Pub Date : 2023-03-27DOI: 10.1088/1361-6471/acc7bc
N. Dhillon, Rajat Rana, sucheta Duhan, S. Gautam, R. Puri
The onset of nuclear vaporization in heavy-ion collisions is examined in the present study. For this, we perform Quantum Molecular Dynamics (QMD) model calculations supplemented with clusterisation algorithm for fragment identification, namely Simulated Annealing Clusterization Algorithm (SACA) approach. Our results with much sophisticated SACA method show a nice agreement with experimental findings of vaporization (predicted by asymptotic behaviour of average fragment charge) in $^{16}$textrm{O} $+$ $^{80}$textrm{Br} and $^{16}$textrm{O} $+$ $^{10 7}$textrm{Ag} collisions. Further, we predicted the energy of onset of vaporization for $^{40}$textrm{Ca} $+$ $^{40}$textrm{Ca}, $^{84}$textrm{Kr} $+$ $^{84}$textrm{Kr}, $^{132}$textrm{Xe} $+$ $^{132}$textrm{Xe} and $^{197}$textrm{Au} $+$ $^{197}$textrm{Au} collisions by investigating gas/liquid content and probability of vaporization (and it's derivative) emph{vs} incident energy behaviour. These two observables probe the critical point of nuclear vaporization in much sophisticated manner, relative to average fragment charge. Our findings on these two novel variables to predict the energy of onset of vaporization are verifiable in experiments. The influence of colliding geometry as well as role of the Coulomb interactions is also studied to understand the system size effects on the nuclear vaporization.
{"title":"Probing onset of nuclear vaporization in heavy ion collisions","authors":"N. Dhillon, Rajat Rana, sucheta Duhan, S. Gautam, R. Puri","doi":"10.1088/1361-6471/acc7bc","DOIUrl":"https://doi.org/10.1088/1361-6471/acc7bc","url":null,"abstract":"\u0000 The onset of nuclear vaporization in heavy-ion collisions is examined in the present study. For this, we perform Quantum Molecular Dynamics (QMD) model calculations supplemented with clusterisation algorithm for fragment identification, namely Simulated Annealing Clusterization Algorithm (SACA) approach. Our results with much sophisticated SACA method show a nice agreement with experimental findings of vaporization (predicted by asymptotic behaviour of average fragment charge) in $^{16}$textrm{O} $+$ $^{80}$textrm{Br} and $^{16}$textrm{O} $+$ $^{10 7}$textrm{Ag} collisions. Further, we predicted the energy of onset of vaporization for $^{40}$textrm{Ca} $+$ $^{40}$textrm{Ca}, $^{84}$textrm{Kr} $+$ $^{84}$textrm{Kr}, $^{132}$textrm{Xe} $+$ $^{132}$textrm{Xe} and $^{197}$textrm{Au} $+$ $^{197}$textrm{Au} collisions by investigating gas/liquid content and probability of vaporization (and it's derivative) emph{vs} incident energy behaviour. These two observables probe the critical point of nuclear vaporization in much sophisticated manner, relative to average fragment charge. Our findings on these two novel variables to predict the energy of onset of vaporization are verifiable in experiments. The influence of colliding geometry as well as role of the Coulomb interactions is also studied to understand the system size effects on the nuclear vaporization.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46817291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-13DOI: 10.1088/1361-6471/acc3b4
M. Sepiani, Mehdi Nasri Nasrabadi
Nuclear level density (NLD) is calculated using the statistical partition function method for 58Ni. The microscopic recursive approach based on the realistic single particle levels schemes obtained from various nuclear potentials is used to remove various simplifying approximations and accurately determine the NLD. The effect of these approximations is determined by comparing the results of this method with the usual and common calculations of the Fermi gas model (FGM). It is shown that such a fully microscopic approach represents the NLD behavior according to the available experimental data.
