Indirect measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mi>Sr</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>90</mml:mn> </mml:mmultiscripts> <mml:mo>(</mml:mo> <mml:mi>n</mml:mi> <mm

The intermediate neutron-capture process ($i$ process) has gained notable traction within the past decade as a way to describe stellar abundance observations which cannot be explained by the slow and rapid neutron-capture processes. Despite the general success of $i$-process models, many open questions remain. Among the observations, Zr stands out, as its elemental abundance is difficult to replicate with available $i$-process models, while the reactions that affect its production through the $i$ process are close enough to stability to study experimentally. Here, we present the experimental constraint of the nuclear level density and $\ensuremath{\gamma}$-strength function ($\ensuremath{\gamma}\phantom{\rule{0.16em}{0ex}}\mathrm{SF}$) of $^{91}\mathrm{Sr}$ using the $\ensuremath{\beta}$-Oslo method, which were then input into the TALYS Hauser-Feshbach code to produce the first experimental constraint of the $^{90}\mathrm{Sr}(n,\ensuremath{\gamma})^{91}\mathrm{Sr}$ capture reaction. This constraint was used alongside that of $^{92}\mathrm{Sr}(n,\ensuremath{\gamma})^{93}\mathrm{Sr}$ for a reduction in the uncertainty of [Y/Zr] production in the $i$-process relevant environmental neutron density of ${10}^{13.5}$ and ${10}^{14.5} \text{neutrons}/{\mathrm{cm}}^{3}$.

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Journal
Physical review. C
Published
2025-10-29
DOI
https://doi.org/10.1103/91xj-284t
Primary Topic
Nuclear physics research studies
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article
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Indirect measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mi>Sr</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>90</mml:mn> </mml:mmultiscripts> <mml:mo>(</mml:mo> <mml:mi>n</mml:mi> <mm

C. E. Svensson, A. C. Dombos, Craig Harris, D. Mücher et al.
Physical review. C
Nuclear physics research studies
article

Indirect measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mmultiscripts> <mml:mi>Sr</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>90</mml:mn> </mml:mmultiscripts> <mml:mo>(</mml:mo> <mml:mi>n</mml:mi> <mm

C. E. Svensson, A. C. Dombos, Craig Harris, D. Mücher, Cole Persch, B. Greaves, M. Wiedeking, R. Lewis, W. W. von Seeger, E. Good, N. D. Scielzo, A. Richard, Antonius Torode, D. L. Bleuel, A. Spyrou, S. Lyons, A. Palmisano-Kyle, E. K. Ronning, S. N. Liddick, Pavel A. Denissenkov, P. A. DeYoung, A. Sweet, Yiming Xiao, J. P. Gombas, M. K. Smith, F. Naqvi
article en

Abstract

The intermediate neutron-capture process ($i$ process) has gained notable traction within the past decade as a way to describe stellar abundance observations which cannot be explained by the slow and rapid neutron-capture processes. Despite the general success of $i$-process models, many open questions remain. Among the observations, Zr stands out, as its elemental abundance is difficult to replicate with available $i$-process models, while the reactions that affect its production through the $i$ process are close enough to stability to study experimentally. Here, we present the experimental constraint of the nuclear level density and $\ensuremath{\gamma}$-strength function ($\ensuremath{\gamma}\phantom{\rule{0.16em}{0ex}}\mathrm{SF}$) of $^{91}\mathrm{Sr}$ using the $\ensuremath{\beta}$-Oslo method, which were then input into the TALYS Hauser-Feshbach code to produce the first experimental constraint of the $^{90}\mathrm{Sr}(n,\ensuremath{\gamma})^{91}\mathrm{Sr}$ capture reaction. This constraint was used alongside that of $^{92}\mathrm{Sr}(n,\ensuremath{\gamma})^{93}\mathrm{Sr}$ for a reduction in the uncertainty of [Y/Zr] production in the $i$-process relevant environmental neutron density of ${10}^{13.5}$ and ${10}^{14.5} \text{neutrons}/{\mathrm{cm}}^{3}$.

Physical review. CVol. 112(6)
University of Notre Dame (US), Lawrence Livermore National Laboratory (US), TRIUMF (CA), Hope College (US), Lawrence Berkeley National Laboratory (US), University of Cologne (DE), University of the Witwatersrand (ZA), University of Victoria (CA), Mitchell Institute (US), iThemba Laboratory (ZA), National Superconducting Cyclotron Laboratory (US), Ohio University (US), College Station Medical Center (US), Facility for Rare Isotope Beams, University of Tennessee at Knoxville (US), University of Guelph (CA), The University of Texas at Austin (US), Michigan State University (US), Texas A&M University (US), Mississippi State University (US)
Openalex Percentile: Top 82%
Nuclear physics research studies
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