Article
Astronomy & Astrophysics
P. Capel, D. R. Phillips, H-W Hammer
Summary: In this study, the breakup of Be-11 was calculated using Halo Effective Field Theory and the Dynamical Eikonal Approximation, with the inclusion of an effective Be-10-n-target force. The results show an improved description of neutron-energy and angular spectra on a C-12 target, especially near the Be-11 5/2(+) state. By adjusting the range parameters of the three-body force, a reasonable description of data in the region of the 3/2(+) Be-11 state was also achieved, demonstrating the sensitivity of the overlap integral structure governing Be-11 s-to-d-state transitions induced by the three-body force.
Article
Physics, Nuclear
C. Hebborn, P. Capel
Summary: One-nucleon knockout reactions provide valuable insight into the single-particle structure of nuclei. When applied to one-neutron halo nuclei, they can be effectively modeled using halo effective field theory (halo-EFT). In this study, the halo-EFT descriptions of Be-11 and C-15 show excellent agreement with experimental data.
Article
Physics, Nuclear
Maheshwor Poudel, Daniel R. Phillips
Summary: This study applies an effective field theory to investigate low-energy He-3-alpha elastic scattering and computes the high-order amplitude. By analyzing recent measurement data, it is found that including data on the analyzing power is crucial for determining the sign of the p-wave splitting. The combination of the analyzing power and SONIK data effectively constrain all the effective-range parameters.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2022)
Article
Physics, Nuclear
Shung-Ichi Ando
Summary: This study focuses on an effective field theory for nuclear reactions at low energies, particularly in constructing an EFT for the radiative alpha capture on C-12 at the Gamow-peak energy. By applying the EFT to various reactions and estimating the S-E1 factor at the T-G energy, the study provides insights into the application of EFTs in low-energy nuclear reactions.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Astronomy & Astrophysics
Sujatha Ramakrishnan, Aseem Paranjape, Ravi K. Sheth
Summary: Researchers have proposed an algorithm to address the correlation between galaxy properties and large-scale environments in large-scale sky surveys. By preserving the correlations between halo properties and intermediate-scale tidal environments, the algorithm accurately maintains the large-scale assembly bias of haloes, significantly expanding the reach of simulations in halo mass and number density. This leads to a 45% improvement in bias signal for 30-particle haloes, reducing the cost of mock catalogues for future weak lensing and redshift space distortion studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Physics, Nuclear
Zhen Wang, Dong Bai, Zhongzhou Ren
Summary: The improved version of the density-dependent cluster model (DDCM+), which accounts for the anisotropy and polarization effects of surface diffuseness due to nuclear deformation, is developed to optimize alpha-decay calculations. The systematic calculations on alpha-decay half-lives for 157 even-even nuclei show good agreement with experimental data and demonstrate the high reliability of the improved model.
Article
Physics, Nuclear
Cong Pan, Myung-Ki Cheoun, Yong-Beom Choi, Jianmin Dong, Xiaokai Du, Xiao-Hua Fan, Wei Gao, Lisheng Geng, Eunja Ha, Xiao-Tao He, Jinke Huang, Kun Huang, Seonghyun Kim, Youngman Kim, Chang-Hwan Lee, Jenny Lee, Zhipan Li, Zhi-Rui Liu, Yiming Ma, Jie Meng, Myeong-Hwan Mun, Zhongming Niu, Panagiota Papakonstantinou, Xinle Shang, Caiwan Shen, Guofang Shen, Wei Sun, Xiang-Xiang Sun, Jiawei Wu, Xinhui Wu, Xuewei Xia, Yijun Yan, To Chung Yiu, Kaiyuan Zhang, Shuangquan Zhang, Wei Zhang, Xiaoyan Zhang, Qiang Zhao, Ruyou Zheng, Shan-Gui Zhou
Summary: This paper extends the point-coupling DRHBc theory to odd -A and odd-odd nuclei and examines its applicability by calculating the ground-state properties of odd -A Nd isotopes. The results show good agreement with experimental data, paving the way for constructing a DRHBc mass table that includes all even-even, odd -A, and odd-odd nuclei in the nuclear chart.
