Experimental study of the Si30(He3,d)P31 reaction and thermonuclear reaction rate of Si30(p,γ)P31

Harrouz, D. S.; de Séréville, Nicolas; Adsley, P.; Hammache, F.; Longland, R.; Bastin, B.; Faestermann, T.; Hertenberger, R.; La Cognata, M.; Lamia, L.; Meyer, A.; Palmerini, S.; Pizzone, R. G.; Romano, S.; Tumino, A.; Wirth, H. -F.

doi:10.1103/physrevc.105.015805

Title: Experimental study of the Si 30 ( He 3 , d ) P 31 reaction and thermonuclear reaction rate of Si 30 ( p , γ ) P 31

Journal Article · 13 January 2022 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.105.015805 · OSTI ID:1907617

^[1]; de Séréville, Nicolas ^[2];

^[3]; Hammache, F. ^[2];

^[4]; Bastin, B. ^[5];

^[6];

^[7];

^[8]; Lamia, L. ^[9]; Meyer, A. ^[2];

^[10];

^[8]; Romano, S. ^[11]; Tumino, A. ^[12]; Wirth, H. -F. ^[7]

Univ. Paris-Saclay, Orsay (France); UNC Chapel Hill
Univ. Paris-Saclay, Orsay (France)
Univ. of the Witwatersrand, Johannesburg (South Africa); iThemba Lab. for Accelerator Based Sciences, Somerset West (South Africa); Texas A & M Univ., College Station, TX (United States)
North Carolina State Univ., Raleigh, NC (United States); Triangle Universities Nuclear Lab., Durham, NC (United States)
Grand Accélérateur National d'Ions Lourds (GANIL), Caen (France)
Technische Univ. München, Garching (Germany)
Ludwig-Maximilians-Univ. München, Garching (Germany)
Laboratori Nazionali del Sud–Istituto Nazionale di Fisica Nucleare, Catania (Italy)
Laboratori Nazionali del Sud–Istituto Nazionale di Fisica Nucleare, Catania (Italy); Univ. di Catania (Italy)
Univ. degli Studi di Perugia (Italy); Istituto Nazionale di Fisica Nucleare, Perugia (Italy)
Laboratori Nazionali del Sud–Istituto Nazionale di Fisica Nucleare, Catania (Italy); Univ. di Catania (Italy); Univ. degli Studi di Enna (Italy)
Laboratori Nazionali del Sud–Istituto Nazionale di Fisica Nucleare, Catania (Italy); Univ. degli Studi di Enna (Italy)

Background: Abundance anomalies in some globular clusters, such as the enhancement of potassium and the depletion of magnesium, can be explained in terms of an earlier generation of stars polluting the presently observed ones. It was shown that the potential range of temperatures and densities of the polluting sites depends on the strength of a few critical reaction rates. The ³⁰Si(p,γ)³¹P reaction has been identified as one of these important reactions. Purpose: The key ingredient for evaluating the thermonuclear ³⁰Si(p,γ)³¹P reaction rate is the strength of the resonances which, at low energy, are proportional to their proton width. Therefore, the goal of this work is to determine the proton widths of unbound ³¹P states. Method: States in ³¹P were studied at the Maier-Leibnitz-Laboratorium using the one-proton ³⁰Si(³He,d)³¹P transfer reaction. Deuterons were detected with the high resolution one quadrupole three dipoles (Q3D) magnetic spectrometer. Angular distribution and spectroscopic factors were extracted for 27 states, and proton widths and resonance strengths were calculated for the unbound states. Results: Several ³¹P unbound states have been observed for the first time in a one-proton transfer reaction. Above 20 MK, the ³⁰Si(p,γ)³¹P reaction rate is now entirely estimated from the observed properties of ³¹P states. The reaction rate uncertainty from all resonances other than the E$$^{c.m.}_{r}$$ = 149 keV resonance has been reduced down to less than a factor of 2 above that temperature. The unknown spin and parity of the E$$^{c.m.}_{r}$$ = 149 keV resonance dominates the uncertainty in the rate in the relevant temperature range. Conclusion: Here, the remaining source of uncertainty on the ³⁰Si(p,γ)³¹P reaction rate comes from the unknown spin and parity of the E$$^{c.m.}_{r}$$ = 149 keV resonance which can change the reaction rate by a factor of 10 in the temperature range of interest.

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Research Organization:: Duke Univ., Durham, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-97ER41033

OSTI ID:: 1907617

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 105; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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