• M G Betigeri

      Articles written in Pramana – Journal of Physics

    • Rotational bands in79Kr

      S M Bharathi Y K Agarwal B Lal C V K Baba M G Betigeri N G Puttaswamy

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      The level scheme of79Kr has been studied through the79Br(p,n)79Kr reaction at proton energies from 1·7 to 5·0 MeV.γ-ray and internal conversion electron measurements were made using Ge(Li) detectors and a six gap “Orange” electron spectrometer. The level scheme was established by determining the thresholds of variousγ-rays and byγ-γ and n-γ coincidence measurements. New levels at 402, 450, 660, 676, 695, 720, 810, 836, 907 and 1038 keV not observed in earlier radioactivity studies have been established. DefiniteJπ assignments have been made to most of the levels below 800 keV. Many of the low-lying levels are identified as rotational levels based on the (301 ↓) 1/2, (301 ↑) 3/2 and (431 ↓) 1/2+ Nilsson states.

    • Isobaric analogue resonances in71As through proton elastic scattering on70Ge

      C R Ramaswamy N G Puttaswamy M G Betigeri

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      The analogues of the low-lying levels in71Ge have been observed as resonances in the compound nucleus71As through proton elastic scattering on70Ge in the energy rangeEp=3.5 to 5.3 MeV. The excitation functions cover the analogue resonances corresponding to states upto 2.3 MeV excitation in71Ge. The sub-structures in the 5.06 MeV resonance, first observed by Temmer and co-workers have been confirmed in the present experiment. The present investigation reveals similar sub-structures in the 4.13 MeV resonance lending further support to the existence of intermediate structure near an isobaric analogue resonance. The resonance parameters and the spectroscopic factors (for the corresponding parent states) have been extracted. The results are compared with the information available from the70Ge(d, p)71Ge reaction.

    • Excited atomic state of Li

      CV K Baba M G Betigeri V M Datar M B Kurup R P Sharma P Singh

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      An optical transition of 3489 A has been shown to arise from Li using beam foil spectroscopic technique. The mean life of the state emitting this radiation has been measured to be 2.23 ä 0.08 n sec.

    • Two million volt terminal tandem accelerator

      M G Betigeri T P David S C Hiremath P K Iyengar M K Mehta V S Raju P Singh J N Soni

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      Design and construction details of a horizontal 2 MV Tandem Van de Graaff accelerator built at Bhabha Atomic Research Centre are given. A terminal voltage of 2.15 MV has been achieved. Energy analysed Corona stabilized beams of protons and oxygen ions have been obtained. Experiments have been carried out to test the performance of the accelerator.

    • Design of an accelerating tube for electrostatic accelerators

      P Singh T P David M G Betigeri

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      An accelerating tube has been designed and fabricated. Ion optical properties with different input beam geometries for 25 keV protons have been studied. An optimum voltage gradient in the first few sections required to obtain a focussed beam is determined. The tube has been installed in the 2 MV tandem accelerator built at Trombay and the performance of the tube is discussed.

    • Design studies of a 100 MeV proton linear accelerator

      P Singh R Mythili M G Betigeri

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      Design details of a 100 MeV proton linear accelerator (Alvarez system) operating at a resonating frequency of 400 MHz have been studied. Increase in the linac operating frequency has become feasible with the possibility of injecting protons from a radio frequency quadrupole accelerator with energies higher than the conventional pre-injectors. Various electrical parameters of such a system have been calculated and compared with the existing linac injectors operating at 200 MHz.

    • 12C induced transfer reactions on 56Fe

      Hari S Patel B Srinivasan B J Roy M G Betigeri

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      Transfer reactions 56Fe(12C, xN) have been investigated. Angular distributions of particles following elastic scattering, one neutron and one proton transfer reaction channels leading to low lying states in respective residual nuclei have been measured. These are analysed using the coupled reaction channel (CRC) formalism. Starting with a double folded real potential, the elastic scattering angular distribution is calculated using the computer code FRESCO. Inclusion of couplings to first excited states in both the target and the projectile already tends to describe the experimental elastic scattering distribution. Additional coupling of one neutron transfer reaction to first five excited states in 55Fe and one proton transfer reaction to first three low lying states in 57Co improves fit to the elastic scattering angular distribution. Further refinement in fit is brought about by addition of a weak imaginary potential to the complex potential calculated by ERESCO to simulate the absorption effects due to those channels whose coupling is not included explicitly. Such a potential describes the experimental angular distributions for elastic, one neutron and one proton transfer channels correctly in shape and magnitude without any arbitrary normalisation.

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