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Changes in the Spectral Characteristics of Stimulated Brillouin Scattering with Variations in Excitation Geometry 受激布里渊散射光谱特性随激发几何形状变化的变化
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-12 DOI: 10.1134/S0021364026601636
M. Karpov, A. Kudryavtseva, T. Mironova, A. Salaridze, N. Tcherniega, S. Umanskaya
{"title":"Changes in the Spectral Characteristics of Stimulated Brillouin Scattering with Variations in Excitation Geometry","authors":"M. Karpov,&nbsp;A. Kudryavtseva,&nbsp;T. Mironova,&nbsp;A. Salaridze,&nbsp;N. Tcherniega,&nbsp;S. Umanskaya","doi":"10.1134/S0021364026601636","DOIUrl":"10.1134/S0021364026601636","url":null,"abstract":"<p>This paper presents results of experimental measurements of the spectral characteristics of stimulated Brillouin scattering (SBS) in water. It is shown that, by varying the focal waist position relative to the active medium surface, one can selectively change the frequency shift and the width of the spectral line of the SBS first Stokes component, as well as the scattering efficiency. This effect opens a possibility of fine-tuning the spectral characteristics of scattering by varying the excitation geometry of the active medium.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"92 - 95"},"PeriodicalIF":1.1,"publicationDate":"2026-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601636.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148853900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Projection Operator for Angular Momentum Eigenspaces 角动量本征空间的投影算子
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-12 DOI: 10.1134/S0021364026607499
M. I. Krivoruchenko
{"title":"Projection Operator for Angular Momentum Eigenspaces","authors":"M. I. Krivoruchenko","doi":"10.1134/S0021364026607499","DOIUrl":"10.1134/S0021364026607499","url":null,"abstract":"<p>The Frobenius covariant is used to construct a projection operator onto the spin-<i>S</i> eigenspaces associated with the squares of the total and orbital angular momenta. The covariant admits two equivalent representations: as a polynomial in powers of the scalar product of the spin and orbital angular momentum operators, and as a finite expansion in terms of their respective polarization operators. A correspondence is established with Villars’ angular momentum projection, used in nuclear structure studies.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"152 - 155"},"PeriodicalIF":1.1,"publicationDate":"2026-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Superconductivity of Ca-Doped (Li, Fe)OHFeSe 掺钙（Li, Fe）OHFeSe的超导性
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-12 DOI: 10.1134/S0021364026601569
A. V. Palnichenko, I. I. Zver’kova, O. M. Vyaselev
{"title":"Superconductivity of Ca-Doped (Li, Fe)OHFeSe","authors":"A. V. Palnichenko,&nbsp;I. I. Zver’kova,&nbsp;O. M. Vyaselev","doi":"10.1134/S0021364026601569","DOIUrl":"10.1134/S0021364026601569","url":null,"abstract":"<p>Layered (Li, Fe)OHFeSe compounds are attractive due to their high-temperature superconductivity. In this work, (Li, Fe)OHFeSe samples were doped via a solvothermal method using a saturated solution of calcium glyceroxides in glycerol. Dynamic magnetic susceptibility measurements revealed that the doped samples exhibit superconductivity at a temperature of <span>({{T}_{c}} = 46{kern 1pt} )</span> K, which significantly exceeds the <span>({{T}_{c}} = 37{kern 1pt} )</span> K of the pristine samples. Based on X-ray diffraction data, it is suggested that the doping is due to the incorporation of calcium ions into the (Li, Fe)OH layers, whereas the structure of the FeSe layers in the doped (Li, Fe)OHFeSe compound remains unchanged.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 2","pages":"117 - 120"},"PeriodicalIF":1.1,"publicationDate":"2026-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148853898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Ratio of the Linewidths of Plasma and Cyclotron Resonances 等离子体与回旋加速器共振线宽之比
