Nuclear Theory·nucl-th

Friday·May 27, 2016

13 papers—5 primary·8 cross-listed

01
Effects of level inversion on the Coulomb displacement energies of the Ar-K isobaric analog state pairs
Zaijun Wang · Xiaoyong Guo · Renli Xu
The Coulomb displacement energies of the neutron-rich Ar-K isobaric analog state pairs with mass number $A = 35 - 47$ are calculated within the relativistic mean field model and the effects of level inversion on the Coulomb displacement energies of the Ar-K isobaric analog state pairs are studied. The calculations are carried out in two cases, with and without consideration of the possible $2 s_{1/2}$ and $1 d_{3/2}$ proton level inversion of the neutron-rich Ar isotopes. Results show that the $2 s_{1/2}$ and $1 d_{3/2}$ level inversion of the neutron-rich Ar isotopes may reduce the Coulomb displacement energy by 0.06 $\sim$ 0.17 MeV for the Ar-K isobaric analog state pairs. The results may provide a reference for experimental investigations of nuclear level inversion and a new test of the relativistic mean field model.
nucl-th1 citation
02
Shape vibrations and quasiparticle excitations in the lowest 0+ excited state of the Erbium isotopes
Fang-Qi Chen · J. Luis Egido
The ground and first excited 0+ states of the {156-172}Er isotopes are analyzed in the framework of the generator coordinate method. The shape parameter beta is used to generate wave functions with different deformations which together with the two-quasiparticle states built on them provide a set of states. An angular momentum and particle number projection of the latter spawn the basis states of the generator coordinate method. With this ansatz and using the separable pairing plus quadrupole interaction we obtain a good agreement with the experimental spectra and E2 transition rates up to moderate spin values. The structure of the wave functions suggests that the first excited 0+ states in the soft Er isotopes are dominated by shape fluctuations, while in the well deformed Er isotopes the two-quasiparticle states are more relevant. In between both degrees of freedom are necessary .
nucl-thPRC(2016)·12 citations
03
Reply to comments on `Structure effects in the $^{15}$ N( $n, γ$ ) $^{16}$ N radiative capture reaction from the Coulomb dissociation of $^{16}$ N'
Shubhchintak · Neelam · R. Chatterjee
We reply to the comments (arXiv:1605.07499 [nucl-th]) on "Structure effects in the $^{15}$ N( $n, γ$ ) $^{16}$ N radiative capture reaction from the Coulomb dissociation of $^{16}$ N". We have investigated the issue of "energy dependence of branching ratios" and believe that this energy dependence is due to the proper inclusion of the non-resonant continuum in the post-form reaction theory. Interestingly, this energy dependence is sensitive to the relative orbital angular momentum content of the state. We reiterate that we have attempted to resolve the discrepancy in the spectroscopic factors of low-lying $^{16}$ N levels and that it is essential to know the low energy $^{15}$ N( $n, γ$ ) $^{16}$ N capture cross section, especially below 0.25 MeV.
nucl-thPRC(2016)·0 citations
04
Symmetric cumulants and event-plane correlations in Pb+Pb collisions
Giuliano Giacalone🇫🇷 · Li Yan🇫🇷 · Jacquelyn Noronha-Hostler🇺🇸 · Jean-Yves Ollitrault🇫🇷
The ALICE Collaboration has recently measured the correlations between amplitudes of anisotropic flow in different Fourier harmonics, referred to as symmetric cumulants. We derive approximate relations between symmetric cumulants involving $v_{4}$ and $v_{5}$ and the event-plane correlations measured by ATLAS. The validity of these relations is tested using event-by-event hydrodynamic calculations. The corresponding results are in better agreement with ALICE data than existing hydrodynamic predictions. We make quantitative predictions for three symmetric cumulants which are not yet measured.
nucl-thhep-phnucl-exPRC(2016)·67 citations
05
Impact of the neutron matter equation of state on neutron skin and neutron drip lines in chiral effective field theory
Francesca Sammarruca · Yevgen Nosyk
We present predictions of the binding energy per nucleon and the neutron skin thickness in highly neutron-rich isotopes of Oxygen, Magnesium, and Aluminum. The calculations are carried out at and below the neutron drip line as predicted by our model. The nuclear properties are obtained via an energy functional whose input is the equation of state of isospin-asymmetric infinite matter. The latter is based on a microscopic derivation of the energy per particle in neutron matter applying chiral few-nucleon forces together with a phenomenological model for the equation of state of symmetric nuclear matter. We highlight the impact of the neutron matter equation of state at different orders of chiral effective field theory on neutron skins and the binding energy per particle and quantify the uncertainty carried by our predictions.
nucl-thPRC(2016)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE

Effects of level inversion on the Coulomb displacement energies of the Ar-K isobaric analog state pairs

Shape vibrations and quasiparticle excitations in the lowest 0+ excited state of the Erbium isotopes

Reply to comments on `Structure effects in the 15N(n,γ)16N radiative capture reaction from the Coulomb dissociation of 16N'

Symmetric cumulants and event-plane correlations in Pb+Pb collisions

Impact of the neutron matter equation of state on neutron skin and neutron drip lines in chiral effective field theory

Affiliations

Reply to comments on `Structure effects in the $^{15}$ N( $n, γ$ ) $^{16}$ N radiative capture reaction from the Coulomb dissociation of $^{16}$ N'