O. Fasoula, G. Souliotis, S. Koulouris, Konstantina Palli, M. Veselský, S. Yenello, A. Bonasera
This paper presents our recent studies of the multinucleon transfer in peripheral collisions in reactions near the Fermi regime. Specifically, the reactions of a 86Kr beam at 15 MeV/nucleon with targets of 124Sn ,112Sn, 64Ni and 58Ni and reactions of a 86Kr beam at 25 MeV/nucleon with targets of 124Sn and 112Sn. The experimental data were obtained from the previous work of our group with the MARS spectrometer at the Cyclotron Institute of Texas A&M University. Our current focus is the thorough study of the experimental mass and momentum distributions of the projectile-like fragments. The momentum distributions are characterised by a narrow quasi-elastic peak and a broader deep-inelastic peak. We employed two-body kinematics to characterize the excitation energies of these reactions. We also compared the data with model calculations. The dynamical stage is described with either the Deep-Inelastic Transfer Model (DIT), or with the microscopic Constrained Molecular Dynamics model (CoMD). The de-excitation of the hot projectile-like fragments is performed with the Gemini model. Studying these reactions will provide us with a better understanding as to how the energy of the beam and the different targets affect the mechanism of the multinucleon transfer reactions. With the recent work, our continued efforts in the study of peripheral reactions in the Fermi energy regime delineate new opportunities to elucidate the reaction mechanism(s) of rare isotope production and may effectively contribute to the study of unexplored regions of the nuclear chart toward the r-process and the neutron drip line.
{"title":"Study of Multinucleon Transfer Mechanisms in 86Kr-Induced Peripheral Reactions at 15 and 25 MeV/nucleon","authors":"O. Fasoula, G. Souliotis, S. Koulouris, Konstantina Palli, M. Veselský, S. Yenello, A. Bonasera","doi":"10.12681/hnps.3572","DOIUrl":"https://doi.org/10.12681/hnps.3572","url":null,"abstract":"This paper presents our recent studies of the multinucleon transfer in peripheral collisions in reactions near the Fermi regime. Specifically, the reactions of a 86Kr beam at 15 MeV/nucleon with targets of 124Sn ,112Sn, 64Ni and 58Ni and reactions of a 86Kr beam at 25 MeV/nucleon with targets of 124Sn and 112Sn. The experimental data were obtained from the previous work of our group with the MARS spectrometer at the Cyclotron Institute of Texas A&M University. Our current focus is the thorough study of the experimental mass and momentum distributions of the projectile-like fragments. The momentum distributions are characterised by a narrow quasi-elastic peak and a broader deep-inelastic peak. We employed two-body kinematics to characterize the excitation energies of these reactions. We also compared the data with model calculations. The dynamical stage is described with either the Deep-Inelastic Transfer Model (DIT), or with the microscopic Constrained Molecular Dynamics model (CoMD). The de-excitation of the hot projectile-like fragments is performed with the Gemini model. Studying these reactions will provide us with a better understanding as to how the energy of the beam and the different targets affect the mechanism of the multinucleon transfer reactions. With the recent work, our continued efforts in the study of peripheral reactions in the Fermi energy regime delineate new opportunities to elucidate the reaction mechanism(s) of rare isotope production and may effectively contribute to the study of unexplored regions of the nuclear chart toward the r-process and the neutron drip line.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122125049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Depastas, G. Souliotis, Konstantina Palli, A. Bonasera, Hua Zheng
The Constrained Molecular Dynamics (CoMD) model is used to describe the collective motion of various nuclear systems. A CoMD-inspired phenomenology for the GDR is developed. In addition, the dependence of the GDR upon the effective interaction parameters is studied. Furthermore, both the monopole and dipole main and soft modes of 68Ni are reliably reproduced. We conclude that a hard EoS with K=308 MeV increases the GDR energy, without altering the GMR energy. Thus, this EoS gives rather consistent results in both the monopole and dipole giant resonances.
