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Multiple Excitation and Decay of the 229mTh(3/2+, 8.4 eV) Isomer during the Electron Transition in the Shell of Thorium Ions 229mTh（3/2+, 8.4 eV）异构体在钍离子壳层电子跃迁过程中的多重激发和衰变
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-18 DOI: 10.1134/S0021364026608006
E. V. Tkalya
{"title":"Multiple Excitation and Decay of the 229mTh(3/2+, 8.4 eV) Isomer during the Electron Transition in the Shell of Thorium Ions","authors":"E. V. Tkalya","doi":"10.1134/S0021364026608006","DOIUrl":"10.1134/S0021364026608006","url":null,"abstract":"<p>Excitation of the nucleus <sup>229</sup>Th to a low-lying isomeric state 3/2+ (8.356 eV) during the transition of an electron between bound states in a Th ion in the case of proximity of energies and coincidence of the multipolarities of the nuclear and electronic transitions can lead to multiple coherent transfer of excitation energy from the electron shell to the nucleus and back. Thus, the electron shell plays the role of a kind of resonator for the virtual photon emitted by the nucleus. At the same time, it “breathes,” periodically decreasing and increasing in size. Such energy oscillations between the doublet of nuclear levels and the electron shell are a consequence of the relatively large interaction energy of the electron and nuclear currents. Due to the coherent nature of the phenomenon, the process under consideration becomes the main, but at the same time reversible, channel for the “decay” of both the nuclear isomer and the excited ion.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 5","pages":"315 - 321"},"PeriodicalIF":1.1,"publicationDate":"2026-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214596","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
Application of Volume Capture in Channeling in a Bent Crystal for Extracting a Circulating Beam from an Accelerator 体积捕获在弯曲晶体通道中的应用，用于从加速器中提取循环光束
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-18 DOI: 10.1134/S0021364026607608
S. F. Reshetnikov, E. V. Barnov, A. N. Vasiliev, V. V. Mochalov, V. A. Maisheev, Yu. A. Chesnokov
{"title":"Application of Volume Capture in Channeling in a Bent Crystal for Extracting a Circulating Beam from an Accelerator","authors":"S. F. Reshetnikov,&nbsp;E. V. Barnov,&nbsp;A. N. Vasiliev,&nbsp;V. V. Mochalov,&nbsp;V. A. Maisheev,&nbsp;Yu. A. Chesnokov","doi":"10.1134/S0021364026607608","DOIUrl":"10.1134/S0021364026607608","url":null,"abstract":"<p>The results of a study of the extraction of a proton beam circulating in the U-70 accelerator by a crystal using the phenomenon of volume particle capture in the channeling mode are presented. When aiming a primary beam of intensity at a crystal in the ring of the U-70 accelerator <span>(3 times {{10}^{{11}}})</span> <i>p</i>/cycle at the SPASCHARM installation, the intensity was observed up to <span>(6 times {{10}^{6}})</span> <i>p</i>/cycle. This method was implemented for the first time in global accelerator practice. Despite the lower intensity of the extracted beam compared to traditional extraction based on end-capture of particles, extraction using the volume capture phenomenon provides more stable parameters of the extracted.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 5","pages":"322 - 327"},"PeriodicalIF":1.1,"publicationDate":"2026-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214599","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
A-Dependence of the Relative Yields of Neutral Mesons in Pion–Nucleus Interactions at Plab = 7 GeV/c in the Hyperon-M Experiment 在Plab = 7 GeV/c条件下介子-核相互作用中中性介子相对产率的a依赖性
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-18 DOI: 10.1134/S0021364026607451
N. E. Voronkov, A. M. Gorin, S. V. Evdokimov, A. A. Zaitsev, V. I. Izucheev, B. V. Polishchuk, V. I. Rykalin, S. A. Sadovsky, Yu. V. Kharlov, A. A. Shangaraev
