Pub Date : 2024-10-08DOI: 10.1016/j.adt.2024.101697
V.V. Varlamov, A.I. Davydov, V.N. Orlin
The well-known significant systematic disagreements between cross sections of partial photoneutron reactions and (γ, 2n) 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.
{"title":"Photonuclear partial reaction cross sections: Systematic uncertainties and reliability","authors":"V.V. Varlamov, A.I. Davydov, 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 <sup>51</sup>V to <sup>209</sup>Bi 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}
Pub Date : 2024-10-04DOI: 10.1016/j.adt.2024.101693
R. Karpuškienė, R. Kisielius
The ab initio 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. 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 , and Landé -factors have been determined for the ground configuration 4p4d and two excited configurations, 4p4d8 and 4p64d64f. The radiative transition wavelengths and emission transition probabilities 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.
{"title":"Theoretical level energies and transition data for 4p64d7, 4p54d8 and 4p64d64f configurations of W31+ ion","authors":"R. Karpuškienė, 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>4d<sup>8</sup> and 4p<sup>6</sup>4d<sup>6</sup>4f. 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}
Pub Date : 2024-10-03DOI: 10.1016/j.adt.2024.101695
David R. Schultz , Boris Pritychenko
{"title":"ADNDT's enduring distinct role in the scientific publishing ecosystem","authors":"David R. Schultz , 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}
Pub Date : 2024-10-02DOI: 10.1016/j.adt.2024.101694
B. Pritychenko , V.I. Tretyak
The double-beta (2)-decay is the rarest nuclear physics process, and its experimental half-lives (T) 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 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.
{"title":"Comprehensive review of 2β decay half-lives","authors":"B. Pritychenko , 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}
Pub Date : 2024-10-02DOI: 10.1016/j.adt.2024.101696
J. Walkowiak , J. Bielecki , J. Bieroń , A. Jardin , Y. Savoye-Peysson , D. Mazon , K. Król , D. Dworak , M. Scholz
The presented work provides values of Mean Excitation Energy (MEE) for all atoms and their ions with atomic numbers . To fill in the gaps in the available data, we propose an approximate atomic model for ions of high-Z elements, that uses a semi-empirical formula based on the Local Plasma Approximation (LPA). Despite the fact that the LPA, in its original form, poorly predicts MEE for high ionization states, a relatively simple modification utilizing a fit function can amend this shortcoming. We assess the importance of relativistic effects for the MEE for highly ionized atoms and compare the proposed formula to other approximations available for high-Z elements. We estimate the uncertainty of the presented data to be less than 40% in absolute value for the worst cases and less than 20% for most ions. This corresponds to an uncertainty of the order of few percent for the logarithm of MEE, which is the value of interest in the case of Bethe’s theory of stopping power.
{"title":"Mean Excitation Energies of all ionization stages of all atoms with 1≤Z≤86","authors":"J. Walkowiak , J. Bielecki , J. Bieroń , A. Jardin , Y. Savoye-Peysson , D. Mazon , K. Król , D. Dworak , M. Scholz","doi":"10.1016/j.adt.2024.101696","DOIUrl":"10.1016/j.adt.2024.101696","url":null,"abstract":"<div><div>The presented work provides values of Mean Excitation Energy (MEE) for all atoms and their ions with atomic numbers <span><math><mrow><mn>1</mn><mo>≤</mo><mi>Z</mi><mo>≤</mo><mn>86</mn></mrow></math></span>. To fill in the gaps in the available data, we propose an approximate atomic model for ions of high-Z elements, that uses a semi-empirical formula based on the Local Plasma Approximation (LPA). Despite the fact that the LPA, in its original form, poorly predicts MEE for high ionization states, a relatively simple modification utilizing a fit function can amend this shortcoming. We assess the importance of relativistic effects for the MEE for highly ionized atoms and compare the proposed formula to other approximations available for high-Z elements. We estimate the uncertainty of the presented data to be less than 40% in absolute value for the worst cases and less than 20% for most ions. This corresponds to an uncertainty of the order of few percent for the logarithm of MEE, which is the value of interest in the case of Bethe’s theory of stopping power.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"161 ","pages":"Article 101696"},"PeriodicalIF":2.7,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757140","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}
Pub Date : 2024-09-26DOI: 10.1016/j.adt.2024.101692
R. Budaca
The yrast parity doublet rotational bands in odd medium mass and heavy nuclei are described by a quadrupole–octupole axially symmetric collective model within the strong coupling assumption regarding the odd nucleon. Energy levels of the same spin and opposite parity are interpreted as symmetric and antisymmetric quantum states of the quadrupole–octupole shape fluctuation. The energy spectrum and the associated electromagnetic transitions of the parity doublet bands observed in 21 selected nuclei, are reproduced with a very good accuracy. Predictions are performed for energies of unobserved states and electromagnetic properties. The model parameters are used to establish the static or dynamic nature of the octupole correlations in the ground state and their evolution with spin. A general systematization of the octupole effects as a function of nucleon numbers is realized in conjunction with results on even–even nuclei.
