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Magicity versus Superfluidity around ^{28}O viewed from the Study of ^{30}F.
Phys Rev Lett
August 2024
RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.
The neutron-rich unbound fluorine isotope ^{30}F_{21} has been observed for the first time by measuring its neutron decay at the SAMURAI spectrometer (RIBF, RIKEN) in the quasifree proton knockout reaction of ^{31}Ne nuclei at 235 MeV/nucleon. The mass and thus one-neutron-separation energy of ^{30}F has been determined to be S_{n}=-472±58(stat)±33(sys) keV from the measurement of its invariant-mass spectrum. The absence of a sharp drop in S_{n}(^{30}F) shows that the "magic" N=20 shell gap is not restored close to ^{28}O, which is in agreement with our shell-model calculations that predict a near degeneracy between the neutron d and fp orbitals, with the 1p_{3/2} and 1p_{1/2} orbitals becoming more bound than the 0f_{7/2} one.
View Article and Find Full Text PDFNew Perspectives on Spectroscopic Factor Quenching from Reactions.
Phys Rev Lett
November 2023
Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
The evolution of single-particle strengths as the neutron-to-proton asymmetry changes informs us of the importance of short- and long-range correlations in nuclei and has therefore been extensively studied for the last two decades. Surprisingly, the strong asymmetry dependence of these strengths and their extreme values for highly asymmetric nuclei inferred from knockout reaction measurements on a target nucleus are not consistent with what is extracted from electron-induced, transfer, and quasi-free reaction data, constituting a two-decade old puzzle. This work presents the first consistent analysis of one-nucleon transfer and one-nucleon knockout data, in which theoretical uncertainties associated with the nucleon-nucleus effective interactions considered in the reaction models are quantified using a Bayesian analysis.
View Article and Find Full Text PDFMeasurement of polarization observables , , and in and photoproduction off quasi-free nucleons.
Eur Phys J A Hadron Nucl
October 2023
Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
The target asymmetry , recoil asymmetry , and beam-target double polarization observable were determined in exclusive and photoproduction off quasi-free protons and, for the first time, off quasi-free neutrons. The experiment was performed at the electron stretcher accelerator ELSA in Bonn, Germany, with the Crystal Barrel/TAPS detector setup, using a linearly polarized photon beam and a transversely polarized deuterated butanol target. Effects from the Fermi motion of the nucleons within deuterium were removed by a full kinematic reconstruction of the final state invariant mass.
View Article and Find Full Text PDFMultiple Mechanisms in Proton-Induced Nucleon Removal at ∼100 MeV/Nucleon.
Phys Rev Lett
April 2023
RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
We report on the first proton-induced single proton- and neutron-removal reactions from the neutron-deficient ^{14}O nucleus with large Fermi-surface asymmetry S_{n}-S_{p}=18.6 MeV at ∼100 MeV/nucleon, a widely used energy regime for rare-isotope studies. The measured inclusive cross sections and parallel momentum distributions of the ^{13}N and ^{13}O residues are compared to the state-of-the-art reaction models, with nuclear structure inputs from many-body shell-model calculations.
View Article and Find Full Text PDFExtended p_{3/2} Neutron Orbital and the N=32 Shell Closure in ^{52}Ca.
Phys Rev Lett
December 2022
Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.
The one-neutron knockout from ^{52}Ca in inverse kinematics onto a proton target was performed at ∼230 MeV/nucleon combined with prompt γ spectroscopy. Exclusive quasifree scattering cross sections to bound states in ^{51}Ca and the momentum distributions corresponding to the removal of 1f_{7/2} and 2p_{3/2} neutrons were measured. The cross sections, interpreted within the distorted-wave impulse approximation reaction framework, are consistent with a shell closure at the neutron number N=32, found as strong as at N=28 and N=34 in Ca isotopes from the same observables.
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