Pub Date : 2023-03-16DOI: 10.15625/0868-3166/17582
Huong Le, Dong Xuan Tran, N. Nguyen, Minh Hien Nguyen, Cong Duy Tran, Hung Nguyen
This work presents the updated heat capacities of (^{161-164})Dy nuclei in the nuclear temperature region from 0 to 1 MeV. The updated heat capacities are obtained within the canonical ensemble method making use of the most recent and recommended experimental nuclear level density (NLD) data together with those calculated within the back-shifted Fermi gas (BSFG) model with energy-dependent parameters. By comparing the updated heat capacities with the un-updated ones, which are obtained by using the old experimental NLD data and the BSFG with energy-independent parameters, we found that the updated and un-updated heat capacities are almost identical at low temperature, but differ from each others at high temperature. This discrepancy can be interpreted by the damping of nuclear shell structure with increasing the excitation energy. Besides, we observe that the S-shape in the updated heat capacities is much more pronounced in even-even Dy isotopes than in even-odd ones, whereas the un-updated heat capacities do not clearly exhibit this S-shape. Therefore, the updated heat capacities should provide a more convincing evidence for the signature of pairing phase transition in nuclear systems.
{"title":"Updated heat capacities of (^{161-164})Dy nuclei","authors":"Huong Le, Dong Xuan Tran, N. Nguyen, Minh Hien Nguyen, Cong Duy Tran, Hung Nguyen","doi":"10.15625/0868-3166/17582","DOIUrl":"https://doi.org/10.15625/0868-3166/17582","url":null,"abstract":"This work presents the updated heat capacities of (^{161-164})Dy nuclei in the nuclear temperature region from 0 to 1 MeV. The updated heat capacities are obtained within the canonical ensemble method making use of the most recent and recommended experimental nuclear level density (NLD) data together with those calculated within the back-shifted Fermi gas (BSFG) model with energy-dependent parameters. By comparing the updated heat capacities with the un-updated ones, which are obtained by using the old experimental NLD data and the BSFG with energy-independent parameters, we found that the updated and un-updated heat capacities are almost identical at low temperature, but differ from each others at high temperature. This discrepancy can be interpreted by the damping of nuclear shell structure with increasing the excitation energy. Besides, we observe that the S-shape in the updated heat capacities is much more pronounced in even-even Dy isotopes than in even-odd ones, whereas the un-updated heat capacities do not clearly exhibit this S-shape. Therefore, the updated heat capacities should provide a more convincing evidence for the signature of pairing phase transition in nuclear systems.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76056266","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 : 2023-03-10DOI: 10.15625/0868-3166/17517
Duy Nguyen Tuan, Huong Do Thi
We investigate the branching ratio of the radiative decay $bto s gamma$ in the 3-4-1-1 model with arbitrary charge parameters $p,q$. We show that the new Higgs bosons, $mathcal{H}_1^pm$, and the new gauge bosons $W_{13,14 }^{pm p,q}, Z_{2,3}$ contribute to this decay. Of these sources, the main contribution comes from the interaction of the singly-charged Higgs boson. If the spontaneous breaking of the enlarged gauge group symmetry down to the electroweak group is around a few TeVs, the predictions for the branching ratio Br($bto s gamma$) and meson mixing are both consistent with experimental constraints.
