Program

P.31 -- Poster, NCTP-40

Date: Monday, 27 July 2015

Time: 14h00 - 15h30

Effects of pairing reentrance on the inverse nuclear level density parameter of hot rotating nuclei

Le Thi Quynh Huong (1,2) , Nguyen Quang Hung (3)

(1) Department of Natural Sciences, Nha Trang College of Education, Nha Trang City, Vietnam (2) Faculty of Physics and Engineering Physics, Ho Chi Minh University of Science, Ho Chi Minh City, Vietnam (3) School of Engineering, Tan Tao University, Tan Tao University Avenue, Tan Duc E.City, Duc Hoa, Long An Province, Vietnam

Angular momentum dependence of the inverse level density parameter $K$ in the excitation-energy region of about 30 – 40 MeV is studied within the finite-temperature Bardeen-Cooper-Schrieffer (FTBCS) theory that takes into account the noncollective rotation of the nucleus at nonzero values of $z$-projection $M$ of the total angular momentum. The comparison between the results obtained within the FTBCS as well as the case without pairing correlations and the experimental data for several medium-mass nuclei such as $^{108}$Cd, $^{109}$In, $^{112}$Sn, $^{113}$Sb, $^{122}$Te, $^{123}$I, $^{127}$Cs, shows that by including the pairing corrections the FTBCS reproduces quite well all experimental data, whereas the non-pairing case overestimates the data. As the result, within the FTBCS, there appears an effect that pairing correlations is first small at a given value of angular momentum $M$, which is close to its critical value MC, where pairing is completely disappeared, and zero temperature ($T$ = 0), increases with increasing $T$, and then decreases to vanish at high $T$. This effect is called the pairing reentrance.

Presenter: Le Thi Quynh Huong