{"title":"Partial-wave analysis for photoproduction of pseudoscalar mesons with truncation in total angular momentum","authors":"A. Fix, I. Dementjev","doi":"10.1140/epja/s10050-024-01398-0","DOIUrl":"10.1140/epja/s10050-024-01398-0","url":null,"abstract":"<div><p>A partial-wave analysis (PWA) for the photoproduction of pseudoscalar mesons on a nucleon using truncation in total angular momentum <i>j</i> is discussed. A formalism is described that can be used for investigating discrete ambiguities. Considerable attention is devoted to the connection of this type of PWA with that based on the truncation in orbital angular momentum <i>l</i>.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01398-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
{"title":"Quantifying the jet energy loss in Pb+Pb collisions at LHC","authors":"Vineet Kumar, Prashant Shukla","doi":"10.1140/epja/s10050-024-01393-5","DOIUrl":"10.1140/epja/s10050-024-01393-5","url":null,"abstract":"<div><p>In this work, we give a method to study the energy loss of jets in the medium using a variety of jet energy loss observables such as nuclear modification factor and transverse momentum asymmetry in dijets and <span>(gamma )</span>-jets in heavy ion collisions. The energy loss of jets in the medium depends mainly on the size and the properties of medium viz. temperature and is a function of energy of the jets as predicted by various models. A Monte Carlo (MC) method is employed to generate the transverse momentum and path-lengths of the initial jets that undergo energy loss. Using different scenarios of energy loss, the transverse momentum and system size dependence of nuclear modification factors and different measures of dijet momentum imbalance at energies <span>(sqrt{s_{textrm{NN}}})</span> = 2.76 TeV and 5.02 TeV and <span>(gamma )</span>-jet asymmetry at <span>(sqrt{s_{textrm{NN}}})</span> =2.76 TeV in Pb+Pb collisions are simulated. The results are compared with the measurements by ATLAS and CMS experiments as a function of transverse momentum and centrality. The study demonstrates how the system size and energy dependence of jet energy loss can be quantified using various experimental observables.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01393-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
R. Li, N. Sparveris, H. Atac, M. K. Jones, M. Paolone, Z. Akbar, M. Ali, C. Ayerbe Gayoso, V. Berdnikov, D. Biswas, M. Boer, A. Camsonne, J.-P. Chen, M. Diefenthaler, B. Duran, D. Dutta, D. Gaskell, O. Hansen, F. Hauenstein, N. Heinrich, W. Henry, T. Horn, G. M. Huber, S. Jia, S. Joosten, A. Karki, S. J. D. Kay, V. Kumar, X. Li, W. B. Li, A. H. Liyanage, D. Mack, S. Malace, P. Markowitz, M. McCaughan, Z.-E. Meziani, H. Mkrtchyan, C. Morean, M. Muhoza, A. Narayan, B. Pasquini, M. Rehfuss, B. Sawatzky, G. R. Smith, A. Smith, R. Trotta, C. Yero, X. Zheng, J. Zhou
{"title":"Pion electroproduction measurements in the nucleon resonance region","authors":"R. Li, N. Sparveris, H. Atac, M. K. Jones, M. Paolone, Z. Akbar, M. Ali, C. Ayerbe Gayoso, V. Berdnikov, D. Biswas, M. Boer, A. Camsonne, J.-P. Chen, M. Diefenthaler, B. Duran, D. Dutta, D. Gaskell, O. Hansen, F. Hauenstein, N. Heinrich, W. Henry, T. Horn, G. M. Huber, S. Jia, S. Joosten, A. Karki, S. J. D. Kay, V. Kumar, X. Li, W. B. Li, A. H. Liyanage, D. Mack, S. Malace, P. Markowitz, M. McCaughan, Z.-E. Meziani, H. Mkrtchyan, C. Morean, M. Muhoza, A. Narayan, B. Pasquini, M. Rehfuss, B. Sawatzky, G. R. Smith, A. Smith, R. Trotta, C. Yero, X. Zheng, J. Zhou","doi":"10.1140/epja/s10050-024-01391-7","DOIUrl":"10.1140/epja/s10050-024-01391-7","url":null,"abstract":"<div><p>We report new pion electroproduction measurements in the <span>(Delta (1232))</span> resonance, utilizing the SHMS - HMS magnetic spectrometers of Hall C at Jefferson Lab. The data focus on a region that exhibits a strong and rapidly changing interplay of the mesonic cloud and quark-gluon dynamics in the nucleon. The results are in reasonable agreement with models that employ pion cloud effects and chiral effective field theory calculations, but at the same time they suggest that an improvement is required to the theoretical calculations and provide valuable input that will allow their refinements. The data illustrate the potential of the magnetic spectrometers setup in Hall C towards the study the <span>(Delta (1232))</span> resonance. These first reported results will be followed by a series of measurements in Hall C, that will expand the studies of the <span>(Delta (1232))</span> resonance offering a high precision insight within a wide kinematic range from low to high momentum transfers.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