{"title":"A-Dependence of the Relative Yields of Neutral Mesons in Pion–Nucleus Interactions at Plab = 7 GeV/c in the Hyperon-M Experiment","authors":"N. E. Voronkov,&nbsp;A. M. Gorin,&nbsp;S. V. Evdokimov,&nbsp;A. A. Zaitsev,&nbsp;V. I. Izucheev,&nbsp;B. V. Polishchuk,&nbsp;V. I. Rykalin,&nbsp;S. A. Sadovsky,&nbsp;Yu. V. Kharlov,&nbsp;A. A. Shangaraev","doi":"10.1134/S0021364026607451","DOIUrl":"10.1134/S0021364026607451","url":null,"abstract":"<p>The measurement results <span>(A)</span>-dependences of the relative yields of neutral mesons <span>({{pi }^{0}})</span>, <span>(omega (782))</span>, <span>({{f}_{2}}(1270))</span> and <span>(K_{S}^{0})</span> in relation to <span>(eta )</span>-meson produced in <span>({{pi }^{ + }}A)</span>-interactions at a momentum of 7 GeV/<i>c</i> are presented. The measurements were performed on six nuclear targets (Be, C, Al, Cu, Sn, Pb) in the Hyperon-M experiment at the U-70 accelerator complex. Mesons were identified by their photon decays using the LGD2 wide-aperture electromagnetic calorimeter. The yield ratios of the mesons under study to the yield <span>(eta )</span>-mesons were measured in the beam fragmentation region (<span>({{x}_{F}} &gt; 0.6)</span> in the center of mass system <span>(pi N)</span>-reactions). It is shown that the relative yields of non-strange mesons (<span>({{pi }^{0}})</span>, <span>(omega (782))</span>, <span>({{f}_{2}}(1270))</span>) decrease with increasing the mass number of the target nucleus. At the same time, the yield ratio <span>(K_{S}^{0}{text{/}}eta )</span> demonstrates a steady statistically significant increase with increasing <span>(A)</span>. The obtained results are important for the study of hadron–nucleus interactions at intermediate energies, including testing and fine-tuning transport models such as GiBUU, PHSD, UrQMD, SMASH, regarding the influence of collective effects in the nucleus on the production of mesons with different quark compositions.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 5","pages":"336 - 344"},"PeriodicalIF":1.1,"publicationDate":"2026-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214546","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
Temperature Dependence of the Nucleation Field in Isolated and Exchange-Coupled Ultrathin Co Films 分离和交换耦合超薄钴膜成核场的温度依赖性
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-18 DOI: 10.1134/S0021364026607517
R. S. Evstigneev, Yu. P. Kabanov, L. S. Uspenskaya, V. S. Gornakov
{"title":"Temperature Dependence of the Nucleation Field in Isolated and Exchange-Coupled Ultrathin Co Films","authors":"R. S. Evstigneev,&nbsp;Yu. P. Kabanov,&nbsp;L. S. Uspenskaya,&nbsp;V. S. Gornakov","doi":"10.1134/S0021364026607517","DOIUrl":"10.1134/S0021364026607517","url":null,"abstract":"<p>In the temperature range <span>(T = 30{-} 300)</span> K, the process of magnetization reversal of ultrathin Co layers, isolated and exchange-coupled through a Pd layer, was experimentally studied, and the nucleation fields <span>({{H}_{N}})</span> were determined. It was found that a crossover is observed in the <span>({{H}_{N}}(T))</span> dependences of exchange-coupled films. In the high temperature region, where the layers undergo magnetization reversal independently of each other, as in single-layer films, <span>({{H}_{N}} sim {{T}^{{ - 1}}})</span>, in the low temperature region, where the layers undergo a correlated magnetization reversal, <span>({{H}_{N}} sim ln ({{T}^{{ - 1}}}))</span>. The performed numerical calculations showed interlayer exchange interaction is the key factor driving nucleation in the heterostructure, qualitatively explaining the observed dependence <span>({{H}_{N}}(T))</span>.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 5","pages":"399 - 404"},"PeriodicalIF":1.1,"publicationDate":"2026-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149214544","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
Spectrograph for the Wavelength Range of 10–60 Å 波长范围为10-60的光谱仪Å
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-01 DOI: 10.1134/S0021364026607773
A. O. Kolesnikov, M. D. Logachev, E. A. Vishnyakov, A. N. Shatokhin, E. N. Ragozin
{"title":"Spectrograph for the Wavelength Range of 10–60 Å","authors":"A. O. Kolesnikov,&nbsp;M. D. Logachev,&nbsp;E. A. Vishnyakov,&nbsp;A. N. Shatokhin,&nbsp;E. N. Ragozin","doi":"10.1134/S0021364026607773","DOIUrl":"10.1134/S0021364026607773","url":null,"abstract":"<p>A diffraction spectrograph for the soft X-ray range with a grazing angle of 1.5°, which is compatible with modern CCD and CMOS detectors, has been developed and tested. Spectral decomposition is performed by a high-frequency spherical varied line-space grating, which produces a flat field in the wavelength range of 10‒60 Å. The spectrograph has been tested recording line spectra of multiply charged ions excited in laser plasmas of Teflon, aluminum, and titanium.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 4","pages":"234 - 239"},"PeriodicalIF":1.1,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026607773.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097944","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
