Pub Date : 2024-07-17DOI: 10.1088/1674-1137/ad6419
H. Chaudhary, S. Pacif, U. Debnath, Prof. Farook Rahman, G. Mustafa
We are conducting an investigation to explore late-time cosmic acceleration through various dark energy parametrizations (Wettrich, Efstathiou, and Ma-Jhang) within the Horava-Lifshitz gravity framework. As an alternative to general relativity, this theory introduces anisotropic scaling at ultraviolet scales. Our primary objective is to constrain the key cosmic parameters and the Baryon Acoustic Oscillation (BAO) scale, specifically the sound horizon ($r_{d}$) by utilizing 24 uncorrelated measurements of Baryon Acoustic Oscillations (BAO) derived from recent galaxy surveys, span a redshift range from $z = 0.106$ to $z = 2.33$. Additionally, we integrate the most recent Hubble constant measurement by Riess in 2022 (denoted as R22) as an extra prior. For Wettrich, Efstathiou, and Ma-Jhang, our analysis of Baryon Acoustic Oscillation (BAO) data yields sound horizon results of $r_{d}=148.1560 pm 2.7688 mathrm{Mpc}$, $r_{d}=148.6168 pm 10.2469 mathrm{Mpc}$, and $r_{d}=147.9737 pm 10.6096 mathrm{Mpc}$, respectively. Incorporating the R22 prior into the BAO dataset results in $r_{d}=139.5806 pm 3.8522 mathrm{Mpc}$, $r_{d}=139.728025 pm 2.7858 mathrm{Mpc}$, and $r_{d}=139.6001 pm 2.7441 mathrm{Mpc}$. These outcomes highlight a distinct inconsistency between early and late observational measurements, analogous to the $H_0$ tension. A notable observation is that, when we don't include the R22 prior, the outcomes for $r_d$ tend to be in agreement with Planck and SDSS results. Following this, we conducted the Cosmography test and presented a comparative study of each parametrization with the $Lambda$CDM paradigm. Our diagnostic analyses demonstrate that all models fit seamlessly within the phantom region. The statistical analysis indicates that neither of the two models can be ruled out based on the latest observational measurements.
{"title":"Cosmological test of dark energy parametrizations within the framework of Horava-Lifshitz gravity using via Baryon Acoustic Oscillation","authors":"H. Chaudhary, S. Pacif, U. Debnath, Prof. Farook Rahman, G. Mustafa","doi":"10.1088/1674-1137/ad6419","DOIUrl":"https://doi.org/10.1088/1674-1137/ad6419","url":null,"abstract":"\u0000 We are conducting an investigation to explore late-time cosmic acceleration through various dark energy parametrizations (Wettrich, Efstathiou, and Ma-Jhang) within the Horava-Lifshitz gravity framework. As an alternative to general relativity, this theory introduces anisotropic scaling at ultraviolet scales. Our primary objective is to constrain the key cosmic parameters and the Baryon Acoustic Oscillation (BAO) scale, specifically the sound horizon ($r_{d}$) by utilizing 24 uncorrelated measurements of Baryon Acoustic Oscillations (BAO) derived from recent galaxy surveys, span a redshift range from $z = 0.106$ to $z = 2.33$. Additionally, we integrate the most recent Hubble constant measurement by Riess in 2022 (denoted as R22) as an extra prior. For Wettrich, Efstathiou, and Ma-Jhang, our analysis of Baryon Acoustic Oscillation (BAO) data yields sound horizon results of $r_{d}=148.1560 pm 2.7688 mathrm{Mpc}$, $r_{d}=148.6168 pm 10.2469 mathrm{Mpc}$, and $r_{d}=147.9737 pm 10.6096 mathrm{Mpc}$, respectively. Incorporating the R22 prior into the BAO dataset results in $r_{d}=139.5806 pm 3.8522 mathrm{Mpc}$, $r_{d}=139.728025 pm 2.7858 mathrm{Mpc}$, and $r_{d}=139.6001 pm 2.7441 mathrm{Mpc}$. These outcomes highlight a distinct inconsistency between early and late observational measurements, analogous to the $H_0$ tension. A notable observation is that, when we don't include the R22 prior, the outcomes for $r_d$ tend to be in agreement with Planck and SDSS results. Following this, we conducted the Cosmography test and presented a comparative study of each parametrization with the $Lambda$CDM paradigm. Our diagnostic analyses demonstrate that all models fit seamlessly within the phantom region. The statistical analysis indicates that neither of the two models can be ruled out based on the latest observational measurements.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":" 47","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141831207","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 : 2024-07-17DOI: 10.1088/1674-1137/ad6417
