Browsing by Author "G. Saxena"

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Deformation dependence of 2p-radioactivity half-lives: probe with a new formula across the mass region with Z < 82
(Institute of Physics, 2023) G. Saxena; Mamta Aggarwal; D. Singh; A. Jain; P.K. Sharma; H.L. Yadav
Effect of deformation on half-life of two-proton (2p) radioactivity is investigated across the periodic chart for nuclei with Z < 82. 2p-decay half-lives are estimated by employing our newly proposed semi-empirical formula wherein the nuclear deformation has been incorporated in a phenomenological way. Robustness of the formula is demonstrated as it estimates the measured values quite accurately and, hence, reliably applied to predict the other possible 2p-emitters. For many proton rich nuclei for which experimental data on the decay energies are not available, we have used the theoretical values obtained from our calculations using the relativistic mean-field approach. The uncertainties in the theoretical decay energy values are minimised by machine learning technique. Correlation of 2p-radioactivity with 2p-halo and deformation is probed. Our calculations show the phenomenon of shape coexistence in several 2p-emitters, wherein the prolate shape is found to be more predominant for the ground state. © 2022 IOP Publishing Ltd.
Erratum: Study of neutron magic drip-line nuclei within relativistic mean-field plus bcs approach (International Journal of Modern Physics E (2013) 22: 5 (1350025))
(2013) G. Saxena; D. Singh; M. Kaushik; H.L. Yadav; H. Toki
[No abstract available]
Erratum: Study of two-proton radioactivity within the relativistic mean-field plus bcs approach (International Journal of Modern Physics E (2012) 21: 9 (1250076))
(2013) D. Singh; G. Saxena; M. Kaushik; H.L. Yadav; H. Toki
[No abstract available]
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.
Nutritional studies on nematode-trapping fungi
(Springer Netherlands, 1989) G. Saxena; R. Dayal; K.G. Mukerji
Utilization of 18 carbon and nitrogen sources and 9 vitamins by three network forming fungi Arthrobotrys oligospora, A. conoides and Monacrosporium cystosporum was studied. They were able to utilize almost all the carbon and nitrogen sources except few and showed variation in their efficiency of utilization. For good growth the fungi required thiamin, biotin and partially 4-aminobenzoic acid. © 1989 Academia, Publishing House of the Czechoslovak Academy of Sciences.
Weakly bound structures, halos and magicity in neutron rich nuclei
(World Scientific Publishing Co. Pte Ltd, 2008) G. Saxena; D. Singh; H.L. Yadav; A. Haga; H. Toki
Inspired by recent measurements indicating proton magic number at Z=14 in the vicinity of 42Si, we have employed our relativistic mean-field (RMF) plus state dependent BCS approach for the study of even-even nuclei to obtain magic numbers and to look for nuclei exhibiting weakly bound structures and even halo formation. In our RMF+BCS approach the single particle continuum corresponding to the RMF is replaced by a set of discrete positive energy states for the calculations of pairing energy. It is found that in several nuclei the filling in of low lying single particle resonant state with large angular momentum, even before it becomes a bound state, helps to accommodate more neutrons but with extremely small increase in the binding energy. This gives rise to the occurrence of weakly bound system of neutron rich nuclei. © 2008 World Scientific Publishing Company.