The Coulomb form factors for the elastic and inelastic electron-nucleus scatterings have been calculated for 12C and 20Ne nuclei in the ground and excited states with the same parity. We use a microscopic theory involving the effects from high configurations outside the model space, which are called the Core Polarization (CP) effects. For the core polarization matrix elements, the realistic Michigan sum of the three-range Yukawa (M3Y) interaction and the Modified Surface Delta Interaction (MSDI) are used as the two-body interactions. Additionally, the Harmonic Oscillators (HO) potential is applied to calculate wave functions. In the final step, a comparison has been made between the theoretical calculations of Coulomb form factors based on (M3Y) and (MSDI) interactions and the available experimental data. It is noticed that the Coulomb form factors for the (M3Y) interaction give a sensible delineation of the measured data.
{"title":"Comparison between the Theoretical Calculation of Coulomb Form Factors and Experimental Data for 12C and 20Ne Nuclei","authors":"H. M. Dlshad, A. Fatah","doi":"10.15407/ujpe68.3.162","DOIUrl":"https://doi.org/10.15407/ujpe68.3.162","url":null,"abstract":"The Coulomb form factors for the elastic and inelastic electron-nucleus scatterings have been calculated for 12C and 20Ne nuclei in the ground and excited states with the same parity. We use a microscopic theory involving the effects from high configurations outside the model space, which are called the Core Polarization (CP) effects. For the core polarization matrix elements, the realistic Michigan sum of the three-range Yukawa (M3Y) interaction and the Modified Surface Delta Interaction (MSDI) are used as the two-body interactions. Additionally, the Harmonic Oscillators (HO) potential is applied to calculate wave functions. In the final step, a comparison has been made between the theoretical calculations of Coulomb form factors based on (M3Y) and (MSDI) interactions and the available experimental data. It is noticed that the Coulomb form factors for the (M3Y) interaction give a sensible delineation of the measured data.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48709368","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}
Iнформацiя в мозку передається мiж нейронами за допомогою стереотипних електричних iмпульсiв, якi називаються спайками. Оскiльки активнiсть бiологiчних нейронiв є випадковою, ми вивчаємо статистику нейронної активностi, а саме часових iнтервалiв мiж послiдовно згенерованими нейроном спайками. Нейрон перетворює випадковий потiк вхiдних iмпульсiв в iнший, вихiдний потiк. Вхiдний потiк у цiй роботi описується як точковий процес вiдновлення. У якостi нейронної моделi розглядається модель зв’язуючого нейрона з порогом 2. Отримано зв’язок мiж перетвореннями Лапласа функцiй розподiлу мiжспайкових iнтервалiв для вхiдного потоку iмпульсiв та для вихiдного потоку, згенерованого у вiдповiдь на цей стимул. Отримане спiввiдно-шення дозволяє знайти саму функцiю розподiлу та всi її моменти. Отриманi формули були застосованi до випадку, коли вхiдний процес є процесом Ерланга. Зокрема, для розглянутого випадку було знайдено залежнiсть регулярностi нейронної активностi вiд параметрiв вхiдного потоку та фiзичних параметрiв нейронної моделi.
{"title":"Вихідний потік зв’язуючого нейрона з порогом 2, стимульованого процесом відновлення","authors":"O. V. Shchur","doi":"10.15407/ujpe68.3.170","DOIUrl":"https://doi.org/10.15407/ujpe68.3.170","url":null,"abstract":"Iнформацiя в мозку передається мiж нейронами за допомогою стереотипних електричних iмпульсiв, якi називаються спайками. Оскiльки активнiсть бiологiчних нейронiв є випадковою, ми вивчаємо статистику нейронної активностi, а саме часових iнтервалiв мiж послiдовно згенерованими нейроном спайками. Нейрон перетворює випадковий потiк вхiдних iмпульсiв в iнший, вихiдний потiк. Вхiдний потiк у цiй роботi описується як точковий процес вiдновлення. У якостi нейронної моделi розглядається модель зв’язуючого нейрона з порогом 2. Отримано зв’язок мiж перетвореннями Лапласа функцiй розподiлу мiжспайкових iнтервалiв для вхiдного потоку iмпульсiв та для вихiдного потоку, згенерованого у вiдповiдь на цей стимул. Отримане спiввiдно-шення дозволяє знайти саму функцiю розподiлу та всi її моменти. Отриманi формули були застосованi до випадку, коли вхiдний процес є процесом Ерланга. Зокрема, для розглянутого випадку було знайдено залежнiсть регулярностi нейронної активностi вiд параметрiв вхiдного потоку та фiзичних параметрiв нейронної моделi.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44684642","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. Bykhun, P. Gladkikh, I. Karnaukhov, V. Lyashchenko, A. Mytsykov, V. Ridozub, V. Selivanov, V. Stomin, A. Tertychnyj, I. Ushakov, A. Zelinsky
The methods of the neutron-physical parameter measurements of the subcritical assembly neutron source driven with an electron linear accelerator during start-up are described in the article. The results of neutron multiplication factor and reactivity measurements by different methods are represented. The measurement results are compared with each other and with simulation results of MCNPX code. The measured results of the facility parameters are analyzed.