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-08 DOI: 10.1134/S0021364026601120
V. M. Muravev, I. V. Andreev, I. S. Shinko, A. A. Zabolotnykh, A. S. Kazakov, I. V. Kukushkin
{"title":"On the Ratio of the Linewidths of Plasma and Cyclotron Resonances","authors":"V. M. Muravev,&nbsp;I. V. Andreev,&nbsp;I. S. Shinko,&nbsp;A. A. Zabolotnykh,&nbsp;A. S. Kazakov,&nbsp;I. V. Kukushkin","doi":"10.1134/S0021364026601120","DOIUrl":"10.1134/S0021364026601120","url":null,"abstract":"<p>The linewidth of plasma resonance in a two-dimensional electron system based on an AlGaAs/GaAs heterostructure in a magnetic field has been studied experimentally and theoretically. It has been shown that the linewidth of the bulk magnetoplasma mode increases with the magnetic field from 1/τ (where <span>(tau )</span> is the electron relaxation time) in zero magnetic field up to 2/τ, which is consistent with the transition from plasma to cyclotron resonance. An analytical theoretical model has been developed to explain the observed increase in the plasma resonance linewidth in the magnetic field. The obtained results reveal the complex relaxation dynamics of plasma excitations in the presence of the magnetic field.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 11","pages":"756 - 761"},"PeriodicalIF":1.1,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601120.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148394764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Measurement of Cross Sections for the Fission of the 239Pu and 240Pu Nuclei by 0.3–500-MeV Neutrons 用0.3 - 500 mev中子测量239Pu和240Pu核裂变截面
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-08 DOI: 10.1134/S0021364026601272
A. S. Vorobyev, O. A. Shcherbakov, A. M. Tiagelskaia, N. M. Olkhovich, A. L. Barabanov, T. E. Kuz’mina
{"title":"Measurement of Cross Sections for the Fission of the 239Pu and 240Pu Nuclei by 0.3–500-MeV Neutrons","authors":"A. S. Vorobyev,&nbsp;O. A. Shcherbakov,&nbsp;A. M. Tiagelskaia,&nbsp;N. M. Olkhovich,&nbsp;A. L. Barabanov,&nbsp;T. E. Kuz’mina","doi":"10.1134/S0021364026601272","DOIUrl":"10.1134/S0021364026601272","url":null,"abstract":"<p>Cross sections for the fission of <sup>239</sup>Pu and <sup>240</sup>Pu by 0.3–500-MeV neutrons have been measured on the time-of-flight spectrometer of the GNEIS neutron complex at the Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute. Fission fragments have been detected using low-pressure position-sensitive multiwire proportional counters. The <sup>239</sup>Pu(<i>n</i>, <i>f</i>) and <sup>240</sup>Pu(<i>n</i>, <i>f</i>) fission cross sections have been measured relative to the <sup>235</sup>U(<i>n</i>, <i>f</i>) fission cross section. The obtained data are compared with the results of previous experimental works, as well as with cross sections from various libraries of evaluated data.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 11","pages":"729 - 741"},"PeriodicalIF":1.1,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601272.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148394762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Second-Stage Laser Cooling of Ytterbium Atoms without Using a First-Stage Magneto-Optical Trap 不使用第一级磁光阱的镱原子的第二级激光冷却
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-08 DOI: 10.1134/S0021364026601454
A. P. Vyalykh, A. V. Semenko, A. V. Kohanov, V. G. Palchikov, G. S. Belotelov
{"title":"Second-Stage Laser Cooling of Ytterbium Atoms without Using a First-Stage Magneto-Optical Trap","authors":"A. P. Vyalykh,&nbsp;A. V. Semenko,&nbsp;A. V. Kohanov,&nbsp;V. G. Palchikov,&nbsp;G. S. Belotelov","doi":"10.1134/S0021364026601454","DOIUrl":"10.1134/S0021364026601454","url":null,"abstract":"<p>A compact laser cooling system for transportable optical lattice clocks based on cold <sup>171</sup>Yb atoms has been presented. The system size has been reduced by eliminating the first cooling stage and using compact configurations for the main subsystems of the laser cooling system. A Zeeman slower has been modeled and developed, reducing the velocity of atoms from a thermal source to a level sufficient for their direct capture in a second-stage magneto-optical trap, avoiding the first cooling stage. A method for estimating the number of atoms and their temperature in the magneto-optical trap is presented. The performance of the compact laser cooling system with the developed Zeeman slower has been experimentally confirmed: ~10<sup>6</sup> <sup>171</sup>Yb atoms with a temperature of ~35 μK have been collected in ~1 s. The achieved parameters allow for loading of ~4000 atoms into the optical lattice.