Atomic Data and Nuclear Data Tables最新文献

{"title":"Investigation of α-particle states of 8Be and 12C Nuclei in photonuclear reactions on 12C, 14N and 16O nuclei","authors":"S.N. Afanasiev ,&nbsp;I.O. Afanasieva","doi":"10.1016/j.adt.2025.101716","DOIUrl":"10.1016/j.adt.2025.101716","url":null,"abstract":"<div><div>The method of diffusion chamber in the magnetic field making use of a bremsstrahlung beam with a maximum photon energy of 150 MeV is applied to study the reactions of multiparticle photodisintegration of ¹²C, ¹⁴N and ¹⁶O nuclei with the formation of several α-particles in the final state (¹²С(γ,3α), ¹⁶O(γ,4α) і ¹⁴N(γ,np)3α). An experimental complex with a digital data bank of stereo frames and a set of graphic programs that allows to restore events and carry out physical analysis of the obtained data is created. The distribution of events in regard of the excitation energy of the subsystem of two alpha particles has been measured. For all three reactions, the resonance is found which is identified as the ground state of the ⁸Be nucleus and the partial channels for the formation of this state have been separated (¹²C(γ,α)⁸Be₀, ¹⁶O(γ,2α)⁸Be₀ and ¹⁴N(γ,np)α⁸Be₀). For the channels ¹²С(γ,α)⁸Be₀ and ¹⁶О(γ,2α)⁸Be₀, the partial cross-sections are measured. The dependences demonstrate the presence of four maxima, whose positions coincide for both reactions. The rcorrelation between the energy E_γ corresponding to the cross-section maximum and the excitation energy E₀ of ⁸Be nucleus is determined as E_γ – Q = E₀, where Q are the threshold values. The obtained results are qualitatively explained in the framework of the model which describes the absorption of a γ-quantum by a virtual α-particle pair. For the channels ¹⁶О(γ,2α)⁸Be₀ and ¹⁴N(γ,np)α⁸Be₀ the distribution of the excitation energy of three α-particles is measured. The maximum is found in the near-threshold 3α-particle region. This maximum can correspond to the Hoyle state of ¹²C nucleus. Events corresponding to the partial channel of the ¹⁴N((γ,np)¹²C*(0⁺) reaction with the subsequent two-particle decay ¹²C→α+⁸Be*(0⁺) are separated, and the energy and angular distributions of α-particles at each decay stage are analyzed. The channel of ¹²C nucleus formation in the Hoyle state in photonuclear reactions has not been identified earlier.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"163 ","pages":"Article 101716"},"PeriodicalIF":2.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579100","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":"Tables of neutron thermal cross sections, Westcott factors, resonance integrals, Maxwellian averaged cross sections, astrophysical reaction rates, and r-process abundances calculated from the ENDF/B-VIII.1, JEFF-3.3, JENDL-5.0, BROND-3.1, and CENDL-3.2 evaluated data libraries","authors":"B. Pritychenko","doi":"10.1016/j.adt.2025.101708","DOIUrl":"10.1016/j.adt.2025.101708","url":null,"abstract":"<div><div>We present calculations of neutron thermal cross sections, Westcott factors, resonance integrals, Maxwellian-averaged cross sections, astrophysical reaction rates, and solar system <span><math><mi>r</mi></math></span>-process abundances using the latest data from the major evaluated nuclear libraries for 849 ENDF target materials. The recent release of ENDF/B-VIII.1 library, progress in ²⁵²Cf(SF) evaluation, extensive analysis of newly-evaluated neutron reaction cross sections, neutron covariances, and improvements in data processing techniques motivated us to calculate the nuclear industry and neutron physics parameters, produce <span><math><mi>s</mi></math></span>-process Maxwellian-averaged cross sections and astrophysical reaction rates, extract <span><math><mi>r</mi></math></span>-process abundances, systematically calculate uncertainties, and provide additional insights on currently available neutron-induced reaction data.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"163 ","pages":"Article 101708"},"PeriodicalIF":2.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579098","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":"Theoretical Study on the Infrared and Ultraviolet Spectroscopy of PO+","authors":"Guosen Wang ,&nbsp;Chuanyu Zhang ,&nbsp;Xinlu Cheng ,&nbsp;Hong Zhang","doi":"10.1016/j.adt.2025.101721","DOIUrl":"10.1016/j.adt.2025.101721","url":null,"abstract":"<div><div>In this study, the potential energy function, dipole moment function, and transition dipole moment function of the PO⁺ are computed employing high-precision multi-reference configuration interaction methods. By solving the one-dimensional Schrödinger equation for the nuclei, vibrational and rotational energy levels of eight bound states are obtained, subsequently enabling the