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Torsten Soldner - One of the best experts on this subject based on the ideXlab platform.
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Abrupt shape transition at Neutron Number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing
Physical Review C, 2017Co-Authors: J.-m. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
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abrupt shape transition at Neutron Number n 60 b e2 values in sr94 96 98 from fast γ γ timing
Physical Review C, 2017Co-Authors: J.-m. Régis, J. Jolie, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, N Saedsamii, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
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Abrupt shape transition at Neutron Number N=60: B(E2) values in Sr-94,Sr-96,Sr-98 from fast gamma-gamma timing
2017Co-Authors: J.-m. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich Sr-94,Sr-96,Sr-98 have been measured by Germanium-gated gamma-gamma fast timing with LaBr3(Ce) detectors using the EXILL& FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N = 60 is identified as being caused by many-proton excitations to its g(9/2) orbit.
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Abrupt shape transition at Neutron Number N = 60 : B ( E 2 ) values in $^{ 94 , 96 , 98}$Sr from fast $\gamma − \gamma$ timing
Physical Review C, 2017Co-Authors: M. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
C. Schmitt - One of the best experts on this subject based on the ideXlab platform.
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Evolution of uranium fission-fragment charge yields with Neutron Number
The European Physical Journal A, 2017Co-Authors: Peter Möller, C. SchmittAbstract:We use the Brownian shape-motion model, with its recent extensions, which allow modeling of odd-even staggering, to calculate the evolution of fission-fragment charge distributions with Neutron Number for the compound-system sequence 234U, 236U, 238U, and 240U. We compare to experimental data where available, for Neutron- and electromagnetic-induced fission over a compound-nucleus excitation energy range from about 6 to 20 MeV. A notable result of the study is that the evolution of the location of the peak charge yield from \(Z=54\) in 234U towards \(Z=52\) in heavier isotopes, seen in the experimental data, is present also in the calculated yields. We further show that to describe yields at higher compound-nucleus excitation energies, then, already at 20 MeV, it is necessary to take multi-chance fission into account.
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Evolution of uranium fission-fragment charge yields with Neutron Number. Strong effect of multi-chance fission on yield asymmetries
European Physical Journal A, 2017Co-Authors: Peter Möller, C. SchmittAbstract:We use the Brownian shape-motion model, with its recent extensions, which allow modeling of odd-even staggering, to calculate the evolution of fission-fragment charge distributions with Neutron Number for the compound-system sequence 234U, 236U, 238U, and 240U. We compare to experimental data where available, for Neutron- and electromagnetic-induced fission over a compound-nucleus excitation energy range from about 6 to 20MeV. A notable result of the study is that the evolution of the location of the peak charge yield from Z = 54 in 234U towards Z = 52 in heavier isotopes, seen in the experimental data, is present also in the calculated yields. We further show that to describe yields at higher compound-nucleus excitation energies, then, already at 20MeV, it is necessary to take multi-chance fission into account.
Peter Möller - One of the best experts on this subject based on the ideXlab platform.
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Evolution of uranium fission-fragment charge yields with Neutron Number
The European Physical Journal A, 2017Co-Authors: Peter Möller, C. SchmittAbstract:We use the Brownian shape-motion model, with its recent extensions, which allow modeling of odd-even staggering, to calculate the evolution of fission-fragment charge distributions with Neutron Number for the compound-system sequence 234U, 236U, 238U, and 240U. We compare to experimental data where available, for Neutron- and electromagnetic-induced fission over a compound-nucleus excitation energy range from about 6 to 20 MeV. A notable result of the study is that the evolution of the location of the peak charge yield from \(Z=54\) in 234U towards \(Z=52\) in heavier isotopes, seen in the experimental data, is present also in the calculated yields. We further show that to describe yields at higher compound-nucleus excitation energies, then, already at 20 MeV, it is necessary to take multi-chance fission into account.
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Evolution of uranium fission-fragment charge yields with Neutron Number. Strong effect of multi-chance fission on yield asymmetries
European Physical Journal A, 2017Co-Authors: Peter Möller, C. SchmittAbstract:We use the Brownian shape-motion model, with its recent extensions, which allow modeling of odd-even staggering, to calculate the evolution of fission-fragment charge distributions with Neutron Number for the compound-system sequence 234U, 236U, 238U, and 240U. We compare to experimental data where available, for Neutron- and electromagnetic-induced fission over a compound-nucleus excitation energy range from about 6 to 20MeV. A notable result of the study is that the evolution of the location of the peak charge yield from Z = 54 in 234U towards Z = 52 in heavier isotopes, seen in the experimental data, is present also in the calculated yields. We further show that to describe yields at higher compound-nucleus excitation energies, then, already at 20MeV, it is necessary to take multi-chance fission into account.
