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M. P. Carpenter - One of the best experts on this subject based on the ideXlab platform.
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Stability and synthesis of superheavy elements: Fighting the battle against Fission – example of $^{254}$No
2016Co-Authors: A. Lopez-martens, G. Henning, T. L. Khoo, D. Seweryniak, B. B. Back, D. Boilley, M. Alcorta, M. Asai, P. Bertone, M. P. CarpenterAbstract:Superheavy nuclei exist solely due to quantum shell effects, which create a pocket in the potential-energy surface of the nucleus, thus providing a Barrier against spontaneous Fission. Determining the height of the Fission Barrier and its angular-momentum dependence is important to quantify the role that microscopic shell corrections play in enhancing and extending the limits of nuclear stability. In this talk, the first measurement of a Fission Barrier in the very heavy nucleus 254No will be presented.
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Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases of No 254 and Th 220
Physical review letters, 2014Co-Authors: G. Henning, A. Lopez-martens, T. L. Khoo, D. Seweryniak, Martín Alcorta, Masato Asai, B. B. Back, P. F. Bertone, D. Boilley, M. P. CarpenterAbstract:We report on the first measurement of the Fission Barrier height in a heavy shell-stabilized nucleus. The Fission Barrier height of No-254 is measured to be B-f = 6.0 +/- 0.5 MeV at spin 15 (h) over bar and, by extrapolation, B-f = 6.6 +/- 0.9 MeV at spin 0 (h) over bar. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The same measurement is performed for Th-220 and only a lower limit of the Fission Barrier height can be determined: B-f (I) > 8 MeV. Comparisons with theoretical Fission Barriers test theories that predict properties of superheavy elements.
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Exploring the stability of super heavy elements: First measurement of the Fission Barrier of 254No
EPJ Web of Conferences, 2014Co-Authors: G. Henning, A. Lopez-martens, T. L. Khoo, D. Seweryniak, Martín Alcorta, Masato Asai, B. B. Back, P. F. Bertone, D. Boilley, M. P. CarpenterAbstract:The gamma-ray multiplicity and total energy emitted by the heavy nucleus 254No have been measured at 2 different beam energies. From these measurements, the initial distributions of spin I and excitation energy E * of 254No were constructed. The distributions display a saturation in excitation energy, which allows a direct determination of the Fission Barrier. 254No is the heaviest shell-stabilized nucleus with a measured Fission Barrier. © Owned by the authors, published by EDP Sciences, 2014.
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entry distribution Fission Barrier and formation mechanism of sup 254 ovr sub 102 no
Physical Review Letters, 2000Co-Authors: P Reiter, T. L. Khoo, D. Seweryniak, M. P. Carpenter, T Lauritsen, C J Lister, A A Sonzogni, I Ahmad, J A Cizewski, C N DavidsAbstract:The entry distribution in angular momentum and excitation energy for the formation of {sup 254}No has been measured after the {sup 208}Pb( {sup 48}Ca, 2 n) reaction at 215 and 219 MeV. This nucleus is populated up to spin 22({Dirac_h}/2{pi}) and excitation energy (greater-or-similar sign)6 MeV above the yrast line, with the half-maximum points of the energy distributions at {approx}5 MeV for spins between 12({Dirac_h}/2{pi}) and 22({Dirac_h}/2{pi}) . This suggests that the Fission Barrier is (greater-or-similar sign)5 MeV and that the shell-correction energy persists to high spin. (c) 2000 The American Physical Society.
T. L. Khoo - One of the best experts on this subject based on the ideXlab platform.
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Stability and synthesis of superheavy elements: Fighting the battle against Fission – example of $^{254}$No
2016Co-Authors: A. Lopez-martens, G. Henning, T. L. Khoo, D. Seweryniak, B. B. Back, D. Boilley, M. Alcorta, M. Asai, P. Bertone, M. P. CarpenterAbstract:Superheavy nuclei exist solely due to quantum shell effects, which create a pocket in the potential-energy surface of the nucleus, thus providing a Barrier against spontaneous Fission. Determining the height of the Fission Barrier and its angular-momentum dependence is important to quantify the role that microscopic shell corrections play in enhancing and extending the limits of nuclear stability. In this talk, the first measurement of a Fission Barrier in the very heavy nucleus 254No will be presented.
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Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases of No 254 and Th 220
Physical review letters, 2014Co-Authors: G. Henning, A. Lopez-martens, T. L. Khoo, D. Seweryniak, Martín Alcorta, Masato Asai, B. B. Back, P. F. Bertone, D. Boilley, M. P. CarpenterAbstract:We report on the first measurement of the Fission Barrier height in a heavy shell-stabilized nucleus. The Fission Barrier height of No-254 is measured to be B-f = 6.0 +/- 0.5 MeV at spin 15 (h) over bar and, by extrapolation, B-f = 6.6 +/- 0.9 MeV at spin 0 (h) over bar. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The same measurement is performed for Th-220 and only a lower limit of the Fission Barrier height can be determined: B-f (I) > 8 MeV. Comparisons with theoretical Fission Barriers test theories that predict properties of superheavy elements.
