Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G13: Nuclear Structure
8:30 AM–10:18 AM,
Sunday, April 14, 2019
Sheraton
Room: Plaza Court 2
Sponsoring
Unit:
DNP
Chair: Alexandra Gade, Michigan State University/ NSCL
Abstract: G13.00001 : Level densities in deformed nuclei beyond the mean-field approximation*
8:30 AM–8:42 AM
View Presentation Abstract
Presenter:
Paul Fanto
(Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, CT 06520)
Authors:
Paul Fanto
(Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, CT 06520)
Yoram Alhassid
(Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, CT 06520)
Nuclear level densities are important inputs to the Hauser-Feshbach theory of compound nucleus reactions. Microscopic calculations of level densities often rely on the mean-field approximation, which underestimates level densities in deformed nuclei [1]. The static-path plus random-phase approximation (SPA+RPA) includes large-amplitude thermal fluctuations and small-amplitude time-dependent quantal fluctuations beyond the mean field [2,3]. We investigate how much of the rotational enhancement of the level density is recovered in the SPA+RPA by benchmarking the level densities calculated with a quadrupole-quadrupole interaction against exact results calculated with the auxiliary-field Monte Carlo method [4].
[1] Y. Alhassid et al., Phys. Rev. C 93, 044320 (2016).
[2] H. Attias and Y. Alhassid, Nucl. Phys. A 625, 565 (1997).
[3] B. Lauritzen et al., Phys. Lett. B 246, 329 (1990).
[4] Y. Alhassid, in Emergent Phenomena in Atomic Nuclei from Large-Scale Modeling: a Symmetry-Guided Perspective, ed. by K. D. Launey (World Scientific, Singapore, 2017), pp. 267-268.
*This work was supported in part by the U.S. DOE grant No. DE-FG02-91ER40608 and by the DOE NNSA SSGF under cooperative agreement No. NA-0003864.
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