Pub Date : 2026-01-13DOI: 10.1016/j.nuclphysa.2026.123332
Larry Zamick
The previously considered (2j-1) rule for cross-conjugate pairs [44Sc, 52Mn] and [84Nb, 96Ag] is extended to a lighter pair [20F,24Na]. We also consider self-conjugate 8Li. It is noted and explained why the (2j-1) state in 20F is not isomeric.
{"title":"The (2j-1) rule for isomerism in odd-odd nuclei : Flip-flop behavior of cross-conjugates","authors":"Larry Zamick","doi":"10.1016/j.nuclphysa.2026.123332","DOIUrl":"10.1016/j.nuclphysa.2026.123332","url":null,"abstract":"<div><div>The previously considered (2j-1) rule for cross-conjugate pairs [<sup>44</sup>Sc, <sup>52</sup>Mn] and [<sup>84</sup>Nb, <sup>96</sup>Ag] is extended to a lighter pair [<sup>20</sup>F,<sup>24</sup>Na]. We also consider self-conjugate <sup>8</sup>Li. It is noted and explained why the (2j-1) state in <sup>20</sup>F is not isomeric.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1068 ","pages":"Article 123332"},"PeriodicalIF":2.5,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145993538","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}
Pub Date : 2026-01-13DOI: 10.1016/j.nuclphysa.2026.123327
S. Madhumitha Shree, M. Balasubramaniam
In this study, we introduce a machine learning approach to predict the logarithmic α-decay half-lives of ground-state emitters with a specific focus on extrapolating predictions to superheavy nuclei. The input data comprised of 344 experimentally determined α-decay half-lives. We utilized two complementary methodologies: XGBoost, an efficient ensemble learning algorithm, and PySR, a symbolic regression tool that generates interpretable empirical formulae. According to the SHAP (SHapley Additive exPlanations) explanation of the XGBoost model, features such as and were found to be very influential, which were chosen as input features for symbolic regression. PySR was trained to provide a simple empirical expression to calculate the logarithmic half-lives of α-decay. The derived expressions showed excellent agreement with the existing experimental data. Finally, we assess the extrapolation power of the models by predicting half-lives for the α-decay of various isotopes of superheavy nuclei of and . The results illustrate the power and physical accuracy of both approaches, making them suitable for guiding nuclear data evaluation in regions where experimental information is limited or unavailable.
{"title":"Machine learning and symbolic regression-based modeling of α-decay half-lives for superheavy nuclei","authors":"S. Madhumitha Shree, M. Balasubramaniam","doi":"10.1016/j.nuclphysa.2026.123327","DOIUrl":"10.1016/j.nuclphysa.2026.123327","url":null,"abstract":"<div><div>In this study, we introduce a machine learning approach to predict the logarithmic <em>α</em>-decay half-lives of ground-state emitters with a specific focus on extrapolating predictions to superheavy nuclei. The input data comprised of 344 experimentally determined <em>α</em>-decay half-lives. We utilized two complementary methodologies: XGBoost, an efficient ensemble learning algorithm, and PySR, a symbolic regression tool that generates interpretable empirical formulae. According to the SHAP (SHapley Additive exPlanations) explanation of the XGBoost model, features such as <span><math><msqrt><mi>Z</mi></msqrt></math></span> and <span><math><mrow><mn>1</mn><mo>/</mo><msqrt><mi>Q</mi></msqrt></mrow></math></span> were found to be very influential, which were chosen as input features for symbolic regression. PySR was trained to provide a simple empirical expression to calculate the logarithmic half-lives of <em>α</em>-decay. The derived expressions showed excellent agreement with the existing experimental data. Finally, we assess the extrapolation power of the models by predicting half-lives for the <em>α</em>-decay of various isotopes of superheavy nuclei of <span><math><mrow><mi>Z</mi><mo>=</mo><mn>107</mn></mrow></math></span> and <span><math><mrow><mi>Z</mi><mo>=</mo><mn>110</mn></mrow></math></span>. The results illustrate the power and physical accuracy of both approaches, making them suitable for guiding nuclear data evaluation in regions where experimental information is limited or unavailable.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1068 ","pages":"Article 123327"},"PeriodicalIF":2.5,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036866","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}
Pub Date : 2026-01-12DOI: 10.1016/j.nuclphysa.2026.123329
Xuan Liu , Sheng Lin , Xun Chen
The strength of the interaction between heavy quarks is studied for heavy quarkonium () and doubly heavy baryons (QQq) at finite temperature and rapidity using the gauge/gravity duality in this paper. We show that this theoretical framework is capable of simultaneously and accurately describing both and QQq by fitting lattice potentials. In this framework, we study their interaction at long distances or low temperature and rapidity through effective string tension, while the interaction at short distances or high temperature and rapidity is studied through effective running coupling. Additionally, we plot their state diagram in the plane and systematically calculate their respective screening distances.
