[en] Research in the field of nuclear physics in India began some 40 years ago. A brief account of the research activities in both experimental and theoretical nuclear physics is given. It is noted, that the research so far made and being conducted does not match the international standards. So far no new experimental or calculational techniques in accelerator technology has been developed in India. So also no new experiment based on an experimental or theoretical idea developed for the first time in India has been performed. Reasons for giving high priority to the development of nuclear physics as one of the most basic subjects of physics are discussed. Programmes for future must be formulated in such a way that the available funds are put to optimum use. For this purpose it is suggested that: (1) there should be a partnership between universities and the Department of Atomic Energy in setting up of the experimental facilities, (2) there should be corresponding change in the administrative procedures of the universities (3) collaborative programmes with foreign countries should be taken up with the aim of achieving self-sufficiency and to raise the level of research to that of international standards, (4) an attempt should be made to develop an Asian Centre of Nuclear Physics in India which should house a proton synchrotron and a high energy linear accelerator around which research activities in medium energy range can be developed, (5) the universities should be encouraged to develop strong theoretical nuclear physics centres, and (6) schools of theoretical nuclear physics around very good senior research scientists should be developed. (M.G.B.)

[en] Only those nuclear physics experiments, which were carried out using (a) 3.7 MeV neutrons, (b) 14.8 MeV neutrons and (c) thermal protons, using reactors which were published in about ten publications are described in the article. This covers a certain range of energies, in neutron physics, in a period from 1953-2011 - a span of more than fifty years. Though the sequence and the type of experiments were carried out were determined by the circumstances of the availability of the accelerators and reactors; it has covered the full range of nuclear reaction models., i.e. (i) Optical potential model, (ii) Inelastic scattering model, (iii) Compound nucleus model, and (iv) Pre-equilibrium model

[en] The variable energy cyclotron, which was transferred from the department of Physics, Rochester University, Rochester (N.Y.), USA, is now functioning satisfactorily at Chandigarh. The machine is housed in an underground building of about 80' x 80'. Apart from repairing, renovating and suitably modifying the various components, a few major modifications have been made, which have improved the functioning of the machine. (1) The Dee and the central stem of the cavity have been directly connected together electrically and not through a press contact as before. This change has reduced the radiofrequency heating due to contact resistance to a very large extent. (2) Another 12 in. diffusion pump with 2000 litres/sec capacity has been added to increase the pumping speed. This additional pump has resulted in a very stable operation at the oscillator. (3) The vacuum chamber containing the Dee has been supported from inside the brass supports, and further spacers have been provided between the chamber and the pole pieces. These spacers helped to obtain an undisturbed vacuum with or without the main magnetic field. (4) A closed circuit chilled water system has been provided to supply chilled water at 30 lbs/sq. in. pressure to the cooling coils of the magnet, the oscillator tube and the vacuum pumps. (Auth.)

[en] The paper describes the operational characteristics of the variable energy cyclotron at Panjab University, Chandigarh (India) operating since 1977. The various innovations in the machine to increase its stability, beam intensity and resolution are discussed in detail. The machine is operating at present with α-particles, helium-3, deuterons and protons. A few spectra, of gamma rays and charged particles, dipicting the quality of the beam, are presented alongwith the results obtained in various experiments already performed with the machine

[en] The characteristics and performance of the variable energy cyclotron at Chandigarh have been described. The machine operates for protons at 1 to 5 MeV, for deuterons at 4 MeV, for alphas from 1 to 20 MeV and 7 to 8 MeV, and He³⁺⁺ upto 11 MeV. The resolved beams of different particles from 30 na to 1 μA have been obtained at the target with a resolution of about 30 keV. The magnetic field and the beam profile in the chamber are discussed. Various gamma-ray and charged particle spectra are given to indicate the performance of the accelerator. (auth.)

[en] The variable energy cyclotron, located at Chandigarh, India, has been described in detail. The specifications and usability of the machine are enumerated. The present work done on it as well as the future plans are outlined. (K.B.)

No abstract available

No abstract available

[en] This paper describes the improvement effected in the beam extraction efficiency of Chandigarh Cyclotron through the application of the shim coils to control the first harmonoc in the azimuthal distribution in the field of the cyclotron magnet. By adjusting empirically the currents through these coils the beam extraction efficiency has been improved from 30 percent to about 45 percent. (author)

[en] The low-lying levels of ¹²⁷I and ¹⁹⁷Au were Coulomb excited with 3.54 to 4.2 MeV protons. The reduced quadrupole transition probabilities of the 203, 374.9, 418, 618.4, 628.7, 651.1 and 745.5 keV states of ¹²⁷I, and the 268.8, 278.9, 502, and 547.5 keV states of ¹⁹⁷Au was measured from Coulomb excitation by observing the de-excitation gamma rays with a high resolution Ge(Li) detector. The low-energy protons were used for the first time to Coulomb-excite the two levels at 618.4 and 651.1 keV of ¹²⁷I and one level at 502 keV of ¹⁹⁷Au. The present experimental results are found in agreement with the existing experimental data except the B(E2) value of the level at 268.8 keV of ¹⁹⁷Au. (author). 4 figs., 4 tabs., 32 refs