Abstract.
The measurement of longitudinal momentum distribution for two-proton removal from the proton-drip line nucleus 17Ne with a Be target at 64 A MeV is reported. The observed narrow momentum distribution and the large interaction cross-section suggests the formation of a two-proton halo. The data analyzed within the Few-body Glauber model suggests a significant probability of the two valence protons to abnormally occupy the 2s1/2 orbit, indicating its lowering in proton-rich nuclei.
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Kanungo, R., Chiba, M., Abu-Ibrahim, B. et al. Observation of a two-proton halo in 17Ne. Eur. Phys. J. A 25 (Suppl 1), 327–330 (2005). https://doi.org/10.1140/epjad/i2005-06-184-y
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DOI: https://doi.org/10.1140/epjad/i2005-06-184-y