Browsing by Author "Akash Hingu"

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Comprehensive analysis of uncertainty quantification for the 58Ni(n, p)58Co reaction cross section
(Institute of Physics, 2024) Mahesh Choudhary; Aman Sharma; Namrata Singh; Mahima Upadhyay; Punit Dubey; A. Gandhi; Akash Hingu; G. Mishra; Sukanya De; L.S. Danu; Ajay Kumar; R.G. Thomas; Saurav Sood; Sajin Prasad; S. Mukherjee; I.N. Ruskov; Yu. N. Kopatch; A. Kumar
In this study, we measured the 58Ni(n, p)58Co reaction cross section with neutron energies of 1.06, 1.86, and 2.85 MeV. The cross section was measured using neutron activation techniques and γ-ray spectroscopy, and it was compared with cross section data available in the EXFOR. Furthermore, we calculated the covariance matrix of the measured cross section for the aforementioned nuclear reaction. The uncertainties of the theoretical calculation for 58Ni(n, p)58Co reaction cross section were calculated via Monte Carlo method. In this study, we used uncertainties in the optical model and level density parameters to calculate uncertainties in the theoretical cross sections. The theoretical calculations were performed by using TALYS-1.96. In this study, we aim to analyze the effect of uncertainties of the nuclear model input as well as different experimental variables used to obtain the values of reaction cross section. © 2024 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Investigation of 58Ni (n, p)58Co reaction cross-section with covariance analysis
(Institute of Physics, 2024) Akash Hingu; S. Mukherjee; Siddharth Parashari; Arora Sangeeta; A. Gandhi; Mahima Upadhyay; Mahesh Choudhary; Sumit Bamal; Namrata Singh; G. Mishra; Sukanya De; Saurav Sood; Sajin Prasad; G. Saxena; Ajay Kumar; R.G. Thomas; B.K. Agrawal; K. Katovsky; A. Kumar
The excitation function of the reaction was measured using the well-established neutron activation technique and γ-ray spectroscopy. Neutrons in the energy range of 1.7 to 2.7 were generated using the reaction. The neutron flux was measured using the standard monitor reaction. The results of the neutron spectrum averaged cross-section of reactions were compared with existing cross-section data available in the EXFOR data library as well as with various evaluated data libraries such as ENDF/B-VIII.0, JEFF-3.3, JENDL-4.0, and CENDL-3.2. Theoretical calculations were performed using the nuclear reaction code TALYS. Various nuclear level density (NLD) models were tested, and their results were compared with the present findings. Realistic NLDs were also obtained through the spectral distribution method (SDM). The cross-section results, along with the absolute errors, were obtained by investigating the uncertainty propagation and using the covariance technique. Corrections for γ-ray true coincidence summing, low-energy background neutrons, and γ-ray self attenuation were performed. The experimental cross-section obtained in the present study is consistent with previously published experimental data, evaluated libraries, and theoretical calculations carried out using the TALYS code. © 2024 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Measurement of neutron induced reaction cross-section of 99Mo
(Institute of Physics, 2023) Mahima Upadhyay; Mahesh Choudhary; Namrata Singh; A. Gandhi; Aman Sharma; Sumit Bamal; Akash Hingu; S. Mukherjee; G. Mishra; Sukanya De; L.S. Danu; Saurav Sood; Sajin Prasad; Ajay Kumar; R.G. Thomas; A. Kumar
In the present work, we have measured 98Mo(n,γ)99Mo reaction cross-section using a 7Li(p,n)7Be neutron source at 1.67 ± 0.14, 2.06 ± 0.14 and 2.66 ± 0.16 MeV neutron energies. We have employed offline γ-ray spectroscopy to measure the induced activity of the sample. The 115In(n,n’γ)115mIn reaction was used as a monitor reaction. Different attributes propagating the uncertainty in the total result, measured cross-sections with their uncertainties and correlation coefficients are given in detail in the present study. The result is compared with the data libraries, EXFOR database and theoretical model outcome from different level density models. © 2023 IOP Publishing Ltd.
