Browsing by Author "M. Saxena"

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Atmospheric Fine and Coarse Mode Aerosols at Different Environments of India and the Bay of Bengal During Winter-2014: Implications of a Coordinated Campaign
(Springer India, 2014) A. Sen; Y. Nazeer Ahammed; B.C. Arya; Tirthankar Banerjee; G. Reshma Begam; B.P. Baruah; A. Chatterjee; Anil K. Choudhuri; Amit Dhir; Trupti Das; Pitamber Prasad Dhyani; N.C. Deb; Ranu Gadi; Mangesh Gauns; Sanjay Kumar Ghosh; Abhishek Gupta; K.C. Sharma; A.H. Khan; K. Maharaj Kumari; Manish Kumar; Arun Kumar; Jagdish Chandra Kuniyal; Anita Lakhani; R.K. Meena; P.S. Mahapatra; S.W.A. Naqvi; Dharam Pal Singh; S. Pal; Sipra Panda; Rohtash; J. Saikia; P. Saikia; A. Sharma; Priyanka Sharma; M. Saxena; D.M. Shenoy; C. Viswanatha Vachaspati; S.K. Sharma; T.K. Mandal
In this paper, we present mass concentrations of particulate matter [PM2.5, PM10 size fractions and total suspended particulates (TSP)] measured simultaneously over land stations (Kullu, Patiala, Delhi, Ajmer, Agra, Lucknow, Varanasi, Giridih, Kolkata, Darjeeling, Jorhat, Itanagar, Imphal, Bhubaneswar, and Kadapa), mostly distributed across the Indo-Gangetic plain (IGP) of India as well as in the marine atmosphere over Bay of Bengal (BoB) in the period from 20 January to 3 February, 2014. The main objective of this study was to quantify the continental outflow of particulates (PM2.5, PM10 and TSP) from IGP and associated regions into the BoB along with low level north-east wind flow during winter monsoon period. The present study provides a glimpse of the aerosol loading over the IGP region. During this campaign, the highest average PM2.5 (187.8 ± 36.5 µg m−3, range 125.6–256.2 µg m−3), PM10 (272.6 ± 102.9 µg m−3, range 147.6–520.1 µg m−3) and TSP (325.0 ± 71.5 µg m−3, range 220.4–536.6 µg m−3) mass concentrations were recorded at Varanasi, Kolkata and Lucknow over middle and lower IGP regions. The PM2.5 (average 41.3 ± 11.9 µg m−3; range 15.0–54.4 µg m−3), PM10 (average 53.9 ± 18.9 µg m−3; range 30.1–82.1 µg m−3) and TSP (average 78.8 ± 29.7 µg m−3; range 49.1–184.5 µg m−3) loading over BoB were found to be comparable to land stations and suggests possible continental outflow. Over the continental region, the highest PM2.5/PM10 ratio was recorded at Delhi (0.87). The PM2.5/PM10 ratio over BoB (0.77) was found to be quite high and comparable to Varanasi (0.80) and Agra (0.79). © 2014, Metrology Society of India.
Investigation of an intruder band in 45 Sc via coulomb excitation ∗
(Jagellonian University, 2019) M. Matejska-Minda; R. Kumar; P.J. Napiorkowski; M. Saxena; S. Dutt; A. Agarwal; I. Ahmed; S. Bhattacharya; A. Jhingan; J. Kaur; M. Kicińska-Habior; M. Kumar; S. Kumar; D. Kumar; V. Nanal; R. Palit; N.K. Rai; M. Shuaib; A. Sood; A. Stolarz; T. Trivedi; A.K. Tyagi; R.K. Bhowmik; H.J. Wollersheim
In order to gain further information on the electromagnetic properties of the low-lying states in 45 Sc, a Coulomb excitation measurement was carried out at the IUAC, New Delhi. The 45 Sc target nuclei were Coulomb excited by the 70 MeV 32 S beam from the 15UD tandem accelerator. The γ-rays depopulating Coulomb excited states in 45 Sc were detected by four Clover detectors in coincidence with the forward scattered ions. The main aim of the experiment was to determine the B(E3; 7/2 − → 3/2 + ) and B(E3; 7/2 − → 5/2 + ) transition probabilities, as well as the transitional electromagnetic matrix elements for low-lying intruder states. © 2019 Jagellonian University. All Rights Reserved.