Article
Physics, Nuclear
K. Y. Zhang, S. Q. Zhang, J. Meng
Summary: A microscopic self-consistent triaxial relativistic Hartree-Bogoliubov theory in continuum (TRHBc) is established and applied to study the halo phenomenon in aluminum isotopes. The theory takes into account triaxiality, pairing correlations, and continuum effects. The results reproduce experimental data well and predict the properties of the neutron-richest odd-odd aluminum isotope observed so far, including its shape, separation energy, and radius.
Article
Physics, Nuclear
Seonghyun Kim, Myeong-Hwan Mun, Myung-Ki Cheoun, Eunja Ha
Summary: The study explores ground state properties of Pb isotopes between neutron and proton drip-lines using the deformed relativistic Hartree-Bogoliubov theory in continuum, identifying candidates for nuclear shape coexistence and determining neutron skin thickness compared to experimental data. The results show consistency with recent reports on shape coexistence and neutron skin thickness of certain Pb isotopes.
Article
Multidisciplinary Sciences
Xiang-Xiang Sun, Shan-Gui Zhou
Summary: The rotational excitation of deformed halo nuclei was explored using the angular momentum projection in the DRHBc theory, revealing consistent behavior of the halo structure in different rotational states. The study demonstrated typical shape decoupling effects in rotating deformed halo nuclei.
Article
Astronomy & Astrophysics
Enia Xhakaj, Alexie Leauthaud, Johannes Lange, Andrew Hearin, Benedikt Diemer, Neal Dalal
Summary: This paper investigates the impact of secondary halo properties on the galaxy-galaxy lensing observable Delta sigma, focusing on the effect of mass accretion rate (MAR). The study shows that variations in MAR at fixed halo mass could be detected with a 3 sigma significance, and that an emulator performing full shape fitting on Delta sigma yields better constraints on MAR compared to using only the outer part of the halo.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Bing-Nan Lu, Ning Li, Serdar Elhatisari, Yuan-Zhuo Ma, Dean Lee, Ulf-G Meissner
Summary: We present a new method for computing perturbative corrections in projection QMC calculations and demonstrate it by computing nuclear ground state energies for a realistic chiral interaction. In contrast to the natural ordering, we find remarkably large second-order energy corrections.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Asloob A. Rather, M. Ikram, Ishfaq A. Rather, M. Imran, A. A. Usmani, Bharat Kumar, K. P. Santhosh, S. K. Patra
Summary: In this study, the properties of the Z = 119 isotopic chain within the mass range 284 <= A <= 375 are computed using the relativistic mean field method. The results show that alpha-decay is the dominant decay mode in this mass range, while beta-decay is not possible.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Chemistry, Physical
Xia Cao, Huijing Xiang, Ping Ma, Yang Jie, Yanrong Zhang, Hengyu Guo, Ning Zheng, Zhong Lin Wang
Summary: The advancement of science and technology has led to astonishing developments, such as the invention of an easy and efficient power generator (EEPG) that can drive fluorescent tube lamps and charge mobile phones. With ultrahigh voltage, it can be used for lighting, charging, and collecting wind and tidal energy. It overcomes the limitations of traditional power generation methods that require specific conditions.
Article
Physics, Nuclear
L. A. Malov, G. G. Adamian, N. Antonenko, H. Lenske
Summary: The evolution of superheavy nuclei is explored through investigation of ground-state shell correction energy in the Z = 112-126 and N = 170-190 region. A new approach integrates elements of energy-density functional theory into the microscopic-macroscopic method. The topology of the shell correction distribution reveals the competition of proton and neutron shell closures, indicating the next double magic nucleus.