calculation of the partition function for the PO⁺ molecule. Combining the partition function with the dipole moment function and transition dipole moment function, spectral lines for the PO⁺ molecule in both the infrared and ultraviolet ranges are computed. The spectral lines in the infrared range primarily originate from vibrational-rotational transitions associated with the <span><math><mrow><msup><mrow><mi>X</mi></mrow><mn>1</mn></msup><msup><mrow><mstyle><mi>Σ</mi></mstyle></mrow><mo>+</mo></msup></mrow></math></span> state, while the spectral lines in the ultraviolet range mainly arise from transitions involving the <span><math><mrow><msup><mrow><mi>X</mi></mrow><mn>1</mn></msup><msup><mrow><mstyle><mi>Σ</mi></mstyle></mrow><mo>+</mo></msup><mo>↔</mo><msup><mrow><mi>C</mi></mrow><mn>1</mn></msup><mstyle><mi>Π</mi></mstyle></mrow></math></span>. At 296 K, the most intense spectral lines in the infrared range are generated by the 0–0 vibrational band(<span><math><mrow><msup><mi>v</mi><mo>′</mo></msup><mo>=</mo><mn>0</mn><mo>,</mo><msup><mi>v</mi><mrow><mo>″</mo></mrow></msup><mo>=</mo><mn>0</mn></mrow></math></span>), while the most intense spectral lines in the ultraviolet range are produced by the 2–0 vibrational band(<span><math><mrow><msup><mi>v</mi><mo>′</mo></msup><mo>=</mo><mn>2</mn><mo>,</mo><msup><mi>v</mi><mrow><mo>″</mo></mrow></msup><mo>=</mo><mn>0</mn></mrow></math></span>). At elevated temperatures, the overall intensity of spectral lines decreases as more energy levels are excited, and the central positions of spectral peaks undergo shifts. This study extensively computed the spectral line data for the PO⁺ molecule, providing crucial data support for astronomical observations.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"163 ","pages":"Article 101721"},"PeriodicalIF":2.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143579101","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":"Fine structure transitions with spectral features in Fe V and Fe VI","authors":"Sultana N. Nahar","doi":"10.1016/j.adt.2024.101700","DOIUrl":"10.1016/j.adt.2024.101700","url":null,"abstract":"<div><div>An extensive set of E1 transitions with spectral features for Fe V obtained using relativistic Breit–Pauli R-matrix (BPRM) method is presented. The results correspond to a larger amount of atomic data and of higher accuracy in comparison to the earlier R-matrix results. We report 1,712,655 transitions among 4300 fine structure levels with <span><math><mrow><mi>j</mi><mo>≤</mo><mn>10</mn></mrow></math></span>, <span><math><mrow><mn>2</mn><mi>S</mi><mo>+</mo><mn>1</mn><mo>=</mo></mrow></math></span> 5, 3, 1, <span><math><mrow><mi>L</mi><mo>≤</mo></mrow></math></span> 10, of even and odd parities of n <span><math><mrow><mo>≤</mo><mn>10</mn></mrow></math></span> and <span><math><mrow><mi>l</mi><mo>≤</mo><mn>9</mn></mrow></math></span>. The close coupling wavefunction expansion of Fe V includes ground and 18 excited levels of the core ion Fe VI. The theoretical spectroscopy of the fine structure levels for unique identifications was carried out using an algorithm based on quantum defect theory and angular algebra. The completeness of the calculated data sets is verified for all possible bound levels belonging to the relevant <span><math><mrow><mi>L</mi><mi>S</mi></mrow></math></span> terms. The energies are in very good agreement with measured values within a few percent for most levels. Comparison of transition parameters and lifetimes also indicate general agreement with others. The present data processed for spectral features that show the detectability of Fe V is well within range of James Webb Space Telescope and other observatories. The present results for Fe VI, obtained from relativistic atomic structure calculations in Breit–Pauli approximation using code SUPERSTRUCTURE, include allowed E1 and forbidden E2, M1, E3, M2 transitions, 506,512 in total among 1021 energy levels, bound and continuum. Calculations show much larger number of bound levels of configurations of <span><math><mrow><mn>3</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mn>3</mn><msup><mrow><mi>p</mi></mrow><mrow><mn>5</mn></mrow></msup><mn>3</mn><msup><mrow><mi>d</mi></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span> than those listed at NIST compilation table. The calculations included an optimized set of 9 configurations with orbitals going up to 4f. Comparison of energies, oscillator strengths, lifetimes with available values show good agreement although some large differences are also noted. In contrast to Fe V, the spectral features of Fe VI show three regions of strong lines in the soft-xray to ultraviolet wavelengths.