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 11","pages":"792 - 801"},"PeriodicalIF":1.1,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601454.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148394768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Capture of Thulium Atoms into a Magneto-Optical Trap and Their Detection Using the 530-nm Transition 磁光阱捕获铥原子及其530纳米跃迁探测
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-08 DOI: 10.1134/S0021364026601314
D. I. Provorchenko, A. A. Dvurechenskii, B. A. Bessmertnykh, D. A. Mishin, D. O. Tregubov, N. N. Kolachevsky, A. A. Golovizin
{"title":"Capture of Thulium Atoms into a Magneto-Optical Trap and Their Detection Using the 530-nm Transition","authors":"D. I. Provorchenko,&nbsp;A. A. Dvurechenskii,&nbsp;B. A. Bessmertnykh,&nbsp;D. A. Mishin,&nbsp;D. O. Tregubov,&nbsp;N. N. Kolachevsky,&nbsp;A. A. Golovizin","doi":"10.1134/S0021364026601314","DOIUrl":"10.1134/S0021364026601314","url":null,"abstract":"<p>The efficient capture of thulium atoms from an atomic beam into a magneto-optical trap at the spectrally narrow 530-nm transition with a natural linewidth of 350 kHz, avoiding the primary cooling stage that is standard in many experiments, has been demonstrated. To optimize the capture parameters, a machine learning method with automated control of the experimental setup and feedback has been used, which has made it possible to achieve more than 75% capture efficiency compared to the previously used configuration. In addition, the number of atoms has been measured using 530-nm probe radiation with the ability to achieve signal-to-noise levels comparable to those obtained with fluorescence detection on the strong 410-nm transition. This significantly reduces the requirements for the 410-nm laser system, which was previously used for primary cooling and detection of atoms, simplifying the experimental setup and paving the way toward transportable thulium optical clocks.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 11","pages":"783 - 791"},"PeriodicalIF":1.1,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601314.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148394769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Observation of the Single-Spin Asymmetry in the Inclusive Production of Charged Pions at 26.3 GeV at the U-70 Accelerator Complex 在U-70加速器配合物中26.3 GeV带电介子包容产生的单自旋不对称性观察
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-08 DOI: 10.1134/S0021364026601375
V. V. Moiseev, V. V. Abramov, I. G. Alekseev, N. A. Bazhanov, A. N. Vasiliev, Yu. M. Goncharenko, I. S. Gorodnov, A. B. Gridnev, N. K. Kalugin, V. A. Kachanov, N. G. Kozlenko, Yu. M. Melnik, A. P. Meshchanin, N. G. Minaev, D. A. Morozov, V. V. Mochalov, A. B. Neganov, V. M. Nesterov, D. V. Novinskii, L. V. Nogach, M. B. Nurusheva, A. F. Prudkoglyad, S. V. Ryzhikov, V. V. Ryltsov, A. V. Ryazantsev, E. I. Samigullin, D. N. Svirida, P. A. Semenov, Yu. A. Usov, A. V. Uzunyan, A. N. Fedorov, A. E. Yakutin