{"title":"Collective model description of parity-doublet bands in odd mass nuclei","authors":"R. Budaca","doi":"10.1016/j.adt.2024.101692","DOIUrl":"10.1016/j.adt.2024.101692","url":null,"abstract":"<div><div>The yrast parity doublet rotational bands in odd medium mass and heavy nuclei are described by a quadrupole–octupole axially symmetric collective model within the strong coupling assumption regarding the odd nucleon. Energy levels of the same spin and opposite parity are interpreted as symmetric and antisymmetric quantum states of the quadrupole–octupole shape fluctuation. The energy spectrum and the associated electromagnetic transitions of the parity doublet bands observed in 21 selected nuclei, are reproduced with a very good accuracy. Predictions are performed for energies of unobserved states and electromagnetic properties. The model parameters are used to establish the static or dynamic nature of the octupole correlations in the ground state and their evolution with spin. A general systematization of the octupole effects as a function of nucleon numbers is realized in conjunction with results on even–even nuclei.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"161 ","pages":"Article 101692"},"PeriodicalIF":2.7,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757142","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}
Pub Date : 2024-08-31DOI: 10.1016/j.adt.2024.101685
I. Mančev , N. Milojević , D. Delibašić , M. Milenković , Dž. Belkić
<div><p>Single-electron capture by multiply charged nuclei from helium atoms is studied by means of the prior form of the four-body boundary-corrected continuum intermediate state (BCIS-4B) method. Computations concern total cross sections for the state-selective (<span><math><msub><mrow><mi>Q</mi></mrow><mrow><mi>n</mi><mi>l</mi><mi>m</mi></mrow></msub></math></span>) and state-summed (<span><math><mrow><msub><mrow><mi>Q</mi></mrow><mrow><mi>n</mi><mi>l</mi></mrow></msub><mo>,</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>n</mi></mrow></msub><mo>,</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>Σ</mi></mrow></msub></mrow></math></span>) populations at 20–3000 keV/amu. These refer to the collisions of the type <span><math><mrow><msup><mrow><mi>A</mi></mrow><mrow><msub><mrow><mi>Z</mi></mrow><mrow><mi>P</mi></mrow></msub><mo>+</mo></mrow></msup><mo>+</mo><mi>He</mi><mrow><mo>(</mo><mn>1</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>)</mo></mrow><mo>→</mo><msup><mrow><mi>A</mi></mrow><mrow><mrow><mo>(</mo><msub><mrow><mi>Z</mi></mrow><mrow><mi>P</mi></mrow></msub><mo>−</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo></mrow></msup><mrow><mo>(</mo><mi>n</mi><mi>l</mi><mi>m</mi><mo>)</mo></mrow><mo>+</mo><msup><mrow><mi>He</mi></mrow><mrow><mo>+</mo></mrow></msup><mrow><mo>(</mo><mn>1</mn><mi>s</mi><mo>)</mo></mrow></mrow></math></span>. Here, the projectile <span><math><msup><mrow><mi>A</mi></mrow><mrow><msub><mrow><mi>Z</mi></mrow><mrow><mi>P</mi></mrow></msub><mo>+</mo></mrow></msup></math></span> covers the ions <span><math><msup><mrow><mi>H</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>He</mi></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>Li</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>Be</mi></mrow><mrow><mn>4</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>B</mi></mrow><mrow><mn>5</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>C</mi></mrow><mrow><mn>6</mn><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mi>N</mi></mrow><mrow><mn>7</mn><mo>+</mo></mrow></msup></math></span>. The reported findings are tabulated for each value of the quantum numbers <span><math><mrow><mo>{</mo><mi>n</mi><mo>,</mo><mi>l</mi><mo>,</mo><mi>m</mi><mo>}</mo></mrow></math></span>. The maximum values <span><math><msub><mrow><mi>n</mi></mrow><mrow><mo>max</mo></mrow></msub></math></span> of the principal quantum number <span><math><mi>n</mi></math></span> are 4 (<span><math><msup><mrow><mi>H</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>He</mi></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>Li</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>), 5 (<span><math><msup><mrow><mi>Be</mi></mrow><mrow><mn>4</mn><mo>+</mo></mrow></msup></math></span>), 6 (<span><math><msup><mrow><
