | Heo, Kyoungsu Kwon, Heesung Kim, Jaewon Park, Jubin Cheoun, Myung-Ki Ha, Eunja Joo, Kyung Kwang |
| author_facet | Heo, Kyoungsu Kwon, Heesung Kim, Jaewon Park, Jubin Cheoun, Myung-Ki Ha, Eunja Joo, Kyung Kwang |
| contents | We investigate coherent elastic neutrino--nucleus scattering (CE$ν$NS) induced by pion--decay--at--rest ($π$DAR) and kaon--decay--at--rest (KDAR) neutrinos, with emphasis on the transition from strict coherence to the diffractive regime. Organizing CE$ν$NS observables in terms of the dimensionless variable $qR$, we show that $π$DAR measurements remain confined to the near--coherent region for all nuclei, whereas KDAR neutrinos ($E_ν=236$~MeV) extend the kinematics into $qR\gtrsim1$, where recoil spectra develop genuine shape sensitivity to the nuclear weak form factor. Using representative light, medium--mass, and heavy nuclei ($^{12}$C, $^{40}$Ca, $^{48}$Ca, and $^{208}$Pb), we examine relevant cross sections and quantify the statistical sensitivity to the neutron skin thickness achievable at a JSNS$^2$--like facility. For a total exposure of 10~ton$\cdot$year and realistic KDAR fluences, projected $1σ$ sensitivities reach $ΔR_{np}^{\,(1 σ)}$ $\simeq0.09$--$0.02$~fm for $^{48}$Ca and $\simeq0.07$--$0.02$~fm for $^{208}$Pb as the fluence increases. These sensitivities are competitive with, and complementary to, parity--violating electron--scattering measurements such as CREX and PREX, while relying on an electroweakly clean neutral--current probe with distinct systematic uncertainties.
Our results establish KDAR--based CE$ν$NS as a quantitatively robust and complementary avenue for probing neutron skins and nuclear weak densities beyond the coherent limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_20436 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Probing Neutron Skins with KDAR Neutrinos: From Coherent to Diffractive Elastic Neutrino--Nucleus Scattering Heo, Kyoungsu Kwon, Heesung Kim, Jaewon Park, Jubin Cheoun, Myung-Ki Ha, Eunja Joo, Kyung Kwang Nuclear Theory Nuclear Experiment We investigate coherent elastic neutrino--nucleus scattering (CE$ν$NS) induced by pion--decay--at--rest ($π$DAR) and kaon--decay--at--rest (KDAR) neutrinos, with emphasis on the transition from strict coherence to the diffractive regime. Organizing CE$ν$NS observables in terms of the dimensionless variable $qR$, we show that $π$DAR measurements remain confined to the near--coherent region for all nuclei, whereas KDAR neutrinos ($E_ν=236$~MeV) extend the kinematics into $qR\gtrsim1$, where recoil spectra develop genuine shape sensitivity to the nuclear weak form factor. Using representative light, medium--mass, and heavy nuclei ($^{12}$C, $^{40}$Ca, $^{48}$Ca, and $^{208}$Pb), we examine relevant cross sections and quantify the statistical sensitivity to the neutron skin thickness achievable at a JSNS$^2$--like facility. For a total exposure of 10~ton$\cdot$year and realistic KDAR fluences, projected $1σ$ sensitivities reach $ΔR_{np}^{\,(1 σ)}$ $\simeq0.09$--$0.02$~fm for $^{48}$Ca and $\simeq0.07$--$0.02$~fm for $^{208}$Pb as the fluence increases. These sensitivities are competitive with, and complementary to, parity--violating electron--scattering measurements such as CREX and PREX, while relying on an electroweakly clean neutral--current probe with distinct systematic uncertainties. Our results establish KDAR--based CE$ν$NS as a quantitatively robust and complementary avenue for probing neutron skins and nuclear weak densities beyond the coherent limit. |
| title | Probing Neutron Skins with KDAR Neutrinos: From Coherent to Diffractive Elastic Neutrino--Nucleus Scattering |
| topic | Nuclear Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2602.20436 |