Nuclear Theory·nucl-th

Monday·June 25, 2018

8 papers—3 primary·5 cross-listed

04
[Submitted on 21 Jun 2018] (cross-list from nucl-ex)
A nucleation model analysis of neck emission yields in 124Sn+112,124Sn reactions at 26 MeV/nucleon
J. Gauthier🇺🇸 · M. Barbui🇺🇸 · X. Cao🇺🇸 · K. Hagel🇺🇸 · R. Wada🇺🇸 · S. Wuenschel🇺🇸 · J. B. Natowitz🇺🇸
A recent analysis of experimental ternary fission fragment yields using a nucleation moderated statistical equilibrium model reproduced observed yields with fairly good accuracy. In the present work, the same approach is applied to neck emission in peripheral and mid-peripheral 124Sn+112,124Sn collisions at 26A MeV. The model can reasonably reproduce the yields of lithium to silicon isotopes with realistic time and temperature values. A comparison is made between equilibrium constants derived from the present data and those previously obtained for ternary fission of 242Pu.
Comments:
Base on additional and more detailed analysis our team concluded that we cannot have full confidence in the results presented in this text
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1806.08432 [pdf]
0 citations
05
[Submitted on 22 Jun 2018] (cross-list from hep-ph)
Doubly-Charged Scalars in the Type-II Seesaw Mechanism: Fundamental Symmetry Tests and High-Energy Searches
P. S. Bhupal Dev🇺🇸 · Michael J. Ramsey-Musolf🇺🇸 · Yongchao Zhang🇺🇸
We analyze the sensitivity of low-energy fundamental symmetry tests to interactions mediated by doubly-charged scalars that arise in type-II seesaw models of neutrino mass and their left-right symmetric extensions. We focus on the next generation measurement of the parity-violating asymmetry in Møller scattering planned by the MOLLER collaboration at Jefferson Laboratory. We compare the MOLLER sensitivity to that of searches for charged lepton flavor violation (CLFV) and neutrinoless double beta-decay ( $0 ν β β$ -decay) as well as present and possible future high-energy collider probes. We show that for the simplest type-II seesaw scenario, CLFV searches have the greatest sensitivity. However, in a left-right symmetric extension where the scale of parity-breaking is decoupled from the $S U (2)_{R}$ -breaking scale, the MOLLER experiment will provide a unique probe of scalar triplet interactions in the right-handed sector for a doubly-charged scalar mass up to $\sim$ 10 TeV and help elucidate the mechanism of $0 ν β β$ -decay.
Comments:
13 pages, 9 figures and 1 table
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1806.08499 [pdf]
PRD(2018)·65 citations
06
[Submitted on 22 Jun 2018] (cross-list from hep-ph)
A framework for the chiral extrapolation of the charmed baryon ground-state masses
Yonggoo Heo🇹🇭 · Xioa-Yu Guo🇩🇪 · Matthias F.M. Lutz🇩🇪
We consider the chiral Lagrangian for charmed baryon fields with $J^{P} = \frac{1}{2}^{+}$ or $J^{P} = \frac{3}{2}^{+}$ quantum numbers. A chiral expansion framework for the baryon ground state masses is worked out to N $^{3}$ LO as to compute their dependence on the up, down and strange quark masses for finite box QCD lattice simulations. It is formulated in terms of on-shell meson and baryon masses. The convergence of such a scheme is illustrated with physical masses as taken from the PDG. The counter terms relevant at N $^{3}$ LO are correlated systematically by large- $N_{c}$ sum rules to leading and subleading order in a manner that keeps the renormalization scale invariance of the approach.
Comments:
33 pages, correction of some misprints
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
1806.08602 [pdf]
PRD(2018)·4 citations
07
[Submitted on 22 Jun 2018] (cross-list from cond-mat.supr-con)
Gap equation with pairing correlations beyond mean field and its equivalence to a Hugenholtz-Pines condition for fermion pairs
L. Pisani · P. Pieri · G. Calvanese Strinati
The equation for the gap parameter represents the main equation of the pairing theory of superconductivity. Although it is formally defined through a single-particle property, physically it reflects the pairing correlations between opposite-spin fermions. Here, we exploit this physical connection and cast the gap equation in an alternative form which explicitly highlights these two-particle correlations, by showing that it is equivalent to a Hugenholtz-Pines condition for fermion pairs. At a formal level, a direct connection is established in this way between the treatment of the condensate fraction in condensate systems of fermions and bosons. At a practical level, the use of this alternative form of the gap equation is expected to make easier the inclusion of pairing fluctuations beyond mean field. As a proof-of-concept of the new method, we apply the modified form of the gap equation to the long-pending problem about the inclusion of the Gorkov-Melik-Barkhudarov correction across the whole BCS-BEC crossover, from the BCS limit of strongly overlapping Cooper pairs to the BEC limit of dilute composite bosons, and for all temperatures in the superfluid phase. Our numerical calculations yield excellent agreement with the recently determined experimental values of the gap parameter for an ultra-cold Fermi gas in the intermediate regime between BCS and BEC, as well as with the available quantum Monte Carlo data in the same regime.
Comments:
24 pages, 13 figures
Subjects:
Superconductivity (cond-mat.supr-con); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
arXiv:
1806.08635 [pdf]
PRB(2018)·15 citations
08
[Submitted on 22 Jun 2018] (cross-list from physics.atom-ph)
Efimov effect in a $D$ -dimensional Born-Oppenheimer approach
D. S. Rosa · T. Frederico · G. Krein · M. T. Yamashita
We study a three-body system, formed by two identical heavy bosons and a light particle, in the Born-Oppenheimer approximation for an arbitrary dimension $D$ . We restrict $D$ to the interval $2 < D < 4$ , and derive the heavy-heavy $D$ -dimensional effective potential proportional to $1/ R^{2}$ ( $R$ is the relative distance between the heavy particles), which is responsible for the Efimov effect. We found that the Efimov states disappear once the critical strength of the heavy-heavy effective potential $1/ R^{2}$ approaches the limit $- (D - 2)^{2} /4$ . We obtained the scaling function for the $^{133}$ Cs- $^{133}$ Cs- $^{6}$ Li system as the limit cycle of the correlation between the energies of two consecutive Efimov states as a function of $D$ and the heavy-light binding energy $E_{2}^{D}$ . In addition, we found that the energy of the $(N + 1)^{th}$ excited state reaches the two-body continuum independently of the dimension $D$ when $E_{2}^{D} / E_{3}^{(N)} = 0.89$ , where $E_{3}^{(N)}$ is the $N^{th}$ excited three-body binding energy.
Subjects:
Atomic Physics (physics.atom-ph); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
arXiv:
1806.08638 [pdf]
J.Phys.B(2018)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE

A nucleation model analysis of neck emission yields in 124Sn+112,124Sn reactions at 26 MeV/nucleon

Doubly-Charged Scalars in the Type-II Seesaw Mechanism: Fundamental Symmetry Tests and High-Energy Searches

A framework for the chiral extrapolation of the charmed baryon ground-state masses

Gap equation with pairing correlations beyond mean field and its equivalence to a Hugenholtz-Pines condition for fermion pairs

Efimov effect in a D-dimensional Born-Oppenheimer approach

Affiliations

Efimov effect in a $D$ -dimensional Born-Oppenheimer approach