我们研究了具有任意电荷参数$p,q$的3-4-1-1模型中辐射衰变$b到$ s gamma$的分支比。我们证明了新的希格斯玻色子$mathcal{H}_1^pm$和新的规范玻色子$W_{13,14}^{pm p,q}， Z_{2,3}$对这种衰变有贡献。在这些来源中，主要贡献来自单电荷希格斯玻色子的相互作用。如果扩大规范群对称性自发破断到电弱群大约是几个tev，则分支比Br($bto s gamma$)和介子混合的预测都符合实验约束。
{"title":"Investigation of the radiative decay $b to s gamma$ in the 3-4-1-1 model","authors":"Duy Nguyen Tuan, Huong Do Thi","doi":"10.15625/0868-3166/17517","DOIUrl":"https://doi.org/10.15625/0868-3166/17517","url":null,"abstract":"We investigate the branching ratio of the radiative decay $bto s gamma$ in the 3-4-1-1 model with arbitrary charge parameters $p,q$. We show that the new Higgs bosons, $mathcal{H}_1^pm$, and the new gauge bosons $W_{13,14 }^{pm p,q}, Z_{2,3}$ contribute to this decay. Of these sources, the main contribution comes from the interaction of the singly-charged Higgs boson. If the spontaneous breaking of the enlarged gauge group symmetry down to the electroweak group is around a few TeVs, the predictions for the branching ratio Br($bto s gamma$) and meson mixing are both consistent with experimental constraints.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75894106","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 : 2023-03-02DOI: 10.15625/0868-3166/17928
K. B. Dinh, K. A. Tran, Thong Huy Chau, V. K. Truong, Hoi Ba Nguyen, Hung Tan Nguyen, Tien Phuoc Ho, L. Dao
We describe a thorough study of the wave-mixing procedure in the extreme ultraviolet (XUV) region involving three laser fields (800 nm, 1400 nm and 1860 nm). In addition to the phase matched HHG spectrum generated by an 800-nm laser (driving field), non-integer order wave-mixing spectra are produced when the driving field and the control field (1400 nm or 1860 nm) are collinearly focused into krypton gas. In addition, the simultaneous presence of three laser fields generates resolvable four-wave mixing (FWM) frequencies that clearly indicate the contribution of each control field. We also discuss an application of the FWM scheme to extend the HHG cutoff region and generate the XUV quasi-continuum spectrum.
{"title":"Generation and application of four-wave mixing in collinear high harmonic generation","authors":"K. B. Dinh, K. A. Tran, Thong Huy Chau, V. K. Truong, Hoi Ba Nguyen, Hung Tan Nguyen, Tien Phuoc Ho, L. Dao","doi":"10.15625/0868-3166/17928","DOIUrl":"https://doi.org/10.15625/0868-3166/17928","url":null,"abstract":"We describe a thorough study of the wave-mixing procedure in the extreme ultraviolet (XUV) region involving three laser fields (800 nm, 1400 nm and 1860 nm). In addition to the phase matched HHG spectrum generated by an 800-nm laser (driving field), non-integer order wave-mixing spectra are produced when the driving field and the control field (1400 nm or 1860 nm) are collinearly focused into krypton gas. In addition, the simultaneous presence of three laser fields generates resolvable four-wave mixing (FWM) frequencies that clearly indicate the contribution of each control field. We also discuss an application of the FWM scheme to extend the HHG cutoff region and generate the XUV quasi-continuum spectrum. \u0000 ","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85124513","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 : 2023-02-21DOI: 10.15625/0868-3166/17312
T. Nga, Chu Manh Hung, Truong Tien Hoang Duong
CoFe(_{2})O(_{4})/Fe(_{3})O(_{4}) nanocomposite particles were synthesized by using co-precipitation combined with hydrothermal methods. The phase composition, surface morphology and magnetic properties of the nanocomposites were investigated using X- ray diffraction, scanning electron microscopy and vibrating sample magnetometer. Findings show that the samples comprise two phases, and Fe(_{3})O(_{4}) particles are coated on the surface of CoFe(_{2})O(_{4}) particles. The average particle size of CoFe(_{2})O(_{4}) was ditrisbuted in the range of 50 -- 100 nm. While the particle of Fe(_{3})O(_{4}) displayed a spherical shape and particle size distributed from 10 -- 20 nm. The MS of CoFe(_{2})O(_{4})@Fe(_{3})O(_{4}) core–shell particles increase with the decrease in the mass ratio of hard to soft ferrites. The structure, magnetic properties and the degree of exchange coupling between the magnetic phases were investigated.
