Nuclear Physics A最新文献

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Description of intruder levels in the 162,164,166Dy nuclei by two different algebraic approaches 用两种不同的代数方法描述 162、164、166Dy 核中的入侵者水平
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-12-06 DOI: 10.1016/j.nuclphysa.2023.122811
Z. Jahangiri tazekand, H. Sabri
{"title":"Description of intruder levels in the 162,164,166Dy nuclei by two different algebraic approaches","authors":"Z. Jahangiri tazekand,&nbsp;H. Sabri","doi":"10.1016/j.nuclphysa.2023.122811","DOIUrl":"10.1016/j.nuclphysa.2023.122811","url":null,"abstract":"<div><p>In this paper, we tried to describe both normal and intruder levels of the ground and first excited beta and gamma rotational bands of <sup>162,164,166</sup><span><span>Dy deformed nuclei in the framework of the interacting boson model. A normal Hamiltonian of SU(3) dynamical symmetry limit is extended by adding a 2p-2 h excitation term. Also, the results are compared with the predictions of the partial dynamical symmetry for these levels of considered nuclei. The results show that, this extension removes the degeneracy suggested by the pure SU(3) symmetry and makes satisfactory agreement with the experimental counterparts for the energy levels, too. Also, a comparison between the results of this extended formalism and partial dynamical symmetry shows the advantages of the first one in the description of intruder levels, whereas the latter, makes exact results for the normal energy levels of beta and gamma energy bands. The predictions of pure SU(3), partial dynamical symmetry SU(3) and mixed formalism for different </span>quadrupole transition rates between normal and intruder levels of this nucleus are compared with the predictions of pseudo-SU(3) model and the advantages of each model have explained in detail.</span></p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138552374","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
Tensor and isovector–isoscalar terms of relativistic mean field model: Impacts on neutron-skin thickness, charge radius, and nuclear matter 相对论平均场模型的张量和等矢量等标量项:对中子蒙皮厚度、电荷半径和核物质的影响
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-12-06 DOI: 10.1016/j.nuclphysa.2023.122812
N. Liliani , A.M. Nugraha , J.P. Diningrum , A. Sulaksono
{"title":"Tensor and isovector–isoscalar terms of relativistic mean field model: Impacts on neutron-skin thickness, charge radius, and nuclear matter","authors":"N. Liliani ,&nbsp;A.M. Nugraha ,&nbsp;J.P. Diningrum ,&nbsp;A. Sulaksono","doi":"10.1016/j.nuclphysa.2023.122812","DOIUrl":"10.1016/j.nuclphysa.2023.122812","url":null,"abstract":"<div><p>The origin of the neutron skin thickness, measured by the CREX and PREX collaborations as thin for <sup>40</sup>Ca and thick for <sup>28</sup><span>Pb, remains a mystery. We investigate the effects of tensor and nonlinear isovector–isoscalar terms in a relativistic mean-field model (RMF) on the properties of finite nuclei and nuclear matter. Tensor couplings are crucial for better quality binding energies of finite nuclei and charge radii for relatively heavy nuclei. However, for light nuclei, the tensor terms cannot improve the compatibility of charge radius predictions by the RMF model with experimental data. We find that parameter sets with a larger nonlinear isovector–isoscalar parameter, particularly </span><span><math><msub><mrow><mi>η</mi></mrow><mrow><mn>2</mn><mi>ρ</mi></mrow></msub></math></span> = 0.028, agree better with experimental data for Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> across light, medium, and heavy isotope chains. Using PT28, we calculate Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> for <sup>208</sup>Pb as 0.214 fm, <em>J</em> as 33.078, and <em>L</em> as 58.426. Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> for <sup>208</sup>Pb obtained using PT28 is consistent with the PREX-II data. Moreover, the corresponding values of <em>J</em> and <em>L</em> agree with the low <em>L</em> constraints. Meanwhile, the canonical mass radius predicted by PT28 aligns with the mass and radius data from the NICER collaboration. The combination of tensor and nonlinear isovector–isoscalar couplings in the RMF model provides accurate predictions for finite nuclei binding energies and relatively heavy nuclei charge radii, resulting in relatively thick Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> values for <sup>208</sup>Pb without substantial <em>L</em> values.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534019","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