{"title":"The interaction of moving QQ¯ and QQq in the thermal plasma","authors":"Xuan Liu , Sheng Lin , Xun Chen","doi":"10.1016/j.nuclphysa.2026.123329","DOIUrl":"10.1016/j.nuclphysa.2026.123329","url":null,"abstract":"<div><div>The strength of the interaction between heavy quarks is studied for heavy quarkonium (<span><math><mrow><mi>Q</mi><mover><mi>Q</mi><mo>¯</mo></mover></mrow></math></span>) and doubly heavy baryons (QQq) at finite temperature and rapidity using the gauge/gravity duality in this paper. We show that this theoretical framework is capable of simultaneously and accurately describing both <span><math><mrow><mi>Q</mi><mover><mi>Q</mi><mo>¯</mo></mover></mrow></math></span> and QQq by fitting lattice potentials. In this framework, we study their interaction at long distances or low temperature and rapidity through effective string tension, while the interaction at short distances or high temperature and rapidity is studied through effective running coupling. Additionally, we plot their state diagram in the <span><math><mrow><mi>T</mi><mo>−</mo><mi>η</mi></mrow></math></span> plane and systematically calculate their respective screening distances.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1068 ","pages":"Article 123329"},"PeriodicalIF":2.5,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145993588","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}
Pub Date : 2026-01-11DOI: 10.1016/j.nuclphysa.2026.123323
N. Döpper, N. Kaiser
We present a calculation of neutrino-induced pion production off the nucleon up to one-loop order in covariant SU(2) chiral effective field theory with explicit inclusion of the Δ(1232) resonance. The calculation is carried out by employing the extended-on-mass-shell scheme to handle terms that violate power-counting, and the complex mass scheme to account for the complex pole position of intermediate deltas. Of the 25 next-to-leading and next-to-next-to-leading low-energy constants entering the amplitude, 17 are already determined in non-weak processes, while four are estimated by fitting the axial nucleon-to-delta transition form factors to the Adler parametrization. The remaining four low-energy constants are set to zero. Results for the total and differential cross sections are presented and compared to experimental data from ANL and BNL, and to results from models and event generators.
