Pub Date : 2024-02-21DOI: 10.1088/1674-1137/ad2b55
Yueli Song, F. Zhou, Yong Li, Xiaopeng Zhang, P. Ji, Xiaojun Sun
The reaction cross-sections for the 175Lu(n,p)175Yb, 175Lu(n,α)172Tm, 176Lu(n,α)173Tm, 175Lu(n,2n)174mLu, and 175Lu(n,2n)174gLu reactions at the 13.57, 14.03 14.62 and 14.86 MeV neutron energies were measured by using an activation technique. The theoretical excitation functions of these reactions were calculated by using the Talys-1.95 code. The experimentally obtained reaction cross-section data were analyzed and compared with the literature experimental data, and the evaluated data of five major evaluated nuclear data libraries of IAEA, as well as with the theoretical values based on Talys-1.95. The present data at some neutron energies agree with some of the literature data, and with theoretical values based on Talys-1.95. The consistency of the theoretical curves of excitation functions based on Talys-1.95 with the present and literature data is better than that of the evaluation curves of excitation functions for the 175Lu(n,p)175Yb, 175Lu(n,α)172 Tm, and 176Lu(n,α)173Tm reactions. This work will be helpful to give new evaluated reaction cross-section data on the fusion reactor material lutetium to improve the quality of the neutron-induced reaction cross section data libraries, and advance the related application research.
{"title":"Cross sections for 14 MeV neutron interaction with lutetium isotopes and their theoretical excitation functions","authors":"Yueli Song, F. Zhou, Yong Li, Xiaopeng Zhang, P. Ji, Xiaojun Sun","doi":"10.1088/1674-1137/ad2b55","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2b55","url":null,"abstract":"\u0000 The reaction cross-sections for the 175Lu(n,p)175Yb, 175Lu(n,α)172Tm, 176Lu(n,α)173Tm, 175Lu(n,2n)174mLu, and 175Lu(n,2n)174gLu reactions at the 13.57, 14.03 14.62 and 14.86 MeV neutron energies were measured by using an activation technique. The theoretical excitation functions of these reactions were calculated by using the Talys-1.95 code. The experimentally obtained reaction cross-section data were analyzed and compared with the literature experimental data, and the evaluated data of five major evaluated nuclear data libraries of IAEA, as well as with the theoretical values based on Talys-1.95. The present data at some neutron energies agree with some of the literature data, and with theoretical values based on Talys-1.95. The consistency of the theoretical curves of excitation functions based on Talys-1.95 with the present and literature data is better than that of the evaluation curves of excitation functions for the 175Lu(n,p)175Yb, 175Lu(n,α)172 Tm, and 176Lu(n,α)173Tm reactions. This work will be helpful to give new evaluated reaction cross-section data on the fusion reactor material lutetium to improve the quality of the neutron-induced reaction cross section data libraries, and advance the related application research.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"64 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140444726","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}
Pub Date : 2024-02-20DOI: 10.1088/1674-1137/ad2b54
Jin-Li Zhang, Jun Wu
Pion and kaon photon leading-twist transition distribution amplitudes are investigated within the framework of the Nambu--Jona-Lasinio model using proper time regularization. The properties of the vector and axial vector pion photon transition distribution amplitudes are examined separately, the results satisfy the desirable properties. The sum rules and polynomiality condition are studied, the first Mellin moments of the pion and kaon photon transition distribution amplitudes correspond to the vector and axial vector pion and kaon photon form factors $F_V(t)$ and $F_A(t)$, which appear in the $pi^+rightarrow gamma e^+ nu$ process. The vector transition form factor comes from the internal structure of hadrons, the axial current can be coupled to a pion, this pion is virtual, and its contribution will be present independently of the external hadrons, kaon transition form factors are similar. The value at zero momentum transfer of the vector form factor is fixed by the axial anomaly, while this is not the case for the axial one. The diagrams of the two form factors are plotted, in addition, the neutral pion vector form factor $F_{pi gamma gamma}(t)$. We find that the axial vector transition form factor is harder than the vector transition form factor and harder than the electromagnetic form factor. The results are listed in our table, we also discuss the relationship of $pi - gamma $ and $gamma - pi$ transitions distribution amplitudes.
