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Nuclear Theory·nucl-th

Friday·August 7, 2020

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    Effects of QCD critical point on light nuclei production

    Kai-Jia Sun🇺🇸 · Che Ming Ko🇨🇳 · Feng Li🇺🇸

    Using the nucleon coalescence model, which can naturally take into account the correlations in the nucleon density distribution, we study the effects of QCD critical point on light nuclei production in relativistic heavy-ion collisions. We find that the yield ratio of proton (), deuteron () and triton () increases monotonically with the nucleon density correlation length, which is expected to increase significantly near the critical point in the QCD phase diagram. Our study thus demonstrates that the yield ratio can be used as a sensitive probe of the QCD critical phenomenon. We further discuss the relation between the QCD phase transitions in heavy-ion collisions and the possible non-monotonic behavior of \pdt~in its collision energy dependence.

    nucl-thhep-phPLB(2021)·27 citations
  2. 02

    Pseudospin symmetry and octupole correlations for multiple chiral doublets in 131Ba

    Y. P. Wang🇨🇳 · Y. Y. Wang🇨🇳 · J. Meng🇨🇳

    A reflection-asymmetric triaxial particle rotor model with three quasiparticles and a reflection-asymmetric triaxial rotor is developed, and applied to investigate the observed multiple chiral doublets (Mḩi}D) candidates with octupole correlations in 131Ba, i.e., two pairs of positive-parity bands D3-D4 and D5-D6, as well as one pair of negative-parity bands D7-D8. The energy spectra, the energy staggering parameters, the B(M1)/B(E2) ratios, and the B(E1)/B(E2) ratios are reproduced well. The chiral geometries for these Mḩi}D candidates are examined by the azimuthal plots, and the evolution of chiral geometry with spin is clearly demonstrated. The intrinsic structure for the positive-parity bands is analyzed and the possible pseudospin-chiral quartet bands are suggested.

    nucl-thPRC(2020)·24 citations
  3. 03

    Shape Coexistence in Hot Rotating 100 Nb

    Mamta Aggarwal

    Temperature and angular momentum induced shape changes in the well deformed 100 Nb have been investigated within the theoretical framework of Statistical theory combined with triaxially deformed Nilson potential and Strutinsky prescription. Two shape coexistence, one in the ground state of 104 Nb between oblate and triaxial shapes and another one between oblate and rarely seen prolate non-collective shapes in excited hot rotating 100 Nb at the mid spin values around 14-16h are reported for the first time. The level density parameter indicates the influence of the shell effects and changes drastically at the shape transition. The band crossing is observed at the sharp shape transition.

    nucl-th0 citations
  4. 04

    Shape Transition to a Rare Shape Phase of Prolate Non-collective in A = 100 Isobars

    Mamta Aggarwal

    A theoretical investigation on the shape transitions with neutron number, temperature and spin for A 100 isobars of Z42 to 50 is presented. A variety of shape transitions are observed while moving from neutron rich 100 Mo to proton rich 100 Sn with predominant triaxial shapes. Temperature and spin induced shape transitions are explored within the microscopic theoretical framework of and statistical theory of hot rotating nuclei. Prolate non-collective which is a rare shape phase is reported in this mass region on the proton rich side of the nuclear chart.

    nucl-th0 citations
  5. 05

    Investigation of Quark Distributions in a Family of Pentaquarks using the Thomas-Fermi Quark Model

    Mohan Giri🇺🇸 · Suman Baral🇳🇵 · Gopi C. Kaphle🇳🇵 · Nirmal Dangi🇳🇵 · Sudip Shiwakoti🇺🇸 · Leonardo Bardomero🇺🇸 · Paul Lashomb🇺🇸 · Walter Wilcox🇺🇸

    Using the Thomas-Fermi quark model, a collective, spherically symmetric density of states is created to represent a gas of interacting fermions with various degeneracies at zero temperature. Over a family of multi-pentaquarks, color interaction probabilities are obtained after averaging over all the possible configurations. It is found that three different Thomas-Fermi functions are necessary for light, charm, and anti-charm quarks. These are assumed to be linearly related by proportionality constants resulting in consistency conditions. We analyze these conditions and find that they lead to an interesting pattern of spherical quark distributions.

    nucl-thhep-phCommun.Theor.Phys.(2021)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE