Electra D. Poulopoulou, D. Mitrakos, N. Petropoulos
This work attempts a compilation on the performance and evolution indicators for today's (2020) operating nuclear power reactors. Data were obtained from IAEA's Power Reactor Information System (PRIS) Database, transferred to spreadsheets, post-processed, plotted in cognitive graphs and interpreted appropriately. The aim was to identify past, present and possibly future trends related to the usage of nuclear power for electricity production. The examined time span covers mainly currently operating power reactors, which have been grid connected since the '70s. Several operational periods could be identified, each one with its own properties and characteristics: (a) pre Three-Mile-Island, (b) post Three-Mile-Island, (c) post Chernobyl, (d) post Fukushima and, (e) New Build. These periods are loosely connected to the reactor generations as released and installed, i.e. Gen-II, Gen-III and Gen-III+. Although discussed as early as in the late '90s, Gen-IV reactors have not yet been developed. The New Build period involves mainly Gen-III+ types, the proposed Small Modular Reactors (SMR) and, recently, Mini Modular Reactors (MMR). Overall, these indicators point out that: (i) there is no negative trend on the number of active power reactors, (ii) the annual electricity produced by nuclear sources is steadily increasing, (iii) the reactors performance is getting better, (iv) despite their negligible number, the reactor accidents have been the main factors, which prohibited the expansion of nuclear reactors for electricity production, (v) all such accidents were followed by a period of conservative usage of most reactors, and, (vi) there is long-term improvement of the average reactor operational characteristics.
{"title":"Review of technical-economic trends for currently operating nuclear power reactors","authors":"Electra D. Poulopoulou, D. Mitrakos, N. Petropoulos","doi":"10.12681/hnps.3615","DOIUrl":"https://doi.org/10.12681/hnps.3615","url":null,"abstract":"This work attempts a compilation on the performance and evolution indicators for today's (2020) operating nuclear power reactors. Data were obtained from IAEA's Power Reactor Information System (PRIS) Database, transferred to spreadsheets, post-processed, plotted in cognitive graphs and interpreted appropriately. The aim was to identify past, present and possibly future trends related to the usage of nuclear power for electricity production. The examined time span covers mainly currently operating power reactors, which have been grid connected since the '70s. Several operational periods could be identified, each one with its own properties and characteristics: (a) pre Three-Mile-Island, (b) post Three-Mile-Island, (c) post Chernobyl, (d) post Fukushima and, (e) New Build. These periods are loosely connected to the reactor generations as released and installed, i.e. Gen-II, Gen-III and Gen-III+. Although discussed as early as in the late '90s, Gen-IV reactors have not yet been developed. The New Build period involves mainly Gen-III+ types, the proposed Small Modular Reactors (SMR) and, recently, Mini Modular Reactors (MMR). Overall, these indicators point out that: (i) there is no negative trend on the number of active power reactors, (ii) the annual electricity produced by nuclear sources is steadily increasing, (iii) the reactors performance is getting better, (iv) despite their negligible number, the reactor accidents have been the main factors, which prohibited the expansion of nuclear reactors for electricity production, (v) all such accidents were followed by a period of conservative usage of most reactors, and, (vi) there is long-term improvement of the average reactor operational characteristics.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"4 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":"130771780","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}
While nuclear data play an important role in nuclear physics applications, it has become important to have a better understanding of the data and try to minimize the uncertainties. In particular, there is a need for precision neutron-induced fission cross section measurements on fissile nuclei. Neutron-induced fission cross sections are typically measured as ratios, with a well-known standard in the denominator. While the 235U(n,f) reaction is a well measured standard, some light particle reactions are also well-known and their use as reference can provide information to remove shared systematic uncertainties that are present in an actinide-only ratio. A recent measurement of the 235U(n,f) reaction using as a reference the standard 6Li(n,t) reaction, was conducted at the Los Alamos Neutron Science Center using the NIFFTE collaboration’s fission time projection chamber (fissionTPC). The fissionTPC is a 2×2π charged particle tracker designed for measuring neutron-induced fission. Detailed 3D track reconstruction of the reaction products enables evaluation of systematic effects and corresponding uncertainties which are less directly accessible by other measurement techniques. This work focuses on the analysis for the event identification of the 6Li(n,t)α reaction in the fissionTPC.
{"title":"6Li(n,t)α reaction event-identification for the 235U(n,f)/6Li(n,t) cross section ratio measurement in the NIFFTE fissionTPC","authors":"M. Anastasiou","doi":"10.12681/hnps.3567","DOIUrl":"https://doi.org/10.12681/hnps.3567","url":null,"abstract":"While nuclear data play an important role in nuclear physics applications, it has become important to have a better understanding of the data and try to minimize the uncertainties. In particular, there is a need for precision neutron-induced fission cross section measurements on fissile nuclei. Neutron-induced fission cross sections are typically measured as ratios, with a well-known standard in the denominator. While the 235U(n,f) reaction is a well measured standard, some light particle reactions are also well-known and their use as reference can provide information to remove shared systematic uncertainties that are present in an actinide-only ratio. A recent measurement of the 235U(n,f) reaction using as a reference the standard 6Li(n,t) reaction, was conducted at the Los Alamos Neutron Science Center using the NIFFTE collaboration’s fission time projection chamber (fissionTPC). The fissionTPC is a 2×2π charged particle tracker designed for measuring neutron-induced fission. Detailed 3D track reconstruction of the reaction products enables evaluation of systematic effects and corresponding uncertainties which are less directly accessible by other measurement techniques. This work focuses on the analysis for the event identification of the 6Li(n,t)α reaction in the fissionTPC.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"104 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":"115445111","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 aim of the present work was to study the cross-section of the (n,2n) reaction on 203Tl, by irradiating a natural TlCl pellet target with monoenergetic neutron beam at 18.9 MeV. The cross section of the 203Tl(n,2n)202Tl reaction, was measured implementing the activation method, with respect to the 197Au(n,2n)196Au and 27Al(n,α)24Na reference reactions. The monoenergetic neutron beam was produced in the 5.5 MV Tandem accelerator of NCSR Demokritos, using the 3H(d,n)4He reaction. After the irradiation, the induced activity of the samples was measured with a HPGe detector, which was properly shielded with lead blocks to reduce the contribution of natural radioactivity. Monte Carlo simulations implementing the MCNP code have been performed to take into account the gamma-ray self-absorption results as well as the estimation of the neutron flux through the reference foils. Finally, a comparison of theoretical calculations with the code EMPIRE and experimental data was carried out, with the aim of finding a suitable model for the description of the reaction cross section under study.
{"title":"Activation Cross Section Measurement of the (n,2n) Reaction on 203Tl","authors":"Stavros Patas","doi":"10.12681/hnps.3713","DOIUrl":"https://doi.org/10.12681/hnps.3713","url":null,"abstract":"The aim of the present work was to study the cross-section of the (n,2n) reaction on 203Tl, by irradiating a natural TlCl pellet target with monoenergetic neutron beam at 18.9 MeV. The cross section of the 203Tl(n,2n)202Tl reaction, was measured implementing the activation method, with respect to the 197Au(n,2n)196Au and 27Al(n,α)24Na reference reactions. The monoenergetic neutron beam was produced in the 5.5 MV Tandem accelerator of NCSR Demokritos, using the 3H(d,n)4He reaction. After the irradiation, the induced activity of the samples was measured with a HPGe detector, which was properly shielded with lead blocks to reduce the contribution of natural radioactivity. Monte Carlo simulations implementing the MCNP code have been performed to take into account the gamma-ray self-absorption results as well as the estimation of the neutron flux through the reference foils. Finally, a comparison of theoretical calculations with the code EMPIRE and experimental data was carried out, with the aim of finding a suitable model for the description of the reaction cross section under study.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"22 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":"122508270","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}
M. Savva, T. Vasilopoulou, C. Nobs, L. Packer, I. Stamatelatos
Compton Suppressed Spectrometry (CSS) provides a method to improve the peak-to-background ratio, and consequently counting statistics and the limit of detection. The NCSRD Fusion Technology Group CSS system consists of a NaI detector coupled to a 40% HPGe. The NaI detector consists of an annulus, surrounding the HPGe, and a plug, which can be removed for sample positioning, offering a 4π detection geometry. The signal processing chain of the configuration allows for the simultaneous collection of both the suppressed and the unsuppressed spectra. The simultaneous collection of suppressed and unsuppressed spectra allows the analyst to use the optimum spectrum, depending on the radionuclide to be determined. In this work, the performance of the CSS system in the analysis of dosimetry foils of different material samples irradiated at the Joint European Torus (JET) during the 2019 DD campaign is presented. The Compton continuum was significantly reduced providing better peak identification for peaks of non-cascade nuclides. The developed methodology will be applied to study the activation characteristics of materials to be used in ITER components manufacturing, after irradiation at the significant 14 MeV neutron yield during the JET DT campaign.