{"title":"Pion-photon and kaon-photon transition distribution amplitudes in the Nambu--Jona-Lasinio model","authors":"Jin-Li Zhang, Jun Wu","doi":"10.1088/1674-1137/ad2b54","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2b54","url":null,"abstract":"\u0000 Pion and kaon photon leading-twist transition distribution amplitudes are investigated within the framework of the Nambu--Jona-Lasinio model using proper time regularization. The properties of the vector and axial vector pion photon transition distribution amplitudes are examined separately, the results satisfy the desirable properties. The sum rules and polynomiality condition are studied, the first Mellin moments of the pion and kaon photon transition distribution amplitudes correspond to the vector and axial vector pion and kaon photon form factors $F_V(t)$ and $F_A(t)$, which appear in the $pi^+rightarrow gamma e^+ nu$ process. The vector transition form factor comes from the internal structure of hadrons, the axial current can be coupled to a pion, this pion is virtual, and its contribution will be present independently of the external hadrons, kaon transition form factors are similar. The value at zero momentum transfer of the vector form factor is fixed by the axial anomaly, while this is not the case for the axial one. The diagrams of the two form factors are plotted, in addition, the neutral pion vector form factor $F_{pi gamma gamma}(t)$. We find that the axial vector transition form factor is harder than the vector transition form factor and harder than the electromagnetic form factor. The results are listed in our table, we also discuss the relationship of $pi - gamma $ and $gamma - pi$ transitions distribution amplitudes.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"111 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140449301","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}
Pub Date : 2024-02-19DOI: 10.1088/1674-1137/ad2a60
R. Ali, Xia Tie Cheng, Muhammad Awais, R. Babar
In this study, we analyze the models of the deflection angle of a new Schwarzschild-like black hole and employ the optical metric of the black hole. To do so, we use the Gaussian curvature of the optical metric and the Gauss-Bonnet theorem, known as the Gibbons-Werner technique, to determine the deflection angle. Furthermore, we examine the deflection angle in the presence of the plasma medium and how the plasma medium affects the deflection angle. The deflection angle of the BH solution in the gauged super-gravity is computed using the Keeton-Petters approach. By utilizing the ray-tracing technique, we investigate the shadow of corresponding black hole and analyze the plots of the deflection angle as well as shadow to check the influence of the plasma and the algebraic thermodynamic parameters on the deflection angle and the shadow.
{"title":"Study of bending angle and shadow in a new Schwarzschild-like black hole affected by plasma and non-plasma medium","authors":"R. Ali, Xia Tie Cheng, Muhammad Awais, R. Babar","doi":"10.1088/1674-1137/ad2a60","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2a60","url":null,"abstract":"\u0000 In this study, we analyze the models of the deflection angle of a new Schwarzschild-like black hole and employ the optical metric of the black hole. To do so, we use the Gaussian curvature of the optical metric and the Gauss-Bonnet theorem, known as the Gibbons-Werner technique, to determine the deflection angle. Furthermore, we examine the deflection angle in the presence of the plasma medium and how the plasma medium affects the deflection angle. The deflection angle of the BH solution in the gauged super-gravity is computed using the Keeton-Petters approach. By utilizing the ray-tracing technique, we investigate the shadow of corresponding black hole and analyze the plots of the deflection angle as well as shadow to check the influence of the plasma and the algebraic thermodynamic parameters on the deflection angle and the shadow.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"82 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140451619","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}
Pub Date : 2024-02-13DOI: 10.1088/1674-1137/ad2a4c
M. Ajaz, Majid Shehzad, Muhammad Waqas, H. Alrebdi, Mohmmad Ayaz Ahmed, Antalov Jagnandan, Shawn Jagnandan, Murad Badshah, J. H. Baker, A. M. Quraishi
We examined the transverse momentum ($p_T$) spectra of various identified particles, encompassing both light-flavored and strange hadrons, across different multiplicity classes in proton-proton collisions (p-p) at a center-of-mass energy of $sqrt{s}$ = 7 TeV. Utilizing the Tsallis and Hagedorn models, parameters relevant to the bulk properties of nuclear matter were extracted. Both models exhibit good agreement with experimental data. In our analyses, we observed a consistent decrease in the effective temperature (T) for the Tsallis model and the kinetic or thermal freeze-out temperature ($T_0$) for the Hagedorn model, as we transition from higher multiplicity (class-I) to lower multiplicity (class-X). This trend is attributed to the diminished energy transfer in higher multiplicity classes. Additionally, the transverse flow velocity ($beta_T$) experiences a decline from class-I to class-X. The normalization constant which represents the multiplicity of produced particles is observed to decrease as we move