Jie-Dong Jiang, Xiao Liu, Dong-Meng Zhang, Ming Li, Xi-Jun Wu, Xiao-Hua Li
In this work, considering the preformation factor of the emitted two protons in parent nucleus S2p replaced{and the effect of the parent nucleus deformation}{}, based on the Wentzel-Kramers-Brillouin approximation and Bohr-Sommerfeld quantization condition, we added{improve} a simple phenomenological model proposed by Bayrak [J. Phys. G: 47, 025102 (2020)] to systematically study the 2p radioactivity half-lives. added{In this model, it contains two adjustable parameter V0 and aβ, which are related to the depth of nuclear potential obtained and the effect of deformation. } The calculated results show that this model can effectively reproduce the experimental data with a corresponding root-mean-square (RMS) standard deviation sigma = replaced{0.683 }{0.700}. For comparison, the Gamow-like model (GLM) proposed by Liu et al. [Chin. Phys. C 45, 044110 (2021)], the generalized liquid drop model (GLDM) proposed by Cui et al. [Phys. Rev. C 101, 014301 (2020)], replaced{effective liquid drop model (ELDM) proposed by M. Gonalves et al. [Phys. Lett. B 774, 14 (2017)], the two-potential approach with Skyrme-Hartree-Fock (TPASHF) proposed by Pan et al. [Chin. Phys. C 45, 124104 (2021)], the phenomenological model with a screened electrostatic barrier (SEB) propoesed by Zou et al. [Chin. Phys. C 45, 104101 (2021)], the unified fission model (UFM) proposed by Xing et al. [Chin. Phys. C 45, 124105 (2021)] ,the Coulomb and proximity potential model for deformed nuclei (CPPMDN) proposed by Santhosh [Phys. Rev. C textbf{104}, 064613 (2021)],}{} a two-parameter empirical formula proposed by Liu emph{et al}. [Chin. Phys. C textbf{45}, 024108 (2021)], and a four-parameter empirical formula proposed by Sreeja et al. [Eur. Phys. J. A textbf{55}, 33 (2019)] are also used. In addition, we use this model to predict the 2p radioactive half-lives of some possible potential nuclei whose 2p radioactivity are energetically allowed or observed but not yet quantified in NUBASE2020.
在这项工作中，考虑到母核S2p中发射的两个质子的预形成因子（replaced{和母核形变的影响}{}，基于Wentzel-Kramers-Brillouin近似和Bohr-Sommerfeld量子化条件，我们补充{改进}了Bayrak提出的一个简单的现象学模型[J. Phys. G: 47, 025102 (2020)]，以系统地研究2p放射性半衰期。添加了{在这个模型中，它包含两个可调参数 V0 和 aβ，这两个参数与获得的核势深度和形变效应有关。}计算结果表明，该模型能有效地再现实验数据，相应的均方根标准偏差为 sigma = replaced{0.683}{0.700}。与之相比，Liu 等人提出的类伽莫模型（GLM）[Chin. Phys. C 45, 044110 (2021)]、Cui 等人提出的广义液滴模型（GLDM）[Phys.C 101, 014301 (2020)]、M. Gonalves 等人提出的有效液滴模型（ELDM）[Phys. Lett. B 774, 14 (2017)]、Pan 等人提出的 Skyrme-Hartree-Fock 双电位方法（TPASHF）[Chin. Phys.C 45, 124104 (2021)], the phenomenological model with a screened electrostatic barrier (SEB) propoesed by Zou et al.C 45, 124105 (2021)], the Coulomb and proximity potential model for deformed nuclei (CPPMDN) proposed by Santhosh [Phys. Rev. C textbf{104}, 064613 (2021)], }{} a two-parameter empirical formula proposed by Liu emph{et al}.[Chin. Phys. C textbf{45}, 024108 (2021)]，以及 Sreeja 等人提出的四参数经验公式 [Eur. Phys. J. A textbf{55}, 33 (2019)]。此外，我们还利用这个模型来预测一些可能的潜在原子核的 2p 放射性半衰期，这些原子核的 2p 放射性在能量上是允许的，或者在 NUBASE2020 中已经观测到但尚未量化。