{"title":"Single-electron capture from helium targets by heavy nuclei of charges 1–7","authors":"I. Mančev , N. Milojević , D. Delibašić , M. Milenković , Dž. Belkić","doi":"10.1016/j.adt.2024.101685","DOIUrl":"10.1016/j.adt.2024.101685","url":null,"abstract":"<div><p>Single-electron capture by multiply charged nuclei from helium atoms is studied by means of the prior form of the four-body boundary-corrected continuum intermediate state (BCIS-4B) method. Computations concern total cross sections for the state-selective (<span><math><msub><mrow><mi>Q</mi></mrow><mrow><mi>n</mi><mi>l</mi><mi>m</mi></mrow></msub></math></span>) and state-summed (<span><math><mrow><msub><mrow><mi>Q</mi></mrow><mrow><mi>n</mi><mi>l</mi></mrow></msub><mo>,</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>n</mi></mrow></msub><mo>,</mo><msub><mrow><mi>Q</mi></mrow><mrow><mi>Σ</mi></mrow></msub></mrow></math></span>) populations at 20–3000 keV/amu. These refer to the collisions of the type <span><math><mrow><msup><mrow><mi>A</mi></mrow><mrow><msub><mrow><mi>Z</mi></mrow><mrow><mi>P</mi></mrow></msub><mo>+</mo></mrow></msup><mo>+</mo><mi>He</mi><mrow><mo>(</mo><mn>1</mn><msup><mrow><mi>s</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>)</mo></mrow><mo>→</mo><msup><mrow><mi>A</mi></mrow><mrow><mrow><mo>(</mo><msub><mrow><mi>Z</mi></mrow><mrow><mi>P</mi></mrow></msub><mo>−</mo><mn>1</mn><mo>)</mo></mrow><mo>+</mo></mrow></msup><mrow><mo>(</mo><mi>n</mi><mi>l</mi><mi>m</mi><mo>)</mo></mrow><mo>+</mo><msup><mrow><mi>He</mi></mrow><mrow><mo>+</mo></mrow></msup><mrow><mo>(</mo><mn>1</mn><mi>s</mi><mo>)</mo></mrow></mrow></math></span>. Here, the projectile <span><math><msup><mrow><mi>A</mi></mrow><mrow><msub><mrow><mi>Z</mi></mrow><mrow><mi>P</mi></mrow></msub><mo>+</mo></mrow></msup></math></span> covers the ions <span><math><msup><mrow><mi>H</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>He</mi></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>Li</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>Be</mi></mrow><mrow><mn>4</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>B</mi></mrow><mrow><mn>5</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>C</mi></mrow><mrow><mn>6</mn><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mi>N</mi></mrow><mrow><mn>7</mn><mo>+</mo></mrow></msup></math></span>. The reported findings are tabulated for each value of the quantum numbers <span><math><mrow><mo>{</mo><mi>n</mi><mo>,</mo><mi>l</mi><mo>,</mo><mi>m</mi><mo>}</mo></mrow></math></span>. The maximum values <span><math><msub><mrow><mi>n</mi></mrow><mrow><mo>max</mo></mrow></msub></math></span> of the principal quantum number <span><math><mi>n</mi></math></span> are 4 (<span><math><msup><mrow><mi>H</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>He</mi></mrow><mrow><mn>2</mn><mo>+</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>Li</mi></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span>), 5 (<span><math><msup><mrow><mi>Be</mi></mrow><mrow><mn>4</mn><mo>+</mo></mrow></msup></math></span>), 6 (<span><math><msup><mrow><","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"160 ","pages":"Article 101685"},"PeriodicalIF":2.7,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142158463","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}
Pub Date : 2024-08-30DOI: 10.1016/j.adt.2024.101684
V.Yu. Denisov