towards higher multiplicity classes. While the effective and kinetic freeze-out temperatures, as well as the transverse flow velocity, show a mild dependency on multiplicity for lighter particles, this relationship becomes more pronounced for heavier particles. The multiplicity parameter for heavier particles is noted to be smaller in comparison to lighter particles, indicating a greater abundance of lighter hadrons compared to the heavier ones. Various particle species are observed to undergo decoupling from the fireball at distinct temperatures: lighter particles exhibit lower temperatures, while heavier ones show higher temperatures, thereby supporting the concept of multiple freeze-out scenarios. Moreover, we identified a positive correlation between the kinetic freeze-out temperature and transverse flow velocity, a scenario where particles experience stronger collective motion at higher freeze-out temperature. The reason for this positive correlation is that as the multiplicity increases, more energy is transferred into the system. This heightened energy causes greater excitation and pressure within the system, leading to a quick expansion. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd
{"title":"Multiplicity dependence of the freezeout parameters in high energy hadron-hadron collisions","authors":"M. Ajaz, Majid Shehzad, Muhammad Waqas, H. Alrebdi, Mohmmad Ayaz Ahmed, Antalov Jagnandan, Shawn Jagnandan, Murad Badshah, J. H. Baker, A. M. Quraishi","doi":"10.1088/1674-1137/ad2a4c","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2a4c","url":null,"abstract":"\u0000 We examined the transverse momentum ($p_T$) spectra of various identified particles, encompassing both light-flavored and strange hadrons, across different multiplicity classes in proton-proton collisions (p-p) at a center-of-mass energy of $sqrt{s}$ = 7 TeV. Utilizing the Tsallis and Hagedorn models, parameters relevant to the bulk properties of nuclear matter were extracted. Both models exhibit good agreement with experimental data. In our analyses, we observed a consistent decrease in the effective temperature (T) for the Tsallis model and the kinetic or thermal freeze-out temperature ($T_0$) for the Hagedorn model, as we transition from higher multiplicity (class-I) to lower multiplicity (class-X). This trend is attributed to the diminished energy transfer in higher multiplicity classes. Additionally, the transverse flow velocity ($beta_T$) experiences a decline from class-I to class-X. The normalization constant which represents the multiplicity of produced particles is observed to decrease as we move towards higher multiplicity classes. While the effective and kinetic freeze-out temperatures, as well as the transverse flow velocity, show a mild dependency on multiplicity for lighter particles, this relationship becomes more pronounced for heavier particles. The multiplicity parameter for heavier particles is noted to be smaller in comparison to lighter particles, indicating a greater abundance of lighter hadrons compared to the heavier ones. Various particle species are observed to undergo decoupling from the fireball at distinct temperatures: lighter particles exhibit lower temperatures, while heavier ones show higher temperatures, thereby supporting the concept of multiple freeze-out scenarios. Moreover, we identified a positive correlation between the kinetic freeze-out temperature and transverse flow velocity, a scenario where particles experience stronger collective motion at higher freeze-out temperature. The reason for this positive correlation is that as the multiplicity increases, more energy is transferred into the system. This heightened energy causes greater excitation and pressure within the system, leading to a quick expansion. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"28 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140457280","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}
Pub Date : 2024-01-26DOI: 10.1088/1674-1137/ad305d
Jingxuan Chen, Xiaopeng Wang, Yanbing Cai, Xurong Chen, Qian Wang
An approximated solution for gluon distribution from DGLAP evolution equations with NLO splitting function in the small-$x$ limit is presented. We first obtain the simplified forms of LO and NLO splitting functions in the small-$x$ limit. With these approximated splitting functions, we obtain the analytical gluon distribution by using the Mellin transform. The free parameters in the boundary conditions are obtained by fitting the CJ15 gluon distribution data. We find that the asymptotic behavior of the gluon distribution is consistent with the CJ15 data; however, the NLO results with the consideration of ``ladder" structure of gluon emission are slightly better than those from LO. These results indicate that the corrections from NLO has a significant influence for the behavior of the gluon distribution in small-$x$ region. In addition, we investigate the DGLAP evolution of the proton structure function by using the analytical solution of the gluon distribution. The differential structure function shows that our results have a similar tendency with CJ15 at small-$x$. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
