Valence space techniques and QRPA vibrational mass parameters

21st International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei

Deloncle, I.^1,2 ; Lechaftois, F.^2 ; Pèru, S.^2

CSNSM, IN2P3/CNRS, Orsay Campus

91405, France^1

CEA, DAM, DIF, Arpajon

91680, France^2

关键词: Computation time;    Density dependent;    Mass parameter;    Mean field;    Quasi particles;    Random phase approximations;    Time reduction;    Transition probabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/724/1/012012/pdf
DOI  :  10.1088/1742-6596/724/1/012012

来源: IOP

【 摘 要 】

The vibrational mass parameters entering the quadrupolar 5DCH Hamiltonian are commonly obtained neglecting beyond mean-field correlations and the dynamical mean-field rearrangement. The Quasiparticle Random Phase Approximation (QRPA) framework would allow to avoid these disadvantages [1], if the computation time, when using density dependent force, was not prohibitive. Here, a significant time reduction is obtained by applying valence space (VS) techniques (energy cut-off and inert core) in QRPA calculations. The VS techniques allow to probe the physical content of the mass parameter. The QRPA mass parameter exhibit robustness toward VS limitations contrarily to the intrinsic QRPA outputs, that show deceptive appearance when an inert core is used. Excited states energy, and associated transition probabilities, should not be considered for optimizing the valence space limits.