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- Saha, S., et al.
(författare)
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Observation of rotation about the longest principal axis in Zr 89
- 2019
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Ingår i: Physical Review C. - 2469-9985. ; 99:5
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Tidskriftsartikel (refereegranskat)abstract
- High-spin states in Zr89 were populated in the Se80(C13,4n) reaction, and γ-ray coincidences were measured using the Indian National Gamma Array. The level scheme of Zr89 has been extended up to spin I=49/2 with the observation of a new dipole band. Directional correlation and polarization asymmetries of the γ rays have been measured to determine spin and parity of the levels. Line shapes of several transitions have been analyzed to determine lifetimes of the levels. Possible configurations of the band have been discussed using the cranked Nilsson-Strutinsky model. The calculations suggest a triaxial shape of the nucleus at high spins, and the band may represent rotation of the nucleus about the longest axis.
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- Bhattacharya, S., et al.
(författare)
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Evolution of collectivity and evidence of octupole correlations in Br 73
- 2019
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Ingår i: Physical Review C. - 2469-9985. ; 100:1
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Tidskriftsartikel (refereegranskat)abstract
- High-spin states in the Br73 nucleus have been populated via the Cr50(Si28,αp)Br73 fusion evaporation reaction with a beam energy of 90 MeV. The deexciting gamma rays were detected using the Indian National Gamma Array (INGA). Using the γ-γ coincidence technique, two new bands and eight new interconnecting transitions have been added. The strong interconnecting E1 transitions, between positive and negative parity bands, ensure the existence of octupole correlations at low spin. Line shapes have been observed for 17 transitions, which were analyzed by the Doppler-shift attenuation method to determine the lifetime of excited states of the yrast negative parity band and its signature partner band along with the positive parity band. The deduced transitional quadrupole moments Qt for the ground state band decrease with increasing spin, with their values ranging from 2.88 to 1.00 eb. A similar trend in the quadrupole moment has also been observed for the signature partner as well as for the positive parity band. This decrease in Qt with increasing spin for these bands is interpreted in terms of the cranked Nilsson-Strutinsky model and total Routhian surface calculations, which indicate possible band termination at higher spin.
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- Singh, Purnima, et al.
(författare)
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High-spin spectroscopy of I-122
- 2012
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Ingår i: Physical Review C (Nuclear Physics). - 0556-2813. ; 85:5
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Tidskriftsartikel (refereegranskat)abstract
- High-spin states in I-122 have been investigated using the Cd-116(B-11,5n)I-122 reaction at a beam energy of 65 MeV and gamma-ray coincidence events were recorded with the INGA spectrometer. The level scheme of I-122 has been extended up to spin I = 30. Experimental features, such as band-crossing frequencies, aligned angular momenta, signature splitting, and B(M1)/B(E2) ratios have been used for configuration assignments to low-energy band structures. Maximally aligned states involving all eight particles outside the Sn-114 core and states with one particle antialigned have been identified. Cranked Nilsson-Strutinsky calculations have been used to interpret high-spin structures.
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- Basu, Anwesha, et al.
(författare)
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Evolution of collective and noncollective structures in Xe 123
- 2020
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Ingår i: Physical Review C. - 2469-9985. ; 101:2
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Tidskriftsartikel (refereegranskat)abstract
- An experiment involving a heavy-ion-induced fusion-evaporation reaction was carried out where high-spin states of Xe123 were populated in the Se80(Ca48,5n)Xe123 reaction at 207 MeV beam energy. Gamma-ray coincidence events were recorded with the Gammasphere Ge detector array. The previously known level scheme was confirmed and enhanced with the addition of five new band structures and several interband transitions. Cranked Nilsson-Strutinsky (CNS) calculations were performed and compared with the experimental results in order to assign configurations to the bands.
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- Routh, J, et al.
(författare)
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Arsenic reduction by indigenous bacteria in shallow aquifers from Ambikanagar, West Bengal, India
- 2005
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Ingår i: ADVANCES IN ARSENIC RESEARCH. - WASHINGTON, DC : AMER CHEMICAL SOC. - 0841239134 ; , s. 132-147
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Konferensbidrag (refereegranskat)abstract
- Possible biological mechanisms contributing towards the transformation of arsenic (As) in aquifer sediments was investigated in Ambikanagar. Enrichment cultures indicated several As tolerant species, which actively reduced As(V) under sub-oxic conditions. High As concentrations in the microcosms increased toxicity, and hence, bacterial types and the heterotrophic plate counts declined. Bacteria isolated from enrichment cultures were Acinetobacter johnsonii, Citrobacter freundii, Comamonas testosteroni, Enterobacter cloacae, and Sphingobium yanoikuyae. On inoculating the medium with these bacteria, different growth and As(V) reduction rates occurred. A zero-order model fits the As(V) reduction data. Initial As concentration seems to affect growth and As(V) reduction rates, and these values were highest in A. johnsonii. In contrast, C testosteroni and S. yanoikuyae were almost unaffected by the initial As(V) concentrations. As(V) reduction in these bacteria occurs for detoxification or respiratory purposes (e.g., A. johnsonii). These experiments confirm that microorganisms may result in remobilization of As from sediments, and impact groundwater treatment.
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- Beran, P., et al.
(författare)
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Neutron powder diffraction study of Ba3ZnRu2-xIrxO9 (x=0, 1, 2) with 6H-type perovskite structure
- 2015
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Ingår i: Solid State Sciences. - : Elsevier BV. - 1293-2558 .- 1873-3085. ; 50, s. 58-64
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Tidskriftsartikel (refereegranskat)abstract
- The triple perovskites Ba3ZnRu2-xIrxO9 with x = 0, 1, and 2 are insulating compounds in which Ru(Ir) cations form a dimer state. Polycrystalline samples of these materials were studied using neutron powder diffraction (NPD) at 10 and 295 K. No structural transition nor evidence of long range magnetic order was observed within the investigated temperature range. The results from structural refinements of the NPD data and its polyhedral analysis are presented, and discussed as a function of Ru/Ir content.
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