[en] The sd - pf interface nuclei usually exhibit the characteristic of spherical single-particle excitation spectra and their spectra are well explained by the spherical shell-model. It is now possible to study these nuclei at higher angular momentum and excitation energy using sophisticated detectors and advanced data acquisition systems. As a result, the coexistence of single-particle and collective excitations have been noticed in a few sd-pf interface nuclei viz. ⁴⁰Ca, etc.⁴⁰K is the isobaric partner nucleus of ⁴⁰Ca. So, in ⁴⁰K, we may also expect generation of collective excitations at higher excitation energy from multi-particle multi-hole excitations. ⁴⁰K nucleus was previously studied through heavy-ion reaction. Several states with excitation energy up to 8 MeV and spin up to 10^- have been discovered. They have assigned the spin and parity of these levels tentatively based on the comparison of the branching ratios to the Weisskopf value. Therefore, our primary motivation is to investigate the high-spin structure of ⁴⁰K and assign or confirm the spin and parity of these levels in ⁴⁰K

[en] Nuclei in the neighbourhood of doubly closed ⁴⁰Ca usually exhibit characteristics of single particle excitations. The ground state and low lying excited states of several nuclei in this mass region have been reproduced by using untruncated shell model calculation over the sd space. In the present work, ³³S has been populated through heavy-ion fusion evaporation reaction and the level scheme has been extended

[en] The existence of the magnetic rotational (MR) bands, consisting of strong magnetic dipole (M1) transitions, in nearly spherical weakly deformed nuclei is well established. The experimental signature these bands is the characteristic decrease of the B(M1) values with spin along the band. Nuclei in the vicinity of the ¹⁴⁶Gd (Z = 64, N = 82) core have been subjects of many spectroscopic investigations over the last two decades. In particular, several studies on the observation of dipole bands in these nuclei were reported in the literature, of which the bands in ^139,142Sm, ^141,143Eu, ¹⁴²Gd were interpreted as MR bands. The earlier studies on ¹⁴¹Sm have been reported a dipole cascade at an excitation energy of 3.4 MeV. In the present investigation, the lifetimes of these states in the dipole band have been determined using the Doppler shift attenuation method (DSAM) and have been interpreted as MR band in the framework of the shears mechanism with the principal axis cranking (SPAC) model calculations

[en] Nuclei located on or close to the N=Z line have been generating a considerable interest during the last few years. This region gives us a unique opportunity to investigate some fundamental problems in nuclear physics like isospin symmetry of nuclear interaction. The isospin T is a good quantum number under the fundamental assumptions of charge symmetry and charge independence of the strong nuclear force. If isospin symmetry holds in nuclear interaction, then the level schemes and strength of E1 transitions between analog states of a mirror pair should be identical. Moreover, ΔT=0 E1 transitions are forbidden in N=Z self conjugate nuclei by isospin selection rules. Therefore, isospin symmetry breaking effects can be studied by investigating the level structures of mirror or self-conjugate nuclei

[en] Nuclei in the neighborhood of doubly closed "4"0Ca usually exhibit characteristics of single particle excitations at low energies. However, several nuclei viz., "4"0Ca and "3"6Ar in this mass region have also revealed deformed states (even superdeformation) at relatively higher excitation energies. The observed Superdeformed (SD) bands in these α-conjugate nuclei have been explained using complementary descriptions in terms of particle-hole excitations in the shell model, and α-clustering configurations within various cluster models. In "3"6Ar, "4"0Ca, the average deformation (β_2) of the SD bands generated with (4p-4h) and (8p-8h) excitations in the pf (N=3) shell, are 0.45 and 0.59, respectively. This is similar to the observation in heavier nuclei where the occupation numbers of high-N orbital have been found to characterise SD bands

[en] The study of 1f_7/2-shell nuclei has generated a renewed interest because these nuclei provide a unique opportunity to investigate the interplay of single particle and collective excitations. Near the middle of the 1f_7/2 shell, the number of valence particles/holes is large enough to lead to collective behavior. The collectivity in the ground state therefore, increases towards the middle of the 1_f7/2 shell and starts to disappear while approaching the doubly magic nucleus ⁵⁶Ni, as nuclei evolve towards a spherical shape

[en] In nuclear structure physics, the absolute transition rates play a crucial role to understand behavior of the nucleons in a nucleus and requires the erudition about lifetimes of the states. As the rate of the decay of an excited nuclear state is proportional to the square of the matrix element of the transition operator between the initial and final state wave function, measured lifetimes provide a very sensitive fingerprint of the relevant nuclear models

[en] In order to investigate the level structure of ³⁷Ar, the raw data has been sorted into symmetric and asymmetric matrices. The data has been analyzed using the analyzing program INGASORT. The level scheme of ³⁷Ar has been extended using the coincidence relationship and the relative intensities of the gamma transitions

[en] ³⁶Ar remains an exciting nucleus to understand the microscopic origins of shape coexistence, alpha-clustering and superdeformation. Shell model calculations have been performed on ³⁶Ar extensively in the past using several effective interactions. Investigated, In the present work, is the origin of the 3₁^- state of ³⁶Ar based on available experimental data and shell model calculation. The first 3^- level in ³⁶Ar has been interpreted as a mixed isospin state. The isospin mixing probability and the total mixing matrix element have been calculated. Calculated isospin-mixed energy eigenvalue is in excellent agreement with the experimental level energy

[en] We have already prepared two implanted targets (¹⁴N and ²²Ne) and characterized them (both surface and bulk) using X-ray photo electron spectroscopy (XPS), Scanning electron microscope (SEM), Rutherford backscattering Spectroscopy (RBS) and nuclear resonance reaction. It can also be possible to characterize the target surface by detecting the characteristic X-ray emitted from the excited target atom. These atoms can be excited by bombarding charge particles, X-rays or gamma rays. In our laboratory we have procured an X-ray source and a X-ray detection system from Moxtek, USA. Our primary motivation is to use this set up to characterize our targets to be used in nuclear astrophysics experiments. In this present work, we have tested the performance of the detector for different shaping time, system dead time. We have also performed some elemental analysis using known sample to validate our system