{"title":"Compton Suppressed Gamma Spectrometry for activation analysis of materials irradiated at JET","authors":"M. Savva, T. Vasilopoulou, C. Nobs, L. Packer, I. Stamatelatos","doi":"10.12681/hnps.3599","DOIUrl":"https://doi.org/10.12681/hnps.3599","url":null,"abstract":"Compton Suppressed Spectrometry (CSS) provides a method to improve the peak-to-background ratio, and consequently counting statistics and the limit of detection. The NCSRD Fusion Technology Group CSS system consists of a NaI detector coupled to a 40% HPGe. The NaI detector consists of an annulus, surrounding the HPGe, and a plug, which can be removed for sample positioning, offering a 4π detection geometry. The signal processing chain of the configuration allows for the simultaneous collection of both the suppressed and the unsuppressed spectra. The simultaneous collection of suppressed and unsuppressed spectra allows the analyst to use the optimum spectrum, depending on the radionuclide to be determined. In this work, the performance of the CSS system in the analysis of dosimetry foils of different material samples irradiated at the Joint European Torus (JET) during the 2019 DD campaign is presented. The Compton continuum was significantly reduced providing better peak identification for peaks of non-cascade nuclides. The developed methodology will be applied to study the activation characteristics of materials to be used in ITER components manufacturing, after irradiation at the significant 14 MeV neutron yield during the JET DT campaign.","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":"129378813","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 Shell Model SU(3) symmetry was discovered by Elliott in 1958 and since then has been the algebraic realization of the Nuclear Shell Model. It is considered to be a fermionic nuclear model, since it tackles with the occupancies of the orbitals by nucleons. Elliott proved that the SU(3) symmetry appears in the LS (spin-orbit) coupling scheme of the nucleons. On the other side the Interacting Boson Model was proposed by Arima and Iachello in 1975 and it is a boson model. The bosons in the Interacting Boson Model are being derived by nucleon pairs. But the mapping (Otsuka-Arima-Iachello mapping) of the nucleon pairs into bosons is functional only in the jj coupling scheme and so it is applicable only in the U(5) and O(6) limits of the Interacting Boson Model. But what is the origin of the s and d bosons in the SU(3) limit of the Interacting Boson Model? Hereby I demonstrate that the s and d bosons are present into the spatial Shell Model SU(3) wave functions and that they derive from pairs of harmonic oscillator quanta.
{"title":"The s and d bosons into the Shell Model SU(3) wave functions","authors":"A. Martinou","doi":"10.12681/hnps.3595","DOIUrl":"https://doi.org/10.12681/hnps.3595","url":null,"abstract":"The Shell Model SU(3) symmetry was discovered by Elliott in 1958 and since then has been the algebraic realization of the Nuclear Shell Model. It is considered to be a fermionic nuclear model, since it tackles with the occupancies of the orbitals by nucleons. Elliott proved that the SU(3) symmetry appears in the LS (spin-orbit) coupling scheme of the nucleons. On the other side the Interacting Boson Model was proposed by Arima and Iachello in 1975 and it is a boson model. The bosons in the Interacting Boson Model are being derived by nucleon pairs. But the mapping (Otsuka-Arima-Iachello mapping) of the nucleon pairs into bosons is functional only in the jj coupling scheme and so it is applicable only in the U(5) and O(6) limits of the Interacting Boson Model. But what is the origin of the s and d bosons in the SU(3) limit of the Interacting Boson Model? Hereby I demonstrate that the s and d bosons are present into the spatial Shell Model SU(3) wave functions and that they derive from pairs of harmonic oscillator quanta.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"58 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":"125385535","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 KIDS framework for the nuclear equation of state (EoS) and energy density functional (EDF) offers the possibility to explore systematically the effect of EoS parameters on predictions for a variety of observables. The EoS parameters can be varied independently of each other and independently of assumptions regarding the in-medium nucleon effective mass. Here I present a pilot study of the neutron skin thickness (NST) in nuclei of current interest. The results indicate that variations of the symmetry energy slope parameter L by roughly 10 MeV and variations of the droplet-model counterpart of the curvature parameter Kτ by roughly 20 MeV affect predictions by comparable amounts. However, structural details may also have sizable effects on predictions, notably in the cases of 68Ni and 208Pb. This work is part of a systematic investigation of the NST within the KIDS framework and of a broader effort to constrain the density dependence of the nuclear symmetry energy.