The same alpha-nucleus interaction describes the alpha-decay and alpha-capture reactions in the Unified Model for Alpha-Decay and Alpha-Capture (UMADAC). The data for the ground-state-to-ground-state alpha-transition half-lives in 420 nuclei, the half-lives for alpha-transition from the ground state to the first excited state in 74 even–even nuclei, and the alpha-capture cross sections of 20 spherical and deformed nuclei are used for defining the parameters of the UMADAC. The pointed data are well described in the framework of the UMADAC utilizing the obtained parameters. The ground-state-to-ground-state alpha-transition half-lives in 3802 nuclei with the proton and nucleon numbers in the ranges 50 126 and 97 340 are calculated in the UMADAC and presented in the Table 1. The quadrupole and hexadecapole deformations of the daughter nucleus are considered in the UMADAC. The minimal values of the orbital momenta of the alpha-transition between the ground states are found using available experimental and theoretical data for the ground state spin and parity values of nuclei. The half-lives for 223 alpha-transitions from the ground-state of the parent even–even nuclei to the lowest state of the daughter nuclei with the proton and nucleon numbers in the ranges 52 102 and 108 254 are obtained in the UMADAC and given in the Table 2.
{"title":"Alpha-decay half-lives and alpha-capture cross-sections","authors":"V.Yu. Denisov","doi":"10.1016/j.adt.2024.101684","DOIUrl":"10.1016/j.adt.2024.101684","url":null,"abstract":"<div><div>The same alpha-nucleus interaction describes the alpha-decay and alpha-capture reactions in the Unified Model for Alpha-Decay and Alpha-Capture (UMADAC). The data for the ground-state-to-ground-state alpha-transition half-lives in 420 nuclei, the half-lives for alpha-transition from the ground state to the first excited <span><math><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> state in 74 even–even nuclei, and the alpha-capture cross sections of 20 spherical and deformed nuclei are used for defining the parameters of the UMADAC. The pointed data are well described in the framework of the UMADAC utilizing the obtained parameters. The ground-state-to-ground-state alpha-transition half-lives in 3802 nuclei with the proton <span><math><mi>Z</mi></math></span> and nucleon <span><math><mi>A</mi></math></span> numbers in the ranges 50 <span><math><mrow><mo>≤</mo><mi>Z</mi><mo>≤</mo></mrow></math></span> 126 and 97 <span><math><mrow><mo>≤</mo><mi>A</mi><mo>≤</mo></mrow></math></span> 340 are calculated in the UMADAC and presented in the <span><span>Table 1</span></span>. The quadrupole and hexadecapole deformations of the daughter nucleus are considered in the UMADAC. The minimal values of the orbital momenta of the alpha-transition between the ground states are found using available experimental and theoretical data for the ground state spin and parity values of nuclei. The half-lives for 223 alpha-transitions from the ground-state of the parent even–even nuclei to the lowest <span><math><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> state of the daughter nuclei with the proton <span><math><mi>Z</mi></math></span> and nucleon <span><math><mi>A</mi></math></span> numbers in the ranges 52 <span><math><mrow><mo>≤</mo><mi>Z</mi><mo>≤</mo></mrow></math></span> 102 and 108 <span><math><mrow><mo>≤</mo><mi>A</mi><mo>≤</mo></mrow></math></span> 254 are obtained in the UMADAC and given in the <span><span>Table 2</span></span>.</div></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"161 ","pages":"Article 101684"},"PeriodicalIF":2.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757073","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}
Pub Date : 2024-08-17DOI: 10.1016/j.adt.2024.101683
M. Klempka , J. Ruczkowski , M. Elantkowska
The values of the radiative parameters for atomic cobalt were determined using a semi-empirical method. The eigenvector amplitudes determined in our previously published research were adopted. In most cases, the calculated values of the oscillator strengths and radiative lifetimes agree well with the experimental data. Predictions of the values of the radiative parameters are also provided.
