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A. Algora - One of the best experts on this subject based on the ideXlab platform.
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development of a reference database for beta Delayed Neutron emission
Nuclear Data Sheets, 2021Co-Authors: P Dimitriou, J. L. Tain, A. Algora, I Dillmann, Bhupinder Singh, V Piksaikin, K P Rykaczewski, K Banerjee, I N BorzovAbstract:Abstract Beta-Delayed Neutron emission is important for nuclear structure and astrophysics as well as for reactor applications. Significant advances in nuclear experimental techniques in the past two decades have led to a wealth of new measurements that remain to be incorporated in the databases. We report on a coordinated effort to compile and evaluate all the available β-Delayed Neutron emission data. The different measurement techniques have been assessed and the data have been compared with semi-microscopic and microscopic-macroscopic models. The new microscopic database has been tested against aggregate total Delayed Neutron yields, time-dependent group parameters in 6-and 8-group re-presentation, and aggregate Delayed Neutron spectra. New recommendations of macroscopic Delayed-Neutron data for fissile materials of interest to applications are also presented. The new Reference Database for Beta-Delayed Neutron Emission Data is available online at: http://www-nds.iaea.org/beta-Delayed-Neutron/database.html .
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development of a reference database for beta Delayed Neutron emission
arXiv: Nuclear Experiment, 2021Co-Authors: P Dimitriou, J. L. Tain, A. Algora, I Dillmann, Bhupinder Singh, V Piksaikin, K P Rykaczewski, K Banerjee, I N BorzovAbstract:Beta-Delayed Neutron emission is important for nuclear structure and astrophysics as well as for reactor applications. Significant advances in nuclear experimental techniques in the past two decades have led to a wealth of new measurements that remain to be incorporated in the databases. We report on a coordinated effort to compile and evaluate all the available beta-Delayed Neutron emission data. The different measurement techniques have been assessed and the data have been compared with semi-microscopic and microscopic-macroscopic models. The new microscopic database has been tested against aggregate total Delayed Neutron yields, time-dependent group parameters in 6-and 8-group re-presentation, and aggregate Delayed Neutron spectra. New recommendations of macroscopic Delayed-Neutron data for fissile materials of interest to applications are also presented. The new Reference Database for Beta-Delayed Neutron Emission Data is available online at: this http URL.
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the briken project extensive measurements of β Delayed Neutron emitters for the astrophysical r process
Acta Physica Polonica B, 2018Co-Authors: J. L. Tain, A. Algora, J. Agramunt, D S Ahn, J M Allmond, H Baba, S Bae, N T Brewer, Caballero R Folch, F CalvinoAbstract:An ambitious program to measure decay properties, primarily β-Delayed Neutron emission probabilities and half-lives, for a significant number of nuclei near or on the path of the rapid Neutron capture process, has been launched at the RIKEN Nishina Center. We give here an overview of the status of the project.
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characterization of a Neutron beta counting system with beta Delayed Neutron emitters
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2016Co-Authors: J. Agramunt, J. L. Tain, A. Algora, M B Gomezhornillos, A R Garcia, F Albiol, R Caballerofolch, F Calvino, D CanoottAbstract:Abstract A new detection system for the measurement of beta-Delayed Neutron emission probabilities has been characterized using fission products with well known β-Delayed Neutron emission properties. The setup consists of BELEN-20, a 4π Neutron counter with twenty 3He proportional tubes arranged inside a large polyethylene Neutron moderator, a thin Si detector for β counting and a self-triggering digital data acquisition system. The use of Delayed-Neutron precursors with different Neutron emission windows allowed the study of the effect of energy dependency on Neutron, β and β–Neutron rates. The observed effect is well reproduced by Monte Carlo simulations. The impact of this dependency on the accuracy of Neutron emission probabilities is discussed. A new accurate value of the Neutron emission probability for the important Delayed-Neutron precursor 137I was obtained, P n = 7.76 ( 14 ) %.
