Pub Date : 2023-01-01DOI: 10.5506/aphyspolb.54.8-a3
N. Ly, N. Duy, N. K. Uyen, L. Khiem
{"title":"Beta-decay Half-life Uncertainty of the Extremely Neutron-rich Nuclei Due to Nuclear-mass Deviation","authors":"N. Ly, N. Duy, N. K. Uyen, L. Khiem","doi":"10.5506/aphyspolb.54.8-a3","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.8-a3","url":null,"abstract":"","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"77 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70741180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-01-01DOI: 10.5506/aphyspolb.54.4-a4
M. Yilmaz Şengül
{"title":"Bound-free Pair Production Mechanism in Pb–(p) Collisions at the LHC","authors":"M. Yilmaz Şengül","doi":"10.5506/aphyspolb.54.4-a4","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.4-a4","url":null,"abstract":"","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70741095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-01-01DOI: 10.5506/aphyspolb.54.9-a2
K. Pomorski, A. Dobrowolski, B. Nerlo-Pomorska, M. Warda, A. Zdeb, J. Bartel, H. Molique, C. Schmitt, Z.G. Xiao, Y.J. Chen, L.L. Liu
A rapidly converging 4-dimensional Fourier shape parametrization is used to model the fission process of heavy nuclei. Potential energy landscapes are computed within the macroscopic-microscopic approach, on top of which the multi-dimensional Langevin equation is solved to describe the fission dynamics. Charge equilibration at scission and de-excitation by neutron evaporation of the primary fragments after scission is investigated. The model describes various observables, including fission-fragment mass, charge, and kinetic energy yields, as well as post-scission neutron multiplicities and, most importantly, their correlations, which are crucial to unravel the complexity of the fission process. The parameters of the dynamical model were tuned to reproduce experimental data obtained from thermal neutron-induced fission of $^{235}$U, which allows us to discuss the transition from asymmetric to symmetric fission along the Fm isotopic chain.
{"title":"Fission Fragment Mass and Kinetic Energy Yields of Fermium Isotopes","authors":"K. Pomorski, A. Dobrowolski, B. Nerlo-Pomorska, M. Warda, A. Zdeb, J. Bartel, H. Molique, C. Schmitt, Z.G. Xiao, Y.J. Chen, L.L. Liu","doi":"10.5506/aphyspolb.54.9-a2","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.9-a2","url":null,"abstract":"A rapidly converging 4-dimensional Fourier shape parametrization is used to model the fission process of heavy nuclei. Potential energy landscapes are computed within the macroscopic-microscopic approach, on top of which the multi-dimensional Langevin equation is solved to describe the fission dynamics. Charge equilibration at scission and de-excitation by neutron evaporation of the primary fragments after scission is investigated. The model describes various observables, including fission-fragment mass, charge, and kinetic energy yields, as well as post-scission neutron multiplicities and, most importantly, their correlations, which are crucial to unravel the complexity of the fission process. The parameters of the dynamical model were tuned to reproduce experimental data obtained from thermal neutron-induced fission of $^{235}$U, which allows us to discuss the transition from asymmetric to symmetric fission along the Fm isotopic chain.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135600445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-01-01DOI: 10.5506/aphyspolb.54.8-a1
B. V. Kheswa
The generalized Brink–Axel (gBA) hypothesis suggests that the γ -ray strength function ( γ SF) of a nucleus only depends on the γ -ray energy, and not on the properties of the initial and final excitation energy levels between which the nucleus decays. This hypothesis has been tested in various studies and it is still controversial. In this study, the gBA hypothesis was tested in the A = 138 nuclear mass region by rigorously investigating the dependence of the γ SF of 138 La on both initial and final excitation energies. The results showed that the shape and absolute value of the γ SF are independent of the initial and final excitation energy. Therefore, the results of this work are in support of the generalized Brink–Axel hypothesis.
