Nuclear Theory·nucl-th

Monday·February 12, 2024

15 papers—8 primary·7 cross-listed

01
[Submitted on 8 Feb 2024]
The unexpected uses of a bowling pin: exploiting $^{20}$ Ne isotopes for precision characterizations of collectivity in small systems
Giuliano Giacalone🇩🇪 · Benjamin Bally🇫🇷 · Govert Nijs🇨🇭 · Shihang Shen🇩🇪 · Thomas Duguet🇫🇷 · Jean-Paul Ebran🇫🇷 · Serdar Elhatisari🇹🇷 · Mikael Frosini🇫🇷 · Timo A. Lähde🇩🇪 · Dean Lee🇺🇸 · Bing-Nan Lu🇨🇳 · Yuan-Zhuo Ma🇺🇸 and 7 other authors
Whether or not femto-scale droplets of quark-gluon plasma (QGP) are formed in so-called small systems at high-energy colliders is a pressing question in the phenomenology of the strong interaction. For proton-proton or proton-nucleus collisions the answer is inconclusive due to the large theoretical uncertainties plaguing the description of these processes. While upcoming data on collisions of $^{16}$ O nuclei may mitigate these uncertainties in the near future, here we demonstrate the unique possibilities offered by complementing $^{16}$ O $^{16}$ O data with collisions of $^{20}$ Ne ions. We couple both NLEFT and PGCM ab initio descriptions of the structure of $^{20}$ Ne and $^{16}$ O to hydrodynamic simulations of $^{16}$ O $^{16}$ O and $^{20}$ Ne $^{20}$ Ne collisions at high energy. We isolate the imprints of the bowling-pin shape of $^{20}$ Ne on the collective flow of hadrons, which can be used to perform quantitative tests of the hydrodynamic QGP paradigm. In particular, we predict that the elliptic flow of $^{20}$ Ne $^{20}$ Ne collisions is enhanced by as much as 1.170(8) $_{stat.}$ (30) $_{syst.}$ for NLEFT and 1.139(6) $_{stat.}$ (39) $_{syst.}$ for PGCM relative to $^{16}$ O $^{16}$ O collisions for the 1% most central events. At the same time, theoretical uncertainties largely cancel when studying relative variations of observables between two systems. This demonstrates a method based on experiments with two light-ion species for precision characterizations of the collective dynamics and its emergence in a small system.
Comments:
17 pages, 14 figures. The Trajectum code can be found at https://sites.google.com/view/govertnijs/trajectum and plotting routines can be found at http://wilkevanderschee.nl/trajectum
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2402.05995 [pdf]
PRL(2025)·105 citations
02
[Submitted on 8 Feb 2024]
Exploring the competition between $α$ -decay and proton radioactivity: A comparative study of proximity potential formalisms
A. Adel · Karim H. Mahmoud · Haitham A. Taha
We have conducted a comprehensive and systematic study of the proton radioactivity and $α$ -decay half-lives of neutron-deficient nuclei. This investigation involved the utilization of various Proximity potentials and also considered the incorporation of thermal effects. For the half-life calculations, we employed both temperature-independent and temperature-dependent interaction potentials. We observed that proton radioactivity serves as the dominant mode of decay for nuclides situated very close to the proton drip-line. We explored a universal curve that examines the correlation between the decimal logarithm of experimental half-lives and the negative decimal logarithm of the penetrability for both proton radioactivity and $α$ -decay.
Comments:
11 pages,7 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2402.06069 [pdf]
NPA(2024)·7 citations
03
[Submitted on 9 Feb 2024]
The $ppp$ correlation function with a screened Coulomb potential
A. Kievsky🇮🇹 · E. Garrido🇪🇸 · M. Viviani🇮🇹 · M. Gattobigio🇫🇷
The correlation function is a useful tool to study the interaction between hadrons. The theoretical description of this observable requires the knowledge of the scattering wave function, whose asymptotic part is distorted when two or more particles are charged. For a system of three (or more) particles, with more than two particles asymptotically free and at least two of them charged, the asymptotic part of the wave function is not known in a closed form. In the present study we introduce a screened Coulomb potential and analyze the impact of the screening radius on the correlation function. As we will show, when a sufficiently large screening radius is used, the correlation function results almost unchanged if compared to the case in which the unscreened Coulomb potential is used. This fact allows the use of free asymptotic matching conditions in the solution of the scattering equation simplifying noticeably the calculation of the correlation function. As an illustration we discuss the $pp$ and $ppp$ correlation functions.
Comments:
14 pages, 4 figures, belonging to the collection Advances on Few-Body Problems in Physics, Few-Body Systems
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2402.06317 [pdf]
Few Body Syst.(2024)·5 citations
04
[Submitted on 9 Feb 2024]
Elliptic flow of deuterons in ultrarelativistic heavy-ion collisions
Radka Vozabova🇨🇿 · Boris Tomasik🇨🇿
We calculate the elliptic flow of deuterons in Pb+Pb collisions at 2.76 TeV per colliding nucleon-nucleon pair and show that it can be used to discriminate between direct statistical production and coalescence. The emission from the fireball is parametrized and tuned to reproduce transverse momentum spectra and the elliptic flow of protons and pions. Coalescence leads to higher deuteron elliptic flow than statistical production and agrees better with experimental data. We attribute this observation to the varying size of the nucleon-producing region for the emission in different azimuthal angles.