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First Measurement of Several β-Delayed Neutron Emitting Isotopes Beyond N=126
Physical Review Letters, 2016Co-Authors: R. Caballero-folch, A. Algora, J. Agramunt, F Ameil, Y Ayyad, J Benlliure, C. Domingo-pardo, A. Arcones, I. n. Borzov, M BowryAbstract:The β-Delayed Neutron emission probabilities of Neutron rich Hg and Tl nuclei have been measured together with β-decay half-lives for 20 isotopes of Au, Hg, Tl, Pb, and Bi in the mass region N≳126. These are the heaviest species where Neutron emission has been observed so far. These measurements provide key information to evaluate the performance of nuclear microscopic and phenomenological models in reproducing the high-energy part of the β-decay strength distribution. This provides important constraints on global theoretical models currently used in r-process nucleosynthesis.
J. Agramunt - One of the best experts on this subject based on the ideXlab platform.
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the briken project extensive measurements of β Delayed Neutron emitters for the astrophysical r process
Acta Physica Polonica B, 2018Co-Authors: J. L. Tain, A. Algora, J. Agramunt, D S Ahn, J M Allmond, H Baba, S Bae, N T Brewer, Caballero R Folch, F CalvinoAbstract:An ambitious program to measure decay properties, primarily β-Delayed Neutron emission probabilities and half-lives, for a significant number of nuclei near or on the path of the rapid Neutron capture process, has been launched at the RIKEN Nishina Center. We give here an overview of the status of the project.
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characterization of a Neutron beta counting system with beta Delayed Neutron emitters
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2016Co-Authors: J. Agramunt, J. L. Tain, A. Algora, M B Gomezhornillos, A R Garcia, F Albiol, R Caballerofolch, F Calvino, D CanoottAbstract:Abstract A new detection system for the measurement of beta-Delayed Neutron emission probabilities has been characterized using fission products with well known β-Delayed Neutron emission properties. The setup consists of BELEN-20, a 4π Neutron counter with twenty 3He proportional tubes arranged inside a large polyethylene Neutron moderator, a thin Si detector for β counting and a self-triggering digital data acquisition system. The use of Delayed-Neutron precursors with different Neutron emission windows allowed the study of the effect of energy dependency on Neutron, β and β–Neutron rates. The observed effect is well reproduced by Monte Carlo simulations. The impact of this dependency on the accuracy of Neutron emission probabilities is discussed. A new accurate value of the Neutron emission probability for the important Delayed-Neutron precursor 137I was obtained, P n = 7.76 ( 14 ) %.
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First Measurement of Several β-Delayed Neutron Emitting Isotopes Beyond N=126
Physical Review Letters, 2016Co-Authors: R. Caballero-folch, A. Algora, J. Agramunt, F Ameil, Y Ayyad, J Benlliure, C. Domingo-pardo, A. Arcones, I. n. Borzov, M BowryAbstract:The β-Delayed Neutron emission probabilities of Neutron rich Hg and Tl nuclei have been measured together with β-decay half-lives for 20 isotopes of Au, Hg, Tl, Pb, and Bi in the mass region N≳126. These are the heaviest species where Neutron emission has been observed so far. These measurements provide key information to evaluate the performance of nuclear microscopic and phenomenological models in reproducing the high-energy part of the β-decay strength distribution. This provides important constraints on global theoretical models currently used in r-process nucleosynthesis.
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new beta Delayed Neutron measurements in the light mass fission group
Nuclear Data Sheets, 2014Co-Authors: J. Agramunt, A. Algora, A R Garcia, R Caballerofolch, F Calvino, D Canoott, C Domingopardo, G Cortes, J Aysto, T EronenAbstract:A new accurate determination of beta-Delayed Neutron emission probabilities from nuclei in the low mass region of the light fission group has been performed. The measurements were carried out using the BELEN 4π Neutron counter at the IGISOL-JYFL mass separator in combination with a Penning trap. The new results significantly improve the uncertainties of Neutron emission probabilities for {sup 91}Br, {sup 86}As, {sup 85}As, and {sup 85}Ge nuclei.
