First measurement of the low-energy direct capture in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mmultiscripts><mi>Ne</mi><mprescripts></mprescripts><none></none><mn>20</mn></mmultiscripts><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo><mmultiscripts><mi>Na</mi><mprescripts></mprescripts><none></none><mn>21</mn></mmultiscripts></mrow></math> and improved energy and strength of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>E</mi><mtext>c.m.</mtext></msub><mo>=</mo><mn>368</mn><mspace width="0.16em"></mspace><mi>keV</mi></mrow></math> resonance

LUNA collaboration; E. Masha; L. Barbieri; J. Skowronski; M. Aliotta; C. Ananna; F. Barile; D. Bemmerer; A. Best; A. Boeltzig; C. Broggini; C. G. Bruno; A. Caciolli; M. Campostrini; F. Casaburo; F. Cavanna; G. F. Ciani; A. Ciapponi; P. Colombetti; A. Compagnucci; P. Corvisiero; L. Csedreki; T. Davinson; R. Depalo; A. Di Leva; Z. Elekes; F. Ferraro; E. M. Fiore; A. Formicola; Zs. Fülöp; G. Gervino; A. Guglielmetti; C. Gustavino; Gy. Gyürky; G. Imbriani; J. José; M. Junker; M. Lugaro; P. Manoj; P. Marigo; R. Menegazzo; V. Paticchio; D. Piatti; P. Prati; D. Rapagnani; V. Rigato; D. Robb; L. Schiavulli; R. S. Sidhu; O. Straniero; T. Szücs; S. Zavatarelli

doi:10.1103/PhysRevC.108.L052801

Letter

First measurement of the low-energy direct capture in ${}^{20}{Ne} (p, γ) {}^{21}{Na}$ and improved energy and strength of the $E_{c.m.} = 368 keV$ resonance

E. Masha ^1,2,3, L. Barbieri ^4,5, J. Skowronski ^4,5, M. Aliotta⁶, C. Ananna ^7,8, F. Barile^9,10, D. Bemmerer ¹, A. Best ^7,8, A. Boeltzig ¹ et al. (LUNA collaboration)

A. Boeltzig ¹, C. Broggini ⁵, C. G. Bruno ⁶, A. Caciolli ^4,5,*, M. Campostrini ¹¹, F. Casaburo ^12,13, F. Cavanna ¹⁴, G. F. Ciani ^9,10, A. Ciapponi^2,3, P. Colombetti ^15,14, A. Compagnucci ^16,17, P. Corvisiero^12,13, L. Csedreki ¹⁸, T. Davinson ⁶, R. Depalo ^2,3, A. Di Leva ^7,8, Z. Elekes ¹⁸, F. Ferraro^2,3, E. M. Fiore ^9,10, A. Formicola¹⁹, Zs. Fülöp ¹⁸, G. Gervino^15,14, A. Guglielmetti ^2,3, C. Gustavino ¹⁹, Gy. Gyürky ¹⁸, G. Imbriani ^7,8, J. José ^20,21, M. Junker ¹⁷, M. Lugaro ^22,23, P. Manoj ¹⁴, P. Marigo^4,5, R. Menegazzo ⁵, V. Paticchio ¹⁰, D. Piatti ^4,5, P. Prati ^12,13, D. Rapagnani ^7,8, V. Rigato ¹¹, D. Robb ⁶, L. Schiavulli^9,10, R. S. Sidhu ⁶, O. Straniero ^24,19, T. Szücs ¹⁸, and S. Zavatarelli ^12,13,† (LUNA collaboration)

¹Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
²Università degli Studi di Milano, 20133 Milano, Italy
³INFN, Sezione di Milano, 20133 Milano, Italy
⁴Università degli Studi di Padova, 35131 Padova, Italy
⁵INFN, Sezione di Padova, 35131 Padova, Italy
⁶SUPA, School of Physics and Astronomy, University of Edinburgh, EH9 3FD Edinburgh, United Kingdom
⁷Università degli Studi di Napoli “Federico II,” 80126 Napoli, Italy
⁸INFN, Sezione di Napoli, 80126 Napoli, Italy
⁹Università degli Studi di Bari, 70125 Bari, Italy
¹⁰INFN, Sezione di Bari, 70125 Bari, Italy
¹¹Laboratori Nazionali di Legnaro, 35020, Legnaro (PD), Italy
¹²Università degli Studi di Genova, 16146 Genova, Italy
¹³INFN, Sezione di Genova, 16146 Genova, Italy
¹⁴INFN, Sezione di Torino, 10125 Torino, Italy
¹⁵Università degli Studi di Torino, 10125 Torino, Italy
¹⁶Gran Sasso Science Institute, 67100 L'Aquila, Italy
¹⁷INFN, Laboratori Nazionali del Gran Sasso (LNGS), 67100 Assergi, Italy
¹⁸Institute for Nuclear Research (ATOMKI), P. O. Box 51, 4001 Debrecen, Hungary
¹⁹INFN, Sezione di Roma, 00185 Roma, Italy
²⁰Universitat Politècnica de Catalunya, 08019 Barcelona, Spain
²¹Institut d'Estudis Espacials de Catalunya, 08034 Barcelona, Spain
²²Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, HUN-REN, 1121 Budapest, Hungary
²³ELTE Eötvös Loránd University, Institute of Physics, 1117 Budapest, Hungary
²⁴INAF Osservatorio Astronomico d'Abruzzo, 64100 Teramo, Italy

^*antonio.caciolli@unipd.it
^†sandra.zavatarelli@ge.infn.it

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Phys. Rev. C 108, L052801 – Published 22 November, 2023

DOI: https://doi.org/10.1103/PhysRevC.108.L052801

Abstract

The ${}^{20}{Ne} {(p, γ)}^{21} Na$ reaction is the slowest in the NeNa cycle and directly affects the abundances of the Ne and Na isotopes in a variety of astrophysical sites. Here we report the measurement of its direct capture contribution, for the first time below $E_{c . m .} = 352$ keV, and of the contribution from the $E_{c . m .} = 368$ keV resonance, which dominates the reaction rate at $T = 0.03$ –1.00 GK. The experiment was performed deep underground at the Laboratory for Underground Nuclear Astrophysics, using a high-intensity proton beam and a windowless neon gas target. Prompt $γ$ rays from the reaction were detected with two high-purity germanium detectors. We obtain a resonance strength $ω γ = (0.112 \pm 0 . 002_{stat} \pm 0 . 005_{sys}) meV$ , with an uncertainty a factor of 3 smaller than previous values. Our revised reaction rate is 20% lower than previously adopted at $T < 0.1$ GK and agrees with previous estimates at temperatures $T \geq 0.1$ GK. Initial astrophysical implications are presented.

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First measurement of the low-energy direct capture in ${}^{20}{Ne} (p, γ) {}^{21}{Na}$ and improved energy and strength of the $E_{c.m.} = 368 keV$ resonance

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First measurement of the low-energy direct capture in Ne20(p,γ)Na21 and improved energy and strength of the Ec.m.=368keV resonance

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First measurement of the low-energy direct capture in ${}^{20}{Ne} (p, γ) {}^{21}{Na}$ and improved energy and strength of the $E_{c.m.} = 368 keV$ resonance