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Exploring the stability of super heavy elements: First measurement of the Fission Barrier of 254No
EPJ Web of Conferences, 2014Co-Authors: G. Henning, A. Lopez-martens, T. L. Khoo, D. Seweryniak, Martín Alcorta, Masato Asai, B. B. Back, P. F. Bertone, D. Boilley, M. P. CarpenterAbstract:The gamma-ray multiplicity and total energy emitted by the heavy nucleus 254No have been measured at 2 different beam energies. From these measurements, the initial distributions of spin I and excitation energy E * of 254No were constructed. The distributions display a saturation in excitation energy, which allows a direct determination of the Fission Barrier. 254No is the heaviest shell-stabilized nucleus with a measured Fission Barrier. © Owned by the authors, published by EDP Sciences, 2014.
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entry distribution Fission Barrier and formation mechanism of sup 254 ovr sub 102 no
Physical Review Letters, 2000Co-Authors: P Reiter, T. L. Khoo, D. Seweryniak, M. P. Carpenter, T Lauritsen, C J Lister, A A Sonzogni, I Ahmad, J A Cizewski, C N DavidsAbstract:The entry distribution in angular momentum and excitation energy for the formation of {sup 254}No has been measured after the {sup 208}Pb( {sup 48}Ca, 2 n) reaction at 215 and 219 MeV. This nucleus is populated up to spin 22({Dirac_h}/2{pi}) and excitation energy (greater-or-similar sign)6 MeV above the yrast line, with the half-maximum points of the energy distributions at {approx}5 MeV for spins between 12({Dirac_h}/2{pi}) and 22({Dirac_h}/2{pi}) . This suggests that the Fission Barrier is (greater-or-similar sign)5 MeV and that the shell-correction energy persists to high spin. (c) 2000 The American Physical Society.
D. Seweryniak - One of the best experts on this subject based on the ideXlab platform.
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Stability and synthesis of superheavy elements: Fighting the battle against Fission – example of $^{254}$No
2016Co-Authors: A. Lopez-martens, G. Henning, T. L. Khoo, D. Seweryniak, B. B. Back, D. Boilley, M. Alcorta, M. Asai, P. Bertone, M. P. CarpenterAbstract:Superheavy nuclei exist solely due to quantum shell effects, which create a pocket in the potential-energy surface of the nucleus, thus providing a Barrier against spontaneous Fission. Determining the height of the Fission Barrier and its angular-momentum dependence is important to quantify the role that microscopic shell corrections play in enhancing and extending the limits of nuclear stability. In this talk, the first measurement of a Fission Barrier in the very heavy nucleus 254No will be presented.
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Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases of No 254 and Th 220
Physical review letters, 2014Co-Authors: G. Henning, A. Lopez-martens, T. L. Khoo, D. Seweryniak, Martín Alcorta, Masato Asai, B. B. Back, P. F. Bertone, D. Boilley, M. P. CarpenterAbstract:We report on the first measurement of the Fission Barrier height in a heavy shell-stabilized nucleus. The Fission Barrier height of No-254 is measured to be B-f = 6.0 +/- 0.5 MeV at spin 15 (h) over bar and, by extrapolation, B-f = 6.6 +/- 0.9 MeV at spin 0 (h) over bar. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The same measurement is performed for Th-220 and only a lower limit of the Fission Barrier height can be determined: B-f (I) > 8 MeV. Comparisons with theoretical Fission Barriers test theories that predict properties of superheavy elements.
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Exploring the stability of super heavy elements: First measurement of the Fission Barrier of 254No
EPJ Web of Conferences, 2014Co-Authors: G. Henning, A. Lopez-martens, T. L. Khoo, D. Seweryniak, Martín Alcorta, Masato Asai, B. B. Back, P. F. Bertone, D. Boilley, M. P. CarpenterAbstract:The gamma-ray multiplicity and total energy emitted by the heavy nucleus 254No have been measured at 2 different beam energies. From these measurements, the initial distributions of spin I and excitation energy E * of 254No were constructed. The distributions display a saturation in excitation energy, which allows a direct determination of the Fission Barrier. 254No is the heaviest shell-stabilized nucleus with a measured Fission Barrier. © Owned by the authors, published by EDP Sciences, 2014.