{"title":"A simple model for the two-proton radioactivity","authors":"Jie-Dong Jiang, Xiao Liu, Dong-Meng Zhang, Ming Li, Xi-Jun Wu, Xiao-Hua Li","doi":"10.1088/1674-1137/ad6417","DOIUrl":"https://doi.org/10.1088/1674-1137/ad6417","url":null,"abstract":"\u0000 In this work, considering the preformation factor of the emitted two protons in parent nucleus S2p replaced{and the effect of the parent nucleus deformation}{}, based on the Wentzel-Kramers-Brillouin approximation and Bohr-Sommerfeld quantization condition, we added{improve} a simple phenomenological model proposed by Bayrak [J. Phys. G: 47, 025102 (2020)] to systematically study the 2p radioactivity half-lives. added{In this model, it contains two adjustable parameter V0 and aβ, which are related to the depth of nuclear potential obtained and the effect of deformation. } The calculated results show that this model can effectively reproduce the experimental data with a corresponding root-mean-square (RMS) standard deviation sigma = replaced{0.683 }{0.700}. For comparison, the Gamow-like model (GLM) proposed by Liu et al. [Chin. Phys. C 45, 044110 (2021)], the generalized liquid drop model (GLDM) proposed by Cui et al. [Phys. Rev. C 101, 014301 (2020)], replaced{effective liquid drop model (ELDM) proposed by M. Gonalves et al. [Phys. Lett. B 774, 14 (2017)], the two-potential approach with Skyrme-Hartree-Fock (TPASHF) proposed by Pan et al. [Chin. Phys. C 45, 124104 (2021)], the phenomenological model with a screened electrostatic barrier (SEB) propoesed by Zou et al. [Chin. Phys. C 45, 104101 (2021)], the unified fission model (UFM) proposed by Xing et al. [Chin. Phys. C 45, 124105 (2021)] ,the Coulomb and proximity potential model for deformed nuclei (CPPMDN) proposed by Santhosh [Phys. Rev. C textbf{104}, 064613 (2021)],}{} a two-parameter empirical formula proposed by Liu emph{et al}. [Chin. Phys. C textbf{45}, 024108 (2021)], and a four-parameter empirical formula proposed by Sreeja et al. [Eur. Phys. J. A textbf{55}, 33 (2019)] are also used. In addition, we use this model to predict the 2p radioactive half-lives of some possible potential nuclei whose 2p radioactivity are energetically allowed or observed but not yet quantified in NUBASE2020.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":" 29","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141828145","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 : 2024-07-17DOI: 10.1088/1674-1137/ad641a
Mohamed Fellah, N. Allal, M. R. Oudih
A method for the treatment of the pairing correlations at finite temperature is proposed within the path integral formalism. It is based on the square root extraction of the pairing term in the Hamiltonian of the system. Gap equations, as well as expressions of the pairing gap parameter Δ, the energy E and the heat capacity C are established. The formalism is first tested using the Richardson model which enables comparison with exact solution. The results obtained using the present formalism are also compared to the Finite Temperature BCS (FTBCS) ones. An improvement compared to the FTBCS model is noted especially at low temperature. Indeed, it is shown that the agreement between the Δ values of the present work and the exact ones is very good at low temperature. This leads to a better agreement between the values of E and C of the present model and the exact values than with the FTBCS values. However, a critical value of the temperature still exists. Realistic cases are then considered using single-particle energies of a deformed Woods-Saxon mean-field for the nuclei ¹⁶²Dy and ¹⁷²Yb. It is shown that in the framework of the present approach, the pairing effects persist beyond the FTBCS critical temperature. Moreover, at low temperature, a good agreement between the present model results and semiexperimental values of the heat capacity is observed. A clear improvement compared to the FTBCS method is noted. It is no more the case at higher temperature.