{"title":"Density dependence of the nuclear symmetry energy and neutron skin thickness in the KIDS framework","authors":"P. Papakonstantinou","doi":"10.12681/hnps.3602","DOIUrl":"https://doi.org/10.12681/hnps.3602","url":null,"abstract":"The KIDS framework for the nuclear equation of state (EoS) and energy density functional (EDF) offers the possibility to explore systematically the effect of EoS parameters on predictions for a variety of observables. The EoS parameters can be varied independently of each other and independently of assumptions regarding the in-medium nucleon effective mass. Here I present a pilot study of the neutron skin thickness (NST) in nuclei of current interest. The results indicate that variations of the symmetry energy slope parameter L by roughly 10 MeV and variations of the droplet-model counterpart of the curvature parameter Kτ by roughly 20 MeV affect predictions by comparable amounts. However, structural details may also have sizable effects on predictions, notably in the cases of 68Ni and 208Pb. This work is part of a systematic investigation of the NST within the KIDS framework and of a broader effort to constrain the density dependence of the nuclear symmetry energy.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126488030","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}
P. Papakonstantinou, E. Mavrommatis, J. Wambach, V. Ponomarev
We have used a self-consistent Skyrme-HF plus Continuum RPA model to study the low-multipole response of stable and neutron/proton-rich Ni and Sn isotopes using suitable Skyrme parametrizations. Experimental studies of these nuclei are being planned at RIKEN. We focus on the momentum dependence of the strength distribution, as it may provide information on the structure of excited nuclear states.
{"title":"Multipole Response of Ni and Sn Isotopes and its Momentum Dependence","authors":"P. Papakonstantinou, E. Mavrommatis, J. Wambach, V. Ponomarev","doi":"10.12681/hnps.3350","DOIUrl":"https://doi.org/10.12681/hnps.3350","url":null,"abstract":"We have used a self-consistent Skyrme-HF plus Continuum RPA model to study the low-multipole response of stable and neutron/proton-rich Ni and Sn isotopes using suitable Skyrme parametrizations. Experimental studies of these nuclei are being planned at RIKEN. We focus on the momentum dependence of the strength distribution, as it may provide information on the structure of excited nuclear states.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126313500","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}
An extended Hauser-Feshbach approach has been employed in a multi-step Monte-Carlo evaporation code designed to study the de-excitation of highly excited compound nuclei. The code is intended to account for emission of light particles ($gamma$, n, $^{1,2,3}$H, $^{3-6}$He) and intermediate mass fragments in their ground and excited states (particle-bound or unbound). As a study case, we consider the decay of the compound nucleus $^{120}$Te$^*$ at excitation energy 100, 200 and 300 MeV. First chance decay widths are compared with treatments based on the Weisskopf and the s-wave approximation. Preliminary calculations are compared with experimental isotopic yields of intermediate mass fragments emitted in E/A = 50 MeV $^{4}$He + $^{116,124}$Sn $rightarrow$ $^{120,128}$Te$^*$ reactions.
