Speaker
Dr
Subhendu Rajbanshi
(Department of Physics, Dum Dum Motijheel College, Dum Dum)
Description
Atomic nuclei possess a wide variety of shapes in both their ground and excited states. The shapes may range from spherical to deformed, from quadrupole to octupole, and even more exotic shapes, such as super-deformed and tetrahedral. For deformed nuclei, they in general
possess an axially symmetric shape. The loss of axial symmetry would lead to a triaxial shape. The wobbling motion and chirality are regarded as fingerprints of stable triaxial nuclei. Evidence for wobbling (collectively enhanced E2 transitions between the one- and
zero-phonon rotational bands) has been observed only in odd-A triaxial strongly deformed nuclei around Z ~ 72, N ~ 94 though, Bohr and Mottelson had predict it for the triaxial even-even nuclei many years ago.
A recent study on the even-even 138Nd nucleus hints that wobbling mode may exist in the low and medium spin triaxial deformed states. Similar evidence of the triaxial deformed band has been explored above the 10+ excited state in 142Gd. To investigate the possibility of wobbling mode in 142Gd above this state an experiment has been performed at TIFR, Mumbai in which the nucleus of interest populated with ~ 35% of the total cross-section. The newly observed connecting transitions and their electromagnetic properties are similar to those of wobbling excitation but yet not confirmed. This will be discussed in details.
| Summary | The extreme excitation mechanism, wobbling, in 142Gd has been investigated using the gammma ray spectroscopic technique via the state of art clover detector array INGA at TIFR. The previously assigned triaxial deformed band and newly observed gamma transitions have may been exhibited the phenomenon of wobbling though yet to be confirmed through the stringent test of the electromagnetic properties. |
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Primary author
Dr
Subhendu Rajbanshi
(Department of Physics, Dum Dum Motijheel College, Dum Dum)
Co-authors
Prof.
Asimananda Goswami
(Saha Institute of Nuclear Physics)
Dr
Chandani Palshetkar
(Tata Institute of Fundamental Research)
Mr
Farhan Babra
(Tata Institute of Fundamental Research)
Dr
G. Mukherjee
(Variable Energy Cyclotron Centre)
Dr
Haridas Pai
(SINP)
Mr
Md. Sazedur Laskar
(Tata Institute of Fundamental Research)
Ms
Prithwijita Ray
(Saha Institute of Nuclear Physics, HBNI, Kolkata 700064, India)
Prof.
R. Palit
(Tata Institute of Fundamental Research)
Mr
RANABIR BANIK
(VARIABLE ENERGY CYCLOTRON CENTRE)
Dr
S. Bhattacharyya
(Variable Energy Cyclotron Centre)
Mr
SAJAD ALI
(SENIOR RESEARCH FELLOW)
Mr
Soumik Bhattacharya
(VARIABLE ENERGY CYCLOTRON CENTRE)