在路径积分形式主义中提出了一种在有限温度下处理配对相关性的方法。该方法基于系统哈密顿中配对项的平方根提取。建立了配对间隙参数Δ、能量 E 和热容量 C 的间隙方程和表达式。首先使用理查森模型对形式主义进行了测试，以便与精确解进行比较。使用本形式主义得到的结果还与有限温度 BCS（FTBCS）的结果进行了比较。与 FTBCS 模型相比，特别是在低温条件下，结果有了明显改善。事实上，在低温条件下，本研究的 Δ 值与精确值的一致性非常好。这使得本模型的 E 值和 C 值与精确值之间的一致性比与 FTBCS 值之间的一致性更好。不过，温度临界值仍然存在。然后，我们使用¹⁶²Dy 核和¹⁷²Yb 核的变形伍兹-撒克逊平均场的单粒子能量来考虑实际情况。研究表明，在本方法的框架内，配对效应会持续到 FTBCS 临界温度之后。此外，在低温条件下，本模型的结果与热容量的半实验值之间具有良好的一致性。与 FTBCS 方法相比，有明显的改进。但在较高温度下，情况就不一样了。
{"title":"Thermal pairing treatment within the path integral formalism","authors":"Mohamed Fellah, N. Allal, M. R. Oudih","doi":"10.1088/1674-1137/ad641a","DOIUrl":"https://doi.org/10.1088/1674-1137/ad641a","url":null,"abstract":"\u0000 A method for the treatment of the pairing correlations at finite temperature is proposed within the path integral formalism. It is based on the square root extraction of the pairing term in the Hamiltonian of the system. Gap equations, as well as expressions of the pairing gap parameter Δ, the energy E and the heat capacity C are established. The formalism is first tested using the Richardson model which enables comparison with exact solution. The results obtained using the present formalism are also compared to the Finite Temperature BCS (FTBCS) ones. An improvement compared to the FTBCS model is noted especially at low temperature. Indeed, it is shown that the agreement between the Δ values of the present work and the exact ones is very good at low temperature. This leads to a better agreement between the values of E and C of the present model and the exact values than with the FTBCS values. However, a critical value of the temperature still exists. Realistic cases are then considered using single-particle energies of a deformed Woods-Saxon mean-field for the nuclei ¹⁶²Dy and ¹⁷²Yb. It is shown that in the framework of the present approach, the pairing effects persist beyond the FTBCS critical temperature. Moreover, at low temperature, a good agreement between the present model results and semiexperimental values of the heat capacity is observed. A clear improvement compared to the FTBCS method is noted. It is no more the case at higher temperature.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":" 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141829047","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 : 2024-05-23DOI: 10.1088/1674-1137/ad4f70
Tao Wang, Chunxiao Zhou, Dong kang Li, Lorenzo Fortunato
Recently, it has been argued that a spherical-like spectrum emerges in the SU3-IBM, opening up new approaches to understand the γ-softness in realistic nuclei. In a previous paper, γ-softness with degeneracy of the ground and quasi-γ bands was observed. In this paper, another special point connected with the middle degenerate point is discussed, which is found to be related with the properties of 196Pt. This emergent γ-softness has also been shown to be important for understanding the prolate-oblate asymmetric shape phase transition. The low-lying spectra, B(E2) values and quadrupole moments in 196Pt are discussed showing that the new model can account for several observed features. This is the first part of the discussions on the γ-soft-like spectrum of 196Pt.