Comprehension of breakup fusion reactions using forward recoil range distribution measurements 利用前向后坐力范围分布测量来理解分解聚变反应
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-12-02 DOI: 10.1016/j.nuclphysa.2023.122809
Suhail A. Tali , Harish Kumar , M. Afzal Ansari , D. Singh , Rahbar Ali , Pankaj K. Giri , Sneha B. Linda , Amritraj Mahato , Nabendu Kumar Deb , R. Kumar , R.N. Ali
{"title":"Comprehension of breakup fusion reactions using forward recoil range distribution measurements","authors":"Suhail A. Tali ,&nbsp;Harish Kumar ,&nbsp;M. Afzal Ansari ,&nbsp;D. Singh ,&nbsp;Rahbar Ali ,&nbsp;Pankaj K. Giri ,&nbsp;Sneha B. Linda ,&nbsp;Amritraj Mahato ,&nbsp;Nabendu Kumar Deb ,&nbsp;R. Kumar ,&nbsp;R.N. Ali","doi":"10.1016/j.nuclphysa.2023.122809","DOIUrl":"10.1016/j.nuclphysa.2023.122809","url":null,"abstract":"<div><p>To understand the break-up fusion reaction dynamics, the forward recoil range distribution (FRRD) measurements of <sup>12</sup>C + <sup>165</sup>Ho system at the incident projectile energy of ≈ 88 MeV has been performed. The recoil catcher activation technique followed by the off-line gamma ray spectroscopy was implemented. It is observed that the FRRD measurements of the evaporation residues (ERs) populated via xn and pxn channels have a single Guassian peak at large cumulative thickness. This is attributed to complete momentum transfer from the projectile to the target nucleus. However, in case of the FRRD measurements of the ERs populated via αxn, αpxn and 2αxn emitting channels, in addition to peak corresponding to complete momentum transfer, the Gaussian peaks at lower cumulative thicknesses are also observed. This is accredited to the breakup fusion. Moreover, the effect of projectile breakup on complete fusion cross section is also studied. The suppression in fusion cross section is observed when compared with the universal fusion function, thus indicating the breakup probability of <sup>12</sup>C projectile.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534001","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
Large-scale shell-model study of two-neutrino double beta decay of 82Se, 94Zr, 108Cd, 124Sn, 128Te, 130Te, 136Xe, and 150Nd 82Se, 94Zr, 108Cd, 124Sn, 128Te, 130Te, 136Xe和150Nd双中微子双β衰变的大尺度壳层模型研究
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-12-01 DOI: 10.1016/j.nuclphysa.2023.122808
Deepak Patel , Praveen C. Srivastava , V.K.B. Kota , R. Sahu
{"title":"Large-scale shell-model study of two-neutrino double beta decay of 82Se, 94Zr, 108Cd, 124Sn, 128Te, 130Te, 136Xe, and 150Nd","authors":"Deepak Patel ,&nbsp;Praveen C. Srivastava ,&nbsp;V.K.B. Kota ,&nbsp;R. Sahu","doi":"10.1016/j.nuclphysa.2023.122808","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122808","url":null,"abstract":"<div><p>Large-scale shell-model calculations have been performed for the study of two-neutrino double-beta (<span><math><mn>2</mn><mi>ν</mi><mi>β</mi><mi>β</mi></math></span>) decay in <sup>82</sup>Se, <sup>94</sup>Zr, <sup>108</sup>Cd, <sup>124</sup>Sn, <sup>128</sup>Te, <sup>130</sup>Te, <sup>136</sup>Xe, and <sup>150</sup>Nd. We have employed JUN45 interaction to calculate the nuclear matrix element (NME) for <span><math><mn>2</mn><mi>ν</mi><mi>β</mi><mi>β</mi></math></span> decay in <sup>82</sup>Se. In the case of <sup>94</sup>Zr, the glekpn effective interaction is used. For <sup>108</sup>Cd, we have used a realistic effective interaction derived through the G-matrix approach. In the case of <sup>124</sup>Sn, <sup>128,130</sup>Te and <sup>136</sup>Xe, the sn100pn effective interaction is employed. For <sup>150</sup>Nd, we have used KHHE effective interaction based on holes in a <sup>208</sup>Pb core. We have extracted the half-lives of these nuclei for the <span><math><mn>2</mn><mi>ν</mi><mi>β</mi><mi>β</mi></math></span> decay with the help of calculated NME. Our results are consistent with the available experimental half-lives. The variation of cumulative <span><math><mn>2</mn><mi>ν</mi><mi>β</mi><mi>β</mi></math></span> NME with respect to the excitation energy of the intermediate <span><math><msup><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> states is also shown, and in all cases, it is ensured that their values are almost saturated. In the present work we have calculated more intermediate <span><math><msup><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> states as much as possible in comparison to results available in the literature.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138484122","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
TOTEM-ATLAS ambiguity: Shouldn't one worry? 图腾与天神的歧义:人们不应该担心吗?
