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How Different is the Core of ^{25}F from ^{24}O_{g.s.} ?
T L Tang1,2, T Uesaka2, S Kawase1
1Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
Physical Review Letters
|June 13, 2020
Summary
Researchers studied the neutron-rich ^{25}F nucleus using a (p,2p) knockout reaction. The ^{24}O core structure significantly differs from a free ^{24}O nucleus, indicating changes possibly responsible for the oxygen dripline anomaly.
Area of Science:
- Nuclear Physics
- Atomic and Molecular Physics
Background:
- Investigating the structure of neutron-rich nuclei is crucial for understanding nuclear forces.
- The oxygen dripline anomaly presents a puzzle in nuclear astrophysics and structure.
Purpose of the Study:
- To investigate the nuclear structure of the neutron-rich ^{25}F nucleus.
- To understand the role of the ^{24}O core in ^{25}F and its relation to the oxygen dripline anomaly.
Main Methods:
- Utilized a quasifree proton-proton (p,2p) knockout reaction.
- Conducted the experiment in inverse kinematics at 270 MeV/nucleon.
Main Results:
- The sum of spectroscopic factors for the π0d_{5/2} orbital was determined to be 1.0±0.3.
- The ^{24}O core within ^{25}F is composed of approximately 35% ground state and 65% excited states.
- Spectroscopic factor for the ground state of ^{24}O was 0.36±0.13, and for excited states was 0.65±0.25.
Conclusions:
- The ^{24}O core in ^{25}F exhibits significant structural differences compared to a free ^{24}O nucleus.
- The addition of a 0d_{5/2} proton alters the neutron structure, potentially explaining the oxygen dripline anomaly.
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