Directed Coulomb Explosion during Relativistic Self-Trapping of an Intense Laser Pulse 强激光脉冲相对论性自俘获过程中的定向库仑爆炸
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-01 DOI: 10.1134/S0021364026607256
A. J. Castillo, S. G. Bochkarev, M. G. Lobok, V. Yu. Bychenkov
{"title":"Directed Coulomb Explosion during Relativistic Self-Trapping of an Intense Laser Pulse","authors":"A. J. Castillo,&nbsp;S. G. Bochkarev,&nbsp;M. G. Lobok,&nbsp;V. Yu. Bychenkov","doi":"10.1134/S0021364026607256","DOIUrl":"10.1134/S0021364026607256","url":null,"abstract":"<p>It has been shown that the relativistic self-trapping regime of an intense ultrashort laser pulse propagating in a plasma of a near-critical density can be used to create a highly efficient source of laser-accelerated ions. Practically significant characteristics of protons accelerated mainly due to the directed Coulomb explosion of a charged cavity upon reaching the rear edge of the target during relativistic self-trapping have been obtained in the three-dimensional numerical simulation of proton acceleration. In comparison with the most efficient method of accelerating protons by laser irradiation of ultrathin films, the studied mechanism has demonstrated the possibility of achieving the same, or even slightly higher, record energy of accelerated particles, without requiring ultra-high radiation contrast.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 4","pages":"256 - 264"},"PeriodicalIF":1.1,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026607256.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097961","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
Parametric Down-Conversion with the Lateral Emission of Idler Photons from the Nonlinear Interaction Region 非线性相互作用区惰光子侧向发射的参量下转换
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-01 DOI: 10.1134/S0021364026607724
G. Kh. Kitaeva, A. V. Osipenkov
{"title":"Parametric Down-Conversion with the Lateral Emission of Idler Photons from the Nonlinear Interaction Region","authors":"G. Kh. Kitaeva,&nbsp;A. V. Osipenkov","doi":"10.1134/S0021364026607724","DOIUrl":"10.1134/S0021364026607724","url":null,"abstract":"<p>A method has been developed to analyze noncollinear schemes of highly nondegenerate parametric down-conversion, taking into account the transverse limitation of the pump region such that low-frequency idler photons leave the nonlinear interaction region before signal photons, crossing the boundaries of the pump beam or the side of a nonlinear crystal. General expressions have been obtained for the second and fourth moments of the fields in schemes with losses of idler photons generated under spatial phase matching conditions at various angles to the pump propagation direction. It has been shown that the effects of leakage of idler photons through the side with increasing scattering angle lead to an overall decrease in the numbers of photons detected in the signal and idler channels. A counterintuitive result has been obtained, indicating that the considered loss mechanism can lead to a significant increase in the biphoton correlation function, determined not only by a decrease in the total number of generated photons, but also by the ratio of the projections of the idler and signal wave vectors on the pump direction.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 4","pages":"246 - 255"},"PeriodicalIF":1.1,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097966","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
Drop in the Hall Resistance As a Possible Indication of a Transition to a Zero-Filling-Factor Quantum Hall Effect State in a HgTe/CdHgTe Double Quantum Well 在HgTe/CdHgTe双量子阱中，霍尔电阻下降作为向零填充因子量子霍尔效应态过渡的可能指示
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-01 DOI: 10.1134/S0021364026601247
M. V. Yakunin, V. N. Neverov, A. S. Bogolyubskii, S. D. Popov, K. V. Turutkin, A. Yu. Pavlova, S. V. Gudina, N. S. Sandakov, N. N. Mikhailov, S. A. Dvoretsky