{"title":"Observation of the Single-Spin Asymmetry in the Inclusive Production of Charged Pions at 26.3 GeV at the U-70 Accelerator Complex","authors":"V. V. Moiseev,&nbsp;V. V. Abramov,&nbsp;I. G. Alekseev,&nbsp;N. A. Bazhanov,&nbsp;A. N. Vasiliev,&nbsp;Yu. M. Goncharenko,&nbsp;I. S. Gorodnov,&nbsp;A. B. Gridnev,&nbsp;N. K. Kalugin,&nbsp;V. A. Kachanov,&nbsp;N. G. Kozlenko,&nbsp;Yu. M. Melnik,&nbsp;A. P. Meshchanin,&nbsp;N. G. Minaev,&nbsp;D. A. Morozov,&nbsp;V. V. Mochalov,&nbsp;A. B. Neganov,&nbsp;V. M. Nesterov,&nbsp;D. V. Novinskii,&nbsp;L. V. Nogach,&nbsp;M. B. Nurusheva,&nbsp;A. F. Prudkoglyad,&nbsp;S. V. Ryzhikov,&nbsp;V. V. Ryltsov,&nbsp;A. V. Ryazantsev,&nbsp;E. I. Samigullin,&nbsp;D. N. Svirida,&nbsp;P. A. Semenov,&nbsp;Yu. A. Usov,&nbsp;A. V. Uzunyan,&nbsp;A. N. Fedorov,&nbsp;A. E. Yakutin","doi":"10.1134/S0021364026601375","DOIUrl":"10.1134/S0021364026601375","url":null,"abstract":"<p>Data on the single-spin asymmetry of inclusive charged pion production in the fragmentation region of a 26.3 GeV/<i>c</i> pion beam have been obtained using the results of measurements performed on a polarized target at the SPASCHARM facility at the U-70 accelerator complex (Protvino) in 2018. The average asymmetry values for π<sup>–</sup> and π<sup>+</sup> mesons have the same sign and a magnitude of 20%. This is the first measurement of the single-spin asymmetry of π<sup>+</sup> mesons in the π<sup>–</sup><i>p</i><sup>↑</sup> → π<sup>+</sup><i>X</i> reaction.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 11","pages":"742 - 748"},"PeriodicalIF":1.1,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601375.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148394763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnetoplasmons in a Two-Dimensional Electron Liquid with Memory Effects in Electron–Electron Interactions 电子-电子相互作用中具有记忆效应的二维电子液体中的磁等离子体
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-08 DOI: 10.1134/S002136402660059X
D. R. Raskulov, P. S. Alekseev
{"title":"Magnetoplasmons in a Two-Dimensional Electron Liquid with Memory Effects in Electron–Electron Interactions","authors":"D. R. Raskulov,&nbsp;P. S. Alekseev","doi":"10.1134/S002136402660059X","DOIUrl":"10.1134/S002136402660059X","url":null,"abstract":"<p>Magnetoplasmons in a two-dimensional electron Fermi liquid in samples with a negligible defect density have been studied. A phenomenological generalization of the Landau Fermi liquid theory has been proposed including memory effects in electron–electron interactions in the presence of an external magnetic field. It has been shown that memory effects lead to a dissipationless contribution to the complex dispersion of magnetoplasmons, additive with the dissipative contribution due to interparticle collisions. The calculated imaginary part of the dispersion, depending on the frequency and magnetic field, can be either positive or negative. Thus, instability of magnetoplasmons due to memory effects has been predicted. It has been discussed that this instability may be a key process in the formation of both the ground state of two-dimensional electrons in a density-wave magnetic field and zero-resistance states in a radio-frequency electric field.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 11","pages":"762 - 771"},"PeriodicalIF":1.1,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148394766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On Channeling of keV Atomic Beams in Flat and Cylindrical Channels 论keV原子束在平面和圆柱通道中的通道
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-07-08 DOI: 10.1134/S0021364026601417
G. V. Dedkov
{"title":"On Channeling of keV Atomic Beams in Flat and Cylindrical Channels","authors":"G. V. Dedkov","doi":"10.1134/S0021364026601417","DOIUrl":"10.1134/S0021364026601417","url":null,"abstract":"<p>The article tackles the passage (channeling) of an accelerated beam of neutral Na atoms with energies of 25‒100 keV and transverse energies of 0.5–2 eV in wide cylindrical and flat aluminum channels with a smooth amorphous wall surface. It has been shown that at the channel length-to-width (radius) ratio of the order of 100, the proportion of stopping losses of atoms due to the dissipative van der Waals force can be more than 50% with a total relative energy loss (in cylindrical channels) at a level of 0.1–2%.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"123 11","pages":"772 - 776"},"PeriodicalIF":1.1,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148394767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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