{"title":"Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons","authors":"Shunsuke Endo, Ryota Abe, Hiroyuki Fujioka, Takashi Ino, Osamu Iwamoto, Nobuyuki Iwamoto, Shiori Kawamura, Atsushi Kimura, Masaaki Kitaguchi, Ryuju Kobayashi, Shoji Nakamura, Takayuki Oku, Takuya Okudaira, Mao Okuizumi, Mohamed Omer, Gerard Rovira, Tatsushi Shima, Hirohiko M. Shimizu, Toshiyuki Shizuma, Yoshitaka Taira, Shusuke Takada, Shingo Takahashi, Hiromoto Yoshikawa, Tamaki Yoshioka, Heishun Zen","doi":"10.1140/epja/s10050-024-01392-6","DOIUrl":"10.1140/epja/s10050-024-01392-6","url":null,"abstract":"<div><p>Measurements of circular polarization of <span>(gamma )</span>-ray emitted from neutron capture reactions provide valuable information for nuclear physics studies. The spin and parity of excited states can be determined by measuring the circular polarization from polarized neutron capture reactions. Furthermore, the <span>(gamma )</span>-ray circular polarization in a neutron capture resonance is crucial for studying the enhancement effect of parity nonconservation in compound nuclei. The <span>(gamma )</span>-ray circular polarization can be measured using a polarimeter based on magnetic Compton scattering. A polarimeter was constructed, and its performance indicators were evaluated using a circularly polarized <span>(gamma )</span>-ray beam. Finally, as a demonstration, the <span>(gamma )</span>-ray circular polarization was measured in <sup>32</sup>S(<span>(mathbf {text {n}})</span>,<span>(gamma )</span>)<sup>33</sup>S reactions with polarized neutrons.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
C. Y. Guo, W. Q. Zhang, H. Huang, S. Q. Zhang, Z. H. Li, Z. Liu, H. Hua, D. W. Luo, H. Y. Wu, A. N. Andreyev, D. Seweryniak, B. Andel, S. Antalic, A. E. Barzakh, M. Block, A. Bronis, M. P. Carpenter, P. Copp, J. G. Cubiss, D. T. Doherty, P. Van Duppen, Z. Favier, F. Giacoppo, B. Kindler, F. G. Kondev, T. Lauritsen, X. Q. Li, B. Lommel, M. Al Monthery, P. Mošať, L. Ni, C. Raison, W. Reviol, G. Savard, S. Stolze, G. L. Wilson, C. Xu, J. Z. Zhang, S. Y. Zhang, Z. X. Zhou
{"title":"Spectroscopy of 187Tl: shape coexistence","authors":"C. Y. Guo, W. Q. Zhang, H. Huang, S. Q. Zhang, Z. H. Li, Z. Liu, H. Hua, D. W. Luo, H. Y. Wu, A. N. Andreyev, D. Seweryniak, B. Andel, S. Antalic, A. E. Barzakh, M. Block, A. Bronis, M. P. Carpenter, P. Copp, J. G. Cubiss, D. T. Doherty, P. Van Duppen, Z. Favier, F. Giacoppo, B. Kindler, F. G. Kondev, T. Lauritsen, X. Q. Li, B. Lommel, M. Al Monthery, P. Mošať, L. Ni, C. Raison, W. Reviol, G. Savard, S. Stolze, G. L. Wilson, C. Xu, J. Z. Zhang, S. Y. Zhang, Z. X. Zhou","doi":"10.1140/epja/s10050-024-01395-3","DOIUrl":"10.1140/epja/s10050-024-01395-3","url":null,"abstract":"<div><p>The prompt and delayed <span>(gamma )</span>-ray spectra of <sup>187</sup>Tl was studied via the <sup>142</sup>Nd(<sup>50</sup>Cr, 3<i>p</i>2<i>n</i>)<sup>187</sup>Tl fusion-evaporation reaction at a beam energy of 255 MeV. An enhanced level scheme of <sup>187</sup>Tl was established. The collective bands with one-quasiparticle configurations from the <span>(2f_{7/2})</span>, <span>(1h_{9/2})</span>, <span>(1h_{11/2})</span> and <span>(1i_{13/2})</span> orbitals and high-lying structures with possible three-quasiparticle configurations are investigated in terms of the tilted axis cranking covariant density functional theory. At low excitation energy, the rotational bands with one-quasiparticle configurations reflect coexistence of three shapes: prolate, triaxial, and oblate. The possible shapes of two microsecond isomers at high excitation energy are proposed.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
{"title":"Is there an abrupt fall of spontaneous fission half-lives in 248No and 252Rf?","authors":"I. S. Rogov, G. G. Adamian, N. V. Antonenko","doi":"10.1140/epja/s10050-024-01382-8","DOIUrl":"10.1140/epja/s10050-024-01382-8","url":null,"abstract":"<div><p>Spontaneous fission and <span>(alpha )</span> decay from the ground state of nuclei <sup>248</sup>No and <sup>252</sup>Rf are studied within the dinuclear system model. All these decay processes are considered as the evolution of a nucleus in the charge (mass) asymmetry coordinate. For the even–even and even–odd nobelium and rutherfordium isotopes, the available experimental spontaneous fission and <span>(alpha )</span>-decay half-lives of the ground state are effectively described.\u0000</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