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gamma Neutron competition above the Neutron separation energy in Delayed Neutron emitters
2013 International Nuclear Physics Conference INPC 2013, 2014Co-Authors: E Valencia, J. L. Tain, A. Algora, J. Agramunt, M Bowry, J Aysto, S Rice, A A Zakariissoufou, V M Bui, R CaballerofolchAbstract:To study the β-decay properties of some well known Delayed Neutron emitters an experiment was performed in 2009 at the IGISOL facility (University of Jyvaskyla in Finland) using Total Absorption -ray Spectroscopy (TAGS) technique. The aim of these measurements is to obtain the full β-strength distribution below the Neutron separation energy (Sn) and the γ/Neutron competition above. This information is a key parameter in nuclear technology applications as well as in nuclear astrophysics and nuclear structure. Preliminary results of the analysis show a significant γ-branching ratio above Sn. © Owned by the authors, published by EDP Sciences, 2014.
J. L. Tain - One of the best experts on this subject based on the ideXlab platform.
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development of a reference database for beta Delayed Neutron emission
Nuclear Data Sheets, 2021Co-Authors: P Dimitriou, J. L. Tain, A. Algora, I Dillmann, Bhupinder Singh, V Piksaikin, K P Rykaczewski, K Banerjee, I N BorzovAbstract:Abstract Beta-Delayed Neutron emission is important for nuclear structure and astrophysics as well as for reactor applications. Significant advances in nuclear experimental techniques in the past two decades have led to a wealth of new measurements that remain to be incorporated in the databases. We report on a coordinated effort to compile and evaluate all the available β-Delayed Neutron emission data. The different measurement techniques have been assessed and the data have been compared with semi-microscopic and microscopic-macroscopic models. The new microscopic database has been tested against aggregate total Delayed Neutron yields, time-dependent group parameters in 6-and 8-group re-presentation, and aggregate Delayed Neutron spectra. New recommendations of macroscopic Delayed-Neutron data for fissile materials of interest to applications are also presented. The new Reference Database for Beta-Delayed Neutron Emission Data is available online at: http://www-nds.iaea.org/beta-Delayed-Neutron/database.html .
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development of a reference database for beta Delayed Neutron emission
arXiv: Nuclear Experiment, 2021Co-Authors: P Dimitriou, J. L. Tain, A. Algora, I Dillmann, Bhupinder Singh, V Piksaikin, K P Rykaczewski, K Banerjee, I N BorzovAbstract:Beta-Delayed Neutron emission is important for nuclear structure and astrophysics as well as for reactor applications. Significant advances in nuclear experimental techniques in the past two decades have led to a wealth of new measurements that remain to be incorporated in the databases. We report on a coordinated effort to compile and evaluate all the available beta-Delayed Neutron emission data. The different measurement techniques have been assessed and the data have been compared with semi-microscopic and microscopic-macroscopic models. The new microscopic database has been tested against aggregate total Delayed Neutron yields, time-dependent group parameters in 6-and 8-group re-presentation, and aggregate Delayed Neutron spectra. New recommendations of macroscopic Delayed-Neutron data for fissile materials of interest to applications are also presented. The new Reference Database for Beta-Delayed Neutron Emission Data is available online at: this http URL.
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the briken project extensive measurements of β Delayed Neutron emitters for the astrophysical r process
Acta Physica Polonica B, 2018Co-Authors: J. L. Tain, A. Algora, J. Agramunt, D S Ahn, J M Allmond, H Baba, S Bae, N T Brewer, Caballero R Folch, F CalvinoAbstract:An ambitious program to measure decay properties, primarily β-Delayed Neutron emission probabilities and half-lives, for a significant number of nuclei near or on the path of the rapid Neutron capture process, has been launched at the RIKEN Nishina Center. We give here an overview of the status of the project.