{"title":"Emerging γ-soft-like spectrum in 196Pt in the SU3-IBM (I)","authors":"Tao Wang, Chunxiao Zhou, Dong kang Li, Lorenzo Fortunato","doi":"10.1088/1674-1137/ad4f70","DOIUrl":"https://doi.org/10.1088/1674-1137/ad4f70","url":null,"abstract":"\u0000 Recently, it has been argued that a spherical-like spectrum emerges in the SU3-IBM, opening up new approaches to understand the γ-softness in realistic nuclei. In a previous paper, γ-softness with degeneracy of the ground and quasi-γ bands was observed. In this paper, another special point connected with the middle degenerate point is discussed, which is found to be related with the properties of 196Pt. This emergent γ-softness has also been shown to be important for understanding the prolate-oblate asymmetric shape phase transition. The low-lying spectra, B(E2) values and quadrupole moments in 196Pt are discussed showing that the new model can account for several observed features. This is the first part of the discussions on the γ-soft-like spectrum of 196Pt.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"110 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141105748","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 : 2024-05-21DOI: 10.1088/1674-1137/ad4e24
Wei Wang
We study the mass and scattering cross section of $SU(2)$ glueballs as dark matter candidates using lattice simulations. We employ both naive and improved $SU(2)$ gauge actions in $3+1$ dimensions with several $beta$ values, and adopt both the traditional Monte Carlo method and the flow-based model based on machine learning techniques to generate lattice configurations. The mass of dark scalar glueball with $J^{PC}=0^{++}$ and the NBS wave function are calculated. Using a coupling constant of $beta=2.2$ as an illustration, we compare the dark glueball mass calculated from the configurations generated from the two methods. While consistent results can be achieved, the two methods demonstrate distinct advantages. Using the Runge-Kutta method, we extract the glueball interaction potential and two-body scattering cross section. From the observational constraints, we obtain the lower bound of the mass of scalar glueball as candidates of dark matter. 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":"A comparative lattice analysis of $SU(2)$ dark glueball","authors":"Wei Wang","doi":"10.1088/1674-1137/ad4e24","DOIUrl":"https://doi.org/10.1088/1674-1137/ad4e24","url":null,"abstract":"\u0000 We study the mass and scattering cross section of $SU(2)$ glueballs as dark matter candidates using lattice simulations. We employ both naive and improved $SU(2)$ gauge actions in $3+1$ dimensions with several $beta$ values, and adopt both the traditional Monte Carlo method and the flow-based model based on machine learning techniques to generate lattice configurations. The mass of dark scalar glueball with $J^{PC}=0^{++}$ and the NBS wave function are calculated. Using a coupling constant of $beta=2.2$ as an illustration, we compare the dark glueball mass calculated from the configurations generated from the two methods. While consistent results can be achieved, the two methods demonstrate distinct advantages. Using the Runge-Kutta method, we extract the glueball interaction potential and two-body scattering cross section. From the observational constraints, we obtain the lower bound of the mass of scalar glueball as candidates of dark matter. 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":"20 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141113889","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 : 2024-05-21DOI: 10.1088/1674-1137/ad4e25
R. C. Pantig, A. Övgün
This paper investigates the novel phenomenon of gravitational lensing experienced by gravitational waves traveling past a Schwarzschild black hole perturbed by a specific, first-order, polar gravitational wave. We utilize the Gauss-Bonnet theorem, uncovering a topological contribution to the deflection of light rays passing near the black hole. We demonstrate that the deflection angle can be determined by analyzing a region entirely outside the light ray's path, leading to a calculation based solely on the parameters of the perturbing wave (Legendre polynomial order, $l$, and frequency, $sigma$). This approach offers a unique perspective on gravitational lensing and expands our understanding of black hole interactions with gravitational waves.
