Structure of Ne20 states in resonance O16+α elastic scattering

Structure of Ne20 states in resonance O16+α elastic scattering Background: The nuclear structure of the cluster bands in Ne20 presents a challenge for many theoretical approaches. It is especially difficult to explain the broad 0+ and 2+ states, both at around 9 MeV excitation energy. More reliable experimental data for these levels is important for proper quantitative assessment and development of theoretical methods.Purpose: To obtain new data on the Ne20 α-cluster structure.Method: The thick target inverse kinematics (TTIK) technique was used to study O16+α resonance elastic scattering and the data were analyzed using an R-matrix approach. The Ne20 spectrum and the cluster and nucleon spectroscopic factors were calculated using the cluster-nucleon configuration interaction model (CNCIM).Results: We determined the parameters of the broad resonances in Ne20: 0+ level at 8.77±0.150 MeV with a width of 750−220+500 keV; 2+ level at 8.75±0.100 MeV with the width of 695±120 keV; the width of 9.48 MeV level of 65±20 keV; and we showed that the 9.19 MeV, 2+ level (if it exists) should have a width of ≤10 keV. A detailed comparison of the theoretical CNCIM predictions with the experimental data on cluster states was made.Conclusions: Our experimental results obtained by the TTIK method generally confirm the adopted data on α-cluster levels in Ne20. The CNCIM gives a good description of the Ne20 positive-parity states up to an excitation energy of ∼7 MeV, predicting reasonably well the excitation energy of the states and their cluster and single-particle properties. At higher excitations, a qualitative disagreement with the experimentally observed structure is evident, especially for broad resonances. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Structure of Ne20 states in resonance O16+α elastic scattering

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Structure of Ne20 states in resonance O16+α elastic scattering

Abstract

Background: The nuclear structure of the cluster bands in Ne20 presents a challenge for many theoretical approaches. It is especially difficult to explain the broad 0+ and 2+ states, both at around 9 MeV excitation energy. More reliable experimental data for these levels is important for proper quantitative assessment and development of theoretical methods.Purpose: To obtain new data on the Ne20 α-cluster structure.Method: The thick target inverse kinematics (TTIK) technique was used to study O16+α resonance elastic scattering and the data were analyzed using an R-matrix approach. The Ne20 spectrum and the cluster and nucleon spectroscopic factors were calculated using the cluster-nucleon configuration interaction model (CNCIM).Results: We determined the parameters of the broad resonances in Ne20: 0+ level at 8.77±0.150 MeV with a width of 750−220+500 keV; 2+ level at 8.75±0.100 MeV with the width of 695±120 keV; the width of 9.48 MeV level of 65±20 keV; and we showed that the 9.19 MeV, 2+ level (if it exists) should have a width of ≤10 keV. A detailed comparison of the theoretical CNCIM predictions with the experimental data on cluster states was made.Conclusions: Our experimental results obtained by the TTIK method generally confirm the adopted data on α-cluster levels in Ne20. The CNCIM gives a good description of the Ne20 positive-parity states up to an excitation energy of ∼7 MeV, predicting reasonably well the excitation energy of the states and their cluster and single-particle properties. At higher excitations, a qualitative disagreement with the experimentally observed structure is evident, especially for broad resonances.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
0556-2813
eISSN
1089-490X
D.O.I.
10.1103/PhysRevC.96.014322
Publisher site
See Article on Publisher Site

Abstract

Background: The nuclear structure of the cluster bands in Ne20 presents a challenge for many theoretical approaches. It is especially difficult to explain the broad 0+ and 2+ states, both at around 9 MeV excitation energy. More reliable experimental data for these levels is important for proper quantitative assessment and development of theoretical methods.Purpose: To obtain new data on the Ne20 α-cluster structure.Method: The thick target inverse kinematics (TTIK) technique was used to study O16+α resonance elastic scattering and the data were analyzed using an R-matrix approach. The Ne20 spectrum and the cluster and nucleon spectroscopic factors were calculated using the cluster-nucleon configuration interaction model (CNCIM).Results: We determined the parameters of the broad resonances in Ne20: 0+ level at 8.77±0.150 MeV with a width of 750−220+500 keV; 2+ level at 8.75±0.100 MeV with the width of 695±120 keV; the width of 9.48 MeV level of 65±20 keV; and we showed that the 9.19 MeV, 2+ level (if it exists) should have a width of ≤10 keV. A detailed comparison of the theoretical CNCIM predictions with the experimental data on cluster states was made.Conclusions: Our experimental results obtained by the TTIK method generally confirm the adopted data on α-cluster levels in Ne20. The CNCIM gives a good description of the Ne20 positive-parity states up to an excitation energy of ∼7 MeV, predicting reasonably well the excitation energy of the states and their cluster and single-particle properties. At higher excitations, a qualitative disagreement with the experimentally observed structure is evident, especially for broad resonances.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jul 28, 2017

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