{"title":"The Giant Monopole and Dipole Resonances within the Constrained Molecular Dynamics (CoMD) Framework","authors":"T. Depastas, G. Souliotis, Konstantina Palli, A. Bonasera, Hua Zheng","doi":"10.12681/hnps.3577","DOIUrl":"https://doi.org/10.12681/hnps.3577","url":null,"abstract":"The Constrained Molecular Dynamics (CoMD) model is used to describe the collective motion of various nuclear systems. A CoMD-inspired phenomenology for the GDR is developed. In addition, the dependence of the GDR upon the effective interaction parameters is studied. Furthermore, both the monopole and dipole main and soft modes of 68Ni are reliably reproduced. We conclude that a hard EoS with K=308 MeV increases the GDR energy, without altering the GMR energy. Thus, this EoS gives rather consistent results in both the monopole and dipole giant resonances.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130907819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Goula, N. Patronis, M. Stamati, S. Chasapoglou, M. Diakaki, N. Colonna, Z. Eleme, E. Georgali, M. Kokkoris, A. Mengoni, V. Michalopoulou, M. Peoviti, R. Vlastou
The n_TOF facility at CERN is a neutron Time-Of-Flight facility based on a spallation neutron source. During the Second Long Shutdown (LS2) , a new experimental zone was designed and delivered. This new experimental area -the NEAR station - is located very close to the lead spallation target, at a distance of just ~3m. In this way, the high luminosity of the n_TOF neutron spallation source can be fully exploited. Towards the characterization of the new experimental area as well for the benchmarking of the performed simulations, the multi-foil activation measurement will be implemented. Eleven threshold and seven capture reference reactions will be utilized for the unfolding of the NEAR neutron beam energy spectrum that stretches from the meV to the GeV region.
{"title":"NEAR at n_TOF/CERN: Preparing the first multi-foil activation measurement","authors":"S. Goula, N. Patronis, M. Stamati, S. Chasapoglou, M. Diakaki, N. Colonna, Z. Eleme, E. Georgali, M. Kokkoris, A. Mengoni, V. Michalopoulou, M. Peoviti, R. Vlastou","doi":"10.12681/hnps.3611","DOIUrl":"https://doi.org/10.12681/hnps.3611","url":null,"abstract":"The n_TOF facility at CERN is a neutron Time-Of-Flight facility based on a spallation neutron source. During the Second Long Shutdown (LS2) , a new experimental zone was designed and delivered. This new experimental area -the NEAR station - is located very close to the lead spallation target, at a distance of just ~3m. In this way, the high luminosity of the n_TOF neutron spallation source can be fully exploited. Towards the characterization of the new experimental area as well for the benchmarking of the performed simulations, the multi-foil activation measurement will be implemented. Eleven threshold and seven capture reference reactions will be utilized for the unfolding of the NEAR neutron beam energy spectrum that stretches from the meV to the GeV region.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128713605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ioannis Alafogiannis, F. Tugnoli, Iason Mitsios, M. Anagnostakis
In γ-spectroscopy applications, one of the main effects that needs to be considered is the self absorption of the photons – especially of low energy – within the photon source, which may be significantly different between the calibration standard and the sample analyzed. This effect is highly dependent on material composition and density and sample thickness. A common way of dealing with the self-absorption issue is by using Efficiency Correction Factors (ECF), to take into consideration the different absorbing properties between the calibration standard and the sample. This work presents the on-going development of a MATLAB code for ECF calculation. The code calculates ECF for a variety of material matrices and compositions, focusing on Naturally Occurring Radioactive Materials (NORM), which may have high density and contain high Z elements. The results of the code were compared with other methods of ECF calculation, such as Monte-Carlo simulation.
{"title":"Development of a computer code for the calculation of self-absorption correction factors in γ-spectrometry applications","authors":"Ioannis Alafogiannis, F. Tugnoli, Iason Mitsios, M. Anagnostakis","doi":"10.12681/hnps.3607","DOIUrl":"https://doi.org/10.12681/hnps.3607","url":null,"abstract":"In γ-spectroscopy applications, one of the main effects that needs to be considered is the self absorption of the photons – especially of low energy – within the photon source, which may be significantly different between the calibration standard and the sample analyzed. This effect is highly dependent on material composition and density and sample thickness. A common way of dealing with the self-absorption issue is by using Efficiency Correction Factors (ECF), to take into consideration the different absorbing properties between the calibration standard and the sample. This work presents the on-going development of a MATLAB code for ECF calculation. The code calculates ECF for a variety of material matrices and compositions, focusing on Naturally Occurring Radioactive Materials (NORM), which may have high density and contain high Z elements. The results of the code were compared with other methods of ECF calculation, such as Monte-Carlo simulation.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"08 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127275799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Theofanis Tsakiris, M. Kokkoris, F. Maragkos, A. Ziagkova, N. Dimitrakopoulos, M. Krmpotić, D. Cosic, G. Provatas, A. Lagoyannis
