M. Couder
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View article: Alpha-decay width of a near proton-threshold resonance in the 7Li(α, α) channel
Alpha-decay width of a near proton-threshold resonance in the 7Li(α, α) channel Open
We investigate the alpha-decay width of a near proton-threshold resonance in 11B by the excitation functions of 7Li(α, α) and 7Li(α, α’) reactions. This resonance is an example of loosely bound atomic nuclei, understood as small open quant…
View article: The particle identification detection system of the St. George recoil separator
The particle identification detection system of the St. George recoil separator Open
View article: Machine learning enabled measurements of astrophysical (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi></mml:mrow></mml:math>) reactions with the SECAR recoil separator
Machine learning enabled measurements of astrophysical () reactions with the SECAR recoil separator Open
The synthesis of heavy elements in supernovae is affected by low-energy (n,p) and (p,n) reactions on unstable nuclei, yet experimental data on such reaction rates are scarce. The SECAR (SEparator for CApture Reactions) recoil separator at …
View article: Indirect Measurement of the <sup>3</sup>He(n,p)<sup>3</sup>H Reaction Cross Section at Big Bang Energies
Indirect Measurement of the <sup>3</sup>He(n,p)<sup>3</sup>H Reaction Cross Section at Big Bang Energies Open
Neutron-induced nuclear reactions play an important role in the Big Bang Nucleosynthesis. Their excitation functions are, from an experimental point of view, usually difficult to measure. Nevertheless, in the last decades, big efforts have…
View article: LSTAR — An isobar separator for expanding radioactive ion beam production at the Cyclotron Institute, Texas A&M University
LSTAR — An isobar separator for expanding radioactive ion beam production at the Cyclotron Institute, Texas A&M University Open
View article: Energy, strength, and alpha width measurements of $E_{\rm{c.m.}} = 1323$ and $1487$ keV resonances in $^{15}$N($α,γ$)$^{19}$F
Energy, strength, and alpha width measurements of $E_{\rm{c.m.}} = 1323$ and $1487$ keV resonances in $^{15}$N($α,γ$)$^{19}$F Open
The $^{15}$N($α,γ$)$^{19}$F reaction produces $^{19}$F in asymptotic giant branch (AGB) stars, where the low energy tails of two resonances at $E_{\rm{c.m.}} = 1323 \pm 2$ and $1487 \pm 1.7$ keV are estimated to contribute about $30\%$ of …
View article: Exploring the ap-Process Indirectly through High-Precision (p,t) Reaction Measurements
Exploring the ap-Process Indirectly through High-Precision (p,t) Reaction Measurements Open
View article: Measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mtext> </mml:mtext><mml:msub><mml:mrow><mml:mi>n</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>16</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> Differential Cross Section from 0.8 to 6.5 MeV
Measurement of the Differential Cross Section from 0.8 to 6.5 MeV Open
The cross section of the ^{13}C(α,n)^{16}O reaction is needed for nuclear astrophysics and applications to a precision of 10% or better, yet inconsistencies among 50 years of experimental studies currently lead to an uncertainty of ≈15%. U…
View article: Cross-section measurement of the 18F(alpha,p)21Ne reaction and possible implication for neutron production in explosive helium burning
Cross-section measurement of the 18F(alpha,p)21Ne reaction and possible implication for neutron production in explosive helium burning Open
At the high temperature and density conditions of hot or explosive helium burning, the {sup 18}F({alpha},p){sup 21}Ne reaction may compete successfully wilh the {sup 18}F({beta}{sup +}{nu}) decay. This suggesls {sup 21}Ne({alpha},n) as an …
View article: Online Bayesian Optimization for Beam Alignment in the SECAR Recoil Mass Separator
Online Bayesian Optimization for Beam Alignment in the SECAR Recoil Mass Separator Open
The SEparator for CApture Reactions (SECAR) is a next-generation recoil separator system at the Facility for Rare Isotope Beams (FRIB) designed for the direct measurement of capture reactions on unstable nuclei in inverse kinematics. To ma…
View article: Deep underground measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">B</mml:mi><mml:mprescripts/><mml:none/><mml:mn>11</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">N</mml:mi><mml:mprescripts/><mml:none/><mml:mn>14</mml:mn></mml:mmultiscripts></mml:math>
Deep underground measurement of Open
The primordial elemental abundance composition of the first stars leads to questions about their modes of energy production and nucleosynthesis. The formation of 12C has been thought to occur primarily through the 3α process, ho…
View article: Measurement of charge state distributions using a scintillation screen
Measurement of charge state distributions using a scintillation screen Open
View article: Measurement of Charge State Distributions using a Scintillation Screen
Measurement of Charge State Distributions using a Scintillation Screen Open
Absolute cross sections measured using electromagnetic devices to separate and detect heavy recoiling ions need to be corrected for charge state fractions. Accurate prediction of charge state distributions using theoretical models is not a…
View article: Study of the <sup>44</sup>Ti(α, p)<sup>47</sup>V reaction rate using high-precision <sup>50</sup>Cr(p, t)<sup>48</sup>Cr measurements
Study of the <sup>44</sup>Ti(α, p)<sup>47</sup>V reaction rate using high-precision <sup>50</sup>Cr(p, t)<sup>48</sup>Cr measurements Open
The abundance and distribution of 44 Ti tells us about the nature of the core-collapse supernovae explosions. There is a need to understand the nuclear reaction network creating and destroying 44 Ti in order to use it as a probe for the ex…
View article: Expanding RIB capabilities at the Cyclotron Institute: 3He-LIG production with an isobar separator LSTAR
Expanding RIB capabilities at the Cyclotron Institute: 3He-LIG production with an isobar separator LSTAR Open
View article: First (p,n) reaction measurement in inverse kinematics with SECAR
First (p,n) reaction measurement in inverse kinematics with SECAR Open
Nucleosynthesis in the ν p-process occurs in regions of slightly proton-rich nuclei in the neutrino-driven wind of core-collapse supernovae. The process proceeds via a sequence of (p, γ ) and (n,p) reactions, and depending on the condition…
View article: A technique for studying (n,p) reactions of astrophysical interest using radioactive beams with SECAR
A technique for studying (n,p) reactions of astrophysical interest using radioactive beams with SECAR Open
The formation of nuclei in slightly proton-rich regions of the neutrino-driven wind of core-collapse supernovae could be attributed to the neutrino-p process (νp-process). As it proceeds via a sequence of (p,γ) and (n,p) reactions, it may …
View article: Horizons: nuclear astrophysics in the 2020s and beyond
Horizons: nuclear astrophysics in the 2020s and beyond Open
Nuclear astrophysics is a field at the intersection of nuclear physics and astrophysics, which seeks to understand the nuclear engines of astronomical objects and the origin of the chemical elements. This white paper summarizes progress an…
View article: The DIANA underground accelerator facility project at DUSEL laboratory
The DIANA underground accelerator facility project at DUSEL laboratory Open
The DIANA project (Dakota Ion Accelerators for Nuclear Astrophysics) is a collaboration between the University of Notre Dame, Colorado School of Mines, Regis University, University of North Carolina, Western Michigan University, and Lawren…
View article: First Direct Measurement of C 12 (C 12,n) Mg 23 at Stellar Energies
First Direct Measurement of C 12 (C 12,n) Mg 23 at Stellar Energies Open
Neutrons produced by the carbon fusion reaction C12(C12,n)Mg23 play an important role in stellar nucleosynthesis. However, past studies have shown large discrepancies between experimental data and theory, leading to an uncertain cross sect…
View article: Direct measurement of the low-energy resonances in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Ne</mml:mi><mml:mprescripts/><mml:none/><mml:mn>22</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi>Mg</mml:mi><mml:mprescripts/><mml:none/><mml:mn>26</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> reaction
Direct measurement of the low-energy resonances in reaction Open
The $^{22}\\rm{Ne}(\\alpha,\\gamma)^{26}\\rm{Mg}$ is an important reaction in\nstellar helium burning environments as it competes directly with one of the\nmain neutron sources for the s-process, the\n$^{22}\\rm{Ne}(\\alpha,n)^{25}\\rm{Mg}…
View article: Online Bayesian optimization for a recoil mass separator