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entry distribution Fission Barrier and formation mechanism of sup 254 ovr sub 102 no
Physical Review Letters, 2000Co-Authors: P Reiter, T. L. Khoo, D. Seweryniak, M. P. Carpenter, T Lauritsen, C J Lister, A A Sonzogni, I Ahmad, J A Cizewski, C N DavidsAbstract:The entry distribution in angular momentum and excitation energy for the formation of {sup 254}No has been measured after the {sup 208}Pb( {sup 48}Ca, 2 n) reaction at 215 and 219 MeV. This nucleus is populated up to spin 22({Dirac_h}/2{pi}) and excitation energy (greater-or-similar sign)6 MeV above the yrast line, with the half-maximum points of the energy distributions at {approx}5 MeV for spins between 12({Dirac_h}/2{pi}) and 22({Dirac_h}/2{pi}) . This suggests that the Fission Barrier is (greater-or-similar sign)5 MeV and that the shell-correction energy persists to high spin. (c) 2000 The American Physical Society.
G. Henning - One of the best experts on this subject based on the ideXlab platform.
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Python implementation of A. Sierk's BARFIT
2020Co-Authors: G. HenningAbstract:Between 1984 and 1986, A. J. Sierk developped the BARFIT (also refered as fisbar) routine to compute Fission Barrier, ground state energy and maximum angular momentum a nucleus can sustain in the framework of the liquid drop model. The 1986 Fortran routine is old and may not compile on modern computers. However, the routine is still of great interest, as it is able to provide an estimate for a Fission Barrier for light elements. This is a re-implementation in python 3.6 of the original routine that will work on most modern computer easily. An online version is also available.
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Stability and synthesis of superheavy elements: Fighting the battle against Fission – example of $^{254}$No
2016Co-Authors: A. Lopez-martens, G. Henning, T. L. Khoo, D. Seweryniak, B. B. Back, D. Boilley, M. Alcorta, M. Asai, P. Bertone, M. P. CarpenterAbstract:Superheavy nuclei exist solely due to quantum shell effects, which create a pocket in the potential-energy surface of the nucleus, thus providing a Barrier against spontaneous Fission. Determining the height of the Fission Barrier and its angular-momentum dependence is important to quantify the role that microscopic shell corrections play in enhancing and extending the limits of nuclear stability. In this talk, the first measurement of a Fission Barrier in the very heavy nucleus 254No will be presented.
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Fission Barrier of Superheavy Nuclei and Persistence of Shell Effects at High Spin: Cases of No 254 and Th 220
Physical review letters, 2014Co-Authors: G. Henning, A. Lopez-martens, T. L. Khoo, D. Seweryniak, Martín Alcorta, Masato Asai, B. B. Back, P. F. Bertone, D. Boilley, M. P. CarpenterAbstract:We report on the first measurement of the Fission Barrier height in a heavy shell-stabilized nucleus. The Fission Barrier height of No-254 is measured to be B-f = 6.0 +/- 0.5 MeV at spin 15 (h) over bar and, by extrapolation, B-f = 6.6 +/- 0.9 MeV at spin 0 (h) over bar. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The same measurement is performed for Th-220 and only a lower limit of the Fission Barrier height can be determined: B-f (I) > 8 MeV. Comparisons with theoretical Fission Barriers test theories that predict properties of superheavy elements.
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Exploring the stability of super heavy elements: First measurement of the Fission Barrier of 254No
EPJ Web of Conferences, 2014Co-Authors: G. Henning, A. Lopez-martens, T. L. Khoo, D. Seweryniak, Martín Alcorta, Masato Asai, B. B. Back, P. F. Bertone, D. Boilley, M. P. CarpenterAbstract:The gamma-ray multiplicity and total energy emitted by the heavy nucleus 254No have been measured at 2 different beam energies. From these measurements, the initial distributions of spin I and excitation energy E * of 254No were constructed. The distributions display a saturation in excitation energy, which allows a direct determination of the Fission Barrier. 254No is the heaviest shell-stabilized nucleus with a measured Fission Barrier. © Owned by the authors, published by EDP Sciences, 2014.
Walter Greiner - One of the best experts on this subject based on the ideXlab platform.
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the Fission Barrier of 240pu in the relativistic mean field theory
Physics Letters B, 1994Co-Authors: V Blum, J A Maruhn, P G Reinhard, Walter GreinerAbstract:Abstract The potential energy surface of 240 Pu has been investigated in the framework of the relativistic mean field theory. The self-consistent field equations were solved numerically on an axially symmetric grid in the coordinate space with the addition of a quadrupole constraint. The double humped Fission Barrier typical for 240 Pu is well reproduced by the model. We discuss the influence of the different parametrizations of the model on the deformed ground state, the first Barrier, the deformed isomeric state and the second Barrier.