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Neutron knockout experiments reveal a strong shell closure at N=32 in Calcium-52 isotopes, similar to N=28 and N=34. This finding explains the increasing charge radius in neutron-rich Calcium isotopes.

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Area of Science:

  • Nuclear Physics
  • Atomic Physics
  • Quantum Chemistry

Background:

  • The structure of neutron-rich isotopes near the N=32 shell closure is crucial for understanding nuclear stability.
  • Calcium isotopes provide a key system for studying shell evolution due to their proximity to doubly magic nuclei.

Purpose of the Study:

  • To investigate the nuclear structure of ^{52}Ca by performing a one-neutron knockout reaction.
  • To measure the cross sections and momentum distributions of the removed neutrons.
  • To probe the N=32 shell closure and its impact on nuclear radii.

Main Methods:

  • One-neutron knockout experiment using ^{52}Ca at ~230 MeV/nucleon in inverse kinematics.
  • Scattering off a proton target.
  • Prompt gamma spectroscopy.
  • Analysis within the distorted-wave impulse approximation (DWIA) framework.

Main Results:

  • Exclusive quasifree scattering cross sections to bound states in ^{51}Ca were measured.
  • Momentum distributions for the removal of 1f_{7/2} and 2p_{3/2} neutrons were obtained.
  • Cross sections indicate a shell closure at N=32 comparable in strength to N=28 and N=34 in Calcium isotopes.
  • The difference in root-mean-square radii between 1f_{7/2} and 2p_{3/2} orbitals was determined to be 0.61(23) fm.

Conclusions:

  • The results support a strong N=32 shell closure in ^{52}Ca.
  • The large root-mean-square radius of the 2p_{3/2} orbital in neutron-rich Calcium isotopes is confirmed.
  • This orbital's size explains the linear increase in charge radius with neutron number in these isotopes.