arXiv subjects

Jing-Jing Guo

Publications and source records attributed to Jing-Jing Guo.

4 recordsLinked to original sources

arXiv2026

Signatures of a bilayer structure in the photoelectron spectrum of B$_{80}^-$

Recent photoelectron spectroscopy of B$_{80}^-$ was interpreted in terms of a fullerene-like cage structure. During our systematic investigation of medium-sized boron clusters, we identified a $D_{3h}$-symmetric bilayer isomer whose simulated photoelectron spectrum reproduces the principal features of the experimental photoelectron spectrum within 0.04 eV. The bilayer is energetically competitive with previously proposed structures and remains dynamically stable up to 1400 K according to ab initio molecular dynamics and vibrational analyses. Its electronic structure exhibits a 0.72 eV HOMO-LUMO gap and strong interlayer aromaticity, reflected by a NICS(0) value of $-44.3$ ppm in the interlayer B-B bonding region. These findings reveal a stable bilayer motif in the B$_{80}$ energy landscape and support its viability as a possible alternative structural assignment for the experimentally observed B$_{80}^-$.

physics.atm-clus↗

arXiv2023

A Novel Isomer of Volleyballene Sc$_{20}$C$_{60}$

The Stone-Wales defect is a well-known and significant defective structure in carbon materials, impacting their mechanical, chemical, and electronic properties. Recently, a novel metal-carbon nanomaterial named Volleyballene has been discovered, characterized by a C-C bond bridging two carbon pentagons. Using first-principles calculations, a stable Stone-Wales-defective counterpart of Volleyballene, exhibiting $T_h$ symmetry, has been proposed by rotating the C-C bond by 90$°$. Although its binding energy per atom is slightly higher than Volleyballene ($ΔE_b$ = 0.009 eV/atom), implying marginally lower structural stability, it can maintain its bond structure until the effective temperature reaches about 1538.56 K, indicating greater thermodynamic stability. Additionally, its highest vibration frequency is 1346.2 cm$^{-1}$, indicating strong chemical bond strength. A theoretical analysis of the Sc$_{20}$C$_{60}$+Sc$_{20}$C$_{60}$ binary systems highlights that the stable building block may be applied in potential nano-assembly.

cond-mat.mtrl-sci↗

arXiv2019

Strong Decays of observed $Λ_c$ Baryons in the $^3P_0$ Model

The strong decay widths and some important branching ratios of possible Okubo-Zweig-Iizuka(OZI)-allowed strong decay channels of $Λ_c(2595)^+$, $Λ_c(2625)^+$, $Λ_c(2765)^+$ ($Σ_c(2765)^+$), $Λ_c(2860)^+$, $Λ_c(2880)^+$ and $Λ_c(2940)^+$ are computed in a $^{3}P_{0}$ model, and possible assignments of these $Λ_c$ are given. (1), $Λ_c(2595)^+$ and $Λ_c(2625)^+$ are possibly the $1P$-wave charmed baryons $Λ_{c1}(\frac{1}{2}^-)$ and $Λ_{c1}(\frac{3}{2}^-)$, respectively. (2), $Λ_c(2765)^+$ ($Σ_c(2765)^+$) seems impossibly the $1P$-wave $Λ_{c}$, it could be the $2S$-wave or $1D$-wave charmed baryon. So far, the experimental information has not been sufficient for its identification. (3), $Λ_c(2860)^+$ seems impossibly $2S$-wave charmed baryon, it may be the $P$-wave $\tildeΛ_{c2}^{ }(\frac{3}{2}^-)$ or $\tildeΛ_{c2}^{ }(\frac{5}{2}^-)$, it could also be the $D$-wave $\checkΛ_{c1}^{2}(\frac{1}{2}^+)$ or $\checkΛ_{c1}^{2}(\frac{3}{2}^+)$. If the hypothesis that $Λ_c(2860)^+$ has $J^P={3\over 2}^+$ is true, $Λ_c(2860)^+$ is possibly the $D$-wave $\checkΛ_{c1}^{2}(\frac{3}{2}^+)$ which has a predicted branching ratio $R=Γ(Σ_c(2520)π)/Γ(Σ_c(2455)π)=2.8$. (4), $Λ_c(2880)^+$ is impossibly a $1P$-wave or $2S$-wave charmed baryon, it may be a $D$-wave $\checkΛ_{c3}^{2}(\frac{5}{2}^+)$ with $Γ_{total}=1.3$ MeV. The predicted branching ratio $R=Γ(Σ_c(2520)π)/Γ(Σ_c(2455)π)=0.35$, which is consistent with experiment. (5), $Λ_c(2940)^+$ is the $P$-wave $\tildeΛ_{c2}^{ }(\frac{3}{2}^-)$ or $\tildeΛ_{c2}^{ }(\frac{5}{2}^-)$, it is also possibly the $D$-wave $\checkΛ_{c3}^{2}(\frac{5}{2}^+)$ or $\checkΛ_{c3}^{2}(\frac{7}{2}^+)$.

hep-ph↗

arXiv2018

Identification of the newly observed $Σ_b(6097)^\pm$ baryons from their strong decays

Two bottom $Σ_b(6097)^\pm$ baryons were observed in the final states $Λ_b^0π^-$ and $Λ_b^0π^+$ in $pp$ collision by LHCb collaboration, whose masses and widths were measured. In a $^{3}P_{0}$ model, the strong decay widths of two ground $S$-wave and seven excited $P$-wave $Σ_b$ baryons have been systematically computed. Numerical results indicate that the newly observed $Σ_b(6097)^\pm$ are very possibly $Σ_{b2}^1({3\over 2}^-)$ with $J^P={3\over 2}^-$ or $Σ_{b2}^1({5\over 2}^-)$ with $J^P={5\over 2}^-$. The predicted decay widths of $Σ_b(6097)^\pm$ are consistent with experimental measurement from LHCb. In particular, it may be possible to distinguish these two assignments through ratios $Γ({Σ_b(6097)^\pm\to Σ_b^\pmπ^0})/Γ({Σ_b(6097)^\pm\to Σ_b^{*\pm}π^0})$, which can be measured by experiments in the future. In the meantime, our results support the assignments that $Σ_b^\pm$ and $Σ_b^{*\pm}$ are the ground $S$-wave $Σ_b$ baryons with $J^P={1\over 2}^+$ and $J^P={3\over 2}^+$, respectively.

hep-ph↗