Chinmay Basu

Performance of a position sensitive low-pressure wire chamber (LPWC) having position readout from a separate sense wire plane: a critical analysis

Abstract The paper describes the operation of a simple one-dimensional LPWC from a completely different standpoint. The position output is derived from a separate position plane, where discrete resistances are soldered between two adjacent wires. Theoretical formulations for the position extraction are derived where the role of various detector parameters are dealt with. Position spectrum is shown for various choices of resistances varying from 50 Ω to 220 kΩ . Best position resolution and linearity is obtained for 33 kΩ though it violates the existing hypothesis.

Pre-equilibrium cluster angular distribution in heavy ion nuclear reactions

A closed-form formulation is presented to evaluate pre-equilibrium cluster angular distribution in heavy ion reactions in terms of energy- and momentum-dependent level densities. The formalism is free of adjustable parameters and is tested for Z2 cluster emissions.

Closed-form evaluation of pre-equilibrium light-cluster emission in heavy ion reactions

Abstract A formalism is developed to evaluate pre-equilibrium cluster emission spectra in heavy ion reactions using a closed form expression obtained by extending the hybrid model of pre-equilibrium nuclear reactions.

Breakup effects on alpha spectroscopic factors of 16O

The triton angular distribution for the 12C(7Li,t)16O* reaction is measured at 20 MeV, populating discrete states of 16O. Continuum discretized coupled reaction channel calculations are used to to extract the alpha spectroscopic properties of 16O states instead of the distorted wave born approximation theory to include the effects of breakup on the transfer process. The alpha reduced width, spectroscopic factors and the asymptotic normalization constant (ANC) of 16O states are extracted. The error in the spectroscopic factor is about 35% and in that of the ANC about 27%.

Spectroscopic factors for two-proton radioactive nuclei

Spectroscopic factors for two-proton emitting nuclei are discussed in the framework of the BCS (Bardeen-Cooper-Schriefer) model. Calculations carried out for the two-proton unstable45Fe,48Ni and54Zn nuclei are presented.

Target-projectile symmetry effects on fast light-particle emissions in heavy ion reactions

Abstract A semi-classical formalism is presented to account for the change in shape of angular distributions of fast light ejectiles in heavy ion reactions with changing mass-symmetry of target and projectile.

ALPHA SPECTROSCOPIC FACTOR OF 16O FROM ITS BREAKUP USING CONTINUUM DISCRETIZED COUPLED CHANNEL (CDCC) METHOD

In this work we extract the alpha spectroscopic factor (Sα) of 16O ground state from breakup reaction. The CDCC theory is used to extract Sα by comparison with 16O breakup data from a light target (27Al). Extracted values show a small dependence on the single particle binding potential of 16O at forward angles. At incident energies between 72 to 125 MeV Sα varies from 2.29-2.83 (Wood Saxon binding potential) and between 2.42-3.72 (Gaussian potential).

Reaction mechanisms in {sup 16}O+{sup 40}Ca at an incident energy of E({sup 16}O) =86 MeV through inclusive measurements of {alpha} and proton spectra

The {alpha} and proton spectra from the {sup 16}O+{sup 40}Ca reaction is measured at E({sup 16}O) =86 MeV at several laboratory angles between 54 deg. and 138 deg. Analysis in terms of the statistical model for compound nuclear reactions show that an event-by-event calculation of the evaporation spectra removes discrepancy observed with standard calculations.

MAGIC NUMBERS FROM NEW SYSTEMATICS

A new systematics from the separation energy of deuteron is used to examine the magicity of stable as well as nuclei towards dripline.

STUDY OF STATISTICAL EMISSIONS IN 28Si+natSi AND 28Si+27Al REACTIONS AT 4–5 MeV/A INCIDENT ENERGIES

We measure the energy spectra of α-particles and protons in 28Si+natSi and 28Si+27Al reactions at 4–5 MeV/A for both forward and backward angles. We show with a statistical model that the choice of the level density parameter plays a very crucial role in explainning the evaporation spectra. The shell corrected Gilbert Cameron level density parameter is found to give satisfactory results.