The implementation of boron in several fields, such as in the creation of p-type semiconductors in electronics, has created the need for the accurate quantitative determination of its depth profile concentrations in near surface layers of various matrices. In the framework of IBA techniques a combination of Elastic Backscattering Spectroscopy, along with Nuclear Reaction Analysis, has been proposed in order to address the current needs for boron depth profiling, focusing on the use of proton beams. Deuteron beams however offer superior mass resolution with similar stopping power values and simultaneous excitation of most light elements. Unfortunately, the lack of experimental datasets concerning the deuteron elastic scattering on boron impedes their use. Thus, in the present work, the first set of measurements for the 11B(d,d0) differential cross section covering the Ed,lab=1300-1860 keV energy range for the backscattering angles of 150ο, 160ο and 170ο were carried out. The study was conducted at the 5.5 MV Tandem Accelerator of the Institute of Nuclear and Particle Physics, in the National Center of Scientific Research “Demokritos”, Athens, Greece. The target was a thin, self-supporting aluminum foil, upon which a thin natB (isotopic ratio: 11B 80.1%, 10B 19.9%) layer was deposited using the sputtering technique at RBI, Zagreb, Croatia, followed by the evaporation of an ultra-thin layer of 197Au on top for normalization and wear protection purposes. The outgoing particles were detected using silicon surface barrier (S.S.B.) detectors and the differential cross sections for elastic scattering were determined from the resulting spectra via the relative technique
{"title":"Study of the Elastic Scattering in the d + 11B system for EBS purposes","authors":"Theofanis Tsakiris, M. Kokkoris, F. Maragkos, A. Ziagkova, N. Dimitrakopoulos, M. Krmpotić, D. Cosic, G. Provatas, A. Lagoyannis","doi":"10.12681/hnps.3709","DOIUrl":"https://doi.org/10.12681/hnps.3709","url":null,"abstract":"The implementation of boron in several fields, such as in the creation of p-type semiconductors in electronics, has created the need for the accurate quantitative determination of its depth profile concentrations in near surface layers of various matrices. In the framework of IBA techniques a combination of Elastic Backscattering Spectroscopy, along with Nuclear Reaction Analysis, has been proposed in order to address the current needs for boron depth profiling, focusing on the use of proton beams. Deuteron beams however offer superior mass resolution with similar stopping power values and simultaneous excitation of most light elements. Unfortunately, the lack of experimental datasets concerning the deuteron elastic scattering on boron impedes their use. Thus, in the present work, the first set of measurements for the 11B(d,d0) differential cross section covering the Ed,lab=1300-1860 keV energy range for the backscattering angles of 150ο, 160ο and 170ο were carried out. The study was conducted at the 5.5 MV Tandem Accelerator of the Institute of Nuclear and Particle Physics, in the National Center of Scientific Research “Demokritos”, Athens, Greece. The target was a thin, self-supporting aluminum foil, upon which a thin natB (isotopic ratio: 11B 80.1%, 10B 19.9%) layer was deposited using the sputtering technique at RBI, Zagreb, Croatia, followed by the evaporation of an ultra-thin layer of 197Au on top for normalization and wear protection purposes. The outgoing particles were detected using silicon surface barrier (S.S.B.) detectors and the differential cross sections for elastic scattering were determined from the resulting spectra via the relative technique","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124999180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Nicolis, Theodora-Ilektra Katsigianni, Kostantinos Korakas, Athanasia Miliadou, Diamantis Tasioudis
The production of spallation residues in 56Fe+p bombardments is described with empirical parametric formulas often used in cosmic-ray astrophysics, activation studies and isotope production for medical applications. Experimental observables including mass, charge and isotopic distributions are compared with calculations using two versions of the formulas of Rudstam and Silberberg-Tsao and the SPACS formula. For reference, a comparison is made with the predictions of a two-stage reaction model. Deviation factors obtained in these approaches are reported.
{"title":"Validation of Empirical Formulas for Spallation Residue Production in 0.3A-1.5A GeV 56Fe+p Reactions","authors":"N. Nicolis, Theodora-Ilektra Katsigianni, Kostantinos Korakas, Athanasia Miliadou, Diamantis Tasioudis","doi":"10.12681/hnps.3619","DOIUrl":"https://doi.org/10.12681/hnps.3619","url":null,"abstract":"The production of spallation residues in 56Fe+p bombardments is described with empirical parametric formulas often used in cosmic-ray astrophysics, activation studies and isotope production for medical applications. Experimental observables including mass, charge and isotopic distributions are compared with calculations using two versions of the formulas of Rudstam and Silberberg-Tsao and the SPACS formula. For reference, a comparison is made with the predictions of a two-stage reaction model. Deviation factors obtained in these approaches are reported.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115019776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The unitary limit refers to a scattering problem at infinite scattering length where a scattering state becomes bound. Such a limit is experimentally accessible in systems of cold atoms at the vicinity of Feshbach resonances. In nuclear physics, a physical manifestation of the unitary limit is of interest both from the experimental challenge to measure such a limit in nuclei and from the theoretical aspects that accompany that limit such as conformal symmetry, a quantum critical point and the BCS-BEC crossover. In this talk the application of a symmetry-based approach to the unitary limit in collective states of heavy, even-even nuclei is presented that is performed by means of the Interacting Boson Model of nuclear structure in conjunction with the Feshbach formalism of nuclear reactions. The results of this application start from the determination of what is to be measured in the experiment for the examination of the unitary limit in collective nuclear states. That is the fluctuations of the cross-section of the A+2n compound nucleus. The primary theoretical result concerns the representations of conformal symmetry in A+2n compound nuclei via the fluctuations of cross sections.
{"title":"Unitary limit in heavy nuclei","authors":"P. Georgoudis","doi":"10.12681/hnps.3600","DOIUrl":"https://doi.org/10.12681/hnps.3600","url":null,"abstract":"The unitary limit refers to a scattering problem at infinite scattering length where a scattering state becomes bound. Such a limit is experimentally accessible in systems of cold atoms at the vicinity of Feshbach resonances. In nuclear physics, a physical manifestation of the unitary limit is of interest both from the experimental challenge to measure such a limit in nuclei and from the theoretical aspects that accompany that limit such as conformal symmetry, a quantum critical point and the BCS-BEC crossover. In this talk the application of a symmetry-based approach to the unitary limit in collective states of heavy, even-even nuclei is presented that is performed by means of the Interacting Boson Model of nuclear structure in conjunction with the Feshbach formalism of nuclear reactions. The results of this application start from the determination of what is to be measured in the experiment for the examination of the unitary limit in collective nuclear states. That is the fluctuations of the cross-section of the A+2n compound nucleus. The primary theoretical result concerns the representations of conformal symmetry in A+2n compound nuclei via the fluctuations of cross sections.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132159589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Z. Bari, S. Chasapoglou, A. Kalamara, T. Vasilopoulou, M. Axiotis, A. Lagoyannis, M. Kokkoris, R. Vlastou, I. Stamatelatos
Neutron Activation Analysis Prognosis and Optimization (NAAPRO) code was applied for the prognosis of the activation products, their activities, the number of counts recorded in the detector, the minimum detection limits as well as the gamma spectrum obtained in fast neutron activation analysis experiments. Simulations were performed for geological and biological reference materials irradiated with 14 MeV neutrons at the 5.5 MV NCSRD tandem accelerator facility. The results of the study demonstrated the fast neutron analytical capabilities of the accelerator and, moreover, allowed for the optimization of the FNAA parameters, while avoiding the performance of difficult and time-consuming experimental tests at the accelerator facility.
{"title":"Fast Neutron Activation Analysis at the NCSRD Tandem Accelerator facility: Prognosis and Optimization","authors":"Z. Bari, S. Chasapoglou, A. Kalamara, T. Vasilopoulou, M. Axiotis, A. Lagoyannis, M. Kokkoris, R. Vlastou, I. Stamatelatos","doi":"10.12681/hnps.4798","DOIUrl":"https://doi.org/10.12681/hnps.4798","url":null,"abstract":"Neutron Activation Analysis Prognosis and Optimization (NAAPRO) code was applied for the prognosis of the activation products, their activities, the number of counts recorded in the detector, the minimum detection limits as well as the gamma spectrum obtained in fast neutron activation analysis experiments. Simulations were performed for geological and biological reference materials irradiated with 14 MeV neutrons at the 5.5 MV NCSRD tandem accelerator facility. The results of the study demonstrated the fast neutron analytical capabilities of the accelerator and, moreover, allowed for the optimization of the FNAA parameters, while avoiding the performance of difficult and time-consuming experimental tests at the accelerator facility.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125143653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Koulouris, G. Souliotis, F. Cappuzzello, D. Carbone, A. Pakou, C. Agodi, G. Brischetto, S. Calabrese, M. Cavallaro, I. Ciraldo, O. Fasoula, J. Klimo, Konstantina Palli, O. Sgouros, V. Soukeras, A. Spatafora, D. Torresi, M. Veselský
The present work is focused on our efforts to produce and identify neutron-richrare isotopes from peripheral reactions below the Fermi energy. High-quality experimental data were obtained from a recent experiment with the MAGNEX spectrometer at INFN-LNS in Catania, Italy. The main goal of this effort is to describe the adopted identification techniques used to analyze the data from the reaction 70 Zn (15 MeV/nucleon) + 64 Ni. The particle identification procedure is based on a novel approach that involves the reconstruction of both the atomic number Z and the ionic charge q of the ions, followed by the identification of themass. Our method was successfully applied to identify neutron-rich ejectiles from multinucleon transfer in the above reaction 70 Zn + 64 Ni at 15 MeV/nucleon. The analysis of the data is ongoing. We expect to obtain the angular and momentum distributions of the fragments, along with their production cross sections. These data, along with comparisons with theoretical models are expected to contribute to a better understanding of the complex reaction mechanisms of multinucleon transfer that dominate this energy regime.
