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A: Fachverband Atomphysik
A 7: Collisions, Scattering and Correlation Phenomena II (joint session A/MO)
A 7.2: Vortrag
Montag, 2. März 2026, 17:15–17:30, N 2
Asymmetries observed in vibrational dissociation of HD by proton impact — •Michael Schulz1,2, Shruti Majumdar1, Sujan Bastola1, Basu Lamicchane1, Daniel Fischer1, Ahmad Hasan3, and Ramaz Lomsadze4 — 1Missouri University of Science & Technology, Rolla, USA — 2Max-Planck Institut für Kernphysik, Heidelberg, Germany — 3UAE University, Al Ain, UAE — 4Tbilisi State University, Tbilisi, Georgia
We have measured momentum-analyzed H+ and D+ molecular fragments produced in p + HD collisions in coincidence with neutralized scattering-angle resolved projectiles. From the data we extracted multiple (including fully) differential cross sections for dissociative capture. In various spectra we observed a pronounced asymmetry favoring the H+ + D0 over the H0 +D+ fragmentation channel. A qualitatively similar, but weaker asymmetry was previously found for dissociative ionization and well reproduced by theory [1]. It was explained by an isotope shift in the asymptotic molecular energy curves favoring the electron to be localized closer to the deuteron. We conclude that the same explanation holds for our results on dissociative capture. The larger magnitude of the asymmetry is probably due to the significantly smaller projectile energy.
[1] I. Ben-Itzhak et al., Phys. Rev. Lett. 85, 58 (2000)
Keywords: Dissociative capture; Asymmetries; Interfrence