{"title":"An analysis of the gluon distribution with next-to-leading order splitting function in small-$x$","authors":"Jingxuan Chen, Xiaopeng Wang, Yanbing Cai, Xurong Chen, Qian Wang","doi":"10.1088/1674-1137/ad305d","DOIUrl":"https://doi.org/10.1088/1674-1137/ad305d","url":null,"abstract":"\u0000 An approximated solution for gluon distribution from DGLAP evolution equations with NLO splitting function in the small-$x$ limit is presented. We first obtain the simplified forms of LO and NLO splitting functions in the small-$x$ limit. With these approximated splitting functions, we obtain the analytical gluon distribution by using the Mellin transform. The free parameters in the boundary conditions are obtained by fitting the CJ15 gluon distribution data. We find that the asymptotic behavior of the gluon distribution is consistent with the CJ15 data; however, the NLO results with the consideration of ``ladder\" structure of gluon emission are slightly better than those from LO. These results indicate that the corrections from NLO has a significant influence for the behavior of the gluon distribution in small-$x$ region. In addition, we investigate the DGLAP evolution of the proton structure function by using the analytical solution of the gluon distribution. The differential structure function shows that our results have a similar tendency with CJ15 at small-$x$. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"103 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140493482","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}
Pub Date : 2024-01-25DOI: 10.1088/1674-1137/ad2dc2
Hai-Peng Li, Jing-Yu Yi, C. W. Xiao, De-Liang Yao, Wei-Hong Liang, E. Oset
We carry a study of the correlation functions of the $B^0 D^+, B^+ D^0$ system, which develops a bound state by about $40mev$, using input consistent with the $T_{cc}(3875)$ state. Then we face the inverse problem of starting from these correlation functions to determine scattering observables related to the system, including the existence of the bound state and its molecular nature. The important output of the approach is the uncertainty by which these observables can be obtained, assuming errors in the $B^0 D^+, B^+ D^0$ correlation functions typical of current ones in present correlation functions. We observe that it is possible to obtain scattering lengths and effective ranges with relative high precision and the existence of a bound state. While the pole position is obtained with errors of the order of $50 %$ of the binding energy, the molecular probability of the state is obtained with a very small error of the order of $6%$. All these findings can serve as motivation to perform such measurements in future runs of high energy hadron collisions.
{"title":"Correlation function and the inverse problem in the $BD$ interaction","authors":"Hai-Peng Li, Jing-Yu Yi, C. W. Xiao, De-Liang Yao, Wei-Hong Liang, E. Oset","doi":"10.1088/1674-1137/ad2dc2","DOIUrl":"https://doi.org/10.1088/1674-1137/ad2dc2","url":null,"abstract":"\u0000 We carry a study of the correlation functions of the $B^0 D^+, B^+ D^0$ system, which develops a bound state by about $40mev$, using input consistent with the $T_{cc}(3875)$ state. Then we face the inverse problem of starting from these correlation functions to determine scattering observables related to the system, including the existence of the bound state and its molecular nature. The important output of the approach is the uncertainty by which these observables can be obtained, assuming errors in the $B^0 D^+, B^+ D^0$ correlation functions typical of current ones in present correlation functions. We observe that it is possible to obtain scattering lengths and effective ranges with relative high precision and the existence of a bound state. While the pole position is obtained with errors of the order of $50 %$ of the binding energy, the molecular probability of the state is obtained with a very small error of the order of $6%$. All these findings can serve as motivation to perform such measurements in future runs of high energy hadron collisions.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"13 3-4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140496387","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}
Pub Date : 2024-01-24DOI: 10.1088/1674-1137/ad21e9
Song Luo, Dong-Meng Zhang, Lin-Jing Qi, Xun Chen, Pengcheng Chu, Xiao-Hua Li
In the present work, the α-particle preformation in heavy and superheavy nuclei from {220}{Th} to {294}{Og} have been investigated. Combing the experimental α decay energies and half-lives, the α-particle preformation factors Pα are extracted from the ratios between theoretical α decay half-lives calculated by Two-Potential Approach (TPA) and experimental data. It is found that the α-particle preformation factors show the obvious odd-even staggering behavior and unpaired nucleons will inhibit α-particle preformation. Meanwhile, it is also found that both the α decay energy and the mass number of parent nucleus show considerable regularity with the extracted experimental α-particle preformation factors. After considering the major physical factors, a local phenomenological formula with only five valid parameters for α-particle preformation factors Pα is proposed. This analytic expression not only has clear physical meaning but also has good precision. As an application, this analytic formula is extended to estimate the α-particle preformation factors and further predict the α decay half-lives for unknown even-even nuclei with Z = 118 and 120.