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"162 ","pages":"Article 101700"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095851","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":"Matrix elements for spin-orbit couplings in KRb","authors":"P. Jasik ,&nbsp;D. Kȩdziera ,&nbsp;J.E. Sienkiewicz","doi":"10.1016/j.adt.2024.101698","DOIUrl":"10.1016/j.adt.2024.101698","url":null,"abstract":"<div><div>In response to the need to investigate and create a reliable dataset of spin-orbit coupling matrix elements, we have extended our recent work in which we presented results for the potential energy curves and permanent and transition dipole moments in KRb. This paper presents 190 allowed spin-orbit couplings between 30 singlet and triplet <span><math><msup><mrow><mi>Σ</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span>, <span><math><mi>Π</mi></math></span>, and <span><math><mi>Δ</mi></math></span> electronic states of the KRb molecule. These results are crucial for accurately interpreting spectroscopic data, especially for the deperturbation analysis challenges. 23 tables and 21 graphs present the <span><math><mrow><mi>L</mi><mi>S</mi><mi>X</mi></mrow></math></span>, <span><math><mrow><mi>L</mi><mi>S</mi><mi>Y</mi></mrow></math></span> <!--> <!-->, and <span><math><mrow><mi>L</mi><mi>S</mi><mi>Z</mi></mrow></math></span> components of reported spin-orbit couplings. Using the MOLPRO code, we performed MRCI calculations using the large-core pseudopotentials and core polarization potentials with reoptimized cutoff parameters. The spin-orbit parameters of the potassium pseudopotential were deduced and optimized from scratch. The Gaussian basis sets used in our calculations were appropriately selected, augmented, and optimized. We compare some of our data with available theoretical and experimental results.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"162 ","pages":"Article 101698"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095847","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":"Subshell gaps and onsets of collectivity from proton and neutron pairing gap correlations","authors":"José Nicolás Orce","doi":"10.1016/j.adt.2024.101699","DOIUrl":"10.1016/j.adt.2024.101699","url":null,"abstract":"<div><div>Throughout the nuclear chart, particle-hole correlations give rise to giant resonances and, together with the proton–neutron interaction, deformation and rotational bands. In order to shed light on many-body correlations in open-shell nuclei, I explore macroscopic properties that could manifest from the collective behaviour of protons and neutrons. Intuitively, the correlation of proton and neutron Cooper pairs can be inferred from the respective pairing gaps, that can precisely be extracted from the AME 2020 atomic mass evaluation through odd-even atomic mass differences. This work shows that the combination of large and close-lying proton and neutron pairing gaps is sensitive to onsets of collectivity and subshell gaps in superfluid nuclei, away from major shell closures. Trends of reduced transition probabilities or B(E2) values — which describe the collective overlap between the wave functions of initial and final nuclear states — are revealed in overall agreement with data. Specially interesting is the peak of collectivity in the tin isotopes at ¹¹⁰Sn, instead of at midshell, as expected by large-scale shell-model calculations; a situation that has astounded the nuclear physics community for quite some time.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"162 ","pages":"Article 101699"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095846","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":"Photonuclear partial reaction cross sections: Systematic uncertainties and reliability","authors":"V.V. Varlamov,&nbsp;A.I. Davydov,&nbsp;V.N. Orlin","doi":"10.1016/j.adt.2024.101697","DOIUrl":"10.1016/j.adt.2024.101697","url":null,"abstract":"<div><div>The well-known significant systematic disagreements between cross sections of partial photoneutron reactions <span><math><mrow><mo>(</mo><mrow><mi>γ</mi><mo>,</mo><mn>1</mn><mi>n</mi></mrow><mo>)</mo></mrow></math></span> and (<em>γ</em>, 2<em>n</em>) obtained in various experiments majority of which have been carried out at Livermore (USA) and Saclay (France) were analyzed using the objective physical criteria of data reliability. It was found that experimental data for more than 50 nuclei from ⁵¹V to ²⁰⁹Bi in general do not meet those criteria and therefore are more or less unreliable. The experimental-theoretical method based on the Combined PhotoNuclear Reaction Model (CPNRM) was used to evaluate partial reaction cross sections that meet the reliability criteria. It was shown using the analysis in detail of differences between evaluated