Jutta Escher
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View article: Microscopic optical potentials from a Green's function approach
Microscopic optical potentials from a Green's function approach Open
Optical potentials are a standard tool in the study of nuclear reactions, as they describe the interaction between a target nucleus and a projectile. The use of phenomenological optical potentials built using experimental data on stable is…
View article: Constraining capture cross sections using proton inelastic scattering as a surrogate reaction
Constraining capture cross sections using proton inelastic scattering as a surrogate reaction Open
The surrogate reaction method is an alternative to direct measurements of compound nuclear reaction cross sections. We introduce theory tools for extracting capture cross sections from experiments that use proton inelastic scattering as a …
View article: Ab initio symmetry-adapted approaches to nuclear reactions
Ab initio symmetry-adapted approaches to nuclear reactions Open
In this review, we discuss recent applications of the ab initio symmetry-adapted no-core shell-model (SA-NCSM) theory for study and prediction of structure and reactions of stable and unstable nuclei from light to medium mass range. We exp…
First -Delayed Two-Neutron Spectroscopy of the -Process Nucleus and Observation of the Single-Particle Neutron State in Open
View article: Coupling between collective modes in the deformed <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Zr</mml:mi><mml:mprescripts/><mml:none/><mml:mn>98</mml:mn></mml:mmultiscripts></mml:math> nucleus: Insights from consistent <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>HFB</mml:mi><mml:mo>+</mml:mo><mml:mi>QRPA</mml:mi></mml:mrow></mml:math> calculations with the Gogny interaction
Coupling between collective modes in the deformed nucleus: Insights from consistent calculations with the Gogny interaction Open
View article: Ab initio informed 20Ne(p, pα)16O reaction elucidates the emergence of alpha clustering from chiral potentials
Ab initio informed 20Ne(p, pα)16O reaction elucidates the emergence of alpha clustering from chiral potentials Open
We report on the first ab initio informed α knock-out reaction in the intermediate-mass region, with the aim to probe the underlying chiral potential and its impact on the emergence of alpha clustering in this mass region. The theoretical …
View article: Motivations for early high-profile FRIB experiments
Motivations for early high-profile FRIB experiments Open
This white paper is the result of a collaboration by many of those that attended a workshop at the facility for rare isotope beams (FRIB), organized by the FRIB Theory Alliance (FRIB-TA), on ‘Theoretical Justifications and Motivations for …
View article: Extending the Dispersive Optical Model to beta-unstable Systems
Extending the Dispersive Optical Model to beta-unstable Systems Open
View article: Towards next-generation optical potentials for nuclear reactions and structure calculations
Towards next-generation optical potentials for nuclear reactions and structure calculations Open
View article: Electric dipole excitations near the neutron separation energies in $^{96}$Mo
Electric dipole excitations near the neutron separation energies in $^{96}$Mo Open
Electric dipole strength near the neutron separation energy significantly impacts nuclear structure properties and astrophysical scenarios. These excitations are complex in nature and may involve the so-called pygmy dipole resonance (PDR).…
View article: Correcting for neutron width fluctuations in Hauser-Feshbach gamma branching ratios
Correcting for neutron width fluctuations in Hauser-Feshbach gamma branching ratios Open
Porter-Thomas fluctuations of neutron widths skew compound nuclear decay probabilities from their statistical Hauser-Feshbach values. We present a straightforward method to correct Hauser-Feshbach calculations for these fluctuations, usefu…
View article: Electric dipole excitations near the neutron separation energies in <sup>96</sup>Mo
Electric dipole excitations near the neutron separation energies in <sup>96</sup>Mo Open
Electric dipole strength near the neutron separation energy significantly impacts nuclear structure properties and astrophysical scenarios. These excitations are complex in nature and may involve the so-called pygmy dipole resonance (PDR).…
View article: Extending the Dispersive Optical Model to <i>β</i>-unstable Systems
Extending the Dispersive Optical Model to <i>β</i>-unstable Systems Open
Phenomenological optical-model potentials (OMPs) are a key ingredient for nuclear cross section libraries that enter astrophysical nucleosynthesis simulations. While existing OMPs can reliably reproduce direct reaction cross sections on β-…
View article: Building bridges between nuclear structure and reactions
Building bridges between nuclear structure and reactions Open
The past couple of decades have seen tremendous advances in nuclear structure and reaction theory. Innovative theory frameworks for describing the nuclear many-body system, increasingly powerful computers, and opportunities for confronting…
View article: The Surrogate Nuclear Reaction Method: Concept, recent advances, and new opportunities
The Surrogate Nuclear Reaction Method: Concept, recent advances, and new opportunities Open
Cross sections for compound-nuclear (CN) reactions are important for nuclear astrophysics and other applications. Direct measurements are not always possible for the reactions of interest and calculations without experimental constraints c…
View article: Ab initio informed 20Ne(p, p$α$)16O reaction elucidates the emergence of alpha clustering from chiral potentials
Ab initio informed 20Ne(p, p$α$)16O reaction elucidates the emergence of alpha clustering from chiral potentials Open
We report on the first \textit{ab initio} informed $α$ knock-out reaction in the intermediate-mass region, with the aim to probe the underlying chiral potential and its impact on the emergence of alpha clustering in this mass region. The t…
View article: Towards next-generation optical potentials for nuclear reactions and structure calculations
Towards next-generation optical potentials for nuclear reactions and structure calculations Open