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-12-01 DOI: 10.1016/j.nuclphysa.2023.122807
Vladimir A. Petrov, Nikolai P. Tkachenko
{"title":"TOTEM-ATLAS ambiguity: Shouldn't one worry?","authors":"Vladimir A. Petrov,&nbsp;Nikolai P. Tkachenko","doi":"10.1016/j.nuclphysa.2023.122807","DOIUrl":"10.1016/j.nuclphysa.2023.122807","url":null,"abstract":"<div><p>The values of the parameters <span><math><msup><mrow><mi>ρ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msup><mo>,</mo><msubsup><mrow><mi>σ</mi></mrow><mrow><mtext>tot</mtext></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msubsup></math></span> and <span><math><msup><mrow><mi>B</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msup></math></span> extracted in the region of Coulomb-nuclear interference (CNI) in the ATLAS and TOTEM experiments at energy <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn></math></span> TeV are studied based on the general expression for the Coulomb-nuclear amplitude. Due to the significant differences between these data, we undertake both their joint analysis and the retrieval of parameter values separately for each experiment. A significant incompatibility of these parameters published by the ATLAS and TOTEM experiments is shown. This is especially noticeable in the case of <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mtext>tot</mtext></mrow></msub></math></span> and the situation is similar to what once happened at the TEVATRON: the values of <span><math><msubsup><mrow><mi>σ</mi></mrow><mrow><mtext>tot</mtext></mrow><mrow><mi>A</mi><mi>T</mi><mi>L</mi><mi>A</mi><mi>S</mi></mrow></msubsup></math></span> with account of errors do not overlap with <span><math><msubsup><mrow><mi>σ</mi></mrow><mrow><mtext>tot</mtext></mrow><mrow><mi>T</mi><mi>O</mi><mi>T</mi><mi>E</mi><mi>M</mi></mrow></msubsup></math></span>.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534018","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
Lifetime measurement of the Ex = 2485.3 keV level of 25Al populated through 24Mg(p,γ)25Al resonance reaction 24Mg(p,γ)25Al共振反应填充25Al的Ex = 2485.3 keV寿命测量
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-11-29 DOI: 10.1016/j.nuclphysa.2023.122806
Arkabrata Gupta , Sathi Sharma , Sangeeta Das , Anik Adhikari , Anubhab Mondal , Madhusree Roy Chowdhury , Chandan D Bagdia , Lokesh Tribedi , Vandana Nanal , Abhijit Bisoi , M. Saha Sarkar , S. Sarkar
{"title":"Lifetime measurement of the Ex = 2485.3 keV level of 25Al populated through 24Mg(p,γ)25Al resonance reaction","authors":"Arkabrata Gupta ,&nbsp;Sathi Sharma ,&nbsp;Sangeeta Das ,&nbsp;Anik Adhikari ,&nbsp;Anubhab Mondal ,&nbsp;Madhusree Roy Chowdhury ,&nbsp;Chandan D Bagdia ,&nbsp;Lokesh Tribedi ,&nbsp;Vandana Nanal ,&nbsp;Abhijit Bisoi ,&nbsp;M. Saha Sarkar ,&nbsp;S. Sarkar","doi":"10.1016/j.nuclphysa.2023.122806","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122806","url":null,"abstract":"<div><p>Results of our experimental study of the <sup>24</sup>Mg<span><math><msup><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo></mrow><mrow><mn>25</mn></mrow></msup></math></span>Al resonance reaction at E<span><math><mmultiscripts><mrow><mo>=</mo></mrow><mprescripts></mprescripts><mrow><mi>p</mi></mrow><mrow><mi>l</mi><mi>a</mi><mi>b</mi></mrow></mmultiscripts><mn>223</mn></math></span><span> keV are presented. The proton beam energy is varied from 220 to 265 keV. An evaporated Mg target with thick Ta backing is used. We remeasure a mean lifetime of </span><span><math><mi>τ</mi><mo>=</mo><msubsup><mrow><mn>6.04</mn></mrow><mrow><mo>−</mo><mn>2.65</mn></mrow><mrow><mo>+</mo><mn>3.03</mn></mrow></msubsup></math></span> fs for the E<span><math><mmultiscripts><mrow><mo>=</mo></mrow><mprescripts></mprescripts><mrow><mi>x</mi></mrow><none></none></mmultiscripts><mn>2485.3</mn></math></span> keV level of <sup>25</sup><span>Al, using Doppler shift attenuation (DSA) method. Three most successfully used empirical effective interactions developed for the sd shell by Wildenthal (w), Chung-Wildenthal (cw) and Preedom-Wildenthal (pw), are utilized to calculate energy spectra<span>, spectroscopic factors, beta decay properties, transition probabilities and the lifetime of the resonance state in </span></span><sup>25</sup>Al within the framework of nuclear shell model. The theoretical results agree reasonably well with the experimental data. However, a detailed study for each set to identify the most preferred interaction for this nucleus is performed. Calculated lifetimes using two of the interactions (w, cw) agree better with the central value of the experimental lifetime of the resonance state measured in the present work.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473943","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
Measurement of fast neutron induced (n,γ) reaction cross-section of 152Sm, 154Sm and 150Nd in the energy range of 0.8 to 2 MeV 快中子诱导152Sm、154Sm和150Nd在0.8 ~ 2mev能量范围内(n,γ)反应截面的测量
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-11-29 DOI: 10.1016/j.nuclphysa.2023.122805
N.S. Tawade , R. Tripathi , T.N. Nag , S. Patra , C.S. Datrik , P.K. Pujari , R.G. Thomas , G. Mishra , A. Kumar , S. De , H. Kumawat
{"title":"Measurement of fast neutron induced (n,γ) reaction cross-section of 152Sm, 154Sm and 150Nd in the energy range of 0.8 to 2 MeV","authors":"N.S. Tawade ,&nbsp;R. Tripathi ,&nbsp;T.N. Nag ,&nbsp;S. Patra ,&nbsp;C.S. Datrik ,&nbsp;P.K. Pujari ,&nbsp;R.G. Thomas ,&nbsp;G. Mishra ,&nbsp;A. Kumar ,&nbsp;S. De ,&nbsp;H. Kumawat","doi":"10.1016/j.nuclphysa.2023.122805","DOIUrl":"10.1016/j.nuclphysa.2023.122805","url":null,"abstract":"<div><p>The (n,γ) reaction cross-section of rare earth stable fission products, such as <sup>152</sup>Sm, <sup>154</sup>Sm and <sup>150</sup>Nd, in the neutron energy range of 0.8 to 2 MeV, obtained from <sup>7</sup>Li(p,n)<sup>7</sup>Be reaction, was measured by neutron activation followed by off-line gamma-ray spectrometry. Natural strontium (<sup>nat</sup><span>Sr) has been established as a fast neutron flux monitor in this work, by measuring the </span><sup>nat</sup>Sr(n,γ+<em>n</em>,n′)<sup>87</sup>Sr<sup>m</sup> reaction cross-section using <sup>127</sup>I(n,γ)<sup>128</sup>I as monitor reaction. The cross-section for <sup>86</sup>Sr(n,γ)<sup>87</sup>Sr<sup>m</sup> has been determined for the first time to the best of our knowledge. The excellent decay properties of <sup>87</sup>Sr<sup>m</sup> and opposite energy dependence of <sup>86</sup>Sr(n,γ)<sup>87</sup>Sr<sup>m</sup> and <sup>87</sup>Sr(n,n′)<sup>87</sup>Sr<sup>m</sup> reactions makes <sup>nat</sup>Sr an excellent candidate for neutron flux monitor for wide neutron energy range. The measured (n,γ) cross-section data from the present study has been compared with the literature data, which is very limited along with large scatter in the energy range of 1–2 MeV for these nuclei. The results from the present study, clearly show a need for fresh cross-section evaluations for <sup>152</sup>Sm(n,γ)<sup>153</sup>Sm. For, <sup>154</sup>Sm(n,γ)<sup>155</sup>Sm and <sup>150</sup>Nd(n,γ)<sup>151</sup><span><span>Nd reactions, the present data align with one of the data groups among the two which can be broadly identified having difference of about more than ∼50%. The present experimental data has been compared with TALYS 1.96 theoretical model calculations based on Fermi gas level density prescriptions which shows that the cross section values are close to the experimental data at some of the neutron energies. A comparison of the data on </span>fast neutron capture cross-section for </span><em>N</em> = 90 isotones from the present study and from the literature showed a systematic decrease in the cross-section value with increasing neutron richness of the target nucleus. The cross-section data could be scaled with neutron-proton asymmetry parameter to show a nearly linear behaviour on a logarithmic scale. The data for <sup>154</sup>Sm (<em>N</em> = 92) was also observed to follow the same trend.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534000","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 model-independent irreducible tensor formalism to analyse the sequential decays of the triple strange process p¯p→Ω¯+Ω−→K+Λ¯K−Λ→K+p¯π+K−pπ− 用模型无关的不可约张量形式分析三重奇异过程p¯p→Ω¯+Ω−→K+Λ¯K−Λ→K+p¯π+K−pπ−的顺序衰减
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-11-22 DOI: 10.1016/j.nuclphysa.2023.122797
Deepak Pachattu
{"title":"A model-independent irreducible tensor formalism to analyse the sequential decays of the triple strange process p¯p→Ω¯+Ω−→K+Λ¯K−Λ→K+p¯π+K−pπ−","authors":"Deepak Pachattu","doi":"10.1016/j.nuclphysa.2023.122797","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122797","url":null,"abstract":"<div><p>A model-independent irreducible tensor formalism is developed to analyse <span><math><mover><mrow><mi>Ω</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>Ω</mi></math></span> production in <span><math><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>p</mi></math></span> collisions and its subsequent decay via the triple-strange decay process, <span><math><msup><mrow><mover><mrow><mi>Ω</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>Ω</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><mover><mrow><mi>Λ</mi></mrow><mrow><mo>¯</mo></mrow></mover><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup><mi>Λ</mi><mo>→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup><mi>p</mi><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span>. These processes are relevant for the upcoming experiments at PANDA. We not only provide expressions for the density matrix of the <span><math><mi>Ω</mi><mover><mrow><mi>Ω</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> system but also for the products at each stage of the decay. The Fano statistical tensors so obtained not only completely characterize the relevant final systems but also provide expressions for joint angular distributions. Finally, we show which of the Fano statistical tensors characterizing the <span><math><mover><mrow><mi>Ω</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>Ω</mi></math></span> system can be inferred from the Fano statistical tensors characterizing the final <span><math><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>p</mi></math></span> system, wherein we also obtain the relation between the production cross sections for <span><math><mi>Ω</mi><mover><mrow><mi>Ω</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> and the final <span><math><mi>p</mi><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> system.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138355977","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
Constraints on density dependent MIT bag model parameters for quark and hybrid stars 夸克星与杂化星密度相关的MIT袋模型参数约束
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-11-17 DOI: 10.1016/j.nuclphysa.2023.122796
Soumen Podder , Suman Pal , Debashree Sen , Gargi Chaudhuri