{"title":"Determination of nuclear level density based on a fully microscopic statistical partition function method for 58Ni","authors":"M. Sepiani, Mehdi Nasri Nasrabadi","doi":"10.1088/1361-6471/acc3b4","DOIUrl":"https://doi.org/10.1088/1361-6471/acc3b4","url":null,"abstract":"\u0000 Nuclear level density (NLD) is calculated using the statistical partition function method for 58Ni. The microscopic recursive approach based on the realistic single particle levels schemes obtained from various nuclear potentials is used to remove various simplifying approximations and accurately determine the NLD. The effect of these approximations is determined by comparing the results of this method with the usual and common calculations of the Fermi gas model (FGM). It is shown that such a fully microscopic approach represents the NLD behavior according to the available experimental data.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45259688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-23DOI: 10.1088/1361-6471/acbe57
Juan Lopez Moraña, X. Viñas
In this work we want to study quasielastic (p, n) exchange reactions using a semi-microscopic optical model derived in a previous work [1] based on a nuclear matter approach where the real and imaginary parts are given by the first and second order terms, respectively, of the mass operator obtained by a Brueckner-Hartree-Fock calculation using a G-matrix built up with an effective Gogny interaction. The study of these quasielastic reactions is performed within a Distorted Wave Born Approximation (DWBA) to evaluate the wave functions in the entrance and exit channels, which in turn are used to compute the transition matrix elements. This model, which is free of adjustable parameters, provide a reasonable good agreement with the considered experimental data, namely differential cross sections, analyzing powers and total cross sections, of different reactions spanned along the periodic table at several energies.
{"title":"Quasielastic (p, n) reactions described by a microscopic optical model based on the Gogny force","authors":"Juan Lopez Moraña, X. Viñas","doi":"10.1088/1361-6471/acbe57","DOIUrl":"https://doi.org/10.1088/1361-6471/acbe57","url":null,"abstract":"\u0000 In this work we want to study quasielastic (p, n) exchange reactions using a semi-microscopic optical model derived in a previous work [1] based on a nuclear matter approach where the real and imaginary parts are given by the first and second order terms, respectively, of the mass operator obtained by a Brueckner-Hartree-Fock calculation using a G-matrix built up with an effective Gogny interaction. The study of these quasielastic reactions is performed within a Distorted Wave Born Approximation (DWBA) to evaluate the wave functions in the entrance and exit channels, which in turn are used to compute the transition matrix elements. This model, which is free of adjustable parameters, provide a reasonable good agreement with the considered experimental data, namely differential cross sections, analyzing powers and total cross sections, of different reactions spanned along the periodic table at several energies.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42901515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-23DOI: 10.1088/1361-6471/acbe56
Yueli Song, Fengqun Zhou, Shuqing Yuan, P. Ji, Xiaopeng Zhang, Yajuan Hao, Yong Li
For the problem of two or more nuclear reactions producing the same product nucleus in the actual cross section measurements of nuclear reactions, the method was given for subtracting the effect of interference reactions that produce same product nucleus on the cross-section measurements of the target nuclear reaction. The cross-section values were measured for the 183W(n,p)183Ta reaction at four different neutron energies from 13.5 to 14.8MeV by using the activation technique. In the process of the calculating cross-section data, the effects of the interference reactions 184W(n,d)183Ta and 184W(n,n+p)183Ta were subtracted by using the above method. At the same time the effect of the 186W(n,α)183Hf 183Ta process was also subtracted by using the previously developed method. Analysis and comparison shows that our experimental cross-section values for the 183W(n,p)183Ta reaction agrees with the previous results in the case of using the samples of enriched 183W at the close energies. Discrepancies in the previous cross-section data of the 183W(n,p)183Ta reaction were clarified and the recommendation excitation function curve for the 183W(n,p)183Ta reaction was given by adopting the nuclear theoretical model program system TALYS–1.95.