{"title":"Reactivity Measurement Methods and the First Results of the Physical Start-up for the Nuclear Subcritical Facility “Neutron Source”","authors":"A. Bykhun, P. Gladkikh, I. Karnaukhov, V. Lyashchenko, A. Mytsykov, V. Ridozub, V. Selivanov, V. Stomin, A. Tertychnyj, I. Ushakov, A. Zelinsky","doi":"10.15407/ujpe68.3.147","DOIUrl":"https://doi.org/10.15407/ujpe68.3.147","url":null,"abstract":"The methods of the neutron-physical parameter measurements of the subcritical assembly neutron source driven with an electron linear accelerator during start-up are described in the article. The results of neutron multiplication factor and reactivity measurements by different methods are represented. The measurement results are compared with each other and with simulation results of MCNPX code. The measured results of the facility parameters are analyzed.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43428848","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}
We consider the possibility to use an amorphous Fe–Ni–Si–B material in the core of contactors, which are widely used in connecting and disconnecting electric circuits, instead of the crystalline material of 3% electric steel. Alloys containing Fe–Ni–Si–B have been treated with the use of mechanical, thermomechanical, and magnetic fields, and the material for practical applications has been obtained. The processing modes were chosen so that a change in the performance of ferromagnetic (below the Curie temperature) alloys during the annealing could be controlled. The obtained specimens were annealed in oil at 360 ∘C in a magnetic field of 200 A/m for 200 min. The temperature mode was chosen so that the stress relaxation could occur during the annealing, and the structural changes in the material could be observed.
我们考虑了用非晶Fe-Ni-Si-B材料代替3%电工钢的结晶材料作为接触器芯的可能性，这种材料广泛用于连接和断开电路。对含Fe-Ni-Si-B的合金进行了机械、热机械和磁场处理，获得了实际应用的材料。通过选择不同的处理方式，可以控制退火过程中铁磁合金(居里温度以下)性能的变化。将得到的样品在360°C的油中，在200 a /m的磁场中退火200分钟。选择的温度模式使材料在退火过程中发生应力松弛，可以观察到材料的结构变化。
{"title":"Prospects to Use Amorphous Fe–Ni–Si–B Ribbons in Contactor Cores","authors":"N. Rafiyev, V. I. Ahmadov, A. Isayeva","doi":"10.15407/ujpe68.3.201","DOIUrl":"https://doi.org/10.15407/ujpe68.3.201","url":null,"abstract":"We consider the possibility to use an amorphous Fe–Ni–Si–B material in the core of contactors, which are widely used in connecting and disconnecting electric circuits, instead of the crystalline material of 3% electric steel. Alloys containing Fe–Ni–Si–B have been treated with the use of mechanical, thermomechanical, and magnetic fields, and the material for practical applications has been obtained. The processing modes were chosen so that a change in the performance of ferromagnetic (below the Curie temperature) alloys during the annealing could be controlled. The obtained specimens were annealed in oil at 360 ∘C in a magnetic field of 200 A/m for 200 min. The temperature mode was chosen so that the stress relaxation could occur during the annealing, and the structural changes in the material could be observed.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43848415","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}
Основна увага в статтi придiляється означенню звiдної та незвiдної складових водневого показника рН та визначенню їх температурних i концентрацiйних залежностей у водно-сольових розчинах. Показано, що в розбавлених водних розчинах хлориду натрiю температурна залежнiсть звiдної складової рН має лiнiйний характер, що вiдрiзняється вiд аналогiчної залежностi у водi тiльки нахилом лiнiй температурної залежностi рН, який зростає зi зростанням концентрацiї солi. Незвiдна складова рН є немонотонною за температурою i приймає мiнiмальне значення за оптимальної температури життєдiяльностi людини i ссавцiв (36,6 ∘C). Встановлено iснування характерної концентрацiї солi, яка подiляє сiмейство температурних залежностей рН на двi пiдсистеми з рiзними характерами залежностi вiд температури.
