Ashok Kumar Jain
Articles written in Pramana – Journal of Physics
Volume 43 Issue 4 October 1994 pp 339-351
Level structures in the odd-odd nucleus^{180}Re
Ashok Kumar Jain Prakash C Sood Raymond K Sheline
Experimental data on energy levels of the odd-odd deformed nucleus^{180}Re obtained from radioactive-decay and heavy-ion reaction studies are analysed to deduce spin-parity and configuration assignments for the six observed rotational bands based on the selection rules for fast beta transitions, criteria for the relative-energy ordering of the triplet and singlet bandheads, two-particle-plus-rotor model calculations including Coriolis mixing, rotational energy systematics involving staggering features, and considerations of gyromagnetic ratios, signature splittings and rotational band alignments.
Volume 53 Issue 2 August 1999 pp 243-251
Trace formula for level density of a spherical billiard
Sham Sunder Malik Manisha Dudeja Ashok Kumar Jain
A trace formula for the oscillating part of the level density for a spherical billiard has been obtained in spherical polar coordinates. The Jacobian of stability and the length of the orbits are obtained from the classical mechanics of the problem. The same formula is applicable to both the planar and the diametric orbits. Numerical results have been obtained with this formula and compared with the results from exact quantum theory, EBK quantization, and Balian and Bloch.
Volume 57 Issue 2-3 August 2001 pp 611-622
Magnetic rotation and chiral symmetry breaking
The deformed mean field of nuclei exhibits various geometrical and dynamical symmetries which manifest themselves as various types of rotational and decay patterns. Most of the symmetry operations considered so far have been defined for a situation wherein the angular momentum coincides with one of the principal axes and the principal axis cranking may be invoked. New possibilities arise with the observation of rotational features in weakly deformed nuclei and now interpreted as magnetic rotational bands. More than 120 MR bands have now been identified by filtering the existing data. We present a brief overview of these bands. The total angular momentum vector in such bands is tilted away from the principal axes. Such a situation gives rise to several new possibilities including breaking of chiral symmetry as discussed recently by Frauendorf. We present the outcome of such symmetries and their possible experimental verification. Some possible examples of chiral bands are presented.
Volume 89 Issue 5 November 2017 Article ID 0075 Research Article
BHOOMIKA MAHESHWARI SWATI GARG ASHOK KUMAR JAIN
We show for the first time that the generalized seniority scheme explains reasonably well the $B(E3)$ systematics for the $(0^{+} → 3^{−}_{1})$ transitions in the Sn isotopes, which are odd-tensor $E3$ transitions connecting different seniority states $(\Delta\upsilon = 2)$. Additionally, we also present large scale shell model (LSSM) calculations to support our interpretation. The generalized seniority scheme points to the octupole character of these 3− states in Sn isotopes.
Volume 92 Issue 3 March 2019 Article ID 0035 Research Article
Test of isospin conservation in thermal neutron-induced fission of $^{245}Cm$
We have recently shown that the general trends of partition-wise fission fragment mass distribution in heavy-ion-induced compound nuclear (CN) fission of heavy nuclei can be reproduced reasonably well by using theconcept of isospin conservation, hence providing a direct evidence of isospin conservation in neutron-rich systems [Jain
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