No evidence of reduced collectivity in Coulomb-excited Sn isotopes
(American Physical Society, 2017) R. Kumar; M. Saxena; P. Doornenbal; A. Jhingan; A. Banerjee; R.K. Bhowmik; S. Dutt; R. Garg; C. Joshi; V. Mishra; P.J. Napiorkowski; S. Prajapati; P.-A. Söderström; N. Kumar; H.-J. Wollersheim
In a series of Coulomb excitation experiments the first excited 2+ states in semimagic Sn112,116,118,120,122,124 isotopes were excited using a Ni58 beam at safe Coulomb energy. The B(E2; 0+→2+) values were determined with high precision (∼3%) relative to Ni58 projectile excitation. These results disagree with previously reported B(E2↑) values [A. Jungclaus, Phys. Lett. B 695, 110 (2011).PYLBAJ0370-269310.1016/j.physletb.2010.11.012] extracted from Doppler-shift attenuation lifetime measurements, whereas the reported mass dependence of B(E2↑) values is very similar to a recent Coulomb excitation study [J. M. Allmond, Phys. Rev. C 92, 041303(R) (2015)PRVCAN0556-281310.1103/PhysRevC.92.041303]. The stable Sn isotopes, key nuclei in nuclear structure, show no evidence of reduced collectivity and we, thus, reconfirm the nonsymmetric behavior of reduced transition probabilities with respect to the midshell A=116. © 2017 American Physical Society.
Re-measurement of reduced transition probabilities in 132ba
(Jagellonian University, 2018) S. Dutta; M. Saxena; R. Kumar; A. Jhingan; A. Agarwal; A. Banerjee; R.K. Bhowmik; C. Joshi; J. Kaur; A. Kumar; M. Matejska-Minda; V. Mishra; I.A. Rizvi; A. Stolarz; H.J. Wollersheim; P.J. Napiorkowski
Reduced transition probabilities between the low-lying states of 132Ba were measured using the Coulomb excitation technique. The experiment was performed at Inter University Accelerator Center (IUAC), New Delhi using a 58Ni beam of 175 MeV energy to Coulomb excite the 132Ba nuclei. In addition to the 2+1 state, other states in 132Ba, such as 2+2 and 4+1 , were populated, the latter for the first time using Coulomb excitation. A set of matrix elements was extracted for the transitions between these levels. These values were determined relative to 134Ba excitations to minimize the systematic errors. A B(E2; 0+gs → 2+1) value of 1.088(85) e2 b2 was determined, corresponding to -54:5 single-particle units. © 2018 Jagellonian University. All rights reserved.
Revised lifetime of the 11/2- state in 45Sc via coulomb excitation
(Jagellonian University, 2020) M. Matejska-Minda; P.J. Napiorkowski; R. Kumar; M. Saxena; S. Dutt; A. Agarwal; I. Ahmed; S. Bhattacharya; A. Jhingan; J. Kaur; M. Kicińska-Habior; M. Kumar; S. Kumar; D. Kumar; V. Nanal; R. Palit; N.K. Rai; M. Shuaib; A. Sood; A. Stolarz; T. Trivedi; A.K. Tyagi; R.K. Bhowmik; H.J. Wollersheim
A Coulomb-excitation measurement to study low-energy electromagnetic properties of 45Sc has been performed at the IUAC facility in New Delhi, India using a 70 MeV 32S projectile from the 15UD tandem accelerator. The preliminary value of the reduced transition probability B(E2; 11/2- → 7/2-) and the resulting lifetime for the 11/2- state at 1237 keV were determined using the GOSIA code. © 2020 Jagellonian University. All rights reserved.