{"title":"Neutrino-induced single-pion production off the nucleon in covariant chiral perturbation theory with explicit delta degrees of freedom","authors":"N. Döpper, N. Kaiser","doi":"10.1016/j.nuclphysa.2026.123323","DOIUrl":"10.1016/j.nuclphysa.2026.123323","url":null,"abstract":"<div><div>We present a calculation of neutrino-induced pion production off the nucleon up to one-loop order in covariant SU(2) chiral effective field theory with explicit inclusion of the Δ(1232) resonance. The calculation is carried out by employing the extended-on-mass-shell scheme to handle terms that violate power-counting, and the complex mass scheme to account for the complex pole position of intermediate deltas. Of the 25 next-to-leading and next-to-next-to-leading low-energy constants entering the amplitude, 17 are already determined in non-weak processes, while four are estimated by fitting the axial nucleon-to-delta transition form factors to the Adler parametrization. The remaining four low-energy constants are set to zero. Results for the total and differential cross sections are presented and compared to experimental data from ANL and BNL, and to results from models and event generators.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123323"},"PeriodicalIF":2.5,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145977049","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}
Pub Date : 2026-01-10DOI: 10.1016/j.nuclphysa.2026.123328
Mohammed Hassen Eid Abu-Seileek, Saed J. Al Atawneh
We present a systematic investigation of the thermal properties of the doubly magic nucleus 56Ni under thermal excitation, employing the Finite-Temperature Hartree-Fock (FTHF) method with two distinct realistic nucleon-nucleon (NN) interactions: the Reid Soft Core (RSC) and Nijmegen (Nijm.II) potentials. The primary objective is to quantify the sensitivity of key thermodynamic observables -including binding energy, root-mean-square radius, entropy, Helmholtz free energy, and the single-particle spectrum - to the choice of the underlying nuclear force. Calculations were performed in a no-core model space of six major oscillator shells across a temperature range of 0 to 8 MeV. Our results reveal that while macroscopic thermal trends are robust and largely potential-independent, critical quantitative differences emerge. The RSC potential predicts a higher excitation energy (205 MeV) for a 44.5 % volume expansion at MeV compared to 189 MeV for Nijm.II. Furthermore, we identify distinct interaction-dependent thresholds, such as a crossover in nuclear radius at MeV and a divergence in energy at MeV. Our comparative analysis with previous 40Ca calculations reveals that the thermal response of 56Ni is markedly different despite both being doubly magic. While 40Ca exhibits a volume expansion of 13.4 % at T = 8 MeV, 56Ni expands by only 3.5 %, scoring its stronger resistance to thermal swelling. Similarly, the entropy increase is substantially lower in 56Ni, with a slope reduction of nearly 40 % relative to 40Ca. Moreover, the crossover temperature at which RSC and Nijm.II potentials diverge occurs at T ≈ 2.4 MeV in both nuclei, but the subsequent divergence is quantitatively smaller in 56Ni, reflecting its larger shell gap and binding energy. These results establish that the thermal response is strongly mass-dependent, with heavier doubly magic nuclei displaying enhanced thermodynamic stability.
{"title":"Thermal properties of the doubly magic 56Ni nucleus","authors":"Mohammed Hassen Eid Abu-Seileek, Saed J. Al Atawneh","doi":"10.1016/j.nuclphysa.2026.123328","DOIUrl":"10.1016/j.nuclphysa.2026.123328","url":null,"abstract":"<div><div>We present a systematic investigation of the thermal properties of the doubly magic nucleus <sup>56</sup>Ni under thermal excitation, employing the Finite-Temperature Hartree-Fock (FTHF) method with two distinct realistic nucleon-nucleon (NN) interactions: the Reid Soft Core (RSC) and Nijmegen (Nijm.II) potentials. The primary objective is to quantify the sensitivity of key thermodynamic observables -including binding energy, root-mean-square radius, entropy, Helmholtz free energy, and the single-particle spectrum - to the choice of the underlying nuclear force. Calculations were performed in a no-core model space of six major oscillator shells across a temperature range of 0 to 8 MeV. Our results reveal that while macroscopic thermal trends are robust and largely potential-independent, critical quantitative differences emerge. The RSC potential predicts a higher excitation energy (205 MeV) for a 44.5 % volume expansion at <span><math><mrow><mi>T</mi><mo>=</mo><mn>8</mn></mrow></math></span> MeV compared to 189 MeV for Nijm.II. Furthermore, we identify distinct interaction-dependent thresholds, such as a crossover in nuclear radius at <span><math><mrow><mi>T</mi><mspace></mspace><mo>≈</mo><mspace></mspace><mn>5.6</mn></mrow></math></span> MeV and a divergence in energy at <span><math><mrow><mi>T</mi><mspace></mspace><mo>≈</mo><mspace></mspace><mn>2.4</mn></mrow></math></span> MeV. Our comparative analysis with previous <sup>40</sup>Ca calculations reveals that the thermal response of <sup>56</sup>Ni is markedly different despite both being doubly magic. While <sup>40</sup>Ca exhibits a volume expansion of 13.4 % at <em>T</em> = 8 MeV, <sup>56</sup>Ni expands by only 3.5 %, scoring its stronger resistance to thermal swelling. Similarly, the entropy increase is substantially lower in <sup>56</sup>Ni, with a slope reduction of nearly 40 % relative to <sup>40</sup>Ca. Moreover, the crossover temperature at which RSC and Nijm.II potentials diverge occurs at <em>T</em> ≈ 2.4 MeV in both nuclei, but the subsequent divergence is quantitatively smaller in <sup>56</sup>Ni, reflecting its larger shell gap and binding energy. These results establish that the thermal response is strongly mass-dependent, with heavier doubly magic nuclei displaying enhanced thermodynamic stability.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123328"},"PeriodicalIF":2.5,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145977050","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}
Pub Date : 2026-01-10DOI: 10.1016/j.nuclphysa.2026.123326
Mohd Faizan Khan , Avinash Agarwal , I.A. Rizvi , Anuj Kumar Jashwal , Harsh Vardhan , Munish Kumar , S. Ali , M. Gull , Satyam Gangwar , Kamal Kumar , S. Dutt , A.K. Chaubey
In the last couple of years, fusion processes triggered by heavy ions (HIs) have been a primary focus of study in low-energy nuclear physics. Recent experiments have confirmed that complete fusion (CF) and incomplete fusion (ICF) are the most prevalent modes in heavy ion (HI) interactions at energies above the Coulomb barrier. The purpose of the present work is to exclusively explore and measure the excitation functions (EF) of the evaporation residues (ERs) populated in 16O +89Y systems at energies ≈ 4 - 7 MeV / nucleon. A standard stacked foil activation technique followed by offline γ-ray spectroscopy with a high-resolution HPGe detector has been used. The theoretical predictions obtained from the statistical code have been assigned to scrutinise the experimentally measured EFs. In this present work, xn, pxn, αxn and 2αxn channels are investigated. Whereas, the measured excitation function of ERs populated via some xn (n = 2 and 3) channels has been observed to show a high-energy tail portion deviating from the trends of excitation functions as obtained by the statistical code at higher energies. This signifies the presence of pre-equilibrium (PE) emission for these reaction channels. A noticeable enhancement was observed in the production of reaction residues involving α particle(s) in the exit channels, even at energies close to the Coulomb barrier. This enhancement in the cross-section clearly demonstrates the incomplete fusion of the projectile with the target. The incomplete fusion probability has been calculated to better understand the reaction dynamics. The present findings and analysis of the data for various projectile-target combinations strongly suggest that entrance channel parameters like mass asymmetry (μA), Coulomb factor (ZPZT) and the variation in neutron excess in the target nucleus (N-Z) play a significant role in the onset of incomplete fusion.
{"title":"Measurement and analysis of excitation function for 16O+89Y at energies 4–7 MeV/nucleon","authors":"Mohd Faizan Khan , Avinash Agarwal , I.A. Rizvi , Anuj Kumar Jashwal , Harsh Vardhan , Munish Kumar , S. Ali , M. Gull , Satyam Gangwar , Kamal Kumar , S. Dutt , A.K. Chaubey","doi":"10.1016/j.nuclphysa.2026.123326","DOIUrl":"10.1016/j.nuclphysa.2026.123326","url":null,"abstract":"<div><div>In the last couple of years, fusion processes triggered by heavy ions (HIs) have been a primary focus of study in low-energy nuclear physics. Recent experiments have confirmed that complete fusion (CF) and incomplete fusion (ICF) are the most prevalent modes in heavy ion (HI) interactions at energies above the Coulomb barrier. The purpose of the present work is to exclusively explore and measure the excitation functions (EF) of the evaporation residues (ERs) populated in <sup>16</sup><em>O</em> +<sup>89</sup><em>Y</em> systems at energies ≈ 4 - 7 MeV / nucleon. A standard stacked foil activation technique followed by offline <em>γ</em>-ray spectroscopy with a high-resolution HPGe detector has been used. The theoretical predictions obtained from the statistical code have been assigned to scrutinise the experimentally measured EFs. In this present work, <em>xn, pxn, αxn</em> and 2<em>αxn</em> channels are investigated. Whereas, the measured excitation function