采用共沉淀法结合水热法合成了CoFe (_{2}) O (_{4}) /Fe (_{3}) O (_{4})纳米复合颗粒。利用X射线衍射仪、扫描电镜和振动样品磁强计对纳米复合材料的相组成、表面形貌和磁性能进行了研究。结果表明，样品由两相组成，Fe (_{3}) O (_{4})颗粒包覆在CoFe (_{2}) O (_{4})颗粒表面。CoFe (_{2}) O (_{4})的平均粒径分布在50 ～ 100 nm之间。而Fe (_{3}) O (_{4})颗粒呈球形，粒径分布在10 ～ 20 nm之间。CoFe (_{2}) O (_{4}) @Fe (_{3}) O (_{4})核壳粒子的质谱随软硬铁氧体质量比的减小而增大。研究了其结构、磁性能和磁相间的交换耦合程度。
{"title":"Core/shell (textbf{CoFe}_{2}textbf{O}_{4}/textbf{Fe}_{3}textbf{O}_{4}) Nanoparticles: Effects of Hard/soft Magnetic Weight Fraction on Structure, Particle Size and Magnetic Properties","authors":"T. Nga, Chu Manh Hung, Truong Tien Hoang Duong","doi":"10.15625/0868-3166/17312","DOIUrl":"https://doi.org/10.15625/0868-3166/17312","url":null,"abstract":"CoFe(_{2})O(_{4})/Fe(_{3})O(_{4}) nanocomposite particles were synthesized by using co-precipitation combined with hydrothermal methods. The phase composition, surface morphology and magnetic properties of the nanocomposites were investigated using X- ray diffraction, scanning electron microscopy and vibrating sample magnetometer. Findings show that the samples comprise two phases, and Fe(_{3})O(_{4}) particles are coated on the surface of CoFe(_{2})O(_{4}) particles. The average particle size of CoFe(_{2})O(_{4}) was ditrisbuted in the range of 50 -- 100 nm. While the particle of Fe(_{3})O(_{4}) displayed a spherical shape and particle size distributed from 10 -- 20 nm. The MS of CoFe(_{2})O(_{4})@Fe(_{3})O(_{4}) core–shell particles increase with the decrease in the mass ratio of hard to soft ferrites. The structure, magnetic properties and the degree of exchange coupling between the magnetic phases were investigated.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74206818","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 : 2023-02-21DOI: 10.15625/0868-3166/17705
A. Parafilo, Thanh Thi Kim Nguyen
Recently, the influence of electron-electron interactions on the thermoelectric transport in a two-channel charge Kondo circuit has been studied in [Phys. Rev. B 105, L121405 (2022)]. In this paper, we revisit the Luttinger-liquid-based model and discuss in details the limit where the spin field is noninteracting ((g_sigma = 1)) and the interaction in the charge sector is repulsive ((0< g_rho leq 1)). The thermoelectric transport coefficients are computed nonperturbatively with respect to the reflection amplitude at the quantum point contact. At low temperatures the thermopower shows the non-Fermi liquid behavior in the vicinity of the Coulomb peaks. We also demonstrate that repulsive interaction results in the enhancement of the thermoelectrical power.