{"title":"Imprints of a gravitational wave through the weak field deflection of photons","authors":"R. C. Pantig, A. Övgün","doi":"10.1088/1674-1137/ad4e25","DOIUrl":"https://doi.org/10.1088/1674-1137/ad4e25","url":null,"abstract":"\u0000 This paper investigates the novel phenomenon of gravitational lensing experienced by gravitational waves traveling past a Schwarzschild black hole perturbed by a specific, first-order, polar gravitational wave. We utilize the Gauss-Bonnet theorem, uncovering a topological contribution to the deflection of light rays passing near the black hole. We demonstrate that the deflection angle can be determined by analyzing a region entirely outside the light ray's path, leading to a calculation based solely on the parameters of the perturbing wave (Legendre polynomial order, $l$, and frequency, $sigma$). This approach offers a unique perspective on gravitational lensing and expands our understanding of black hole interactions with gravitational waves.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"87 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141116416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A cross section evaluation of neutron induced reactions on 48Ti is undertaken using the Unified Monte Carlo-B (UMC-B) approach. The evaluation focus on estimating the covarainces and the use of the UMC-B allows avoiding the deficiencies of linear regression brought by the traditional least squares method. Eight main neutron and charged particle emission reactions from n+48Ti in the fast neutron energy region below 20 MeV are studied in this work. The posterior probability density function (PDF) of each neutron cross section is obtained in a UMC-B Bayesian approach by convoluting the model PDFs sampled based on model parameters and the likelihood functions for the experimental data. Nineteen model parameters including level density, pair corrections, optical model and Kalbach matrix element parameter are stochastically sampled with the assumption of normal distributions to estimate the model uncertainty. The Cholesky factorization approach is applied to consider potential parameter correlations. Finally, the posterior covariance matrices are generated using the UMC-B generated weights. The new evaluated results are compared with the CENDL-3.2, ENDF/B-VIII.0, JEFF-3.3, TENDL-2021 and JENDL-5 evaluations and differences are discussed.
{"title":"Evaluation of Neutron Cross Sections of 48Ti based on the Unified-Monte-Carlo-B Method","authors":"Houqiong Xia, Ruirui Xu, Ping Liu, Roberto Capote, Yuan Tian, Xi Tao, Xiao-fei Wu, Yue Zhang, Zhigang Ge, Nengchuan Shu, Song Feng","doi":"10.1088/1674-1137/ad432c","DOIUrl":"https://doi.org/10.1088/1674-1137/ad432c","url":null,"abstract":"\u0000 A cross section evaluation of neutron induced reactions on 48Ti is undertaken using the Unified Monte Carlo-B (UMC-B) approach. The evaluation focus on estimating the covarainces and the use of the UMC-B allows avoiding the deficiencies of linear regression brought by the traditional least squares method. Eight main neutron and charged particle emission reactions from n+48Ti in the fast neutron energy region below 20 MeV are studied in this work. The posterior probability density function (PDF) of each neutron cross section is obtained in a UMC-B Bayesian approach by convoluting the model PDFs sampled based on model parameters and the likelihood functions for the experimental data. Nineteen model parameters including level density, pair corrections, optical model and Kalbach matrix element parameter are stochastically sampled with the assumption of normal distributions to estimate the model uncertainty. The Cholesky factorization approach is applied to consider potential parameter correlations. Finally, the posterior covariance matrices are generated using the UMC-B generated weights. The new evaluated results are compared with the CENDL-3.2, ENDF/B-VIII.0, JEFF-3.3, TENDL-2021 and JENDL-5 evaluations and differences are discussed.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140656092","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 : 2024-04-24DOI: 10.1088/1674-1137/ad4264
Gaolong 张高龙 Zhang, Zhenwei Jiao, Guangxin Zhang, Mariane Cortes, Shipeng Hu, Jianqiang Qian, D. Mengoni, Weiwei Qu, Congbo Li, Yun Zheng, Huanqiao Zhang, Hui-Bin 孙慧斌 Sun, Nan 王楠 Wang, Chunlei Zhang, Javier Valiente, Dmitry Testov, M. Mazzocco, A. Gozzelino, C. Parascandolo, Dimitra Pierroutsakou@na.infn.it, La lacommara, A. Goasduff, D. Bazzacco, Daniel Napoli, F. Galtarossa, Francesco Recchia, Andres Illana, S. Bakes, Irene Zanon, Sezgin Aydin, Giacomo Deangelis, Marco Siciliano, Roberto Menegazzo, Silvia lenzi, Jonas Ferreira, Jeannie Rangel, S. Akkoyun, Luiz Canto, J. Lubian
The complete and incomplete fusion cross sections for 6Li+209Bi were measured via the in-beam γ-ray method around the Coulomb barrier. The cross sections of (deuteron captured) incomplete fusion (ICF) products were re-quantified experimentally for this reaction system. The results reveal that the ICF cross section is equivalent to that of complete fusion (CF) above the Coulomb barrier and dominant near or below the barrier. A theoretical calculation based on the Continuum Discretized Coupled Channel (CDCC) method is performed for the aforementioned CF and ICF cross sections, and the result is consistent with the experimental ones. The universal fusion function (UFF) is also compared with the measured CF cross section with different barrier parameters, demonstrating that the CF suppression factor is quite sensitive to the choice of potential, which can reflect both dynamic and static effects of breakup on the fusion process.