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characterization of a Neutron beta counting system with beta Delayed Neutron emitters
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2016Co-Authors: J. Agramunt, J. L. Tain, A. Algora, M B Gomezhornillos, A R Garcia, F Albiol, R Caballerofolch, F Calvino, D CanoottAbstract:Abstract A new detection system for the measurement of beta-Delayed Neutron emission probabilities has been characterized using fission products with well known β-Delayed Neutron emission properties. The setup consists of BELEN-20, a 4π Neutron counter with twenty 3He proportional tubes arranged inside a large polyethylene Neutron moderator, a thin Si detector for β counting and a self-triggering digital data acquisition system. The use of Delayed-Neutron precursors with different Neutron emission windows allowed the study of the effect of energy dependency on Neutron, β and β–Neutron rates. The observed effect is well reproduced by Monte Carlo simulations. The impact of this dependency on the accuracy of Neutron emission probabilities is discussed. A new accurate value of the Neutron emission probability for the important Delayed-Neutron precursor 137I was obtained, P n = 7.76 ( 14 ) %.
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gamma Neutron competition above the Neutron separation energy in Delayed Neutron emitters
2013 International Nuclear Physics Conference INPC 2013, 2014Co-Authors: E Valencia, J. L. Tain, A. Algora, J. Agramunt, M Bowry, J Aysto, S Rice, A A Zakariissoufou, V M Bui, R CaballerofolchAbstract:To study the β-decay properties of some well known Delayed Neutron emitters an experiment was performed in 2009 at the IGISOL facility (University of Jyvaskyla in Finland) using Total Absorption -ray Spectroscopy (TAGS) technique. The aim of these measurements is to obtain the full β-strength distribution below the Neutron separation energy (Sn) and the γ/Neutron competition above. This information is a key parameter in nuclear technology applications as well as in nuclear astrophysics and nuclear structure. Preliminary results of the analysis show a significant γ-branching ratio above Sn. © Owned by the authors, published by EDP Sciences, 2014.
I Jovanovic - One of the best experts on this subject based on the ideXlab platform.
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scaling beta Delayed Neutron measurements to large detector areas
Journal of Applied Physics, 2017Co-Authors: F Sutanto, J Nattress, I JovanovicAbstract:We explore the performance of a cargo screening system that consists of two large-sized composite scintillation detectors and a high-energy Neutron interrogation source by modeling and simulation. The goal of the system is to measure β-Delayed Neutron emission from an illicit special nuclear material by use of active interrogation. This task is challenging because the β-Delayed Neutron yield is small in comparison with the yield of the prompt fission secondary products, β-Delayed Neutrons are emitted with relatively low energies, and high Neutron and gamma backgrounds are typically present. Detectors used to measure Delayed Neutron emission must exhibit high intrinsic efficiency and cover a large solid angle, which also makes them sensitive to background Neutron radiation. We present a case study where we attempt to detect the presence of 5 kg-scale quantities of 235U in a standard air-filled cargo container using 14 MeV Neutrons as a probe. We find that by using a total measurement time of ∼11.6 s and a ...
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detection of special nuclear material from Delayed Neutron emission induced by a dual particle monoenergetic source
Applied Physics Letters, 2016Co-Authors: Michael F Mayer, J Nattress, I JovanovicAbstract:Detection of unique signatures of special nuclear materials is critical for their interdiction in a variety of nuclear security and nonproliferation scenarios. We report on the observation of Delayed Neutrons from fission of uranium induced in dual-particle active interrogation based on the 11B(d,n γ)12C nuclear reaction. Majority of the fissions are attributed to fast fission induced by the incident quasi-monoenergetic Neutrons. A Li-doped glass–polymer composite scintillation Neutron detector, which displays excellent Neutron/γ discrimination at low energies, was used in the measurements, along with a recoil-based liquid scintillation detector. Time-dependent buildup and decay of Delayed Neutron emission from 238U were measured between the interrogating beam pulses and after the interrogating beam was turned off, respectively. Characteristic buildup and decay time profiles were compared to the common parametrization into six Delayed Neutron groups, finding a good agreement between the measurement and nu...