{"title":"Method to subtract the effect of interference reactions that produce same product nucleus on the cross-section measurements of the target nuclear reaction and the cross-section of the 183W(n,p)183Ta reaction around 14 MeV neutrons","authors":"Yueli Song, Fengqun Zhou, Shuqing Yuan, P. Ji, Xiaopeng Zhang, Yajuan Hao, Yong Li","doi":"10.1088/1361-6471/acbe56","DOIUrl":"https://doi.org/10.1088/1361-6471/acbe56","url":null,"abstract":"\u0000 For the problem of two or more nuclear reactions producing the same product nucleus in the actual cross section measurements of nuclear reactions, the method was given for subtracting the effect of interference reactions that produce same product nucleus on the cross-section measurements of the target nuclear reaction. The cross-section values were measured for the 183W(n,p)183Ta reaction at four different neutron energies from 13.5 to 14.8MeV by using the activation technique. In the process of the calculating cross-section data, the effects of the interference reactions 184W(n,d)183Ta and 184W(n,n+p)183Ta were subtracted by using the above method. At the same time the effect of the 186W(n,α)183Hf 183Ta process was also subtracted by using the previously developed method. Analysis and comparison shows that our experimental cross-section values for the 183W(n,p)183Ta reaction agrees with the previous results in the case of using the samples of enriched 183W at the close energies. Discrepancies in the previous cross-section data of the 183W(n,p)183Ta reaction were clarified and the recommendation excitation function curve for the 183W(n,p)183Ta reaction was given by adopting the nuclear theoretical model program system TALYS–1.95.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43633353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-23DOI: 10.1088/1361-6471/acbe59
D. Sharma, Suneel Kumar
Isospin quantum molecular dynamics (IQMD) model is a reliable computational tool for the study of various phenomena (multi fragmentation, anisotropic flow, nuclear stopping) from low to intermediate heavy ion collisions. Here, simulation has been carried out for the magnetic field generated during non-central heavy ion collisions using the IQMD model. The effect of various parameters, such as centrality, angular momentum, rapidity and incident energy has been thoroughly investigated on the magnetic field with the evolution of time and space. It has been observed that the rapidity bin significantly impacts the magnitude of the magnetic field in different directions. Furthermore, the magnetic field produced during heavy ion collision (HIC) leads to a notable impact on the in-plane momentum of the proton and neutron.
{"title":"PRODUCTION OF MAGNETIC FIELD DUE TO HEAVY ION COLLISIONS AROUND TRANSITION ENERGY","authors":"D. Sharma, Suneel Kumar","doi":"10.1088/1361-6471/acbe59","DOIUrl":"https://doi.org/10.1088/1361-6471/acbe59","url":null,"abstract":"\u0000 Isospin quantum molecular dynamics (IQMD) model is a reliable computational tool for the study of various phenomena (multi fragmentation, anisotropic flow, nuclear stopping) from low to intermediate heavy ion collisions. Here, simulation has been carried out for the magnetic field generated during non-central heavy ion collisions using the IQMD model. The effect of various parameters, such as centrality, angular momentum, rapidity and incident energy has been thoroughly investigated on the magnetic field with the evolution of time and space. It has been observed that the rapidity bin significantly impacts the magnitude of the magnetic field in different directions. Furthermore, the magnetic field produced during heavy ion collision (HIC) leads to a notable impact on the in-plane momentum of the proton and neutron.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45361595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-20DOI: 10.1088/1361-6471/accfb4
Z. Varga, Anett Mis'ak, R. V'ertesi
We investigated the production of charmed baryons with different isospin and strangeness content, compared to both charmed D0 mesons and to the Λc + baryon in proton--proton collisions at LHC energies. We used the PYTHIA 8 Monte Carlo event generator with color-reconnection beyond leading color approximation and proposed methods based on event-activity classifiers to probe the source of the charm baryon enhancement. We conclude that in the considered model class, the isospin of the charmed baryon state has a strong impact on the enhancement pattern. Using the observables we propose, upcoming high-precision experimental data will be able to differentiate between mechanisms of strangeness and charm enhancement.
