Measurement of giant dipole resonance width at low temperature: A new experimental perspective

Autor:	G. Mukherjee, S. Mukhopadhyay, Surajit Pal, Sabitra Kundu, H. Pai, Srijit Bhattacharya, R. Pandey, T. K. Rana, S.R. Banerjee, M. Gohil, Deepak Pandit, A. De, C. Bhattacharya, J. K. Meena, Soumik Bhattacharya, K. Banerjee
Rok vydání:	2012
Předmět:	Physics Nuclear and High Energy Physics Angular momentum Spectrometer Nuclear Theory FOS: Physical sciences Dipole Nuclear fusion Neutron Nuclear Experiment (nucl-ex) Atomic physics Multiplicity (chemistry) Nuclear Experiment Ground state Adiabatic process
Zdroj:	Physics Letters B. 709:9-13
ISSN:	0370-2693
DOI:	10.1016/j.physletb.2012.01.059
Popis:	The systematic evolution of the giant dipole resonance (GDR) width in the temperature region of 0.9 ~ 1.4 MeV has been measured experimentally for 119Sb using alpha induced fusion reaction and employing the LAMBDA high energy photon spectrometer. The temperatures have been precisely determined by simultaneously extracting the vital level density parameter from the neutron evaporation spectrum and the angular momentum from gamma multiplicity filter using a realistic approach. The systematic trend of the data seems to disagree with the thermal shape fluctuation model (TSFM). The model predicts the gradual increase of GDR width from its ground state value for T > 0 MeV whereas the measured GDR widths appear to remain constant at the ground state value till T ~ 1 MeV and increase thereafter indicating towards a failure of the adiabatic assumption of the model at low temperature. Submitted to Physics Letters B (6 pages, 3 figures, 1 table)
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24b725d6607ca2c71be2522ff14fee43 https://doi.org/10.1016/j.physletb.2012.01.059 Zobrazit plný text záznamu Full Text from ScienceDirect