{"title":"Constraints on density dependent MIT bag model parameters for quark and hybrid stars","authors":"Soumen Podder ,&nbsp;Suman Pal ,&nbsp;Debashree Sen ,&nbsp;Gargi Chaudhuri","doi":"10.1016/j.nuclphysa.2023.122796","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122796","url":null,"abstract":"<div><p><span>We compute the equation of state (EoS) of strange quark stars (SQSs) with the MIT Bag model using density dependent bag pressure, characterized by a Gaussian distribution function. The bag pressure's density dependence is controlled by three key parameters namely the asymptotic value (</span><span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>a</mi><mi>s</mi></mrow></msub></math></span>), <span><math><mi>Δ</mi><mi>B</mi><mo>(</mo><mo>=</mo><msub><mrow><mi>B</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>−</mo><msub><mrow><mi>B</mi></mrow><mrow><mi>a</mi><mi>s</mi></mrow></msub><mo>)</mo></math></span>, and <em>β</em>. We explore various parameter combinations (<span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>a</mi><mi>s</mi></mrow></msub></math></span>, Δ<em>B</em>, <em>β</em>) that adhere to the Bodmer-Witten conjecture, a criterion for the stability of SQSs. Our primary aim is to analyze the effects of these parameter variations on the structural properties of SQSs. However we find that none of the combinations can satisfy the NICER data for PSR J0030+0451 and the constraint on tidal deformability from GW170817. So it can be emphasized that this model cannot describe reasonable SQS configurations. We also extend our work to calculate structural properties of hybrid stars (HSs). With the density dependent bag model (DDBM), these astrophysical constraints are fulfilled by the HSs configurations within a very restricted range of the three parameters. The present work is the first to constrain the parameters of DDBM for both SQS and HSs using the recent astrophysical constraints on tidal deformability from GW170817 and that on mass-radius relationship from NICER data.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138412808","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
Entrance channel dependence of quasi fission in reactions leading to 206Po compound nucleus 导致206Po复合核的准裂变反应的入口通道依赖性
IF 1.4 4区 物理与天体物理
Nuclear Physics A Pub Date : 2023-11-13 DOI: 10.1016/j.nuclphysa.2023.122789
Hajara K. , M.M. Musthafa , N. Madhavan , S. Nath , Jagadish Gehlot , Gonika , C.V. Midhun , Shaima Akbar , Fathima Shirin Shana , A. Parihari , Rohan Biswas , Amninder Kaur
{"title":"Entrance channel dependence of quasi fission in reactions leading to 206Po compound nucleus","authors":"Hajara K. ,&nbsp;M.M. Musthafa ,&nbsp;N. Madhavan ,&nbsp;S. Nath ,&nbsp;Jagadish Gehlot ,&nbsp;Gonika ,&nbsp;C.V. Midhun ,&nbsp;Shaima Akbar ,&nbsp;Fathima Shirin Shana ,&nbsp;A. Parihari ,&nbsp;Rohan Biswas ,&nbsp;Amninder Kaur","doi":"10.1016/j.nuclphysa.2023.122789","DOIUrl":"10.1016/j.nuclphysa.2023.122789","url":null,"abstract":"<div><p>The evaporation residue (ER) cross sections for the reaction <span><math><mmultiscripts><mrow><mi>F</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>19</mn></mrow></mmultiscripts><msup><mrow><mo>+</mo></mrow><mrow><mn>187</mn></mrow></msup><mi>R</mi><mi>e</mi><msup><mrow><mo>→</mo></mrow><mrow><mn>206</mn></mrow></msup><mi>P</mi><msup><mrow><mi>o</mi></mrow><mrow><mo>⁎</mo></mrow></msup></math></span> are measured, in the excitation energy range of 86.1 to 118.4 MeV. The measured cross sections are compared with that of <sup>30</sup>Si + <sup>176</sup><span>Yb reaction populating the same compound nucleus. Theoretical calculations are performed using the coupled - channels calculations for the capture cross sections and statistical model calculations for the ER cross sections. The dependence of quasi fission on entrance channel parameters such as charge product (Z</span><sub>1</sub>Z<sub>2</sub>), mass asymmetry (<em>α</em>), target deformation (<span><math><msub><mrow><mi>β</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>) and effective fissility (<span><math><msub><mrow><mi>χ</mi></mrow><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow></msub></math></span>) are studied.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135714512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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