{"title":"Event-activity dependent production of strange and non-strange charmed baryons in the enhanced color-reconnection scheme","authors":"Z. Varga, Anett Mis'ak, R. V'ertesi","doi":"10.1088/1361-6471/accfb4","DOIUrl":"https://doi.org/10.1088/1361-6471/accfb4","url":null,"abstract":"\u0000 We investigated the production of charmed baryons with different isospin and strangeness content, compared to both charmed D0 mesons and to the Λc\u0000 + baryon in proton--proton collisions at LHC energies. We used the PYTHIA 8 Monte Carlo event generator with color-reconnection beyond leading color approximation and proposed methods based on event-activity classifiers to probe the source of the charm baryon enhancement. We conclude that in the considered model class, the isospin of the charmed baryon state has a strong impact on the enhancement pattern. Using the observables we propose, upcoming high-precision experimental data will be able to differentiate between mechanisms of strangeness and charm enhancement.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49497767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-09DOI: 10.1088/1361-6471/acbaaf
C. M. Yeşilkanat, S. Akkoyun
With the fission barrier height information, the survival probabilities of super-heavy nuclei can also be reached. Therefore, it is important to have accurate knowledge of fission barriers, for example, the discovery of super-heavy nuclei in the stability island in the super-heavy nuclei region. In this study, five machine learning techniques, cubist model, random forest, support vector regression, extreme gradient boosting and artificial neural network were used to accurately predict the fission barriers of 330 even-even super-heavy nuclei in the region 140 ≤ N ≤ 216 with proton numbers between 92 and 120. The obtained results were compared both among themselves and with other theoretical model calculation estimates and experimental results. According to the results obtained, it was concluded that the cubist model, support vector regression and extreme gradient boosting methods generally gave better results and could be a better tool for estimating fission barrier heights.
{"title":"Estimation of fission barrier heights for even-even superheavy nuclei using machine learning approaches","authors":"C. M. Yeşilkanat, S. Akkoyun","doi":"10.1088/1361-6471/acbaaf","DOIUrl":"https://doi.org/10.1088/1361-6471/acbaaf","url":null,"abstract":"\u0000 With the fission barrier height information, the survival probabilities of super-heavy nuclei can also be reached. Therefore, it is important to have accurate knowledge of fission barriers, for example, the discovery of super-heavy nuclei in the stability island in the super-heavy nuclei region. In this study, five machine learning techniques, cubist model, random forest, support vector regression, extreme gradient boosting and artificial neural network were used to accurately predict the fission barriers of 330 even-even super-heavy nuclei in the region 140 ≤ N ≤ 216 with proton numbers between 92 and 120. The obtained results were compared both among themselves and with other theoretical model calculation estimates and experimental results. According to the results obtained, it was concluded that the cubist model, support vector regression and extreme gradient boosting methods generally gave better results and could be a better tool for estimating fission barrier heights.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45177552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-06DOI: 10.1088/1361-6471/acb960
Jie Liu, Z. Cui, Yi-Wei Hu, Haofan Bai, Yi Yang, X. Ruan, Cong Xia, Jin-xiang Chen, Guohui Zhang, Y. Gledenov, E. Sansarbayar, G. Khuukhenkhuu, L. Krupa, I. Chuprakov, Hanxiong Huang, Jie Ren, Q. Fan, Yuan Gao, Xiangjun Yang
Cross sections of the 63Cu(n, α)60Co reaction in the MeV neutron energy region were measured using both the direct measurement method and the activation method. A twin gridded ionization chamber (GIC) was used for the direct measurement while the high-purity germanium (HPGe) detector was used for the activation method. The measured cross sections using the two methods are consistent within measurement uncertainties. The present results support the evaluation data in the ENDF/B-VII.1 library instead of the latest evaluation data in the ENDF/B-VIII.0 library, which is helpful to clarify discrepancies in measurement and evaluation data. TALYS-1.9 code analysis was performed which shows that the measurement cross sections can be well reproduced with minor adjustment of the input parameters. Through the calculation, it is found that the compound mechanism predominates the 63Cu(n, α)60Co reaction with the ratios higher than 0.7 for neutron energy less than 20 MeV.