Article
Physics, Multidisciplinary
Eric Braaten, Hans-Werner Hammer
Summary: The discovery of the X(3872) resonance being extremely close to the D-*0(D) over bar (0) threshold suggests the presence of approximate nonrelativistic conformal symmetry in neutral charm mesons. This study shows that systems consisting of these mesons with low kinetic energies produced in short-distance reactions can be considered as unparticles, created by operators with definite scaling dimensions in a nonrelativistic conformal field theory.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meissner
Summary: The study combined analysis of the electromagnetic form factors of nucleon using dispersion theory, providing consistent description of experimental data. The statistical uncertainties of the extracted form factors are estimated using the bootstrap method, while systematic errors are determined from variations of the spectral functions. The results show good agreement with previous analyses and provide insights into future experimental directions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Astronomy & Astrophysics
P. Capel, D. R. Phillips, H-W Hammer
Summary: In this study, the breakup of Be-11 was calculated using Halo Effective Field Theory and the Dynamical Eikonal Approximation, with the inclusion of an effective Be-10-n-target force. The results show an improved description of neutron-energy and angular spectra on a C-12 target, especially near the Be-11 5/2(+) state. By adjusting the range parameters of the three-body force, a reasonable description of data in the region of the 3/2(+) Be-11 state was also achieved, demonstrating the sensitivity of the overlap integral structure governing Be-11 s-to-d-state transitions induced by the three-body force.
Article
Astronomy & Astrophysics
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G Meissner
Summary: We predict the differential cross sections for e(-)p and e(+)p elastic scattering in the PRad-II energy region. The sensitivity of the cross sections to two-photon exchange effects is investigated, and it is found that the differences between model calculations and phenomenological extractions of two-photon corrections cannot be resolved if the uncertainty in the form factors is taken into account.
Article
Physics, Multidisciplinary
Fabian Brauneis, Timothy G. Backert, Simeon Mistakidis, Mikhail Lemeshko, Hans-Werner Hammer, Artem G. Volosniev
Summary: In this study, we investigate the ground-state properties of weakly repulsive one-dimensional bosons in the presence of an attractive zero-range impurity potential. We find that there are two cases: all bosons are bound to the impurity or all bosons are in a scattering state, and we derive the critical line that separates these cases in the parameter space. The critical line determines the maximum number of bosons that can be bound by the impurity potential in the thermodynamic limit, forming an artificial atom.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Nuclear
Wael Elkamhawy, Hans-Werner Hammer
Summary: We use Halo effective field theory (Halo EFT) to calculate the electromagnetic properties of the deformed one-neutron halo candidate Ne-31. In this framework, Ne-31 is bound by a resonant P-wave interaction between the Ne-30 core and the valence neutron. We adopt a spherical formalism to compute the electromagnetic form factors and the E1-breakup strength distribution of Ne-31 at leading order in Halo EFT, with the associated uncertainties estimated according to our power counting.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2023)
Article
Physics, Nuclear
Wael Elkamhawy, Hans-Werner Hammer, Lucas Platter
Summary: We investigate the weak decay of one-neutron halo nuclei into the proton-core continuum using a cluster effective field theory. We calculate both the direct decay into the continuum and the resonant final state interactions between the proton and the core. We discuss in detail the decay of 11Be and compare our results to experimental data. As another example, we predict the branching ratio for β-delayed proton emission in the case of 19C.
Article
Physics, Multidisciplinary
Lukas Rammelmueller, David Huber, Matija Cufar, Joachim Brand, Hans-Werner Hammer, Artem G. Volosniev
Summary: We present a numerical analysis of spin-2 fermions in a one-dimensional harmonic potential in the presence of a magnetic point-like impurity. Ground-state level crossing between sectors with different fermion parities is observed already for a few particles, which indicates a few-body precursor of a quantum phase transition. This picture is further supported by analyzing density-density correlations in momentum space. Finally, we discuss the experimental realization of this system in existing cold-atoms platforms.
Article
Astronomy & Astrophysics
Eric Braaten, Hans-Werner Hammer
Summary: A nonrelativistic unparticle is an excitation created by an operator with a definite scaling dimension in a nonrelativistic field theory with approximate conformal symmetry. The rate of point production for an unparticle depends on its total energy with a power-law exponent determined by its scaling dimension. Using the exact result for the 3-point function of primary operators in a nonrelativistic conformal field theory, we derive the contribution to the point production rate of an unparticle from its decay into another unparticle recoiling against a particle. In the case of a broken conformal symmetry by a large positive scattering length, the exponent of the energy in the point production rate is deduced for the loosely bound two-particle state recoiling against a particle with large relative momentum.