{"title":"Measurements of projectile fragments from 70 Zn (15 MeV/nucleon) + 64 Ni collisions with the MAGNEX spectrometer at INFN-LNS","authors":"S. Koulouris, G. Souliotis, F. Cappuzzello, D. Carbone, A. Pakou, C. Agodi, G. Brischetto, S. Calabrese, M. Cavallaro, I. Ciraldo, O. Fasoula, J. Klimo, Konstantina Palli, O. Sgouros, V. Soukeras, A. Spatafora, D. Torresi, M. Veselský","doi":"10.12681/hnps.3571","DOIUrl":"https://doi.org/10.12681/hnps.3571","url":null,"abstract":"The present work is focused on our efforts to produce and identify neutron-richrare isotopes from peripheral reactions below the Fermi energy. High-quality experimental data were obtained from a recent experiment with the MAGNEX spectrometer at INFN-LNS in Catania, Italy. The main goal of this effort is to describe the adopted identification techniques used to analyze the data from the reaction 70 Zn (15 MeV/nucleon) + 64 Ni. The particle identification procedure is based on a novel approach that involves the reconstruction of both the atomic number Z and the ionic charge q of the ions, followed by the identification of themass. Our method was successfully applied to identify neutron-rich ejectiles from multinucleon transfer in the above reaction 70 Zn + 64 Ni at 15 MeV/nucleon. The analysis of the data is ongoing. We expect to obtain the angular and momentum distributions of the fragments, along with their production cross sections. These data, along with comparisons with theoretical models are expected to contribute to a better understanding of the complex reaction mechanisms of multinucleon transfer that dominate this energy regime.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128936796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Stamatopoulos, P. Koehler, A. Couture, B. DiGiovine, G. Rusev, J. Ullmann
Direct (n,γ) measurements on radioactive nuclei can often be challenging. Substantial effort has been devoted to developing indirect techniques and perform measurements on short-lived radionuclides of astrophysical interest. A new indirect technique is being explored at the Los Alamos Neutron Science Center (LANSCE) which enables the calculation of average neuron capture properties from neutron transmission data. A station for neutron transmission, has been under commissioning during the last two years at LANSCE. The Device for Indirect Capture Experiments on Radionuclides (DICER) is currently capable of carrying out measurements on stable cylindrical samples with a diameter as small as 1 mm and mass as low as a few mg. The first year of operation indicate that the DICER instrument is ready to perform its first measurement on a radioactive sample (88Zr, t1/2=83.4 days) which is planned for the winter of 2021. A brief description of the apparatus and details on the latest DICER results will be presented.
{"title":"A new approach for indirect capture measurements: The DICER neutron transmission station at LANSCE","authors":"A. Stamatopoulos, P. Koehler, A. Couture, B. DiGiovine, G. Rusev, J. Ullmann","doi":"10.12681/hnps.4796","DOIUrl":"https://doi.org/10.12681/hnps.4796","url":null,"abstract":"Direct (n,γ) measurements on radioactive nuclei can often be challenging. Substantial effort has been devoted to developing indirect techniques and perform measurements on short-lived radionuclides of astrophysical interest. A new indirect technique is being explored at the Los Alamos Neutron Science Center (LANSCE) which enables the calculation of average neuron capture properties from neutron transmission data. A station for neutron transmission, has been under commissioning during the last two years at LANSCE. The Device for Indirect Capture Experiments on Radionuclides (DICER) is currently capable of carrying out measurements on stable cylindrical samples with a diameter as small as 1 mm and mass as low as a few mg. The first year of operation indicate that the DICER instrument is ready to perform its first measurement on a radioactive sample (88Zr, t1/2=83.4 days) which is planned for the winter of 2021. A brief description of the apparatus and details on the latest DICER results will be presented.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123329198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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