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Title: Structure of Ne 20 states in resonance O 16 + α elastic scattering

Abstract

Background: The nuclear structure of the cluster bands in 20Ne presents a challenge for different theoretical approaches. It is especially difficult to explain the broad 0 +, 2 + states at 9 MeV excitation energy. Simultaneously, it is important to obtain more reliable experimental data for these levels in order to quantitatively assess the theoretical framework. Purpose: To obtain new data on 20Ne α- cluster structure. Method: Thick target inverse kinematics technique was used to study the 16O+α resonance elastic scattering and the data were analyzed using an R matrix approach. The 20Ne spectrum, the cluster and nucleon spectroscopic factors were calculated using cluster-nucleon configuration interaction model (CNCIM). Results: We determined the parameters of the broad resonances in 20Ne: 0 + level at 8.77 ± 0.150 MeV with a width of 750 $$^{+500}_{-220}$$ 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 showed that 9.19 MeV, 2 + level (if exists) should have width ≤ 10 keV. The detailed comparison of the theoretical CNCIM predictions with the experimental data on cluster states was made. Conclusions: Our experimental results by the TTIK method generally confirm the adopted data on α-cluster levels in 20Ne. The CNCIM gives a good description of the 20Ne 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, the qualitative disagreement with the experimentally observed structure is evident, especially for broad resonances.

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [2];  [2]
  1. Nazarbayev Univ., Astana (Kazakhstan); St. Petersburg State Univ., St. Petersburg (Russia)
  2. Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
  3. Nazarbayev Univ., Astana (Kazakhstan)
  4. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation); Dubna State Univ., Dubna (Russia)
  5. Florida State Univ., Tallahassee, FL (United States)
Publication Date:
Research Org.:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Ministry of Education and Science of the Republic of Kazakhstan; Welch Foundation
OSTI Identifier:
1594031
Alternate Identifier(s):
OSTI ID: 1373317
Grant/Contract Number:  
SC0009883; FG02-93ER40773; 011503029; 0115022465; A-1853
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Nauruzbayev, D. K., Goldberg, V. Z., Nurmukhanbetova, A. K., Golovkov, M. S., Volya, A., Rogachev, G. V., and Tribble, R. E. Structure of Ne20 states in resonance O16+α elastic scattering. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.014322.
Nauruzbayev, D. K., Goldberg, V. Z., Nurmukhanbetova, A. K., Golovkov, M. S., Volya, A., Rogachev, G. V., & Tribble, R. E. Structure of Ne20 states in resonance O16+α elastic scattering. United States. doi:10.1103/PhysRevC.96.014322.
Nauruzbayev, D. K., Goldberg, V. Z., Nurmukhanbetova, A. K., Golovkov, M. S., Volya, A., Rogachev, G. V., and Tribble, R. E. Fri . "Structure of Ne20 states in resonance O16+α elastic scattering". United States. doi:10.1103/PhysRevC.96.014322. https://www.osti.gov/servlets/purl/1594031.
@article{osti_1594031,
title = {Structure of Ne20 states in resonance O16+α elastic scattering},
author = {Nauruzbayev, D. K. and Goldberg, V. Z. and Nurmukhanbetova, A. K. and Golovkov, M. S. and Volya, A. and Rogachev, G. V. and Tribble, R. E.},
abstractNote = {Background: The nuclear structure of the cluster bands in 20Ne presents a challenge for different theoretical approaches. It is especially difficult to explain the broad 0+, 2+ states at 9 MeV excitation energy. Simultaneously, it is important to obtain more reliable experimental data for these levels in order to quantitatively assess the theoretical framework. Purpose: To obtain new data on 20Ne α- cluster structure. Method: Thick target inverse kinematics technique was used to study the 16O+α resonance elastic scattering and the data were analyzed using an R matrix approach. The 20Ne spectrum, the cluster and nucleon spectroscopic factors were calculated using cluster-nucleon configuration interaction model (CNCIM). Results: We determined the parameters of the broad resonances in 20Ne: 0+ level at 8.77 ± 0.150 MeV with a width of 750 $^{+500}_{-220}$ 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 showed that 9.19 MeV, 2+ level (if exists) should have width ≤ 10 keV. The detailed comparison of the theoretical CNCIM predictions with the experimental data on cluster states was made. Conclusions: Our experimental results by the TTIK method generally confirm the adopted data on α-cluster levels in 20Ne. The CNCIM gives a good description of the 20Ne 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, the qualitative disagreement with the experimentally observed structure is evident, especially for broad resonances.},
doi = {10.1103/PhysRevC.96.014322},
journal = {Physical Review C},
number = 1,
volume = 96,
place = {United States},
year = {2017},
month = {7}
}

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    Works referencing / citing this record:

    α-cluster structure above double closed shells
    journal, June 2019


    α-cluster structure above double closed shells
    journal, June 2019