{"title":"Erratum to: Study of spatial structures in (alpha )-cluster nuclei","authors":"V. V. Samarin","doi":"10.1140/epja/s10050-024-01379-3","DOIUrl":"10.1140/epja/s10050-024-01379-3","url":null,"abstract":"","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
{"title":"Nonlinear corrections to the momentum sum rule","authors":"G. R. Boroun","doi":"10.1140/epja/s10050-024-01348-w","DOIUrl":"10.1140/epja/s10050-024-01348-w","url":null,"abstract":"<div><p>The importance of nonlinear corrections to the momentum sum rule is investigated on the initial scale <span>(Q_{0}^2)</span>. Nonlinear corrections are found to play an indispensable role in the singlet and gluon momentum sum rule in the high-order approximations in the parton distribution function parameterizations for nucleons and light nuclei at low <i>x</i> in future colliders. In this way, we obtain a significantly different low <i>x</i> behavior of the singlet and gluon momentum sum rule at the hotspot point.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Anabella Tudora, Dan Mihai Filipescu, Ioana Gheorghe
{"title":"Prompt neutron emission calculations for the photon induced reactions of 238U and 232Th in the giant dipole resonance energy region","authors":"Anabella Tudora, Dan Mihai Filipescu, Ioana Gheorghe","doi":"10.1140/epja/s10050-024-01361-z","DOIUrl":"10.1140/epja/s10050-024-01361-z","url":null,"abstract":"<div><p>Prompt emission calculations for the photon induced fission of <sup>238</sup>U and <sup>232</sup>Th in the GDR energy region were performed by using (a) a systematic of input parameters for the most probable fragmentation approach (obtained on the basis of only spontaneous and neutron induced fission of actinides) and (b) photo-fission cross section ratios (expressing the fission probabilities at incident energies where multiple fission chances are involved) provided by nuclear reaction calculations performed with the EMPIRE code. The prompt neutron emission results describe well the experimental data recently measured at the laser Compton-scattering γ-ray source of the NewSUBARU facility, validating the use of this input parameter systematic for photon induced fission, too. The modelings and procedures described in this paper can constitute an useful tool for the prediction of prompt neutron emission data in photon induced reactions without any experimental information.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01361-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142182437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
{"title":"Examination of static fission properties of (^{236})U and (^{233})Th using Cassinian oval parametrization within the macroscopic–microscopic approach","authors":"P. Jachimowicz, R. Capote, M. Kowal","doi":"10.1140/epja/s10050-024-01381-9","DOIUrl":"10.1140/epja/s10050-024-01381-9","url":null,"abstract":"<div><p>We have conducted a thorough analysis of the potential energy surfaces (PES) in <span>(^{236})</span>U and <span>(^{233})</span>Th using the Cassini-ovals parameterization within the macro–micro approach. We employed the state-of-the-art immersion water flow (IWF) method to study the saddles on four-dimensional energy grids encompassing reflection-asymmetric shapes. For <span>(^{233})</span>Th, we computed the adiabatic potential energy surfaces by minimizing configurations with one blocked neutron within ten levels below and above the Fermi level. Our results show satisfactory agreement with empirical and experimental estimates for both nuclei, specifically regarding the first and second fission barriers. This suggests that our method holds promise in efficiently describing non-compact shapes while reducing the dimensionality of the space without sacrificing accuracy. Interestingly, employing Cassinian oval parameterization fails to reveal a pronounced, hyper-deformed third minimum in the potential energy landscape. Instead, only a shallow third minimum is observed for <span>(^{233})</span>Th, while in <span>(^{236})</span>U, this minimum ultimately vanishes. This finding holds significant importance when considering the modeling of fission cross-sections.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"60 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-024-01381-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
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