Spatio-temporal variation in chemical characteristics of PM10 over Indo Gangetic Plain of India
(Springer Verlag, 2016) S.K. Sharma; T.K. Mandal; M.K. Srivastava; A. Chatterjee; Srishti Jain; M. Saxena; B.P. Singh; Saraswati; A. Sharma; A. Adak; S. K.Ghosh
The paper presents the spatio-temporal variation of chemical compositions (organic carbon (OC), elemental carbon (EC), and water-soluble inorganic ionic components (WSIC)) of particulate matter (PM10) over three locations (Delhi, Varanasi, and Kolkata) of Indo Gangetic Plain (IGP) of India for the year 2011. The observational sites are chosen to represent the characteristics of upper (Delhi), middle (Varanasi), and lower (Kolkata) IGP regions as converse to earlier single-station observation. Average mass concentration of PM10 was observed higher in the middle IGP (Varanasi 206.2 ± 77.4 μg m−3) as compared to upper IGP (Delhi 202.3 ± 74.3 μg m−3) and lower IGP (Kolkata 171.5 ± 38.5 μg m−3). Large variation in OC values from 23.57 μg m−3 (Delhi) to 12.74 μg m−3 (Kolkata) indicating role of formation of secondary aerosols, whereas EC have not shown much variation with maximum concentration over Delhi (10.07 μg m−3) and minimum over Varanasi (7.72 μg m−3). As expected, a strong seasonal variation was observed in the mass concentration of PM10 as well as in its chemical composition over the three locations. Principal component analysis (PCA) identifies the contribution of secondary aerosol, biomass burning, fossil fuel combustion, vehicular emission, and sea salt to PM10 mass concentration at the observational sites of IGP, India. Backward trajectory analysis indicated the influence of continental type aerosols being transported from the Bay of Bengal, Pakistan, Afghanistan, Rajasthan, Gujarat, and surrounding areas to IGP region. © 2016, Springer-Verlag Berlin Heidelberg.
STRUCTURE OF LOW-SPIN STATES IN45Sc STUDIED VIA COULOMB EXCITATION
(Jagiellonian University, 2024) M. Matejska-Minda; P.J. Napiorkowski; K. Sieja; P. Bednarczyk; T. Abraham; A. Agarwal; I. Ahmed; S. Bhattacharya; R.K. Bhowmik; D.T. Doherty; S. Dutt; K. Hadyńska-Klęk; J. Iwanicki; A. Jhingan; J. Kaur; M. Kicińska-Habior; M. Kisieliński; M. Komorowska; M. Kowalczyk; M. Kumar; R. Kumar; S. Kumar; D. Kumar; A. Maj; T. Marchlewski; P. Matuszczak; V. Nanal; A. Nannini; M. Palacz; R. Palit; L. Próchniak; N.K. Rai; M. Rocchini; M. Saxena; W. Satuła; M. Shuaib; M. Siciliano; A. Sood; J. Srebrny; A. Stolarz; J. Styczeń; T. Trivedi; A.K. Tyagi; B. Wasilewska; H.J. Wollersheim; K. Wrzosek-Lipska; M. Zielińska
The electromagnetic structure of45Sc at low excitation energy was investigated via low-energy Coulomb excitation at the Heavy Ion Laboratory (HIL) of the University of Warsaw and at the Inter-University Accelerator Centre (IUAC) in New Delhi. A set of reduced E2, E3, and M1 matrix elements was extracted from the collected data using the GOSIA code. The reduced transition probability B(E2; 11/2− → 7/2−) has been determined, allowing us to deduce the lifetime of the 11/2− state at 1237 keV. In addition, the upper limit on the reduced transition probability B(E3; 7/2− → 5/2+) has been determined for the first time. New large-scale shell-model and beyond-mean-field calculations were performed to interpret the structure of this nucleus. © 2024 Jagiellonian University. All rights reserved.