{"title":"α particle preformation factor in heavy and superheavy nuclei","authors":"Song Luo, Dong-Meng Zhang, Lin-Jing Qi, Xun Chen, Pengcheng Chu, Xiao-Hua Li","doi":"10.1088/1674-1137/ad21e9","DOIUrl":"https://doi.org/10.1088/1674-1137/ad21e9","url":null,"abstract":"\u0000 In the present work, the α-particle preformation in heavy and superheavy nuclei from {220}{Th} to {294}{Og} have been investigated. Combing the experimental α decay energies and half-lives, the α-particle preformation factors Pα are extracted from the ratios between theoretical α decay half-lives calculated by Two-Potential Approach (TPA) and experimental data. It is found that the α-particle preformation factors show the obvious odd-even staggering behavior and unpaired nucleons will inhibit α-particle preformation. Meanwhile, it is also found that both the α decay energy and the mass number of parent nucleus show considerable regularity with the extracted experimental α-particle preformation factors. After considering the major physical factors, a local phenomenological formula with only five valid parameters for α-particle preformation factors Pα is proposed. This analytic expression not only has clear physical meaning but also has good precision. As an application, this analytic formula is extended to estimate the α-particle preformation factors and further predict the α decay half-lives for unknown even-even nuclei with Z = 118 and 120.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"24 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139600180","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}
Pub Date : 2024-01-21DOI: 10.1088/1674-1137/ad20d4
S. Sidorov, A. S. Kornilova, T. Tretyakova
The influence of the tensor interaction of nucleons on the characteristics of neutron-rich silicon and nickel isotopes was studied in this work. Tensor forces are taken into account within the framework of the Hartree-Fock approach with the Skyrme interaction. It is shown that the addition of tensor component of interaction improves the description of the splitting between different single-particle states and leads to a decrease in nucleon-nucleon pairing correlations in silicon and nickel nuclei. Special attention was given to the role of isovector tensor forces relevant for interaction of like nucleons.
{"title":"Tensor force impact on shell evolution in neutron-rich Si and Ni isotopes","authors":"S. Sidorov, A. S. Kornilova, T. Tretyakova","doi":"10.1088/1674-1137/ad20d4","DOIUrl":"https://doi.org/10.1088/1674-1137/ad20d4","url":null,"abstract":"\u0000 The influence of the tensor interaction of nucleons on the characteristics of neutron-rich silicon and nickel isotopes was studied in this work. Tensor forces are taken into account within the framework of the Hartree-Fock approach with the Skyrme interaction. It is shown that the addition of tensor component of interaction improves the description of the splitting between different single-particle states and leads to a decrease in nucleon-nucleon pairing correlations in silicon and nickel nuclei. Special attention was given to the role of isovector tensor forces relevant for interaction of like nucleons.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"12 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139609890","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}
Pub Date : 2024-01-19DOI: 10.1088/1674-1137/ad205f
Mohammad Naghdi
With a 4-form ansatz of 11-dimensional supergravity over non-dynamical $AdS_4 times S^7/Z_k$ background, with the internal space as a $S^1$ Hopf fibration on $CP^3$, we get a consistent truncation. The (pseudo)scalars, in the resulting scalar equations in Euclidean AdS$_4$ space, may be viewed as arising from (anti)M-branes wrapping around internal directions in the (Wick-rotated) skew-whiffed M2-branes background (as the resulting theory is for anti-M2-branes) and so, realizing the modes after swapping the three fundamental representations $textbf{8}_s$, $textbf{8}_c$, $textbf{8}_v$ of $SO(8)$. Taking the backreaction on the external and internal spaces, we get massless and massive modes, corresponding to exactly marginal and marginally irrelevant deformations on the boundary CFT$_3$, and write a closed solution for the bulk equation and compute its correction to the background action. Next, considering the Higgs-like (breathing) mode $m^2=18$, having all supersymmetries, parity and scale-invariance broken, by solving the associated bulk equation with mathematical methods, especially the Adomian decomposition method, and analyzing the behavior near the boundary of the solutions, we realize the boundary duals in $SU(4) times U(1)$-singlet sectors of the ABJM model. Then, introducing new dual deformation $Delta_+ = 3, 6$ operators made of bi-fundamental scalars, fermions and $U(1)$ gauge fields, we obtain $SO(4)$-invariant solutions as small instantons on a three-sphere with radius at infinity, which actually correspond to collapsing bulk bubbles leading to big-crunch singularities. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