{"title":"63Cu(n, α)60Co cross sections in the MeV region","authors":"Jie Liu, Z. Cui, Yi-Wei Hu, Haofan Bai, Yi Yang, X. Ruan, Cong Xia, Jin-xiang Chen, Guohui Zhang, Y. Gledenov, E. Sansarbayar, G. Khuukhenkhuu, L. Krupa, I. Chuprakov, Hanxiong Huang, Jie Ren, Q. Fan, Yuan Gao, Xiangjun Yang","doi":"10.1088/1361-6471/acb960","DOIUrl":"https://doi.org/10.1088/1361-6471/acb960","url":null,"abstract":"\u0000 Cross sections of the 63Cu(n, α)60Co reaction in the MeV neutron energy region were measured using both the direct measurement method and the activation method. A twin gridded ionization chamber (GIC) was used for the direct measurement while the high-purity germanium (HPGe) detector was used for the activation method. The measured cross sections using the two methods are consistent within measurement uncertainties. The present results support the evaluation data in the ENDF/B-VII.1 library instead of the latest evaluation data in the ENDF/B-VIII.0 library, which is helpful to clarify discrepancies in measurement and evaluation data. TALYS-1.9 code analysis was performed which shows that the measurement cross sections can be well reproduced with minor adjustment of the input parameters. Through the calculation, it is found that the compound mechanism predominates the 63Cu(n, α)60Co reaction with the ratios higher than 0.7 for neutron energy less than 20 MeV.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46499971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-06DOI: 10.1088/1361-6471/acb961
J. Skowronski, R. M. Gesuè, A. Boeltzig, G. F. Ciani, D. Piatti, D. Rapagnani, M. Aliotta, C. Ananna, F. Barile, D. Bemmerer, A. Best, C. Broggini, C. Bruno, A. Caciolli, M. Campostrini, F. Cavanna, P. Colombetti, A. Compagnucci, P. Corvisiero, L. Csedreki, T. Davinson, R. Depalo, A. Di Leva, Z. Elekes, F. Ferraro, A. Formicola, Z. Fulop, G. Gervino, A. Guglielmetti, C. Gustavino, G. Gyurky, G. Imbriani, M. Junker, M. Lugaro, P. Marigo, E. Masha, R. Menegazzo, V. Paticchio, R. Perrino, P. Prati, V. Rigato, L. Schiavulli, R. S. Sidhu, O. Straniero, T. Szücs, S. Zavatarelli
Studies of charged-particle reactions for low-energy nuclear astrophysics require high sensitivity, which can be achieved by means of detection setups with high efficiency and low backgrounds, to obtain precise measurements in the energy region of interest for stellar scenarios. High-efficiency total absorption spectroscopy is an established and powerful tool for studying radiative capture reactions, particularly if combined with the cosmic background reduction by several orders of magnitude obtained at the Laboratory for Underground Nuclear Astrophysics (LUNA). We present recent improvements in the detection setup with the Bismuth Germanium Oxide (BGO) detector at LUNA, aiming to reduce high-energy backgrounds and to increase the summing detection efficiency. The new design results in enhanced sensitivity of the BGO setup, as we demonstrate and discuss in the context of the first direct measurement of the 65 keV resonance (Ex = 5672 keV) of the 17O(p,gamma)18F reaction. Moreover, we show two applications of the BGO detector, which exploit its segmentation. In case of complex gamma-ray cascades, e.g. the de-excitation of Ex = 5672 keV in 18F, the BGO segmentation allows to identify and suppress the beam-induced background signals that mimic the sum peak of interest. We demonstrate another new application for such a detector in form of in-site activation measurements of a reaction with beta+ unstable product nuclei, e.g., the 14N(p,gamma)15O reaction.