{"title":"Thermopower of a Luttinger-liquid-based Two-channel Charge Kondo Circuit: Nonperturbative Solution","authors":"A. Parafilo, Thanh Thi Kim Nguyen","doi":"10.15625/0868-3166/17705","DOIUrl":"https://doi.org/10.15625/0868-3166/17705","url":null,"abstract":"Recently, the influence of electron-electron interactions on the thermoelectric transport in a two-channel charge Kondo circuit has been studied in [Phys. Rev. B 105, L121405 (2022)]. In this paper, we revisit the Luttinger-liquid-based model and discuss in details the limit where the spin field is noninteracting ((g_sigma = 1)) and the interaction in the charge sector is repulsive ((0< g_rho leq 1)). The thermoelectric transport coefficients are computed nonperturbatively with respect to the reflection amplitude at the quantum point contact. At low temperatures the thermopower shows the non-Fermi liquid behavior in the vicinity of the Coulomb peaks. We also demonstrate that repulsive interaction results in the enhancement of the thermoelectrical power.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83545059","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 : 2023-02-21DOI: 10.15625/0868-3166/17946
Trong Le Dinh, Tin Nguyen Huu, Hao PHAM VAN
In this work, La(2/3)-xLi3xTiO3 (LLTO) dense ceramic samples have been prepared by high-energy ball milling and spark plasma sintering (SPS) route. The crystal structures, microstructures of the samples were characterized by X-ray powder diffraction, FE-SEM, and their Li-ion conductive properties investigated by AC impedance spectroscopy. At 21 oC, the LLTO ceramic samples possessed the grain conductivity and grain boundary/total conductivity of σg = 8.3×10-4 S cm-1 and σgb = 2.3×10-5 S cm-1, respectively. In the research temperature range from 21 oC to 120 oC, the mechanism of ion conduction is thermally activated. The activation energies for grain and grain boundary conductivities are Eag = 0.26 eV and Eagb = 0.43 eV, respectively. Keywords: High energy mechanical milling, LLTO ceramics, Spark plasma sintering, Lithium ionic conductivity, Impedance Classification numbers: 81.05.Je, 81.20.Ev, 72.20.-i, 61.72.Mm, 82.47.Aa, 84.37.+q
本文采用高能球磨和放电等离子烧结的方法制备了La(2/3)-xLi3xTiO3 (LLTO)致密陶瓷样品。采用x射线粉末衍射、FE-SEM对样品的晶体结构、微观结构进行了表征，并用交流阻抗谱研究了样品的锂离子导电性能。在21℃时，LLTO陶瓷样品的晶粒电导率和晶界/总电导率分别为σg = 8.3×10-4 S cm-1和σgb = 2.3×10-5 S cm-1。在21 ~ 120℃的研究温度范围内，离子的传导机制是热激活的。晶粒和晶界电导率的活化能分别为Eag = 0.26 eV和Eagb = 0.43 eV。关键词:高能机械铣削，LLTO陶瓷，火花等离子烧结，锂离子电导率，阻抗分类数:81.05我,81.20。电动汽车,72.20。我,61.72。82.47毫米,。Aa, 84.37。+ q
{"title":"CHARACTERIZATION OF STRUCTURE AND Li-IONIC CONDUCTIVITY OF La(2/3−x)Li3xTiO3 CERAMICS PREPARED BY SPARK PLASMA SINTERING","authors":"Trong Le Dinh, Tin Nguyen Huu, Hao PHAM VAN","doi":"10.15625/0868-3166/17946","DOIUrl":"https://doi.org/10.15625/0868-3166/17946","url":null,"abstract":"In this work, La(2/3)-xLi3xTiO3 (LLTO) dense ceramic samples have been prepared by high-energy ball milling and spark plasma sintering (SPS) route. The crystal structures, microstructures of the samples were characterized by X-ray powder diffraction, FE-SEM, and their Li-ion conductive properties investigated by AC impedance spectroscopy. At 21 oC, the LLTO ceramic samples possessed the grain conductivity and grain boundary/total conductivity of σg = 8.3×10-4 S cm-1 and σgb = 2.3×10-5 S cm-1, respectively. In the research temperature range from 21 oC to 120 oC, the mechanism of ion conduction is thermally activated. The activation energies for grain and grain boundary conductivities are Eag = 0.26 eV and Eagb = 0.43 eV, respectively. \u0000Keywords: High energy mechanical milling, LLTO ceramics, Spark plasma sintering, Lithium ionic conductivity, Impedance \u0000Classification numbers: 81.05.Je, 81.20.Ev, 72.20.-i, 61.72.Mm, 82.47.Aa, 84.37.+q","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90357100","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 : 2023-02-21DOI: 10.15625/0868-3166/17445
Anh Trinh Thi Tu, Quyet Pham Dang, Son Pham Ngoc, Hieu Phan Bao Quoc, Sang Nguyen Thi Minh, Vu Cao Dong
This paper presents the application of the MCNP5 code to conduct a modification design and simulation of a thermal neutron beam for neutron capture studies at the Dalat Nuclear Research Reactor (DNRR). The designed configuration of the horizontal neutron channel No.2 at the DNRR, which contains a conical collimator of 240.3 cm in length, and neutron filters of crystal Al2O3 and Bi with alternative thickness, were simulated. A pure thermal neutron beam can be obtained at the irradiation position when a composition of crystal filter of 20 cm Al2O3 and 6 cm Bi is employed. The thermal and epithermal neutron fluxes are 1.02´108 n/cm2/s (account for 97.92% of total neutron flux) and 0.22´107 n/cm2/s (account for 2.08% of total neutron flux), respectively.