{"title":"Semi-empirical determination of radiative parameters for atomic cobalt","authors":"M. Klempka , J. Ruczkowski , M. Elantkowska","doi":"10.1016/j.adt.2024.101683","DOIUrl":"10.1016/j.adt.2024.101683","url":null,"abstract":"<div><p>The values of the radiative parameters for atomic cobalt were determined using a semi-empirical method. The eigenvector amplitudes determined in our previously published research were adopted. In most cases, the calculated values of the oscillator strengths and radiative lifetimes agree well with the experimental data. Predictions of the values of the radiative parameters are also provided.</p></div>","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"160 ","pages":"Article 101683"},"PeriodicalIF":2.7,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142158491","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}
Pub Date : 2024-08-05DOI: 10.1016/j.adt.2024.101682
N. Nica
<div><p>We revisit the principles underlying high-spin level schemes, using the case of <sup>171</sup>Yb as an example. We first introduce the least-squares fit of the experimental <span><math><mi>γ</mi></math></span>-ray energy bands vs spin as a family of straight lines, <span><math><mrow><mn>2</mn><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>I</mi><mo>+</mo><mi>k</mi><mo>−</mo><mn>1</mn><mo>)</mo></mrow></mrow></math></span>. The fit captures the average rotational phenomenology of all the bands. The constant <span><math><mrow><mn>2</mn><mi>c</mi></mrow></math></span> average slope is the inverse of the effective moment of inertia <span><math><mrow><msubsup><mrow><mi>ℑ</mi></mrow><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow><mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></mrow></msubsup><mo>=</mo><msup><mrow><mo>ħ</mo></mrow><mrow><mn>2</mn></mrow></msup><mo>/</mo><mn>2</mn><mi>c</mi></mrow></math></span>. The inclusion of the additional integer parameter <span><math><mi>k</mi></math></span> transforms the Bohr–Mottelson ideal rotor into a double helix structure that can accommodate all combinations of spin, parity, and signature quantum numbers for the rotational levels. Finally, the experimental <span><math><mi>γ</mi></math></span>-ray energies can be parametrized as <span><math><mrow><mn>2</mn><msub><mrow><mi>c</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow></msub><mrow><mo>(</mo><mn>2</mn><mi>I</mi><mo>+</mo><mi>k</mi><mo>+</mo><msup><mrow><mi>k</mi></mrow><mrow><mo>′</mo></mrow></msup><mo>−</mo><mn>1</mn><mo>)</mo></mrow></mrow></math></span>, where the additional integer <span><math><msup><mrow><mi>k</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> contains the deviations of <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>γ</mi></mrow></msub></math></span> values from the fit lines and <span><math><msub><mrow><mi>c</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow></msub></math></span> is the band inertial parameter, which determines the band moments of inertia, <span><math><mrow><msubsup><mrow><mi>ℑ</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow><mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></mrow></msubsup><mo>=</mo><msup><mrow><mo>ħ</mo></mrow><mrow><mn>2</mn></mrow></msup><mo>/</mo><mn>2</mn><msub><mrow><mi>c</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow></msub></mrow></math></span>. The new <span><math><mrow><msub><mrow><mi>E</mi></mrow><mrow><mi>γ</mi></mrow></msub><mo>=</mo><mn>2</mn><msub><mrow><mi>c</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow></msub><mrow><mo>(</mo><mn>2</mn><mi>I</mi><mo>+</mo><mi>k</mi><mo>+</mo><msup><mrow><mi>k</mi></mrow><mrow><mo>′</mo></mrow></msup><mo>−</mo><mn>1</mn><mo>)</mo></mrow></mrow></math></span> parametrization leads to a natural <span><math><mrow><mn>3</mn><mi>D</mi></mrow></math></span> representation of the <sup>171</sup>Yb rotational bands as paths on the double helix structure. These paths contain