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A method to calculate fission-fragment yields Y(Z,N) versus proton and Neutron Number in the Brownian shape-motion model
The European Physical Journal A, 2015Co-Authors: Peter Möller, Takatoshi IchikawaAbstract:We propose a method to calculate the two-dimensional (2D) fission-fragment yield \(Y(Z,N)\) versus both proton and Neutron Number, with inclusion of odd-even staggering effects in both variables. The approach is to use the Brownian shape-motion on a macroscopic-microscopic potential-energy surface which, for a particular compound system is calculated versus four shape variables: elongation (quadrupole moment Q2), neck d , left nascent fragment spheroidal deformation \( \epsilon_{f1}\), right nascent fragment deformation \( \epsilon_{f2}\) and two asymmetry variables, namely proton and Neutron Numbers in each of the two fragments. The extension of previous models 1) introduces a method to calculate this generalized potential-energy function and 2) allows the correlated transfer of nucleon pairs in one step, in addition to sequential transfer. In the previous version the potential energy was calculated as a function of Z and N of the compound system and its shape, including the asymmetry of the shape. We outline here how to generalize the model from the “compound-system” model to a model where the emerging fragment proton and Neutron Numbers also enter, over and above the compound system composition.
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a method to calculate fission fragment yields y z n versus proton and Neutron Number in the brownian shape motion model application to calculations of u and pu charge yields
arXiv: Nuclear Theory, 2015Co-Authors: Peter Möller, Takatoshi IchikawaAbstract:We propose a method to calculate the two-dimensional (2D) fission-fragment yield $Y(Z,N)$ versus both proton and Neutron Number, with inclusion of odd-even staggering effects in both variables. The approach is to use Brownian shape-motion on a macroscopic-microscopic potential-energy surface which, for a particular compound system is calculated versus four shape variables: elongation (quadrupole moment $Q_2$), neck $d$, left nascent fragment spheroidal deformation $\epsilon_{\rm f1}$, right nascent fragment deformation $\epsilon_{\rm f2}$ and two asymmetry variables, namely proton and Neutron Numbers in each of the two fragments. The extension of previous models 1) introduces a method to calculate this generalized potential-energy function and 2) allows the correlated transfer of nucleon pairs in one step, in addition to sequential transfer. In the previous version the potential energy was calculated as a function of $Z$ and $N$ of the compound system and its shape, including the asymmetry of the shape. We outline here how to generalize the model from the "compound-system" model to a model where the emerging fragment proton and Neutron Numbers also enter, over and above the compound system composition.
Aurelien Blanc - One of the best experts on this subject based on the ideXlab platform.
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Abrupt shape transition at Neutron Number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing
Physical Review C, 2017Co-Authors: J.-m. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
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abrupt shape transition at Neutron Number n 60 b e2 values in sr94 96 98 from fast γ γ timing
Physical Review C, 2017Co-Authors: J.-m. Régis, J. Jolie, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, N Saedsamii, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
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Abrupt shape transition at Neutron Number N=60: B(E2) values in Sr-94,Sr-96,Sr-98 from fast gamma-gamma timing
2017Co-Authors: J.-m. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich Sr-94,Sr-96,Sr-98 have been measured by Germanium-gated gamma-gamma fast timing with LaBr3(Ce) detectors using the EXILL& FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N = 60 is identified as being caused by many-proton excitations to its g(9/2) orbit.
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Abrupt shape transition at Neutron Number N = 60 : B ( E 2 ) values in $^{ 94 , 96 , 98}$Sr from fast $\gamma − \gamma$ timing
Physical Review C, 2017Co-Authors: M. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
N. Warr - One of the best experts on this subject based on the ideXlab platform.
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Abrupt shape transition at Neutron Number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing
Physical Review C, 2017Co-Authors: J.-m. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
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abrupt shape transition at Neutron Number n 60 b e2 values in sr94 96 98 from fast γ γ timing
Physical Review C, 2017Co-Authors: J.-m. Régis, J. Jolie, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, N Saedsamii, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.
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Abrupt shape transition at Neutron Number N=60: B(E2) values in Sr-94,Sr-96,Sr-98 from fast gamma-gamma timing
2017Co-Authors: J.-m. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich Sr-94,Sr-96,Sr-98 have been measured by Germanium-gated gamma-gamma fast timing with LaBr3(Ce) detectors using the EXILL& FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N = 60 is identified as being caused by many-proton excitations to its g(9/2) orbit.
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Abrupt shape transition at Neutron Number N = 60 : B ( E 2 ) values in $^{ 94 , 96 , 98}$Sr from fast $\gamma − \gamma$ timing
Physical Review C, 2017Co-Authors: M. Régis, J. Jolie, N. Saed-samii, N. Warr, M. Pfeiffer, Aurelien Blanc, Michael Jentschel, U. Köster, P. Mutti, Torsten SoldnerAbstract:Lifetimes of low-lying yrast states in Neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-Neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation Numbers of the orbits spanned by eight proton and eight Neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near Neutron Number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.