{"title":"Higgs-like (pseudo)Scalars in AdS$_4$, Marginal and Irrelevant Deformations in CFT$_3$ and Instantons on $S^3$","authors":"Mohammad Naghdi","doi":"10.1088/1674-1137/ad205f","DOIUrl":"https://doi.org/10.1088/1674-1137/ad205f","url":null,"abstract":"\u0000 With a 4-form ansatz of 11-dimensional supergravity over non-dynamical $AdS_4 times S^7/Z_k$ background, with the internal space as a $S^1$ Hopf fibration on $CP^3$, we get a consistent truncation. The (pseudo)scalars, in the resulting scalar equations in Euclidean AdS$_4$ space, may be viewed as arising from (anti)M-branes wrapping around internal directions in the (Wick-rotated) skew-whiffed M2-branes background (as the resulting theory is for anti-M2-branes) and so, realizing the modes after swapping the three fundamental representations $textbf{8}_s$, $textbf{8}_c$, $textbf{8}_v$ of $SO(8)$. Taking the backreaction on the external and internal spaces, we get massless and massive modes, corresponding to exactly marginal and marginally irrelevant deformations on the boundary CFT$_3$, and write a closed solution for the bulk equation and compute its correction to the background action. Next, considering the Higgs-like (breathing) mode $m^2=18$, having all supersymmetries, parity and scale-invariance broken, by solving the associated bulk equation with mathematical methods, especially the Adomian decomposition method, and analyzing the behavior near the boundary of the solutions, we realize the boundary duals in $SU(4) times U(1)$-singlet sectors of the ABJM model. Then, introducing new dual deformation $Delta_+ = 3, 6$ operators made of bi-fundamental scalars, fermions and $U(1)$ gauge fields, we obtain $SO(4)$-invariant solutions as small instantons on a three-sphere with radius at infinity, which actually correspond to collapsing bulk bubbles leading to big-crunch singularities. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"74 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139613130","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}
Pub Date : 2024-01-18DOI: 10.1088/1674-1137/ad1feb
Yu-Xiang Huang, Sen Guo, Yu Liang, Yu-Hao Cui, Qing-Quan Jiang, Kai Lin
Our study investigates the astronomical implications of Rastall gravity, particularly its behavior amidst a radiation field compared to Reissner-Nordstr"{o}m (RN) black holes. Our research delineates a crucial correlation between the dynamics of the accretion disk and the parameters Q and N_{rm r}, which aptly reflect the influence of spacetime metrics on the disk's appearance. Elevated electric charge Q prompts contraction in the disk’s orbit due to enhanced gravitational effects, while higher N_{rm r} values lead to outward expansion, influenced by the radiation field's attributes. Interestingly, the charged black holes surrounded by radiation fields display distinct visual disparities from RN black holes. Brightness decreases and expansion occurs within the accretion disk's innermost stable circular orbit with rising N_{rm r} values. Our study also reveals the process by which the accretion disk transitions from a conventional disk-like structure to a hat-like form at different observation angles, with the redshift effect gradually intensifying. Moreover, the results of the Rastall gravity radiation field we consider are consistent with the constraints of the host galaxy's gravitational lensing on the Rastall gravity parameters, enhancing the consistency between theoretical predictions and actual observations.
{"title":"Rastall gravity: accretion disk image in radiation fields context and visual transformations compared to Reissner-Nordstr\"{o}m black holes","authors":"Yu-Xiang Huang, Sen Guo, Yu Liang, Yu-Hao Cui, Qing-Quan Jiang, Kai Lin","doi":"10.1088/1674-1137/ad1feb","DOIUrl":"https://doi.org/10.1088/1674-1137/ad1feb","url":null,"abstract":"\u0000 Our study investigates the astronomical implications of Rastall gravity, particularly its behavior amidst a radiation field compared to Reissner-Nordstr\"{o}m (RN) black holes. Our research delineates a crucial correlation between the dynamics of the accretion disk and the parameters Q and N_{rm r}, which aptly reflect the influence of spacetime metrics on the disk's appearance. Elevated electric charge Q prompts contraction in the disk’s orbit due to enhanced gravitational effects, while higher N_{rm r} values lead to outward expansion, influenced by the radiation field's attributes. Interestingly, the charged black holes surrounded by radiation fields display distinct visual disparities from RN black holes. Brightness decreases and expansion occurs within the accretion disk's innermost stable circular orbit with rising N_{rm r} values. Our study also reveals the process by which the accretion disk transitions from a conventional disk-like structure to a hat-like form at different observation angles, with the redshift effect gradually intensifying. Moreover, the results of the Rastall gravity radiation field we consider are consistent with the constraints of the host galaxy's gravitational lensing on the Rastall gravity parameters, enhancing the consistency between theoretical predictions and actual observations.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"111 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139614130","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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