and experimental cross sections that the major sources of large systematic uncertainties in obtained cross sections are certain shortcomings of experimental neutron multiplicity sorting method have been used for indirect separation of partial reactions. It was shown that the newly evaluated cross sections of partial photoneutron reactions differ significantly (at least noticeably) from the ones obtained using the method of neutron multiplicity sorting but agree with experimental data obtained by alternative methods used for reliable direct separation of partial reactions. The consolidated review of many problems with partial photoneutron reaction experimental data reliability and some ways to solve ones are presented.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"161 ","pages":"Article 101697"},"PeriodicalIF":2.7,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757143","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":"Theoretical level energies and transition data for 4p64d7, 4p54d8 and 4p64d64f configurations of W31+ ion","authors":"R. Karpuškienė,&nbsp;R. Kisielius","doi":"10.1016/j.adt.2024.101693","DOIUrl":"10.1016/j.adt.2024.101693","url":null,"abstract":"<div><div>The <em>ab initio</em> quasirelativistic approach developed specifically for the calculation of spectral parameters of highly charged ions has been used to determine transition data for the Tc-like tungsten ion W<span><math><msup><mrow></mrow><mrow><mn>31</mn><mo>+</mo></mrow></msup></math></span>. This is the final paper of our studies examining spectroscopic properties of the tungsten ions with open 4d shell in the ground state. The configuration interaction method has been utilized to include electron correlation effects. The relativistic effects have been taken into account in the Breit–Pauli approximation. Level energies, their radiative lifetimes <span><math><mi>τ</mi></math></span>, and Landé <span><math><mi>g</mi></math></span>-factors have been determined for the ground configuration 4p<span><math><msup><mrow></mrow><mrow><mn>6</mn></mrow></msup></math></span>4d<span><math><msup><mrow></mrow><mrow><mn>7</mn></mrow></msup></math></span> and two excited configurations, 4p<span><math><msup><mrow></mrow><mrow><mn>5</mn></mrow></msup></math></span>4d⁸ and 4p⁶4d⁶4f. The radiative transition wavelengths <span><math><mi>λ</mi></math></span> and emission transition probabilities <span><math><mi>A</mi></math></span> for the electric dipole, electric quadrupole, electric octupole, magnetic dipole, and magnetic quadrupole transitions among the fine-structure levels of these configurations have been computed and analyzed. The uncertainties of produced spectroscopic parameters have been evaluated.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"161 ","pages":"Article 101693"},"PeriodicalIF":2.7,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757137","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":"ADNDT's enduring distinct role in the scientific publishing ecosystem","authors":"David R. Schultz ,&nbsp;Boris Pritychenko","doi":"10.1016/j.adt.2024.101695","DOIUrl":"10.1016/j.adt.2024.101695","url":null,"abstract":"","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"161 ","pages":"Article 101695"},"PeriodicalIF":2.7,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757139","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":"Comprehensive review of 2β decay half-lives","authors":"B. Pritychenko ,&nbsp;V.I. Tretyak","doi":"10.1016/j.adt.2024.101694","DOIUrl":"10.1016/j.adt.2024.101694","url":null,"abstract":"<div><div>The double-beta (2<span><math><mi>β</mi></math></span>)-decay is the rarest nuclear physics process, and its experimental half-lives (T<span><math><msub><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span>) exceed the age of the Universe from nine to fourteen orders of magnitude. Double-beta decay was observed, and its half-life was measured in 14 parent nuclei using direct, radiochemical, and geochemical methods. The decay observables are analyzed using the Evaluated Nuclear Structure Data File (ENSDF) procedures, and the recommended T<span><math><msub><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> were deduced. Using the calculated values of phase factors, the effective nuclear matrix elements were extracted and compared with available data. Thousands of theoretical and experimental works have been dedicated to these topics in the last 85 years, and we present two data sets of recommended values to encapsulate the results.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"161 ","pages":"Article 101694"},"PeriodicalIF":2.7,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757138","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}