{"title":"Advances in radiative capture studies at LUNA with a segmented BGO detector","authors":"J. Skowronski, R. M. Gesuè, A. Boeltzig, G. F. Ciani, D. Piatti, D. Rapagnani, M. Aliotta, C. Ananna, F. Barile, D. Bemmerer, A. Best, C. Broggini, C. Bruno, A. Caciolli, M. Campostrini, F. Cavanna, P. Colombetti, A. Compagnucci, P. Corvisiero, L. Csedreki, T. Davinson, R. Depalo, A. Di Leva, Z. Elekes, F. Ferraro, A. Formicola, Z. Fulop, G. Gervino, A. Guglielmetti, C. Gustavino, G. Gyurky, G. Imbriani, M. Junker, M. Lugaro, P. Marigo, E. Masha, R. Menegazzo, V. Paticchio, R. Perrino, P. Prati, V. Rigato, L. Schiavulli, R. S. Sidhu, O. Straniero, T. Szücs, S. Zavatarelli","doi":"10.1088/1361-6471/acb961","DOIUrl":"https://doi.org/10.1088/1361-6471/acb961","url":null,"abstract":"\u0000 Studies of charged-particle reactions for low-energy nuclear astrophysics require high sensitivity, which can be achieved by means of detection setups with high efficiency and low backgrounds, to obtain precise measurements in the energy region of interest for stellar scenarios. High-efficiency total absorption spectroscopy is an established and powerful tool for studying radiative capture reactions, particularly if combined with the cosmic background reduction by several orders of magnitude obtained at the Laboratory for Underground Nuclear Astrophysics (LUNA). We present recent improvements in the detection setup with the Bismuth Germanium Oxide (BGO) detector at LUNA, aiming to reduce high-energy backgrounds and to increase the summing detection efficiency. The new design results in enhanced sensitivity of the BGO setup, as we demonstrate and discuss in the context of the first direct measurement of the 65 keV resonance (Ex = 5672 keV) of the 17O(p,gamma)18F reaction. Moreover, we show two applications of the BGO detector, which exploit its segmentation. In case of complex gamma-ray cascades, e.g. the de-excitation of Ex = 5672 keV in 18F, the BGO segmentation allows to identify and suppress the beam-induced background signals that mimic the sum peak of interest. We demonstrate another new application for such a detector in form of in-site activation measurements of a reaction with beta+ unstable product nuclei, e.g., the 14N(p,gamma)15O reaction.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"1 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41692388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-06DOI: 10.1088/1361-6471/acb95f
F. Torabi, B. V. Carlson
Inclusive breakup cross sections for deuterons incident on a wide range of nuclei at different incident energies are studied. In our analysis, we use the zero-range post-form distorted-wave-Born approximation (DWBA) to calculate the elastic and nonelastic breakup cross sections. We also calculate exciton and statistical compound-nucleus model cross sections to account for preequilibrium and equilibrium emissions. The calculations are performed using the code EMPIRE and are compared to the available experimental data. The comparisons of the integrated cross sections reveal a general good agreement between the calculations and the data. However, systematic discrepancies are observed between the calculated double differential neutron and proton cross sections and the data, especially for heavier targets. Possible reasons for the disagreements between the theoretical predictions and the experimental data are discussed.
{"title":"A systematic analysis of deuteron breakup","authors":"F. Torabi, B. V. Carlson","doi":"10.1088/1361-6471/acb95f","DOIUrl":"https://doi.org/10.1088/1361-6471/acb95f","url":null,"abstract":"\u0000 Inclusive breakup cross sections for deuterons incident on a wide range of nuclei at different incident energies are studied. In our analysis, we use the zero-range post-form distorted-wave-Born approximation (DWBA) to calculate the elastic and nonelastic breakup cross sections. We also calculate exciton and statistical compound-nucleus model cross sections to account for preequilibrium and equilibrium emissions. The calculations are performed using the code EMPIRE and are compared to the available experimental data. The comparisons of the integrated cross sections reveal a general good agreement between the calculations and the data. However, systematic discrepancies are observed between the calculated double differential neutron and proton cross sections and the data, especially for heavier targets. Possible reasons for the disagreements between the theoretical predictions and the experimental data are discussed.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45771405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：