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Titration Calculations: Strong Acid - Strong Base02:28

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A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
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Researchers studied neutron pair emission from neutron-rich isotones Carbon-18 and Oxygen-20. The findings reveal direct pair emission dominates Carbon-18 decay, suggesting a core of Carbon-14 with four correlated valence neutrons.

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Area of Science:

  • Nuclear Physics
  • Exotic Nuclei Research
  • Quantum Correlations

Background:

  • Investigating neutron-rich isotopes is crucial for understanding nuclear structure and the limits of nuclear stability.
  • Neutron pair emission is a key decay mode that provides insights into nuclear correlations.
  • The N=12 isotones, such as Carbon-18 and Oxygen-20, represent interesting systems for studying the effects of excess neutrons.

Purpose of the Study:

  • To investigate the mechanism of neutron pair emission from neutron-rich N=12 isotones, specifically Carbon-18 and Oxygen-20.
  • To analyze the correlations between emitted neutrons to understand the underlying nuclear structure.
  • To explore the role of valence neutrons and nuclear core structure in two-neutron emission.

Main Methods:

  • Utilized high-energy nucleon knockout reactions from secondary beams of Nitrogen-19 and Oxygen-21.
  • Populated unbound states of Carbon-18 and Oxygen-20 up to 15 MeV above their two-neutron emission thresholds.
  • Analyzed triple fragment-neutron-neutron correlations to determine decay mechanisms.

Main Results:

  • The decay of Carbon-18 (from Nitrogen-19 knockout) is dominated by direct neutron pair emission, with the largest observed two-neutron correlation strength.
  • This strong correlation suggests a $^{14}$C core with four valence neutrons arranged in strongly correlated pairs.
  • The decay of Oxygen-20 (from Oxygen-21 knockout) shows significant competition between direct emission and sequential decay, attributed to the knockout of a deeply bound neutron.

Conclusions:

  • Direct neutron pair emission is a dominant process in neutron-rich systems like Carbon-18.
  • The observed correlations provide evidence for cluster-like structures and strong pairing correlations in the outermost valence neutrons.
  • The difference in decay mechanisms between Carbon-18 and Oxygen-20 highlights the influence of the nuclear core and the nature of the knocked-out nucleon on the decay pathway.