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Title: Searching for resonance states in Ne 22 ( p , γ ) Na 23

Journal Article · · Physical Review. C
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [5];  [6]; ORCiD logo [6]; ORCiD logo [7];  [8];  [6]; ORCiD logo [5]; ORCiD logo [9]; ORCiD logo [8];  [8];  [6];  [10];  [7]
  1. University of Texas at El Paso, TX (United States)
  2. TRIUMF, Vancouver, BC (Canada); University of York (United Kingdom); University of Surrey, Guildford (United Kingdom)
  3. Texas A&M University, College Station, TX (United States); iThemba Laboratory for Accelerator Based Sciences, Somerset West (South Africa); University of the Witwatersrand, Johannesburg (South Africa); Laboratori Nazionali del Sud–Istituto Nazionale di Fisica Nucleare, Cantania (Italy)
  4. Laboratori Nazionali del Sud–Istituto Nazionale di Fisica Nucleare, Catania (Italy); Dipartimento di Fisica e Astronomia “E.Majorana”, Catania (Italy); Centro Siciliano di Fisica Nucleare e Struttura della Materia (CSFNSM), Catania (Italy)
  5. CEA/DRF-CNRS/IN2P3, Caen (France)
  6. Université Paris-Saclay, Orsay (France)
  7. Ludwig-Maximilians-Universität München, Garching (Germany)
  8. Laboratori Nazionali del Sud–Istituto Nazionale di Fisica Nucleare, Catania (Italy)
  9. Università degli Studi di Perugia (Italy); Istituto Nazionale di Fisica Nucleare–Sezione di Perugia (Italy)
  10. Laboratori Nazionali del Sud–Istituto Nazionale di Fisica Nucleare, Catania (Italy); Cittadella Universitaria, Enna (Italy)
+ Show Author Affiliations

Globular clusters show strong correlations between different elements, such as the well-known sodium-oxygen anticorrelation. One of the main sources of uncertainty in this anticorrelation is the 22Ne(p,γ)23Na reaction rate, due to the possible influence of an unobserved resonance state at Ex = 8862 keV (Er,c.m.=68 keV). The influence of two higher-lying resonance states at Ex = 8894 and 9000 keV has already been ruled out by direct 22Ne(p,γ)23Na measurements. To study excited states in 23Na above the proton threshold to determine if the unconfirmed resonance states in 23Na exist. The non-selective proton inelastic scattering reaction at low energies was used to search for excited states in 23Na above the proton threshold. Protons scattered from various targets were momentum-analysed in the Q3D magnetic spectrograph at the Maier-Leibnitz Laboratorium, Munich, Germany. The resonance states previously reported at Ex = 8862, 8894 and 9000 keV in other experiments were not observed in the present experiment at any angle. This result, combined with other non-observations of these resonance states in most other experiments, results in a strong presumption against the existence of these resonance states. Here, the previously reported resonance states at Ex = 8862, 8894 and 9000 keV are unlikely to exist and should be omitted from future evaluations of the 22Ne(p,γ)23Na reaction rates. Indirect studies using low-energy proton inelastic scattering are a simple and yet exceptionally powerful tool in helping to constrain astrophysical reaction rates by providing non-selective information of the excited states of nuclei.

Research Organization:
Texas A&M University, College Station, TX (United States). Cyclotron Institute
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); Natural Sciences & Engineering Research Council of Canada
Grant/Contract Number:
FG02-93ER40773; SC0022469; SAPPJ2019-00039
OSTI ID:
2329278
Journal Information:
Physical Review. C, Vol. 108, Issue 4; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (31)

Excitation energies of levels in 23Na, 24Mg and 26Mg journal October 1976
Variations in the Na-O anticorrelation in globular clusters: evidence for a deep mixing episode in red giant branch stars: Variations in the Na-O anticorrelation journal April 2010
Fluorine and Sodium in C-Rich Low-Metallicity Stars, journal February 2011
On the self-enrichment scenario of galactic globular clusters: constraints on the IMF journal October 2006
The ion optical properties of the Munich Q3D-spectrograph investigated by means of a special experimental ray tracing method journal August 1973
Helium variation due to self–pollution among Globular Cluster stars: Consequences on the horizontal branch morphology journal October 2002
On Potassium and Other Abundance Anomalies of red Giants in ngc 2419 journal February 2016
Nuclear Structure of Na 23 : The Ne 22 ( He 3 , d ) Reaction journal December 1971
New measurements of low-energy resonances in the Ne 22 ( p , γ ) Na 23 reaction journal January 2017
Nucleosynthesis of Al 26 in massive stars: New Al 27 states above α and neutron emission thresholds journal June 2014
The Abundance Evolution of Oxygen, Sodium, and Magnesium in Extremely Metal Poor Intermediate-Mass Stars: Implications for the Self-Pollution Scenario in Globular Clusters journal May 2003
Three New Low-Energy Resonances in the Ne 22 ( p , γ ) Na 23 Reaction journal December 2015
Predictions for Self-Pollution in Globular Cluster Stars journal March 2001
Yields of AGB and SAGB models with chemistry of low- and high-metallicity globular clusters journal April 2013
γ -ray spectroscopy of the A = 23 , T = 1 / 2 nuclei 23 Na and 23 Mg: High-spin states, mirror symmetry, and applications to nuclear astrophysical reaction rates journal June 2013
Evolution, Nucleosynthesis, and Yields of Low-Mass Asymptotic Giant Branch Stars at Different Metallicities. ii. the Fruity Database journal November 2011
High-resolution study of levels in the astrophysically important nucleus Mg 26 and resulting updated level assignments journal April 2018
The Effects of Thermonuclear Reaction‐Rate Variations on Nova Nucleosynthesis: A Sensitivity Study journal September 2002
Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters journal January 2007
High- J states in Na 23 journal August 1984
Resonance strength in Ne 22 ( p , γ ) Na 23 from depth profiling in aluminum journal May 2010
New recommended ω γ for the E r c . m . = 458 keV resonance in Ne 22 ( p , γ ) Na 23 journal September 2015
22 Ne and 23 Na ejecta from intermediate-mass stars: the impact of the new LUNA rate for 22 Ne( p , γ) 23 Na journal November 2016
Massive binaries as the source of abundance anomalies in globular clusters journal October 2009
First inverse kinematics study of the Ne 22 ( p , γ ) Na 23 reaction and its role in AGB star and classical nova nucleosynthesis journal September 2020
Excitation energies of levels in 27Al and 28Si journal March 1976
Investigation of the 22Ne(p,γ)23Na reaction via (3He,d) spectroscopy journal December 2001
Nuclear Data Sheets for A=23 journal January 2021
Super and massive AGB stars – II. Nucleosynthesis and yields – Z = 0.02, 0.008 and 0.004 journal November 2013
First inverse kinematics measurement of key resonances in the 22Ne(p,γ)23Na reaction at stellar temperatures journal August 2020
Multiple Stellar Populations in Globular Clusters journal September 2018

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