{"title":"Design and simulation of a thermal neutron beam for neutron capture studies at the Dalat research reactor","authors":"Anh Trinh Thi Tu, Quyet Pham Dang, Son Pham Ngoc, Hieu Phan Bao Quoc, Sang Nguyen Thi Minh, Vu Cao Dong","doi":"10.15625/0868-3166/17445","DOIUrl":"https://doi.org/10.15625/0868-3166/17445","url":null,"abstract":"This paper presents the application of the MCNP5 code to conduct a modification design and simulation of a thermal neutron beam for neutron capture studies at the Dalat Nuclear Research Reactor (DNRR). The designed configuration of the horizontal neutron channel No.2 at the DNRR, which contains a conical collimator of 240.3 cm in length, and neutron filters of crystal Al2O3 and Bi with alternative thickness, were simulated. A pure thermal neutron beam can be obtained at the irradiation position when a composition of crystal filter of 20 cm Al2O3 and 6 cm Bi is employed. The thermal and epithermal neutron fluxes are 1.02´108 n/cm2/s (account for 97.92% of total neutron flux) and 0.22´107 n/cm2/s (account for 2.08% of total neutron flux), respectively.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85455747","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 : 2023-02-09DOI: 10.15625/0868-3166/17484
Thu Nguyen Thi Kim, Thi Minh Nguyen, Hong Quang Nguyen, Thi Minh Nguyen, Thi Huyen Thuong Ho, My Pham Tra, D. Vu, Hoa Nguyen Thi Quynh
A simple water-based broadband metamaterial absorber has been proposed for the terahertz region. The absorption bandwidth is extended based on large frequency dispersive permittivity and high relative dielectric loss of water. The simulated result indicates that the absorption of the proposed structure achieves over 90% in the frequency range from 0.6 to 10 THz at a normal incident angle. Moreover, the performance maintains high over 80% with a wide incident angle up to 60o for transverse electronic (TE) mode and over 90% up to 700 transverse magnetic (TM) mode in the entire operating frequency range. Therefore, the designed absorber has a potential candidate for broadband THz applications.
{"title":"A Simple Design of Water-based Broadband Metamaterial Absorber for THz Applications","authors":"Thu Nguyen Thi Kim, Thi Minh Nguyen, Hong Quang Nguyen, Thi Minh Nguyen, Thi Huyen Thuong Ho, My Pham Tra, D. Vu, Hoa Nguyen Thi Quynh","doi":"10.15625/0868-3166/17484","DOIUrl":"https://doi.org/10.15625/0868-3166/17484","url":null,"abstract":"A simple water-based broadband metamaterial absorber has been proposed for the terahertz region. The absorption bandwidth is extended based on large frequency dispersive permittivity and high relative dielectric loss of water. The simulated result indicates that the absorption of the proposed structure achieves over 90% in the frequency range from 0.6 to 10 THz at a normal incident angle. Moreover, the performance maintains high over 80% with a wide incident angle up to 60o for transverse electronic (TE) mode and over 90% up to 700 transverse magnetic (TM) mode in the entire operating frequency range. Therefore, the designed absorber has a potential candidate for broadband THz applications.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87766503","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 : 2023-02-08DOI: 10.15625/0868-3166/17431
Ngo Thi Lan, N. T. Mai, N. Dang, Nguyen Thanh Tung
Au102+ and Au20 pyramids, whose stability and inertness are comparable to those of carbon fullerene C60, are considered as important landmarks in the long-history investigation of gold nanoclusters. Numerous experimental and theoretical studies on doping Au102+ and Au20 with transition metal atoms have been carried out for specific properties that can be used as advanced materials in nanotechnology applications. In this work, we discussed the similarities and differences between the structural, stability, and electronic properties of Au9M2+ and Au19M (M = Sc-Ni) clusters using density functional theory calculations. It is found that except for the preferred dopant site, the structural evolution of Au9M2+ cluster resembles that of Au19M in general. Although the V dopant seems to be the important ingredient for the structural transformation in both species, it is remarkable that the transformation appears stronger in Au19V compared with Au9V2+. The calculated average binding energies are utilized to identify their relative stable patterns. Depending on the 3d transition metal atom dopant, the spin magnetic moments of Au9M2+ and Au19M clusters vary from 0 to 5 μB, reaching the highest value with the Cr-doped species. We show that both Au9Cr2+ and Au19Cr have similarities in the electronic structures and are potential magnetic superatoms.