{"title":"Further investigation on the fusion of 6Li with 209Bi target at near-barrier energies","authors":"Gaolong 张高龙 Zhang, Zhenwei Jiao, Guangxin Zhang, Mariane Cortes, Shipeng Hu, Jianqiang Qian, D. Mengoni, Weiwei Qu, Congbo Li, Yun Zheng, Huanqiao Zhang, Hui-Bin 孙慧斌 Sun, Nan 王楠 Wang, Chunlei Zhang, Javier Valiente, Dmitry Testov, M. Mazzocco, A. Gozzelino, C. Parascandolo, Dimitra Pierroutsakou@na.infn.it, La lacommara, A. Goasduff, D. Bazzacco, Daniel Napoli, F. Galtarossa, Francesco Recchia, Andres Illana, S. Bakes, Irene Zanon, Sezgin Aydin, Giacomo Deangelis, Marco Siciliano, Roberto Menegazzo, Silvia lenzi, Jonas Ferreira, Jeannie Rangel, S. Akkoyun, Luiz Canto, J. Lubian","doi":"10.1088/1674-1137/ad4264","DOIUrl":"https://doi.org/10.1088/1674-1137/ad4264","url":null,"abstract":"\u0000 The complete and incomplete fusion cross sections for 6Li+209Bi were measured via the in-beam γ-ray method around the Coulomb barrier. The cross sections of (deuteron captured) incomplete fusion (ICF) products were re-quantified experimentally for this reaction system. The results reveal that the ICF cross section is equivalent to that of complete fusion (CF) above the Coulomb barrier and dominant near or below the barrier. A theoretical calculation based on the Continuum Discretized Coupled Channel (CDCC) method is performed for the aforementioned CF and ICF cross sections, and the result is consistent with the experimental ones. The universal fusion function (UFF) is also compared with the measured CF cross section with different barrier parameters, demonstrating that the CF suppression factor is quite sensitive to the choice of potential, which can reflect both dynamic and static effects of breakup on the fusion process.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"31 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140664500","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 : 2024-04-24DOI: 10.1088/1674-1137/ad4269
Silu Chen, Zixuan Liu, Zhi Zhang, ruirui xu, D. Pang, Y. Xu
The consistent three-body model reaction methodology(TBMRM) proposed by J. Lee et al.[1–3], which includes adopting the simple zero-range adiabatic wave approximation, constraining the single-particle potentials using modern Hartree–Fock calculations, and using global nucleon optical model potential(OMP) geometries, are widely applied in systematic studies of transfer reactions. In this work, we study the influences of different nucleon OMPs on extraction of spectroscopic factors(SFs) from (p, d) reactions. Our study covers 32 sets of angular distribution data of (p, d) reactions on 4 targets, as well as a large range of incident energies(20-200 MeV/nucleon). Two semi-microscopic nucleon OMPs, JLM[4, 5] and CTOM[6], and a pure microscopic nucleon potential WLH[7] are used in the present work. The results are compared with those using the phenomenological global optical potential KD02[8]. We find the incident energy dependence of spectroscopic factors extracted from (p, d) reactions is obviously suppressed when microscopic OMPs are employed for 12C, 28Si and 40Ca. In addition, spectroscopic factors extracted using the systematic microscopic optical potential CTOM based on the Dirac-Brueckner-Hartree-Fock theory are more in line with the results obtained from (e, e'p) measurements, except 16O and 40Ca at high energies(> 100 MeV), calling for an exact treatment of double-magic nuclei. The results obtained by using pure microscopic optical potential WLH based on EFT theory shows the same trend but generally higher than CTOM. JLM potential, which relies on simplified nuclear matter calculations with old-fashioned bare interactions, produces very similar results with phenomenological potential KD02. Our results indicate that modern microscopic OMPs are reliable tools for probing the nuclear structure by transfer reactions across a wide energy range.
