First simultaneous measurement of the γ-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring

The probabilities for γ-ray and particle emission as a function of the excitation energy of a decaying nucleus are valuable observables for constraining the ingredients of the models that describe the deexcitation of nuclei near the particle emission threshold. These models are essential in nuclear astrophysics and applications. In this paper, we have for the first time simultaneously measured the γ-ray and neutron emission probabilities of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Pb</a:mi><a:mprescripts/><a:none/><a:mn>208</a:mn></a:mmultiscripts></a:math>. The measurement was performed in inverse kinematics at the Experimental Storage Ring (ESR) of the GSI/FAIR facility, where a <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mmultiscripts><b:mi>Pb</b:mi><b:mprescripts/><b:none/><b:mn>208</b:mn></b:mmultiscripts></b:math> beam interacted through the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:mmultiscripts><c:mi>Pb</c:mi><c:mprescripts/><c:none/><c:mn>208</c:mn></c:mmultiscripts><c:mo>(</c:mo><c:mi>p</c:mi><c:mo>,</c:mo><c:msup><c:mrow><c:mi>p</c:mi></c:mrow><c:mo>′</c:mo></c:msup><c:mo>)</c:mo></c:mrow></c:math> reaction with a hydrogen gas jet target. Instead of detecting the γ rays and neutrons emitted by <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mmultiscripts><d:mi>Pb</d:mi><d:mprescripts/><d:none/><d:mn>208</d:mn></d:mmultiscripts></d:math>, we detected the heavy beamlike residues produced after γ and neutron emission. These heavy residues were fully separated by a dipole magnet of the ESR and were detected with outstanding efficiencies. The comparison of the measured probabilities with model calculations has allowed us to test and select different descriptions of the γ-ray strength function and the nuclear level density available in the literature.

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Publication Details

Journal
Physical review. C
Published
2025-02-18
DOI
https://doi.org/10.1103/physrevc.111.024614
Citations
2
Primary Topic
Nuclear Physics and Applications
Type
article
Field-Weighted Citation Impact
3.77

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article

First simultaneous measurement of the γ-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring

B. Włoch, S. Dellmann, R. S. Sidhu, M. Roche et al.
2 citations
Physical review. C
Nuclear Physics and Applications
3.77
article

First simultaneous measurement of the γ-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring

B. Włoch, S. Dellmann, R. S. Sidhu, M. Roche, P. Ascher, N. Petridis, V. Méot, R. Heß, J. Pibernat, O. Forstner, B. Thomas, Yu. A. Litvinov, R. Reifarth, B. Brückner, S. Heil, U. Spillmann, A. Gumberidze, Β. Blank, B. Jurado, M. S. Sanjari, I. Dillmann, M. Versteegen, M. Gerbaux, C. J. Griffin, J. Adamczewski-Musch, L. Audouin, Th. Stöhlker, S. Grévy, G. Leckenby, D. Freire-Fernández, L. Thulliez, J. Michaud, M. Sguazzin, C. Domingo‐Pardo, J. Glorius, S. Litvinov, Marc Dupuis, P. Alfaurt, J. Giovinazzo, C. Berthelot, S. Pérard, K. Blaum, D. Ramos, N. Kurz, M. Grieser, A. Heinz, P. Erbacher, M. Flayol, M. Steck, D. Kurtulgil, J. A. Swartz, U. Popp, B. Lorentz
article en
2 citations

Abstract

The probabilities for γ-ray and particle emission as a function of the excitation energy of a decaying nucleus are valuable observables for constraining the ingredients of the models that describe the deexcitation of nuclei near the particle emission threshold. These models are essential in nuclear astrophysics and applications. In this paper, we have for the first time simultaneously measured the γ-ray and neutron emission probabilities of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Pb</a:mi><a:mprescripts/><a:none/><a:mn>208</a:mn></a:mmultiscripts></a:math>. The measurement was performed in inverse kinematics at the Experimental Storage Ring (ESR) of the GSI/FAIR facility, where a <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mmultiscripts><b:mi>Pb</b:mi><b:mprescripts/><b:none/><b:mn>208</b:mn></b:mmultiscripts></b:math> beam interacted through the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mrow><c:mmultiscripts><c:mi>Pb</c:mi><c:mprescripts/><c:none/><c:mn>208</c:mn></c:mmultiscripts><c:mo>(</c:mo><c:mi>p</c:mi><c:mo>,</c:mo><c:msup><c:mrow><c:mi>p</c:mi></c:mrow><c:mo>′</c:mo></c:msup><c:mo>)</c:mo></c:mrow></c:math> reaction with a hydrogen gas jet target. Instead of detecting the γ rays and neutrons emitted by <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"><d:mmultiscripts><d:mi>Pb</d:mi><d:mprescripts/><d:none/><d:mn>208</d:mn></d:mmultiscripts></d:math>, we detected the heavy beamlike residues produced after γ and neutron emission. These heavy residues were fully separated by a dipole magnet of the ESR and were detected with outstanding efficiencies. The comparison of the measured probabilities with model calculations has allowed us to test and select different descriptions of the γ-ray strength function and the nuclear level density available in the literature.

Physical review. CVol. 111(2)
Goethe University Frankfurt (DE), TRIUMF (CA), Los Alamos National Laboratory (US), University of British Columbia (CA), Université de Bordeaux (FR), Universitat de València (ES), GSI Helmholtz Centre for Heavy Ion Research (DE), University of Victoria (CA), Heidelberg University (DE), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Laboratoire Photonique, Numérique et Nanosciences (FR), Grand Accélérateur National d'Ions Lourds (FR), Instituto de Biomedicina de Valencia (ES), Max Planck Institute for Nuclear Physics (DE), Centre Émile Durkheim (FR), UK Astronomy Technology Centre (GB), Chalmers University of Technology (SE), University of Edinburgh (GB), FH Aachen (DE)
Knut och Alice Wallenbergs Stiftelse, European Research Council, Institut national des sciences de l'Univers, Horizon 2020, GSI Helmholtzzentrum für Schwerionenforschung
Openalex Percentile: Top 9%
Nuclear Physics and Applications
3.77
DOIOpen Access PDFOpenAlex
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