Nuclear Theory·nucl-th

Monday·May 27, 2024

15 papers—5 primary·10 cross-listed

01
[Submitted on 23 May 2024]
Static and dynamic properties of atomic nuclei with high-resolution potentials
Alex Gnech🇺🇸 · Alessandro Lovato🇺🇸 · Noemi Rocco🇺🇸
We compute ground-state and dynamical properties of $^{4}$ He and $^{16}$ O nuclei using as input high-resolution, phenomenological nucleon-nucleon and three-nucleon forces that are local in coordinate space. The nuclear Schrödinger equation for both nuclei is accurately solved employing the auxiliary-field diffusion Monte Carlo approach. For the $^{4}$ He nucleus, detailed benchmarks are carried out with the hyperspherical harmonics method. In addition to presenting results for the binding energies and radii, we also analyze the momentum distributions of these nuclei and their Euclidean response function corresponding to the isoscalar density transition. The latter quantity is particularly relevant for lepton-nucleus scattering experiments, as it paves the way to quantum Monte Carlo calculations of electroweak response functions of $^{16}$ O.
Comments:
14 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2405.14916 [pdf]
PRC(2025)·8 citations
02
[Submitted on 24 May 2024]
Investigation of spectral properties of ^{11}Be in breakup reactions
Dinara Valiolda · Daniyar Janseitov · Vladimir Melezhik
We investigate the breakup of the ^{11}Be halo nuclei on a light target ^{12}C within quantum-quasiclassical approach in a wide range of the beam energy (5-67 MeV/nucleon) including bound states and low-lying resonances in different partial and spin states of ^{11}Be. The obtained results are in good agreement with existing experimental data at 67 MeV/nucleon. We also demonstrate that the developed computational scheme can be used for investigation of nuclei spectral properties in low-energy breakup experiments on different targets.
Comments:
16 pages, 8 figures,
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2405.15440 [pdf]
CPC(2025)·0 citations
03
[Submitted on 24 May 2024]
Principal components of nuclear mass models
X. H. Wu · P. W. Zhao
The principal component analysis approach is employed to extract the principal components contained in nuclear mass models for the first time. The effects coming from different nuclear mass models are reintegrated and reorganized in the extracted principal components. These extracted principal components are recombined to build new mass models, which achieve better accuracy than the original theoretical mass models. This indicates that the effects contained in different mass models can work together to improve the nuclear mass predictions with the help of the principal component analysis approach.
Comments:
8 pages, 3 figures, 1 table
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2405.15487 [pdf]
SCPMA(2024)·15 citations
04
[Submitted on 24 May 2024]
$K^{-} d \to π Λ N$ reaction with in-flight kaons for studying the $Λ N$ interaction
Shunsuke Yasunaga🇯🇵 · Daisuke Jido🇯🇵 · Takatsugu Ishikawa🇯🇵
The $Λ N$ invariant mass spectra for the reactions $K^{-} d \to π^{-} Λ p$ and $K^{-} d \to π^{0} Λ n$ are calculated for experimental study of isospin symmetry breaking in the $Λ N$ scattering at low energies, the difference in the scattering lengths and effective ranges of $Λ p$ and $Λ n$ systems. The calculations are performed for in-flight kaons with a momentum of 1000 MeV/c with employing partial wave analysis up to the p-wave for meson-baryon amplitudes and the spin-flip term for baryon-baryon amplitudes. Kinematic selection is utilized to suppress the background processes by selecting forward-emitting pions and higher momentum nucleons. It is worth noting that isospin symmetry breaking in the $Λ N$ system can be extracted from the difference of the $Λ N$ invariant mass spectra between the $K^{-} d \to π^{-} Λ p$ and $K^{-} d \to π^{0} Λ n$ reactions.
Comments:
15 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2405.15534 [pdf]
PRC(2025)·2 citations
05
[Submitted on 24 May 2024]
Constraints for rare electron-capture decays mimicking detection of dark-matter particles in nuclear transitions
Aagrah Agnihotri🇫🇮 · Jouni Suhonen🇫🇮 · Hong Joo Kim🇰🇷
We give for the first time, theoretical estimates of unknown rare electron-capture (EC) decay branchings of $^{44}$ Ti, $^{57}$ Co, and $^{139}$ Ce, relevant for searches of (exotic) dark-matter particles. The nuclear-structure calculations have been done exploiting the nuclear shell model (NSM) with well-established Hamiltonians and an advanced theory of $β$ decay. In the absence of experimental measurements of these rare branches, these estimates are of utmost importance for terrestrial searches of dark-matter particles, such as axionic dark matter in the form of axion-like particles (ALPs), anapole dark matter, and dark photons in nuclear transitions. Predictions are made for EC-decay rates of 2 $^{n d}$ -forbidden unique (FU) and 2 $^{n d}$ -forbidden non-unique (FNU) EC transitions that can potentially mimic dark-matter-particle detection in dedicated underground experiments designed to observe the absence of the corresponding nuclear electromagnetic transitions.
Comments:
6 pages,3 figures in the main article and 2 pages in the supplemental material
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2405.15591 [pdf]
PRL(2024)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE

Static and dynamic properties of atomic nuclei with high-resolution potentials

Investigation of spectral properties of ^{11}Be in breakup reactions

Principal components of nuclear mass models

K−d→πΛN reaction with in-flight kaons for studying the ΛN interaction

Constraints for rare electron-capture decays mimicking detection of dark-matter particles in nuclear transitions

Affiliations

$K^{-} d \to π Λ N$ reaction with in-flight kaons for studying the $Λ N$ interaction