of ERs populated via some <em>xn</em> (n = 2 and 3) channels has been observed to show a high-energy tail portion deviating from the trends of excitation functions as obtained by the statistical code at higher energies. This signifies the presence of pre-equilibrium (PE) emission for these reaction channels. A noticeable enhancement was observed in the production of reaction residues involving <em>α</em> particle(s) in the exit channels, even at energies close to the Coulomb barrier. This enhancement in the cross-section clearly demonstrates the incomplete fusion of the projectile with the target. The incomplete fusion probability has been calculated to better understand the reaction dynamics. The present findings and analysis of the data for various projectile-target combinations strongly suggest that entrance channel parameters like mass asymmetry (<em>μ<sub>A</sub></em>), Coulomb factor (<em>Z<sub>P</sub>Z<sub>T</sub></em>) and the variation in neutron excess in the target nucleus (N-Z) play a significant role in the onset of incomplete fusion.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123326"},"PeriodicalIF":2.5,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145977051","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}
This study investigates the radiation-shielding performance of lead-free barium phosphate glasses doped with manganese(II) oxide and neodymium(III) oxide. Six distinct glass compositions with varying dopant concentrations were analysed using the Phy-X/PSD photon shielding and dosimetry platform to evaluate their effectiveness against ionizing radiation. Over a broad photon energy range (1 keV-100 GeV), key shielding parameters, including the mass and linear attenuation coefficients, mean free path, half-value, tenth-value layer, effective atomic number, effective electron density, and fast neutron removal cross-section were systematically assessed. To complement the photon interaction analysis, the NIST ESTAR database and SRIM software were employed to determine projected ranges and stopping powers for electrons and ions (H, He, and C). Furthermore, PHITS Monte Carlo simulations were used to visualize photon transport behaviour and spatial distributions of effective dose rates within the glass samples. The results were compared with eleven reference glass systems reported in the literature. Among the investigated compositions, the sample doped with 2 mol% Nd2O3 exhibited the best overall radiation-shielding performance. The findings indicate that both MnO and Nd2O3-doped barium phosphate glasses demonstrate promising protective capabilities against ionizing radiation and are possible candidates for environmentally friendly shielding materials.
{"title":"Radiation shielding properties of manganese(II) oxide and neodymium(III) oxide-doped barium phosphate glasses: Analytical evaluation and PHITS simulation","authors":"Devendra RajUpadhyay , Uddab Bahadur Bhandari , Prakash Ghorasainee , Raju Khanal","doi":"10.1016/j.nuclphysa.2026.123324","DOIUrl":"10.1016/j.nuclphysa.2026.123324","url":null,"abstract":"<div><div>This study investigates the radiation-shielding performance of lead-free barium phosphate glasses doped with manganese(II) oxide and neodymium(III) oxide. Six distinct glass compositions with varying dopant concentrations were analysed using the Phy-X/PSD photon shielding and dosimetry platform to evaluate their effectiveness against ionizing radiation. Over a broad photon energy range (1 keV-100 GeV), key shielding parameters, including the mass and linear attenuation coefficients, mean free path, half-value, tenth-value layer, effective atomic number, effective electron density, and fast neutron removal cross-section were systematically assessed. To complement the photon interaction analysis, the NIST ESTAR database and SRIM software were employed to determine projected ranges and stopping powers for electrons and ions (H<span><math><msup><mrow></mrow><mo>+</mo></msup></math></span>, He<span><math><msup><mrow></mrow><mo>+</mo></msup></math></span>, and C<span><math><msup><mrow></mrow><mo>+</mo></msup></math></span>). Furthermore, PHITS Monte Carlo simulations were used to visualize photon transport behaviour and spatial distributions of effective dose rates within the glass samples. The results were compared with eleven reference glass systems reported in the literature. Among the investigated compositions, the sample doped with 2 mol% Nd<sub>2</sub>O<sub>3</sub> exhibited the best overall radiation-shielding performance. The findings indicate that both MnO and Nd<sub>2</sub>O<sub>3</sub>-doped barium phosphate glasses demonstrate promising protective capabilities against ionizing radiation and are possible candidates for environmentally friendly shielding materials.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1068 ","pages":"Article 123324"},"PeriodicalIF":2.5,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036856","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}