{"title":"Systematic investigation of nucleon optical model potentials in (p, d) transfer reactions","authors":"Silu Chen, Zixuan Liu, Zhi Zhang, ruirui xu, D. Pang, Y. Xu","doi":"10.1088/1674-1137/ad4269","DOIUrl":"https://doi.org/10.1088/1674-1137/ad4269","url":null,"abstract":"\u0000 The consistent three-body model reaction methodology(TBMRM) proposed by J. Lee et al.[1–3], which includes adopting the simple zero-range adiabatic wave approximation, constraining the single-particle potentials using modern Hartree–Fock calculations, and using global nucleon optical model potential(OMP) geometries, are widely applied in systematic studies of transfer reactions. In this work, we study the influences of different nucleon OMPs on extraction of spectroscopic factors(SFs) from (p, d) reactions. Our study covers 32 sets of angular distribution data of (p, d) reactions on 4 targets, as well as a large range of incident energies(20-200 MeV/nucleon). Two semi-microscopic nucleon OMPs, JLM[4, 5] and CTOM[6], and a pure microscopic nucleon potential WLH[7] are used in the present work. The results are compared with those using the phenomenological global optical potential KD02[8]. We find the incident energy dependence of spectroscopic factors extracted from (p, d) reactions is obviously suppressed when microscopic OMPs are employed for 12C, 28Si and 40Ca. In addition, spectroscopic factors extracted using the systematic microscopic optical potential CTOM based on the Dirac-Brueckner-Hartree-Fock theory are more in line with the results obtained from (e, e'p) measurements, except 16O and 40Ca at high energies(> 100 MeV), calling for an exact treatment of double-magic nuclei. The results obtained by using pure microscopic optical potential WLH based on EFT theory shows the same trend but generally higher than CTOM. JLM potential, which relies on simplified nuclear matter calculations with old-fashioned bare interactions, produces very similar results with phenomenological potential KD02. Our results indicate that modern microscopic OMPs are reliable tools for probing the nuclear structure by transfer reactions across a wide energy range.","PeriodicalId":504778,"journal":{"name":"Chinese Physics C","volume":"65 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140664884","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 : 2024-04-19DOI: 10.1088/1674-1137/ad408f
Zhi-Guo He
Within the framework of nonrelativistic-QCD factorization, we calculate both the next-to-leading-order relativistic and QCD corrections to prompt $J/psi$ pair production, with feeddown from $psi(2S)$ mesons, via photon-photon collisions at future $e^+e^-$ colliders including the Future Circular Lepton Collider (FCC-ee), the Circular Electron Positron Collider (CEPC), and the Compact Linear Collider (CLIC). We present total cross sections and distributions in single $J/psi$ transverse momentum and rapidity, and in $J/psi$ pair invariant mass. The relativistic and QCD corrections both turn out to be large and negative. Yet, the production rates are large enough for useful experimental studies. 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":"Next-to-leading order relativistic and QCD corrections to prompt $J/psi$ pair photoproduction at future $e^+e^-$ colliders","authors":"Zhi-Guo He","doi":"10.1088/1674-1137/ad408f","DOIUrl":"https://doi.org/10.1088/1674-1137/ad408f","url":null,"abstract":"\u0000 Within the framework of nonrelativistic-QCD factorization, we calculate both the next-to-leading-order relativistic and QCD corrections to prompt $J/psi$ pair production, with feeddown from $psi(2S)$ mesons, via photon-photon collisions at future $e^+e^-$ colliders including the Future Circular Lepton Collider (FCC-ee), the Circular Electron Positron Collider (CEPC), and the Compact Linear Collider (CLIC). We present total cross sections and distributions in single $J/psi$ transverse momentum and rapidity, and in $J/psi$ pair invariant mass. The relativistic and QCD corrections both turn out to be large and negative. Yet, the production rates are large enough for useful experimental studies. 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":" April","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140682516","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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