{"title":"Double helix level scheme of 171Yb nucleus","authors":"N. Nica","doi":"10.1016/j.adt.2024.101682","DOIUrl":"10.1016/j.adt.2024.101682","url":null,"abstract":"<div><p>We revisit the principles underlying high-spin level schemes, using the case of <sup>171</sup>Yb as an example. We first introduce the least-squares fit of the experimental <span><math><mi>γ</mi></math></span>-ray energy bands vs spin as a family of straight lines, <span><math><mrow><mn>2</mn><mi>c</mi><mrow><mo>(</mo><mn>2</mn><mi>I</mi><mo>+</mo><mi>k</mi><mo>−</mo><mn>1</mn><mo>)</mo></mrow></mrow></math></span>. The fit captures the average rotational phenomenology of all the bands. The constant <span><math><mrow><mn>2</mn><mi>c</mi></mrow></math></span> average slope is the inverse of the effective moment of inertia <span><math><mrow><msubsup><mrow><mi>ℑ</mi></mrow><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow><mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></mrow></msubsup><mo>=</mo><msup><mrow><mo>ħ</mo></mrow><mrow><mn>2</mn></mrow></msup><mo>/</mo><mn>2</mn><mi>c</mi></mrow></math></span>. The inclusion of the additional integer parameter <span><math><mi>k</mi></math></span> transforms the Bohr–Mottelson ideal rotor into a double helix structure that can accommodate all combinations of spin, parity, and signature quantum numbers for the rotational levels. Finally, the experimental <span><math><mi>γ</mi></math></span>-ray energies can be parametrized as <span><math><mrow><mn>2</mn><msub><mrow><mi>c</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow></msub><mrow><mo>(</mo><mn>2</mn><mi>I</mi><mo>+</mo><mi>k</mi><mo>+</mo><msup><mrow><mi>k</mi></mrow><mrow><mo>′</mo></mrow></msup><mo>−</mo><mn>1</mn><mo>)</mo></mrow></mrow></math></span>, where the additional integer <span><math><msup><mrow><mi>k</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> contains the deviations of <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>γ</mi></mrow></msub></math></span> values from the fit lines and <span><math><msub><mrow><mi>c</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow></msub></math></span> is the band inertial parameter, which determines the band moments of inertia, <span><math><mrow><msubsup><mrow><mi>ℑ</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow><mrow><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow></mrow></msubsup><mo>=</mo><msup><mrow><mo>ħ</mo></mrow><mrow><mn>2</mn></mrow></msup><mo>/</mo><mn>2</mn><msub><mrow><mi>c</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow></msub></mrow></math></span>. The new <span><math><mrow><msub><mrow><mi>E</mi></mrow><mrow><mi>γ</mi></mrow></msub><mo>=</mo><mn>2</mn><msub><mrow><mi>c</mi></mrow><mrow><mi>b</mi><mi>a</mi><mi>n</mi><mi>d</mi></mrow></msub><mrow><mo>(</mo><mn>2</mn><mi>I</mi><mo>+</mo><mi>k</mi><mo>+</mo><msup><mrow><mi>k</mi></mrow><mrow><mo>′</mo></mrow></msup><mo>−</mo><mn>1</mn><mo>)</mo></mrow></mrow></math></span> parametrization leads to a natural <span><math><mrow><mn>3</mn><mi>D</mi></mrow></math></span> representation of the <sup>171</sup>Yb rotational bands as paths on the double helix structure. These paths contain","PeriodicalId":55580,"journal":{"name":"Atomic Data and Nuclear Data Tables","volume":"160 ","pages":"Article 101682"},"PeriodicalIF":2.7,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142158507","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}
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