Pub Date : 2026-01-08DOI: 10.1016/j.nuclphysa.2026.123325
S. Rajput , D. Singh , A.G. Dimri , M. Das
The study was designed to investigate the different doses of gamma radiation (2.5, 5, 7.5 and 10 kGy) on the microbial load and physicochemical stability of branded and non- branded chilli and coriander powder over a 150 day storage period at room temperature (27 ± 2 °C) and compared with the control sample (unirradiated). Several bacterial species, Bacillus cereus, Salmonella sp. and Sulphite reducing Clostridia were identified in unirradiated spice samples. Results also indicated that gamma radiation processing dose is inversely proportion to the reduction of total microbial population in both the spice samples. Dose of 7.5 kGy for non-branded chilli and coriander powder and 5 kGy for branded showed significant (p < 0.05) removal of microbial load in the studied spices. Insignificant differences were noted in the physico chemical properties including moisture, pH, total ash, acid insoluble ash and crude fibre of spices after 150 days of storage. Acceptability of the irradiated product was assessed by induced radioactivity. These findings suggest that gamma radiation dose of 7.5 kGy for both spice samples had an excellent response for inactivation of naturally occurring microbial flora with insignificant (p > 0.05) changes in physico- chemical quality attributes and thus enhancing the shelf life of chilli and coriander powder.
{"title":"Influence of gamma radiation on microbial contamination in chilli and coriander powder: Enhancement of shelf life and stability of physico chemical parameters","authors":"S. Rajput , D. Singh , A.G. Dimri , M. Das","doi":"10.1016/j.nuclphysa.2026.123325","DOIUrl":"10.1016/j.nuclphysa.2026.123325","url":null,"abstract":"<div><div>The study was designed to investigate the different doses of gamma radiation (2.5, 5, 7.5 and 10 kGy) on the microbial load and physicochemical stability of branded and non- branded chilli and coriander powder over a 150 day storage period at room temperature (27 ± 2 °C) and compared with the control sample (unirradiated). Several bacterial species, <em>Bacillus cereus, Salmonella</em> sp. and Sulphite reducing Clostridia were identified in unirradiated spice samples. Results also indicated that gamma radiation processing dose is inversely proportion to the reduction of total microbial population in both the spice samples. Dose of 7.5 kGy for non-branded chilli and coriander powder and 5 kGy for branded showed significant (<em>p</em> < 0.05) removal of microbial load in the studied spices. Insignificant differences were noted in the physico chemical properties including moisture, pH, total ash, acid insoluble ash and crude fibre of spices after 150 days of storage. Acceptability of the irradiated product was assessed by induced radioactivity. These findings suggest that gamma radiation dose of 7.5 kGy for both spice samples had an excellent response for inactivation of naturally occurring microbial flora with insignificant (<em>p</em> > 0.05) changes in physico- chemical quality attributes and thus enhancing the shelf life of chilli and coriander powder.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1068 ","pages":"Article 123325"},"PeriodicalIF":2.5,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036865","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}
Pub Date : 2025-12-28DOI: 10.1016/j.nuclphysa.2025.123322
K. Prameela , S. Ramakrishna Reddy , Anjali Merin , K.V. Varsha , K.V. Jinu , Gonika , Alankar Singh , Rishabh Kumar , J. Gehlot , S. Nath , E. Prasad , A.M. Vinodkumar , P.V. Madhusudhana Rao , S. Appannababu
Fusion excitation function has been measured for the reaction 16O+138Ba around the Coulomb barrier energies using the recoil mass separator Heavy Ion Reaction Analyzer (HIRA). The fusion cross sections are strongly enhanced when compared to the predictions of the one dimensional barrier penetration model (1D-BPM) in the below barrier region. Fusion barrier distribution has been extracted from the experimental data to unveil the various channel couplings involved in the reaction. The measured fusion cross sections data and extracted barrier distribution have been analyzed with the coupled-channels (CC) calculations. These calculations indicate that the fusion excitation function has been reproduced quite well with the inclusion of one- and two-phonon vibrational states of the target nucleus. Whereas, one-phonon state alone was sufficient to reproduce the barrier distribution indicating that, coupling to the two-phonon state had no significant effect on the shape of the barrier distribution.