采用扩展的Hauser-Feshbach方法，设计了一个多步蒙特卡罗蒸发程序，用于研究高激发复合核的去激发。该代码旨在解释轻粒子($gamma$, n, $^{1,2,3}$ H, $^{3-6}$ He)和处于基态和激发态(粒子束缚或未束缚)的中间质量碎片的发射。作为研究案例，我们考虑了激发能为100、200和300 MeV的复合核$^{120}$ Te $^*$的衰变。第一次机会衰减宽度与基于Weisskopf近似和s波近似的处理进行了比较。初步计算结果与E/A = 50 MeV $^{4}$ He + $^{116,124}$ Sn $rightarrow$$^{120,128}$ Te $^*$反应中发射的中等质量碎片的实验同位素产率进行了比较。
{"title":"Development of a Monte-Carlo Evaporation Code for Multiple-Fragment Emission","authors":"N. Nicolis","doi":"10.12681/hnps.3353","DOIUrl":"https://doi.org/10.12681/hnps.3353","url":null,"abstract":"An extended Hauser-Feshbach approach has been employed in a multi-step Monte-Carlo evaporation code designed to study the de-excitation of highly excited compound nuclei. The code is intended to account for emission of light particles ($gamma$, n, $^{1,2,3}$H, $^{3-6}$He) and intermediate mass fragments in their ground and excited states (particle-bound or unbound). As a study case, we consider the decay of the compound nucleus $^{120}$Te$^*$ at excitation energy 100, 200 and 300 MeV. First chance decay widths are compared with treatments based on the Weisskopf and the s-wave approximation. Preliminary calculations are compared with experimental isotopic yields of intermediate mass fragments emitted in E/A = 50 MeV $^{4}$He + $^{116,124}$Sn $rightarrow$ $^{120,128}$Te$^*$ reactions.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"250 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116047147","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}
D. Bonatsos, D. Lenis, N. Minkov, P. Raychev, P. Terziev
The E(5) symmetry describes nuclei related to the U(5)--SO(6) phase transition, while the X(5) symmetry is related to the U(5)--SU(3) phase transition. A chain of potentials interpolating between the U(5) symmetry of the 5-dimensional harmonic oscillator and the E(5) symmetry is considered. Parameter independent predictions for the spectra and B(E2) values of nuclei with $R_4= E(4)/E(2)$ ratios 2.093, 2.135, and 2.157 (compared to the ratio 2.00 of the U(5) case and the ratio 2.20 of the E(5) case) are derived numerically and compared to existing experimental data, suggesting several new experiments. Furthermore, an exactly soluble model with $R_4 = 2.646$ is constructed and a chain of potentials interpolating between this new model and the X(5) symmetry is considered. Parameter independent predictions for the spectra and B(E2) values of nuclei with $R_4$ ratios 2.769, 2.824 and 2.852 (compared to the ratio 2.904 of the X(5) case) are derived numerically and compared to existing experimental data, suggesting several new experiments.
{"title":"Parameter-Independent Symmetries in Nuclear Structure","authors":"D. Bonatsos, D. Lenis, N. Minkov, P. Raychev, P. Terziev","doi":"10.12681/hnps.3344","DOIUrl":"https://doi.org/10.12681/hnps.3344","url":null,"abstract":"The E(5) symmetry describes nuclei related to the U(5)--SO(6) phase transition, while the X(5) symmetry is related to the U(5)--SU(3) phase transition. A chain of potentials interpolating between the U(5) symmetry of the 5-dimensional harmonic oscillator and the E(5) symmetry is considered. Parameter independent predictions for the spectra and B(E2) values of nuclei with $R_4= E(4)/E(2)$ ratios 2.093, 2.135, and 2.157 (compared to the ratio 2.00 of the U(5) case and the ratio 2.20 of the E(5) case) are derived numerically and compared to existing experimental data, suggesting several new experiments. Furthermore, an exactly soluble model with $R_4 = 2.646$ is constructed and a chain of potentials interpolating between this new model and the X(5) symmetry is considered. Parameter independent predictions for the spectra and B(E2) values of nuclei with $R_4$ ratios 2.769, 2.824 and 2.852 (compared to the ratio 2.904 of the X(5) case) are derived numerically and compared to existing experimental data, suggesting several new experiments.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127900807","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}
{"title":"Medical Applications of Nuclear physics at the School of Medicine of the University of Ioannina (in greek)","authors":"Τζων Καλέφ-Εζρά","doi":"10.12681/hnps.3349","DOIUrl":"https://doi.org/10.12681/hnps.3349","url":null,"abstract":"<jats:p>N/A</jats:p>","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121149051","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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