Article
Physics, Nuclear
Simone Velardita, Hector Alvarez-Pol, Thomas Aumann, Yassid Ayyad, Meytal Duer, Hans-Werner Hammer, Liancheng Ji, Alexandre Obertelli, Yelei Sun
Summary: We propose a two-target measurement method to determine the interaction cross section of hypernuclei with a target nucleus. The method allows us to extract the production cross section of a given hypernucleus and its interaction cross section on a specific target from two independent measurements. The matter radius of the hypernucleus can be deduced from the analysis of the interaction cross section.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meissner
Summary: Using dispersion theory, the Sigma-to-Lambda transition form factors in electromagnetic interactions are calculated considering the pion electromagnetic form factor, SU(3) chiral perturbation theory, the baryon decuplet, and the pi pi- K coupled-channel effect. The electric form factor is significantly affected by the inclusion of the K channel, while the magnetic form factor is minimally affected. The uncertainties in the three-flavor chiral perturbation theory are estimated using a bootstrap sampling method.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Physics, Nuclear
Matthias Gobel, Bijaya Acharya, Hans-Werner Hammer, Daniel R. Phillips
Summary: In this study, we calculate the E1 breakup of the 2n halo nucleus 11Li using halo effective field theory (Halo EFT) and observe a good agreement with experiment. The neutron-neutron (nn) final-state interactions (FSIs) are found to be the most important contribution to the E1 distribution, while the neutron-core (nc) FSIs slightly shift the peak position to lower energies. Additionally, we investigate the sensitivity of the E1 response to the spin structure of the neutron-9Li interaction.
Article
Physics, Particles & Fields
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G. Meissner
Summary: The electromagnetic form factors of the Lambda hyperon in the time-like region are precisely determined through a dispersion-theoretical analysis of world data. Different scenarios are tested and a good description of the data is obtained in the time-like region. The uncertainties in the form factors are estimated and the magnetic radius is predicted when the electric Lambda radius is taken as a constraint. Various vector meson to baryon coupling constants are also extracted.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Nuclear
S. Dietz, H-W Hammer, S. Konig, A. Schwenk
Summary: Resonances in three-body systems are investigated using pionless effective field theory at leading order. Two complementary methods are employed, including analytically continuing the Faddeev equation to the unphysical sheet and exploring the level structure of three-body states in a finite volume approach. The study focuses on both the three-boson system and the three-neutron system, finding trajectory of Borromean three-body Efimov states turning into resonances for the former and no sign of three-body resonances or virtual states at leading order for the latter.
Correction
Physics, Nuclear
P. Capel, D. R. Phillips, H. -W. Hammer
Article
Physics, Nuclear
Mira Varma, Oliver K. Baker
Summary: In this letter, the authors expand upon the previous work to demonstrate the entanglement observed in top quark interactions. They propose that the thermal component caused by proton collisions with top quarks emerges from entanglement within the proton wave function, and they use published results to show the expected behavior.
Article
Physics, Nuclear
E. Ya. Paryev
Summary: In this study, we investigate the near-threshold meson photoproduction from protons and nuclei and explore the possibility of observing non-strange hidden-bottom pentaquark states through differential observables. We calculate the excitation functions and energy/momentum distributions for different production processes and propose that future experiments at high-luminosity electron-ion colliders could provide evidence for the existence of these hidden-bottom pentaquark resonances.
Article
Physics, Nuclear
M. Shariq Asnain, Manoj Kumar Sharma, Mohd. Shuaib, Aquib Siddique, Ishfaq Majeed Bhat, B. P. Singh, R. Prasad
Summary: This study validates the compound nucleus theory using heavy ion beams and different targets. By analyzing cross section data and comparing reaction cross section data, the study confirms the validity of the theory, but also observes discrepancies at lower excitation energies.
Article
Physics, Nuclear
Y. G. Yao, X. Y. Wu, H. Mei
Summary: This study presents a microscopic investigation of the electromagnetic properties of the low-lying states of single-A hypernucleus 9ABe using the HyperGCM method based on covariant density functional theory. The results are compared to those of a particle-rotor model (PRM) and show close agreement. It is found that the electric quadrupole transition strengths are more sensitive to the coupling strengths of the AN interaction than the magnetic moments and M 1 transition strengths.