{"title":"DFT investigation of pyramidal Au(_{9})M(^{2+}) and Au(_{19})M (M = Sc-Ni): Similarities and Differences of Structural Evolution, Electronic and Magnetic Properties","authors":"Ngo Thi Lan, N. T. Mai, N. Dang, Nguyen Thanh Tung","doi":"10.15625/0868-3166/17431","DOIUrl":"https://doi.org/10.15625/0868-3166/17431","url":null,"abstract":"Au102+ and Au20 pyramids, whose stability and inertness are comparable to those of carbon fullerene C60, are considered as important landmarks in the long-history investigation of gold nanoclusters. Numerous experimental and theoretical studies on doping Au102+ and Au20 with transition metal atoms have been carried out for specific properties that can be used as advanced materials in nanotechnology applications. In this work, we discussed the similarities and differences between the structural, stability, and electronic properties of Au9M2+ and Au19M (M = Sc-Ni) clusters using density functional theory calculations. It is found that except for the preferred dopant site, the structural evolution of Au9M2+ cluster resembles that of Au19M in general. Although the V dopant seems to be the important ingredient for the structural transformation in both species, it is remarkable that the transformation appears stronger in Au19V compared with Au9V2+. The calculated average binding energies are utilized to identify their relative stable patterns. Depending on the 3d transition metal atom dopant, the spin magnetic moments of Au9M2+ and Au19M clusters vary from 0 to 5 μB, reaching the highest value with the Cr-doped species. We show that both Au9Cr2+ and Au19Cr have similarities in the electronic structures and are potential magnetic superatoms.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82982212","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 : 2023-02-07DOI: 10.15625/0868-3166/18077
Thi Nhung Dao, D. Le
We present new results for the theoretical prediction of doubly-polarized cross sections of $WZ$ events at the LHC using leptonic decays. Compared to the previous studies, two new kinematic cuts are considered. These cuts are designed to enhance the doubly-longitudinal (LL) polarization and, at the same time, study the Radiation Amplitude Zero effect. We found a new cut on the rapidity separation between the $Z$ boson and the electron from the $W$ decay which makes the LL fraction largest, namely $|Delta y_{Z,e}| < 0.5$. This result is obtained at the next-to-leading order in the strong and electroweak couplings.
{"title":"Enhancing the doubly-longitudinal polarization in WZ production at the LHC","authors":"Thi Nhung Dao, D. Le","doi":"10.15625/0868-3166/18077","DOIUrl":"https://doi.org/10.15625/0868-3166/18077","url":null,"abstract":"We present new results for the theoretical prediction of doubly-polarized cross sections of $WZ$ events at the LHC using leptonic decays. Compared to the previous studies, two new kinematic cuts are considered. These cuts are designed to enhance the doubly-longitudinal (LL) polarization and, at the same time, study the Radiation Amplitude Zero effect. We found a new cut on the rapidity separation between the $Z$ boson and the electron from the $W$ decay which makes the LL fraction largest, namely $|Delta y_{Z,e}| < 0.5$. This result is obtained at the next-to-leading order in the strong and electroweak couplings.","PeriodicalId":10571,"journal":{"name":"Communications in Physics","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83257808","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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