Online Bayesian optimization for a recoil mass separator Open
The SEparator for CApture Reactions (SECAR) is a next-generation recoil\nseparator system at the Facility for Rare Isotope Beams (FRIB) designed for the\ndirect measurement of capture reactions on unstable nuclei in inverse\nkinematics. To…
View article: SECAR: A recoil separator for nuclear astrophysics
SECAR: A recoil separator for nuclear astrophysics Open
Proton-and alpha-capture reactions on unstable proton-rich nuclei power astrophysical explosions like novae and X-ray bursts. Direct measurements of these reactions are crucial for understanding the mechanisms behind these explosions and t…
View article: Online Bayesian Optimization for Beam Alignment in the SECAR Recoil Mass Separator
Online Bayesian Optimization for Beam Alignment in the SECAR Recoil Mass Separator Open
The SEparator for CApture Reactions (SECAR) is a next-generation recoil separator system at the Facility for Rare Isotope Beams (FRIB) designed for the direct measurement of capture reactions on unstable nuclei in inverse kinematics. To ma…
View article: The status and future of direct nuclear reaction measurements for stellar burning
The status and future of direct nuclear reaction measurements for stellar burning Open
The study of stellar burning began just over 100 years ago. Nonetheless, we do not yet have a detailed picture of the nucleosynthesis within stars and how nucleosynthesis impacts stellar structure and the remnants of stellar evolution. Ach…
View article: Indirect study of the <sup>3</sup>He(n, p)<sup>3</sup>H reaction at cosmological energies
Indirect study of the <sup>3</sup>He(n, p)<sup>3</sup>H reaction at cosmological energies Open
In the network of reactions present in the Big Bang nucleosynthesis, the 3 He(n, p) 3 H reaction has an important role which impacts the final 7 Li abundance. The Trojan Horse Method (THM) has been applied to the 3 He(d, pt)H reaction in o…
View article: Global R-matrix analysis of the <sup>11</sup>B(α,n)<sup>14</sup>N reaction
Global R-matrix analysis of the <sup>11</sup>B(α,n)<sup>14</sup>N reaction Open
Reactions that populate the 15 N system have implications for nucleosynthesis through the 11 B( α, n ) 14 N and 14 N( n, p ) 14 C reactions and the 14 N( n, p ) 14 C reaction is also a key component in modeling atmospheric 14 C production.…
View article: Evaluation of experimental constraints on the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Ti</mml:mi><mml:mprescripts/><mml:none/><mml:mn>44</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mi>p</mml:mi><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">V</mml:mi><mml:mprescripts/><mml:none/><mml:mn>47</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> reaction cross section relevant for supernovae
Evaluation of experimental constraints on the reaction cross section relevant for supernovae Open
Due to its importance as an astronomical observable in core-collapse supernovae (CCSNe), the reactions producing and destroying 44Ti must be well constrained. Generally, statistical model calculations such as Hauser-Feshbach are…
View article: New <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>16</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:mrow></mml:math> Cross Section with Implications for Neutrino Mixing and Geoneutrino Measurements
New Cross Section with Implications for Neutrino Mixing and Geoneutrino Measurements Open
Precise antineutrino measurements are very sensitive to proper background characterization. We present an improved measurement of the ^{13}C(α,n)^{16}O reaction cross section which constitutes significant background for large ν[over ¯] det…
View article: Low-energy cross-section measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">B</mml:mi><mml:mprescripts/><mml:none/><mml:mn>10</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">N</mml:mi><mml:mprescripts/><mml:none/><mml:mn>13</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> reaction and its impact on neutron production in first-generation stars
Low-energy cross-section measurement of the reaction and its impact on neutron production in first-generation stars Open
Nucleosynthesis in the first generation of massive stars offers a unique setting to explore the creation of the first heavier nuclei in an environment free of impurities from earlier stellar generations. In later generations of massive sta…