{"title":"Sub-barrier fusion dynamics in the reaction 16O+138Ba: Cross sections and barrier distribution studies","authors":"K. Prameela , S. Ramakrishna Reddy , Anjali Merin , K.V. Varsha , K.V. Jinu , Gonika , Alankar Singh , Rishabh Kumar , J. Gehlot , S. Nath , E. Prasad , A.M. Vinodkumar , P.V. Madhusudhana Rao , S. Appannababu","doi":"10.1016/j.nuclphysa.2025.123322","DOIUrl":"10.1016/j.nuclphysa.2025.123322","url":null,"abstract":"<div><div>Fusion excitation function has been measured for the reaction <sup>16</sup>O+<sup>138</sup>Ba around the Coulomb barrier energies using the recoil mass separator Heavy Ion Reaction Analyzer (HIRA). The fusion cross sections are strongly enhanced when compared to the predictions of the one dimensional barrier penetration model (1D-BPM) in the below barrier region. Fusion barrier distribution has been extracted from the experimental data to unveil the various channel couplings involved in the reaction. The measured fusion cross sections data and extracted barrier distribution have been analyzed with the coupled-channels (CC) calculations. These calculations indicate that the fusion excitation function has been reproduced quite well with the inclusion of one- and two-phonon vibrational states of the target nucleus. Whereas, one-phonon state alone was sufficient to reproduce the barrier distribution indicating that, coupling to the two-phonon state had no significant effect on the shape of the barrier distribution.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123322"},"PeriodicalIF":2.5,"publicationDate":"2025-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924724","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}
Pub Date : 2025-12-28DOI: 10.1016/j.nuclphysa.2025.123321
Mamta Aggarwal , Pranali Parab , A. Jain , G. Saxena
The temperature-driven shape dynamics of isotopic chains of Mo and Ru elements and their impact on decay modes have been investigated in a statistical theoretical framework with macroscopic-microscopic apporach. These isotopes located at the key points in r-process path are known for the rapid structural changes, shape instabilities and shape coexistence that impact the nuclear processes, decay modes and lifetimes. At high temperatures that may exist in stars or in various nuclear reaction processes, these nuclei undergo a variety of shape and deformation changes due to thermal shell quenching effects influencing the decay energies (Q value), and eventually life-time have been studied in detail. Our findings provide insight into the observed shift in the deformation, shapes and coexisting states due to the diminishing nuclear shell effects in hot nuclei, revealing that the structural changes influence the decay processes and significantly in the astrophysically relevant Mo-Ru region especially around A = 100.
{"title":"Thermal evolution of shape coexistence in Mo and Ru isotopes","authors":"Mamta Aggarwal , Pranali Parab , A. Jain , G. Saxena","doi":"10.1016/j.nuclphysa.2025.123321","DOIUrl":"10.1016/j.nuclphysa.2025.123321","url":null,"abstract":"<div><div>The temperature-driven shape dynamics of isotopic chains of Mo and Ru elements and their impact on decay modes have been investigated in a statistical theoretical framework with macroscopic-microscopic apporach. These isotopes located at the key points in r-process path are known for the rapid structural changes, shape instabilities and shape coexistence that impact the nuclear processes, decay modes and lifetimes. At high temperatures that may exist in stars or in various nuclear reaction processes, these nuclei undergo a variety of shape and deformation changes due to thermal shell quenching effects influencing the decay energies (Q value), and eventually life-time have been studied in detail. Our findings provide insight into the observed shift in the deformation, shapes and coexisting states due to the diminishing nuclear shell effects in hot nuclei, revealing that the structural changes influence the decay processes and significantly in the astrophysically relevant Mo-Ru region especially around A = 100.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1067 ","pages":"Article 123321"},"PeriodicalIF":2.5,"publicationDate":"2025-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145924745","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}
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