Measurement of high-energy resonances in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Ne</mi><mprescripts></mprescripts><none></none><mn>22</mn></mmultiscripts></math> through inverse kinematics

B. Greaves; D. Mücher; S. Gillespie; T. Drake; L. Atar; A. Babu; F. Barrett; N. Bernier; S. S. Bhattacharjee; V. Bildstein; R. Caballero-Folch; W. N. Catford; A. Chester; C. Aa. Diget; A. Garnsworthy; G. Hackman; E. Kasanda; A. M. Laird; B. Olaizola; N. A. Orr; T. Rockman; Y. Saito; P. Šiurytė; A. Spyrou; C. E. Svensson; R. Umashankar

doi:10.1103/h5h1-xrj2

Measurement of high-energy resonances in ${}^{22}{Ne}$ through inverse kinematics

B. Greaves ^1,2, D. Mücher ³, S. Gillespie ^4,5, T. Drake ⁶, L. Atar ¹, A. Babu ^4,7, F. Barrett ^4,8, N. Bernier ^4,9,10, S. S. Bhattacharjee⁴ et al.

V. Bildstein ¹, R. Caballero-Folch ⁴, W. N. Catford ¹¹, A. Chester ⁵, C. Aa. Diget^12,4, A. Garnsworthy ⁴, G. Hackman ^4,13, E. Kasanda ^1,14, A. M. Laird ^12,4, B. Olaizola ^4,15, N. A. Orr ¹⁶, T. Rockman¹, Y. Saito^4,9, P. Šiurytė ¹⁷, A. Spyrou ^5,18, C. E. Svensson ^1,4, and R. Umashankar ^4,9

¹Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
²INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro PD, Italy
³Universität zu Köln, 50923 Köln, Germany
⁴TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
⁵Facility for Rare Isotope Beams, East Lansing, Michigan 48824, USA
⁶Department of Physics, University of Toronto, Toronto, Ontario M5S 1A1, Canada
⁷Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
⁸Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada
⁹Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
¹⁰Grupo de Física Nuclear, EMFTEL & IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, E-28040 Madrid, Spain
¹¹University of Surrey, Stag Hill, Guildford GU2 7XH, United Kingdom
¹²University of York, Heslington, York YO10 5DD, United Kingdom
¹³Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
¹⁴University of Bern, Albert Einstein Centre for Fundamental Physics, Sidlerstrasse 5, 3012 Bern, Switzerland
¹⁵Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
¹⁶Université de Caen Normandie, CNRS/IN2P3, ENSICAEN, LPC-Caen UMR6534, 14050 Caen, France
¹⁷TU Delft, 2628 CD Delft, Netherlands
¹⁸Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA

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Phys. Rev. C 113, 065806 – Published 17 June, 2026

DOI: https://doi.org/10.1103/h5h1-xrj2

Abstract

The ${}^{22}{Ne} (α, n) {}^{25}{Mg}$ reaction acts as an $s$ -process neutron source in both the main and weak $s$ processes. By exciting ${}^{22}{Ne}$ to highly energetic resonance states above 9.7 MeV, we measured the properties of these difficult-to-access states, which are relevant to the stellar production of this seed isotope through the ${}^{18}O (α, γ) {}^{22}{Ne}$ reaction. At the ISAC II facility of TRIUMF, a 165 MeV beam of ${}^{21}{Ne}$ was delivered to a deuterated polyethylene $({CD}_{2})$ target, resulting in the population of an excited ${}^{22}{Ne}$ nucleus and a recoil proton. This reaction mechanism was studied with two surrounding complementary arrays: SHARC, a segmented silicon array for measurement of recoil particles, and TIGRESS, a high-purity, segmented germanium clover array for measurement and correction of Doppler-shifted $γ$ rays. Here, we present the first definitive spin-parity assignment and energy constraint of the 217 keV ${}^{18}O (α, γ) {}^{22}{Ne}$ resonance state, as well as the spin confirmation of the 575 keV and 662.1 keV resonances, and discuss the implications of these spin constraints on the production of the ${}^{22}{Ne}$ isotope in asymptotic giant branch stars.

Physical Review C

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Measurement of high-energy resonances in ${}^{22}{Ne}$ through inverse kinematics

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Measurement of high-energy resonances in Ne22 through inverse kinematics

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Measurement of high-energy resonances in ${}^{22}{Ne}$ through inverse kinematics