I. Dillmann
YOU?
Author Swipe
View article: Direct Neutron Reactions in Storage Rings Utilizing a Supercompact Cyclotron Neutron Target
Direct Neutron Reactions in Storage Rings Utilizing a Supercompact Cyclotron Neutron Target Open
We propose a new approach for a high-density free-neutron target, primarily aimed at nuclear astrophysics reaction studies in inverse kinematics with radioactive ions circulating in a storage ring. The target concept integrates four key su…
View article: Emulation of the calculations of final <i>r</i>-process abundance patterns with a neural network
Emulation of the calculations of final <i>r</i>-process abundance patterns with a neural network Open
This work explores the construction of a fast emulator for the calculation of the final pattern of nucleosynthesis in the rapid neutron capture process (the r -process). An emulator is built using a feed-forward artificial neural network (…
View article: Impact of Newly Measured <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-Delayed Neutron Emitters around <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ni</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>78</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> on Light Element Nucleosynthesis in the Neutrino Wind Following a Neutron Star Merger
Impact of Newly Measured -Delayed Neutron Emitters around on Light Element Nucleosynthesis in the Neutrino Wind Following a Neutron Star Merger Open
Neutron emission probabilities and half-lives of 37 β-delayed neutron emitters from Ni75 to Br92 were measured at the RIKEN Nishina Center in Japan, including 11 one-neutron and 13 two-neutron emission probabilities and six half-lives for …
View article: Bayesian and Monte Carlo approaches to estimating uncertainty for the measurement of the bound-state $β$ decay of $^{205}\mathrm{Tl}^{81+}$
Bayesian and Monte Carlo approaches to estimating uncertainty for the measurement of the bound-state $β$ decay of $^{205}\mathrm{Tl}^{81+}$ Open
The measurement of the bound-state $β$ decay of $^{205}\mathrm{Tl}^{81+}$ at the Experimental Storage Ring at GSI, Darmstadt, has recently been reported with substantial impact on the use of $^{205}\mathrm{Pb}$ as an early Solar System chr…
View article: First Measurement of a Weak <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>r</mml:mi></mml:math>-Process Reaction on a Radioactive Nucleus
First Measurement of a Weak -Process Reaction on a Radioactive Nucleus Open
This Letter reports on the first cross-section measurements for the ^{94}Sr(α,n)^{97}Zr and ^{86}Kr(α,n)^{89}Sr reactions. In particular, our measurement of ^{94}Sr(α,n)^{97}Zr is the first weak r-process reaction cross section obtained us…
View article: Nuclear Astrophysics in the Storage Ring: Background Suppressed Simultaneous Measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> Reactions
Nuclear Astrophysics in the Storage Ring: Background Suppressed Simultaneous Measurement of and Reactions Open
We report the application of the new elimination of Rutherford elastic scattering technique for the measurement of proton-induced reaction cross sections utilizing stored ions decelerated to astrophysical energies. This approach results in…
View article: First simultaneous measurement of the γ-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring
First simultaneous measurement of the γ-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring Open
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 partic…
View article: First Measurement of the Neutron-Emission Probability with a Surrogate Reaction in Inverse Kinematics at a Heavy-Ion Storage Ring
First Measurement of the Neutron-Emission Probability with a Surrogate Reaction in Inverse Kinematics at a Heavy-Ion Storage Ring Open
Neutron-induced reaction cross sections of short-lived nuclei are imperative to understand the origin of heavy elements in stellar nucleosynthesis and for societal applications, but their measurement is extremely complicated due to the rad…
View article: Emulation of the final r-process abundance pattern with a neural network
Emulation of the final r-process abundance pattern with a neural network Open
This work explores the construction of a fast emulator for the calculation of the final pattern of nucleosynthesis in the rapid neutron capture process (the $r$-process). An emulator is built using a feed-forward artificial neural network …
View article: Investigation of direct nuclear reactions in a storage ring using in-ring detection
Investigation of direct nuclear reactions in a storage ring using in-ring detection Open
Background: Experiments involving nuclear reactions in a storage ring offer exceptional possibilities for precise measurements in inverse kinematics. These experiments provide excellent angular and energy resolution by particle spectroscop…
View article: Measurement of the Isolated Nuclear Two-Photon Decay in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mmultiscripts> <mml:mrow> <mml:mi>Ge</mml:mi> </mml:mrow> <mml:mprescripts/> <mml:none/> <mml:mrow> <mml:mn>72</mml:mn> </mml:mrow> </mml:mmultiscripts> </mml:mrow> </mml:math>
Measurement of the Isolated Nuclear Two-Photon Decay in Open
The nuclear two-photon or double-gamma ( 2 γ ) decay is a second-order electromagnetic process whereby a nucleus in an excited state emits two gamma rays simultaneously. To be able to directly measure the 2 γ decay rate in the low-ener…