{"title":"Звідна та незвідна частини водневого показника рН розбавлених водних розчинів хлориду натрію","authors":"L. Bulavin, N. Malomuzh, O. Khorolskyi","doi":"10.15407/ujpe68.3.177","DOIUrl":"https://doi.org/10.15407/ujpe68.3.177","url":null,"abstract":"Основна увага в статтi придiляється означенню звiдної та незвiдної складових водневого показника рН та визначенню їх температурних i концентрацiйних залежностей у водно-сольових розчинах. Показано, що в розбавлених водних розчинах хлориду натрiю температурна залежнiсть звiдної складової рН має лiнiйний характер, що вiдрiзняється вiд аналогiчної залежностi у водi тiльки нахилом лiнiй температурної залежностi рН, який зростає зi зростанням концентрацiї солi. Незвiдна складова рН є немонотонною за температурою i приймає мiнiмальне значення за оптимальної температури життєдiяльностi людини i ссавцiв (36,6 ∘C). Встановлено iснування характерної концентрацiї солi, яка подiляє сiмейство температурних залежностей рН на двi пiдсистеми з рiзними характерами залежностi вiд температури.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44550721","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}
We investigate the decoherence in a PT -symmetric qubit coupled with a bosonic bath. Using canonical transformations, we map the non-Hermitian Hamiltonian representing the PT-symmetric qubit to a spin boson model. Identifying the parameter α that demarcates the hermiticity and non-hermiticity in the model, we show that the qubit does not decohere at the transition from the real eigen spectrum to a complex eigen spectrum. Using a general class of spectral densities, the strong suppression of the decoherence is observed due to both vacuum and thermal fluctuations of the bath, and the initial correlations hold, as we approach the transition point.
{"title":"Decoherence in a PT -Symmetric Qubit","authors":"J. M. Bhat, M. Lone, S. Datta, G. Dar, A. Farouk","doi":"10.15407/ujpe68.2.101","DOIUrl":"https://doi.org/10.15407/ujpe68.2.101","url":null,"abstract":"We investigate the decoherence in a PT -symmetric qubit coupled with a bosonic bath. Using canonical transformations, we map the non-Hermitian Hamiltonian representing the PT-symmetric qubit to a spin boson model. Identifying the parameter α that demarcates the hermiticity and non-hermiticity in the model, we show that the qubit does not decohere at the transition from the real eigen spectrum to a complex eigen spectrum. Using a general class of spectral densities, the strong suppression of the decoherence is observed due to both vacuum and thermal fluctuations of the bath, and the initial correlations hold, as we approach the transition point.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41763619","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}
На основi лiтературних даних проведено розрахунки та аналiз температурних i баричних залежностей термодинамiчного коефiцiєнта (∂V/∂T)P для води у станi рiдини. Проведено порiвняння вказаного коефiцiєнта для води та аргону. З урахуванням принципу вiдповiдних станiв пiдтверджено iснування областi термодинамiчної подiбностi мiж водою та аргоном. При цьому iснує область, в якiй зазначена подiбнiсть мiж водою та аргоном не спостерiгається i наявна особлива поведiнка термодинамiчних властивостей води. Так, у води крива температурної залежностi (∂V/∂T)P уздовж лiнiї рiвноваги рiдина–пара має точку перегину за температури (91,0 ± 0,2)∘C, чого не спостерiгається в аргонi. Iснування для води точки перегину кривої (∂V/∂T)P приводить до вiд’ємних значень (∂V/∂T)P при температурах, нижчих 3,98∘C. Крiм того, наявнiсть точки перегину на вказанiй температурнiй залежностi приводить до перетину температурних залежностей сiмейства iзобар (∂V/∂T)P у водi при температурi (42, 0 ± 0, 2)∘C. На вiдмiну вiд цього, кривi температурної залежностi (∂V/∂T)P аргону уздовж лiнiї рiвноваги рiдина–пара не мають вiдповiдної точки перегину.