Measurements of neutron capture cross sections on109Ag at 0.53, 1.05, 1.66 MeV
(Institute of Electrical and Electronics Engineers Inc., 2023) Mahima Upadhyay; Mahesh Choudhary; Aman Gandhi; Namrata Singh; Sumit Bamal; Aman Sharma; Ajay Kumar; Akash Hingu; Sukanaya De; R.G. Thomas; Ajay Kumar; L.S. Danu; G. Mishra; A. Mitra; K. Katovsky; S. Mukherjee; Saurav Sood; Sajin Prasad
The cross section of the 109Ag(n,γ)110mAg reaction is measured with the aid of using the neutron activation approach and γ-ray spectroscopy. Neutrons were generated with the help of using the 7Li(p,n) reaction. The neutron flux was measured using the 115In(n,n')115mIn monitor reaction. The cross-section results were described along with the absolute errors, by uncertainty propagation, using the covariance technique. The corrections for γ-ray true coincidence summing, γ-ray self-attenuation were executed. © 2023 IEEE.
Probing uncertainties in proton capture on selected p-nuclei: a Monte Carlo investigation with TALYS-1.96
(Institute of Physics, 2025) Akash Hingu; Mahesh Choudhary; K. Katovsky; S. K. Mukherjee
Understanding proton capture reactions on p-nuclei is of interest for modeling nucleosynthesis in proton-rich astrophysical environments, but their theoretical description remains subject to significant uncertainties, which can influence the reliability of such models. This study investigates the sensitivity of reaction cross-sections and rates to variations in nuclear model inputs for proton capture on selected p-nuclei. The reactions 92Mo(p, γ)93,gTc, 92Mo(p, γ)93,mTc, 94Mo(p, γ)95,gTc, 74Se(p, γ)75Br, and 76Se(p, γ)77Br are examined within the incident proton energy range of 1 to 6 MeV. Theoretical calculations are performed using the TALYS-1.96 nuclear reaction code, and Monte Carlo simulations are employed to propagate uncertainties in the optical model and level density parameters. The resulting distributions of reaction observables provide a quantitative assessment of how model input variations influence predicted outcomes. While limited to a small set of nuclei, the results provide a preliminary indication of the sensitivity of model predictions to input parameters and may assist in guiding future efforts to reduce theoretical uncertainties in reaction rate evaluations for the p-process. © 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.
Study of the uncertainty quantification of the 121Sb(n,γ)122Sb reaction
(Springer Science and Business Media Deutschland GmbH, 2025) Namrata Singh; Mahesh Choudhary; A. Gandhi; Mahima Upadhyay; Ratankumar K. Singh; Akash Hingu; Gaurav P. Mishra; Sukanya De; Laxman Singh Danu; Ajay Vinod Kumar; Renju G. Thomas; Saurav Sood; Sajin Prasad; B. Lalremruata; K. Katovsky; A. Sameer Ruban Kumar
The reaction cross-sections for the 121Sb(n,γ)122Sb reaction were determined at 1.66, 2.65, and 3.05 MeV. The experiment was conducted using the neutron activation technique followed by the offline γ-ray spectrometry. The neutrons were generated using the 7Li(p,n)7Be reaction, and the reaction cross-section for 121Sb(n,γ)122Sb was measured with respect to the 115In(n,n′γ)115Inm monitor reaction cross-section. Wood–Saxon phenomenological optical model potentials (OMP) were used to calculate the uncertainties of the theoretical calculation for the 121Sb(n,γ)122Sb reaction cross-section. The measured reaction cross-section data are compared to the existing data available in the EXFOR database. Additionally, the data are compared to the evaluated data from ENDF/B-VIII.0 and JEFF-3.1/A. TALYS-1.96 nuclear code is used for the theoretical calculations. The measured cross-sections are given along with their uncertainties and covariance matrices. In this work, the theoretical cross-section uncertainties have been estimated using the uncertainties in the level density and optical model parameters. © The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025.