View article: Uncertainty quantification of mass models using ensemble Bayesian model averaging
Uncertainty quantification of mass models using ensemble Bayesian model averaging Open
Developments in the description of the masses of atomic nuclei have led to various nuclear mass models that provide predictions for masses across the whole chart of nuclides. These mass models play an important role in understanding the sy…
View article: First Exploration of Monopole-Driven Shell Evolution above the N = 126 shell closure: new Millisecond Isomers in 213Tl and 215Tl
First Exploration of Monopole-Driven Shell Evolution above the N = 126 shell closure: new Millisecond Isomers in 213Tl and 215Tl Open
Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for the first time at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. New millisecond isomers have been identified at low e…
View article: First measurement of the neutron-emission probability with a surrogate reaction in inverse kinematics at a heavy-ion storage ring
First measurement of the neutron-emission probability with a surrogate reaction in inverse kinematics at a heavy-ion storage ring Open
Neutron-induced reaction cross sections of short-lived nuclei are imperative to understand the origin of heavy elements in stellar nucleosynthesis and for societal applications, but their measurement is extremely complicated due to the rad…
View article: Measurement of the Isolated Nuclear Two-Photon Decay in $^{72}\mathrm{Ge}$
Measurement of the Isolated Nuclear Two-Photon Decay in $^{72}\mathrm{Ge}$ Open
The nuclear two-photon or double-gamma ($2γ$) decay is a second-order electromagnetic process whereby a nucleus in an excited state emits two gamma rays simultaneously. To be able to directly measure the $2γ$ decay rate in the low-energy r…
View article: Determining neutron-induced reaction cross sections through surrogate reactions at storage rings
Determining neutron-induced reaction cross sections through surrogate reactions at storage rings Open
Determining the cross sections of neutron-induced reactions on short-lived nuclei is imperative to rate calculations in stellar nucleosynthesis and applications of nuclear physics. It is also an immense experimental challenge due to the ra…
View article: Decay Spectroscopy of $^{160}$Eu: Quasiparticle Configurations of\n Excited States and Structure of $K^\\pi$=$4^+$ Band-heads in $^{160}$Gd
Decay Spectroscopy of $^{160}$Eu: Quasiparticle Configurations of\n Excited States and Structure of $K^\\pi$=$4^+$ Band-heads in $^{160}$Gd Open
\\noindent \\textbf{Background:} Detailed spectroscopy of neutron-rich, heavy,\ndeformed nuclei is of broad interest for nuclear astrophysics and nuclear\nstructure. Nuclei in the r-process path and following freeze-out region impact\nthe …
View article: Uncertainty Quantification of Mass Models using Ensemble Bayesian Model Averaging
Uncertainty Quantification of Mass Models using Ensemble Bayesian Model Averaging Open
Developments in the description of the masses of atomic nuclei have led to various nuclear mass models that provide predictions for masses across the whole chart of nuclides. These mass models play an important role in understanding the sy…
View article: Proton capture on stored radioactive <sup>118</sup>Te ions
Proton capture on stored radioactive <sup>118</sup>Te ions Open
Experimental determination of the cross sections of proton capture on radioactive nuclei is extremely difficult. Therefore, it is of substantial interest for the understanding of the production of the p-nuclei. For the first time, a direct…
View article: Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A∼160)
Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A∼160) Open
At the RIKEN Nishina Center, exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured. This work reports their half-lives ( T 1/2 ) and β-delayed neutron-emission probabilities ( P xn ). The setup consisted of the BigRIPS in-fl…
View article: Indirect measurements of neutron-induced reaction cross sections at heavy-ion storage rings
Indirect measurements of neutron-induced reaction cross sections at heavy-ion storage rings Open
Neutron-induced reaction cross sections of unstable nuclei are essential for understanding the synthesis of heavy elements in stars and for applications in nuclear technology. However, their measurement is very complicated due to the radio…
View article: Study of decay properties of Ba to Nd nuclei (A~160) relevant to the formation of the r-process rare-earth peak
Study of decay properties of Ba to Nd nuclei (A~160) relevant to the formation of the r-process rare-earth peak Open
Half-lifes ( T 1/2 ) of exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured at the RIKEN Nishina Center. The experimental setup consisted of the BigRIPS in-flight separator for ion selection identification, the Advance Imp…
View article: Indirect measurements of neutron-induced reaction cross sections at storage rings
Indirect measurements of neutron-induced reaction cross sections at storage rings Open
Neutron-induced reaction cross sections of unstable nuclei are essential for understanding the synthesis of heavy elements in stars. However, their measurement is very difficult due to the radioactivity of the targets involved. We propose …