{"title":"Вплив температури та тиску на термодинамічний коефіцієнт (∂V/∂T)p води","authors":"L. Bulavin, Ye.G. Rudnikov","doi":"10.15407/ujpe68.2.122","DOIUrl":"https://doi.org/10.15407/ujpe68.2.122","url":null,"abstract":"На основi лiтературних даних проведено розрахунки та аналiз температурних i баричних залежностей термодинамiчного коефiцiєнта (∂V/∂T)P для води у станi рiдини. Проведено порiвняння вказаного коефiцiєнта для води та аргону. З урахуванням принципу вiдповiдних станiв пiдтверджено iснування областi термодинамiчної подiбностi мiж водою та аргоном. При цьому iснує область, в якiй зазначена подiбнiсть мiж водою та аргоном не спостерiгається i наявна особлива поведiнка термодинамiчних властивостей води. Так, у води крива температурної залежностi (∂V/∂T)P уздовж лiнiї рiвноваги рiдина–пара має точку перегину за температури (91,0 ± 0,2)∘C, чого не спостерiгається в аргонi. Iснування для води точки перегину кривої (∂V/∂T)P приводить до вiд’ємних значень (∂V/∂T)P при температурах, нижчих 3,98∘C. Крiм того, наявнiсть точки перегину на вказанiй температурнiй залежностi приводить до перетину температурних залежностей сiмейства iзобар (∂V/∂T)P у водi при температурi (42, 0 ± 0, 2)∘C. На вiдмiну вiд цього, кривi температурної залежностi (∂V/∂T)P аргону уздовж лiнiї рiвноваги рiдина–пара не мають вiдповiдної точки перегину.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67068724","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}
I. Bondar’, V. Suran, O. Y. Minya, O. Shuaibov, Yuriy Bilak, I. Shevera, A. Malinina, V. N. Krasilinets
The methodology, technique, and results of studies of the formation of films on the glass surface during the irradiation of water solutions of copper sulfate with the laser radiation are presented. We used the nanosecond radiation of an yttrium-aluminum garnet laser with the generation wavelength λ = 1 .06 μm. The studies used solutions with different concentrations of copper sulfate. The structure of the films obtained in this case is compared with the structure of the films obtained as a result of drying the solutions without exposure to a laser radiation. The resulting films have both ordered and disordered structures. The characteristic dimensions of the structural elements of the films are 0.5–2 μm. The transmission of films in the 300–1200 nm spectral region is studied. In general, the resulting films are transparent in this area. Their transmission practically does not depend on the wavelength, but is different for different concentrations of the solution of copper sulfate.
{"title":"Synthesis of Surface Structures during Laser-Stimulated Evaporation of a Copper Sulfate Solution in Distilled Water","authors":"I. Bondar’, V. Suran, O. Y. Minya, O. Shuaibov, Yuriy Bilak, I. Shevera, A. Malinina, V. N. Krasilinets","doi":"10.15407/ujpe68.2.138","DOIUrl":"https://doi.org/10.15407/ujpe68.2.138","url":null,"abstract":"The methodology, technique, and results of studies of the formation of films on the glass surface during the irradiation of water solutions of copper sulfate with the laser radiation are presented. We used the nanosecond radiation of an yttrium-aluminum garnet laser with the generation wavelength λ = 1 .06 μm. The studies used solutions with different concentrations of copper sulfate. The structure of the films obtained in this case is compared with the structure of the films obtained as a result of drying the solutions without exposure to a laser radiation. The resulting films have both ordered and disordered structures. The characteristic dimensions of the structural elements of the films are 0.5–2 μm. The transmission of films in the 300–1200 nm spectral region is studied. In general, the resulting films are transparent in this area. Their transmission practically does not depend on the wavelength, but is different for different concentrations of the solution of copper sulfate.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41977136","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}
Густини розподiлу нуклонiв i потенцiали ядро-ядерної взаємодiї для ядра 16O та iзотопiв 56,58,60,62,64Ni було розра-ховано в рамках модифiкованого методу Томаса–Фермi, з урахуванням усiх доданкiв до членiв другого порядку по ħ у квазикласичному розкладi кiнетичної енергiї. В ролi нуклон-нуклонної взаємодiї використовувалися сили Скiрма, залежнi вiд густини нуклонiв. Для одержаного потенцiалу знайдено вдалу параметризацiю, що дозволяє представити його в аналiтичнiй формi.