Optical-model potentials (OMPs) are critical ingredients for basic and applied nuclear physics. Present-day computational capabilities allow us to generate data-driven nucleon-nucleus OMPs that are non-local and exactly dispersive (as theo…
View article: Motivations for Early High-Profile FRIB Experiments
Motivations for Early High-Profile FRIB Experiments Open
This white paper is the result of a collaboration by those that attended a workshop at the Facility for Rare Isotope Beams (FRIB), organized by the FRIB Theory Alliance (FRIB-TA), on Theoretical Justifications and Motivations for Early Hig…
View article: Correcting for neutron width fluctuations in Hauser-Feshbach gamma branching ratios
Correcting for neutron width fluctuations in Hauser-Feshbach gamma branching ratios Open
Porter-Thomas fluctuations of neutron widths skew compound nuclear decay probabilities from their statistical Hauser-Feshbach values. We present a straightforward method to correct Hauser-Feshbach calculations for these fluctuations, usefu…
View article: Compound-Nucleus and Doorway-State Decays of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-Delayed Neutron Emitters <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">K</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>51</mml:mn><mml:mo>,</mml:mo><mml:mn>52</mml:mn><mml:mo>,</mml:mo><mml:mn>53</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>
Compound-Nucleus and Doorway-State Decays of -Delayed Neutron Emitters Open
We investigated decays of K
View article: Predicting nucleon-nucleus scattering observables using nuclear structure theory
Predicting nucleon-nucleus scattering observables using nuclear structure theory Open
Developing a predictive capability for inelastic scattering will find applications in multiple areas. Experimental data for neutron-nucleus inelastic scattering is limited and thus one needs a robust theoretical framework to complement it.…
View article: Coupling between collective modes in the deformed $^{98}$Zr nucleus: Insights from consistent HFB+QRPA calculations with the Gogny interaction
Coupling between collective modes in the deformed $^{98}$Zr nucleus: Insights from consistent HFB+QRPA calculations with the Gogny interaction Open
The Zirconium isotopes exhibit structural properties that present multiple challenges to nuclear theory. Investigations of the coupling present within isoscalar modes and within isovector modes are scarce but important for advancing our un…
View article: Evidence of nonstatistical neutron emission following <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math> decay near doubly magic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Sn</mml:mi><mml:mprescripts/><mml:none/><mml:mn>132</mml:mn></mml:mmultiscripts></mml:math>
Evidence of nonstatistical neutron emission following decay near doubly magic Open
Models of the β-delayed neutron emission (βn) assume that neutrons are emitted statistically via an intermediate compound nucleus post β decay. Evidence to the contrary was found in an In
View article: Cross sections for neutron-induced reactions from surrogate data: Reexamining the Weisskopf-Ewing approximation for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:msup><mml:mi>n</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mo>)</mml:mo></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mn>2</mml:mn><mml:mi>n</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math>reactions
Cross sections for neutron-induced reactions from surrogate data: Reexamining the Weisskopf-Ewing approximation forandreactions Open
Background: Modeling nuclear reaction networks for nuclear science applications and for simulations of astrophysical environments relies on cross section data for a vast number of reactions, many of which have never been measured. Cross se…
View article: Improving nuclear data evaluations with predictive reaction theory and indirect measurements
Improving nuclear data evaluations with predictive reaction theory and indirect measurements Open
Nuclear reaction data required for astrophysics and applications is incomplete, as not all nuclear reactions can be measured or reliably predicted. Neutron-induced reactions involving unstable targets are particularly challenging, but ofte…
View article: Optical potentials for the rare-isotope beam era
Optical potentials for the rare-isotope beam era Open
We review recent progress and motivate the need for further developments in nuclear optical potentials that are widely used in the theoretical analysis of nucleon elastic scattering and reaction cross sections. In regions of the nuclear ch…
View article: Uncertainty-quantified phenomenological optical potentials for single-nucleon scattering
Uncertainty-quantified phenomenological optical potentials for single-nucleon scattering Open
Optical-model potentials (OMPs) continue to play a key role in nuclear reaction calculations. However, the uncertainty of phenomenological OMPs in widespread use—inherent to any parametric model trained on data—has not been fully character…
View article: Improving nuclear data evaluations with predictive reaction theory and indirect measurements
Improving nuclear data evaluations with predictive reaction theory and indirect measurements Open
Nuclear reaction data required for astrophysics and applications is incomplete, as not all nuclear reactions can be measured or reliably predicted. Neutron-induced reactions involving unstable targets are particularly challenging, but ofte…
View article: A Problem in the Statistical Description of Beta-Delayed Neutron Emission
A Problem in the Statistical Description of Beta-Delayed Neutron Emission Open
Reaction measurements on fission products are being planned at both Argonne National Lab and at the Facility for Rare Isotope Beams. These indirect experiments produce specific short-lived nuclei via beta decay, and the subsequent neutron …
View article: A Problem in the Statistical Description of Beta-Delayed Neutron Emission
A Problem in the Statistical Description of Beta-Delayed Neutron Emission Open
Reaction measurements on fission products are being planned at both Argonne National Lab and at the Facility for Rare Isotope Beams. These indirect experiments produce specific short-lived nuclei via beta decay, and the subsequent neutron …