{"title":"Drop in the Hall Resistance As a Possible Indication of a Transition to a Zero-Filling-Factor Quantum Hall Effect State in a HgTe/CdHgTe Double Quantum Well","authors":"M. V. Yakunin,&nbsp;V. N. Neverov,&nbsp;A. S. Bogolyubskii,&nbsp;S. D. Popov,&nbsp;K. V. Turutkin,&nbsp;A. Yu. Pavlova,&nbsp;S. V. Gudina,&nbsp;N. S. Sandakov,&nbsp;N. N. Mikhailov,&nbsp;S. A. Dvoretsky","doi":"10.1134/S0021364026601247","DOIUrl":"10.1134/S0021364026601247","url":null,"abstract":"<p>A decrease in the Hall resistance ρ<sub><i>yx</i></sub>(<i>B</i>) in high magnetic fields has been observed in HgTe/CdHgTe double quantum well heterostructures after reaching the quantum Hall effect phase with a filling factor of ν = 1, indicating a possible transition to a state with ν = 0. A comparison with the calculated Fermi level trajectories in the picture of Landau levels suggests that this decrease in ρ<sub><i>yx</i></sub>(<i>B</i>) can be attributed to the mutual influence of the electron and hole states in this system. Correlations between the chiral trajectories of electrons and holes in the two layers of the double quantum well also likely contribute, since this effect has not been observed in identical heterostructures with a single HgTe quantum well.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 4","pages":"291 - 300"},"PeriodicalIF":1.1,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026601247.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097943","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
On the Possibility of Lasing in Luminophores with an Anomalously Large Stokes Shift 关于具有异常大斯托克斯位移的发光团中激光的可能性
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-01 DOI: 10.1134/S0021364026607578
E. V. Parfenova, N. V. Slyusarenko, D. M. Ezhov, O. V. Shabanova, K. A. Shaikhutdinov, E. A. Slyusareva
{"title":"On the Possibility of Lasing in Luminophores with an Anomalously Large Stokes Shift","authors":"E. V. Parfenova,&nbsp;N. V. Slyusarenko,&nbsp;D. M. Ezhov,&nbsp;O. V. Shabanova,&nbsp;K. A. Shaikhutdinov,&nbsp;E. A. Slyusareva","doi":"10.1134/S0021364026607578","DOIUrl":"10.1134/S0021364026607578","url":null,"abstract":"<p>The spectral and photophysical properties of two colorless compounds 2-(1,3-benzothiazol-2-yl)-bromophenol and N-[2-(4-oxo-3,4-dihydroquinazolin-2-yl)phenyl]naphthalene-2-sulfonamide with an anomalously large Stokes shift of luminescence have been investigated. The possibility of lasing with a potentially broad tuning of the spectral band in the green–yellow spectral region under pumping by the third harmonic of a Nd:YAG laser has been demonstrated in 2-(1,3-benzothiazol-2-yl)-bromophenol.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 4","pages":"240 - 245"},"PeriodicalIF":1.1,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364026607578.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097942","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
Enhancement of Axial Magnetic Field Generation during Relativistic Self-Channeling of Laser Radiation Propagating Along Thin Films 激光沿薄膜传播相对论性自通道时轴向磁场产生的增强
IF 1.1 4区 物理与天体物理
JETP Letters Pub Date : 2026-10-01 DOI: 10.1134/S0021364025610048
V. A. Kuleshova, A. V. Korzhimanov
{"title":"Enhancement of Axial Magnetic Field Generation during Relativistic Self-Channeling of Laser Radiation Propagating Along Thin Films","authors":"V. A. Kuleshova,&nbsp;A. V. Korzhimanov","doi":"10.1134/S0021364025610048","DOIUrl":"10.1134/S0021364025610048","url":null,"abstract":"<p>Within the framework of a stationary model of relativistic self-focusing, it is shown that the addition of a thin layer of denser plasma on the propagation axis of a circularly polarized beam increases the axial magnetic field generated by it via the inverse Faraday effect by more than a factor of 10 compared to the case of a homogeneous plasma. The magnitude of the axial field in this case can exceed the magnetic field of the laser wave, which makes it possible, at radiation intensities ~10<sup>26</sup> W/cm<sup>2</sup> potentially achievable in the near future, to approach the level of teragauss quasi-stationary fields.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"124 4","pages":"223 - 233"},"PeriodicalIF":1.1,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025610048.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097967","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
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