{"title":"Потенціал модифікованого методу То¬маса–Фермі та його аналітичне представлення на прикладі взаємодії 16O та ізотопів 56,58,60,62,64Ni","authors":"V.A. Nesterov","doi":"10.15407/ujpe68.2.73","DOIUrl":"https://doi.org/10.15407/ujpe68.2.73","url":null,"abstract":"Густини розподiлу нуклонiв i потенцiали ядро-ядерної взаємодiї для ядра 16O та iзотопiв 56,58,60,62,64Ni було розра-ховано в рамках модифiкованого методу Томаса–Фермi, з урахуванням усiх доданкiв до членiв другого порядку по ħ у квазикласичному розкладi кiнетичної енергiї. В ролi нуклон-нуклонної взаємодiї використовувалися сили Скiрма, залежнi вiд густини нуклонiв. Для одержаного потенцiалу знайдено вдалу параметризацiю, що дозволяє представити його в аналiтичнiй формi.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41444013","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 new form of the integrable nonlinear exciton–phonon dynamical system characterized by two physically independent parameters is suggested. The system is settled along an infinite one-dimensional regular lattice, and it admits the semi-discrete Lax representation in terms of 3 × 3 auxiliary spectral and evolution matrices. The explicit analytic four-component solution to the system’s dynamical equations found by means of the Darboux–Backlund dressing technique turns out to be of broken PT-symmetry. Each component of the solution consists of two nonlinearly superposed traveling waves that inspires the dipole–monopole crossover for the equal values of two physically distinct spatial scaling parameters of the nonlinear wave packet. The phenomenon of the dipole–monopole alternative for the spatial distribution of pseudoexcitons is shown to initiate the partial splitting between the pseudoexcitonic and vibrational subsystems at the threshold point manifested by the complete elimination of one pseudoexcitonic component and the conversion of another pseudoexcitonic component into the pseudoexcitonic chargeless half-mode.
{"title":"Dipole–Monopole Crossover and Chargeless Half-Mode in an Integrable Exciton–Phonon Nonlinear Dynamical System on a Regular One-Dimensional Lattice","authors":"O. O. Vakhnenko","doi":"10.15407/ujpe68.2.108","DOIUrl":"https://doi.org/10.15407/ujpe68.2.108","url":null,"abstract":"A new form of the integrable nonlinear exciton–phonon dynamical system characterized by two physically independent parameters is suggested. The system is settled along an infinite one-dimensional regular lattice, and it admits the semi-discrete Lax representation in terms of 3 × 3 auxiliary spectral and evolution matrices. The explicit analytic four-component solution to the system’s dynamical equations found by means of the Darboux–Backlund dressing technique turns out to be of broken PT-symmetry. Each component of the solution consists of two nonlinearly superposed traveling waves that inspires the dipole–monopole crossover for the equal values of two physically distinct spatial scaling parameters of the nonlinear wave packet. The phenomenon of the dipole–monopole alternative for the spatial distribution of pseudoexcitons is shown to initiate the partial splitting between the pseudoexcitonic and vibrational subsystems at the threshold point manifested by the complete elimination of one pseudoexcitonic component and the conversion of another pseudoexcitonic component into the pseudoexcitonic chargeless half-mode.","PeriodicalId":23400,"journal":{"name":"Ukrainian Journal of Physics","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44522665","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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