{"title":"The Rigorous Test of the Generalized Brink–Axel Hypothesis in the (A=138) Nuclear Mass Region","authors":"B. V. Kheswa","doi":"10.5506/aphyspolb.54.8-a1","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.8-a1","url":null,"abstract":"The generalized Brink–Axel (gBA) hypothesis suggests that the γ -ray strength function ( γ SF) of a nucleus only depends on the γ -ray energy, and not on the properties of the initial and final excitation energy levels between which the nucleus decays. This hypothesis has been tested in various studies and it is still controversial. In this study, the gBA hypothesis was tested in the A = 138 nuclear mass region by rigorously investigating the dependence of the γ SF of 138 La on both initial and final excitation energies. The results showed that the shape and absolute value of the γ SF are independent of the initial and final excitation energy. Therefore, the results of this work are in support of the generalized Brink–Axel hypothesis.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70741115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-01-01DOI: 10.5506/aphyspolb.54.5-a1
M. Aygun, Z. Aygun, N. Karaali
{"title":"Analysis of (^{6})Li((^{3})He,(d)^{7})Be Transfer Reaction for Different Approaches","authors":"M. Aygun, Z. Aygun, N. Karaali","doi":"10.5506/aphyspolb.54.5-a1","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.5-a1","url":null,"abstract":"","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70741104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-01-01DOI: 10.5506/aphyspolb.54.1-a3
M. Hadi, A. A. Al-Sa’ad
{"title":"Nuclear Structure of Proton-rich (^{20-23})Mg Isotopes","authors":"M. Hadi, A. A. Al-Sa’ad","doi":"10.5506/aphyspolb.54.1-a3","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.1-a3","url":null,"abstract":"","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70741267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2023-01-01DOI: 10.5506/aphyspolb.54.7-a2
M.A. Abd Rabo, G. Mahmoud, S. Aly, T. Abed-Elhameed
{"title":"On the Dynamics of Delayed and Non-delayed Fractional-order and Distributed-order Consumer Models","authors":"M.A. Abd Rabo, G. Mahmoud, S. Aly, T. Abed-Elhameed","doi":"10.5506/aphyspolb.54.7-a2","DOIUrl":"https://doi.org/10.5506/aphyspolb.54.7-a2","url":null,"abstract":"","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"125 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70741109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2022-12-30DOI: 10.5506/APhysPolB.54.5-A3
F. Klinkhamer
We present a traversable-wormhole solution of the gravitational field equation of General Relativity without need of exotic matter (exotic matter can, for example, have negative energy density and vanishing isotropic pressure). Instead of exotic matter, the solution relies on a 3-dimensional"spacetime defect"characterized by a locally vanishing metric determinant.
{"title":"Defect Wormhole: A Traversable Wormhole Without Exotic Matter","authors":"F. Klinkhamer","doi":"10.5506/APhysPolB.54.5-A3","DOIUrl":"https://doi.org/10.5506/APhysPolB.54.5-A3","url":null,"abstract":"We present a traversable-wormhole solution of the gravitational field equation of General Relativity without need of exotic matter (exotic matter can, for example, have negative energy density and vanishing isotropic pressure). Instead of exotic matter, the solution relies on a 3-dimensional\"spacetime defect\"characterized by a locally vanishing metric determinant.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42814148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2022-12-19DOI: 10.5506/APhysPolB.53.11-A4
L. Gavassino
An unstable field theory is what we obtain when we linearise the equations of an interacting field theory near an unstable state. Theories of this kind are adopted to model the onset of spontaneous symmetry breakings, when the fields are sitting on the top of the Mexican hat, and they start to “roll down” to the bottom. At present, there exists no rigorous proof that unstable quantum field theories are Lorentz-invariant (in the sense of Wigner’s theorem). Here, we show that they shouldn’t be. In fact, unstable theories always have a limited regime of applicability, and they are valid only for a very short time. As consequence, there is a preferred simultaneity hyperplane, along which the unstable theory is everywhere applicable, while a generic observer (whose four-velocity is not orthogonal to such hyperplane) must use the full non-linear theory. In summary: the current quantization schemes are “ok”, independently from whether they lead to a Lorentz-invariant theory.
{"title":"Should Unstable Quantum Field Theories be Lorentz-invariant?","authors":"L. Gavassino","doi":"10.5506/APhysPolB.53.11-A4","DOIUrl":"https://doi.org/10.5506/APhysPolB.53.11-A4","url":null,"abstract":"An unstable field theory is what we obtain when we linearise the equations of an interacting field theory near an unstable state. Theories of this kind are adopted to model the onset of spontaneous symmetry breakings, when the fields are sitting on the top of the Mexican hat, and they start to “roll down” to the bottom. At present, there exists no rigorous proof that unstable quantum field theories are Lorentz-invariant (in the sense of Wigner’s theorem). Here, we show that they shouldn’t be. In fact, unstable theories always have a limited regime of applicability, and they are valid only for a very short time. As consequence, there is a preferred simultaneity hyperplane, along which the unstable theory is everywhere applicable, while a generic observer (whose four-velocity is not orthogonal to such hyperplane) must use the full non-linear theory. In summary: the current quantization schemes are “ok”, independently from whether they lead to a Lorentz-invariant theory.","PeriodicalId":7060,"journal":{"name":"Acta Physica Polonica B","volume":"24 2","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41248583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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：