I Dillmann - One of the best experts on this subject based on the ideXlab platform.
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development of a reference database for beta Delayed Neutron emission
Nuclear Data Sheets, 2021Co-Authors: P Dimitriou, J. L. Tain, A. Algora, I Dillmann, Bhupinder Singh, V Piksaikin, K P Rykaczewski, K Banerjee, I N BorzovAbstract:Abstract Beta-Delayed Neutron emission is important for nuclear structure and astrophysics as well as for reactor applications. Significant advances in nuclear experimental techniques in the past two decades have led to a wealth of new measurements that remain to be incorporated in the databases. We report on a coordinated effort to compile and evaluate all the available β-Delayed Neutron emission data. The different measurement techniques have been assessed and the data have been compared with semi-microscopic and microscopic-macroscopic models. The new microscopic database has been tested against aggregate total Delayed Neutron yields, time-dependent group parameters in 6-and 8-group re-presentation, and aggregate Delayed Neutron spectra. New recommendations of macroscopic Delayed-Neutron data for fissile materials of interest to applications are also presented. The new Reference Database for Beta-Delayed Neutron Emission Data is available online at: http://www-nds.iaea.org/beta-Delayed-Neutron/database.html .
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development of a reference database for beta Delayed Neutron emission
arXiv: Nuclear Experiment, 2021Co-Authors: P Dimitriou, J. L. Tain, A. Algora, I Dillmann, Bhupinder Singh, V Piksaikin, K P Rykaczewski, K Banerjee, I N BorzovAbstract:Beta-Delayed Neutron emission is important for nuclear structure and astrophysics as well as for reactor applications. Significant advances in nuclear experimental techniques in the past two decades have led to a wealth of new measurements that remain to be incorporated in the databases. We report on a coordinated effort to compile and evaluate all the available beta-Delayed Neutron emission data. The different measurement techniques have been assessed and the data have been compared with semi-microscopic and microscopic-macroscopic models. The new microscopic database has been tested against aggregate total Delayed Neutron yields, time-dependent group parameters in 6-and 8-group re-presentation, and aggregate Delayed Neutron spectra. New recommendations of macroscopic Delayed-Neutron data for fissile materials of interest to applications are also presented. The new Reference Database for Beta-Delayed Neutron Emission Data is available online at: this http URL.
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compilation and evaluation of beta Delayed Neutron emission probabilities and half lives for z 28 precursors
Nuclear Data Sheets, 2020Co-Authors: J Liang, I Dillmann, Bhupinder Singh, M Birch, E A Mccutchan, A A Sonzogni, X Huang, M Kang, J WangAbstract:Abstract We present a compilation and evaluation of experimental β-Delayed Neutron emission probabilities (Pn) and half-lives (T1/2) for known or potential β-Delayed Neutron precursors with atomic number Z > 28 (73Cu–233Fr). This article includes the recommended values of both of these quantities, together with a compilation of experimental measurements when available. Some notable cases, as well as proposed standards for β-Delayed Neutron measurements are also discussed. Evaluated data has also been compared to systematics using three different approaches. The literature cut-off date for this work is August 15, 2020.
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evaluation of beta Delayed Neutron emission probabilities and half lives for z 2 28
Nuclear Data Sheets, 2015Co-Authors: M Birch, I Dillmann, Bhupinder Singh, D Abriola, T D Johnson, E A Mccutchan, A A SonzogniAbstract:Abstract We present an evaluation and compilation of β -Delayed Neutron probabilities and half-lives for nuclei in the region Z = 2–28 ( 8 He– 80 Ni). This article includes the recommended values of these quantities as well as a compiled list of experimental measurements for each nucleus in the region for which β -Delayed Neutron emission is possible. The literature cut-off for this work is August 15 th , 2015. Some notable cases as well as new standards for β -Delayed Neutron measurements in this mass region are also discussed.