Comments:
12 pages, 10 figures, v2: references added, v3: parametrisation of model anisotropy better explained around eqs. 5 and 6, figures reformatted for better readability, content and results unchanged, accepted in Physical Review C
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2402.06327 [pdf]
PRC(2024)·7 citations
05
[Submitted on 9 Feb 2024]
Correlation between the Shape Coexistence and Stability in Mo and Ru isotopes
Mamta Aggarwal (1) · G. Saxena (2) · Pranali Parab (1)
In a rapidly changing shape phase region, the presence of shape coexistence and its possible impact on the decay modes and half $-$ lives, has been explored in astrophysically interesting Mo and Ru isotopes, in an extensive study within the microscopic theoretical framework using Nilsson Strutinsky Method and Relativistic Mean Field Model. The isotopic chains of Mo and Ru exhibit rapid shape phase transitions, triaxial $γ$ softness, shape instability along with many coexisting states mostly with oblate and triaxial shapes. Proton and neutron separation energies have been calculated and compared with the available data. Results obtained from both the formalisms are in good agreement with each other as well as the available experimental data. Our computed $β -$ decay half $-$ lives and separation energy for nuclei exhibiting shape coexistence were examined for the decay mode from second minima state of the parent nuclei to the ground or excited state of the daughter nuclei. The second minima state of the coexisting shapes in Mo and Ru isotopes, were seen to impact the structural properties, $β -$ decay half $-$ lives, separation energy and hence the stability of the nuclei.
Comments:
23 pages, 13 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2402.06403 [pdf]
NPA(2024)·7 citations
06
[Submitted on 9 Feb 2024]
Electron-nucleus scattering and the polarization sum rules
D.H.Jakubassa-Amundsen
A formal derivation of the polarization correlations between the incident electron and the scattered electron is given for a general class of transition operators. In correspondence to the case of bremsstrahlung emission, three sum rules for the polarization correlations are predicted, which reduce to the known one for potential scattering. Further examples, including the 1_2^+ and 2_1^+ excitations of the 12C nucleus and a 1^- excitation of the 208Pb nucleus, are discussed and the validity of the corresponding sum rules is investigated.
Comments:
12 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2402.06418 [pdf]
0 citations
07
[Submitted on 9 Feb 2024]
Reaction rate of the radiative capture proton by 10B
S.B. Dubovichenko · N.A. Burkova · A.S. Tkachenko · D.M. Zazulin
The 10B(p,{\gamma})11C reaction is of significant interest in nuclear astrophysics and in the field of controlled thermonuclear fusion. This reaction is one of the reactions of 11B production, which is carried out through the 10B(p,{\gamma})11C(\b{eta}+{\nu})11B chain. The rate of the 10B(p,{\gamma})11C reaction (occurring in the interiors of first-generation stars) can be of great importance for the amount of 10B and 11B observed today in the interstellar medium and in the Earth's crust. In thermonuclear reactors, structural elements containing boron can be used as neutron absorbers, etc. Therefore, in this work, within the framework of a modified potential cluster model with a classification of orbital states according to Young's diagrams and taking into account allowed and forbidden states, we examined the possibility of describing the available experimental data for the total cross sections of the radiative p10B capture to the ground state of the 11C nucleus at energies up to 1 MeV. It is shown that only on the basis of E1 and M1 transitions from the p10B scattering states, taking into account the first resonance for the ground state of the 11C nucleus, it is quite possible to explain the magnitude and shape of the experimental astrophysical S-factor. The work presents comparisons the astrophysical S-factors of the radiative p10B capture to the ground state of the 11C nucleus found by us with the experimental data available in the literature. Based on the obtained theoretical S-factor, the rate of this reaction was calculated in the temperature range from 0.01 to 1 T9. The calculated results for rates are approximated by a simple expression, which simplifies their use in applied thermonuclear and astrophysical research.
Comments:
10 P., 2 FIG., 1 TAB
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2402.06433 [pdf]
REPORTS OF THE ACADEMY OF SCIENCES OF THE…·0 citations
08
[Submitted on 9 Feb 2024]
Recent progress in the electroweak structure of light nuclei using quantum Monte Carlo methods
Garrett B. King🇺🇸 · Saori Pastore🇺🇸
Nuclei will play a prominent role in searches for physics beyond the Standard Model as the active material in experiments. In order to reliably interpret new physics signals, one needs an accurate model of the underlying nuclear dynamics. In this review, we discuss recent progress made with quantum Monte Carlo approaches for calculating the electroweak structure of light nuclei. We place particular emphasis on recent $β$ -decay, muon capture, $0 ν β β$ -decay, and electron scattering results.
Comments:
23 pages, 8 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2402.06602 [pdf]
Ann.Rev.Nucl.Part.Sci.(2024)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE