Neutron skin studies in heavy nuclei with coherent p0 photo-production

Bondy, Ferretti

doi:10.22323/1.238.0008

Cited by 3 publications

(1 citation statement)

References 22 publications

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“…To further investigate the suitability of this technique to extract neutron-skin thicknesses a concerted experimental and theoretical effort is being undertaken. Using the same experimental setup as in [93], a follow-up measurement [99] has been performed at MAMI with the goal of extracting the neutron-skin thickness along an isotopic chain ( 116,120,124 Sn) in order to study both the emergence and isotopic evolution of the neutron skin with increasing neutronproton asymmetry. Moreover, such a study has the distinct advantage that by comparing the coherent yield of two isotopes any major systematic model uncertainty will largely cancel.…”

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confidence: 99%

Neutron skins of atomic nuclei: per aspera ad astra

Thiel¹,

Sfienti²,

Piekarewicz³

et al. 2019

J. Phys. G: Nucl. Part. Phys.

138

127

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The complex nature of the nuclear forces generates a broad range and diversity of observational phenomena. Heavy nuclei, though orders of magnitude less massive than neutron stars, are governed by the same underlying physics, which is enshrined in the nuclear equation of state. Heavy nuclei are expected to develop a neutron-rich skin where many neutrons collect near the surface. Such a skin thickness is strongly sensitive to the poorly-known density dependence of the symmetry energy near saturation density. An accurate and model-independent determination of the neutron-skin thickness of heavy nuclei would provide a significant first constraint on the density dependence of the nuclear symmetry energy.The determination of the neutron-skin thickness of heavy nuclei has far reaching consequences in many areas of physics as diverse as heavy-ion collisions, polarized electron and proton scattering off nuclei, precision tests of the standard model using atomic parity violation, and nuclear astrophysics.While a systematic and concerted experimental effort has been made to measure the neutron-skin thickness of heavy nuclei, a precise and model-independent determination remains elusive. The measurement of parity-violating asymmetries provides a clean and model-independent determination of the weak form factor of the nucleus which is dominated by the neutron distribution. However, measuring parity-violating asymmetries of the order of a part per million is both challenging and time-consuming. Alternative observables sensitive to the symmetry energy have been proposed and measured succesfully in recent experimental campaigns. These data are valuable, but interpretations contain implicit model dependence that hinder the clean determination of the neutron-skin thickness. How to move forward at a time when many new facilities are being commissioned and how to strengthen the synergy with other areas of physics are primary goals of this review.

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confidence: 99%

Neutron skins of atomic nuclei: per aspera ad astra

Thiel¹,

Sfienti²,

Piekarewicz³

et al. 2019

J. Phys. G: Nucl. Part. Phys.

138

127

View full text Add to dashboard Cite

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Electron scattering and neutrino physics

Ankowski,

Ashkenazi,

Bacca

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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A thorough understanding of neutrino–nucleus scattering physics is crucial for the successful execution of the entire US neutrino physics program. Neutrino–nucleus interaction constitutes one of the biggest systematic uncertainties in neutrino experiments—both at intermediate energies affecting long-baseline deep underground neutrino experiment, as well as at low energies affecting coherent scattering neutrino program—and could well be the difference between achieving or missing discovery level precision. To this end, electron–nucleus scattering experiments provide vital information to test, assess and validate different nuclear models and event generators intended to test, assess and validate different nuclear models and event generators intended to be used in neutrino experiments. Similarly, for the low-energy neutrino program revolving around the coherent elastic neutrino–nucleus scattering (CEvNS) physics at stopped pion sources, such as at ORNL, the main source of uncertainty in the evaluation of the CEvNS cross section is driven by the underlying nuclear structure, embedded in the weak form factor, of the target nucleus. To this end, parity-violating electron scattering (PVES) experiments, utilizing polarized electron beams, provide vital model-independent information in determining weak form factors. This information is vital in achieving a percent level precision needed to disentangle new physics signals from the standard model expected CEvNS rate. In this white paper, we highlight connections between electron- and neutrino–nucleus scattering physics at energies ranging from 10 s of MeV to a few GeV, review the status of ongoing and planned electron scattering experiments, identify gaps, and lay out a path forward that benefits the neutrino community. We also highlight the systemic challenges with respect to the divide between the nuclear and high-energy physics communities and funding that presents additional hurdles in mobilizing these connections to the benefit of neutrino programs.

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Nuclear coherent π0 photoproduction with charge-exchange and spin-flip rescattering

Tsaran,

Vanderhaeghen

2024

Phys. Rev. C

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Neutron skin studies in heavy nuclei with coherent p0 photo-production

Cited by 3 publications

References 22 publications

Neutron skins of atomic nuclei: per aspera ad astra

Neutron skins of atomic nuclei: per aspera ad astra

Electron scattering and neutrino physics

Nuclear coherent π0 photoproduction with charge-exchange and spin-flip rescattering

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