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nucl-th2026

Proton-to-Alpha branching ratio in the C+C fusion reaction at astrophysical energies

Ruojun Yang, Ruiqi Chen, Xiao Fang +4

The unique resonance features in the C+C fusion reaction lead to significant fluctuations in the branching ratio , making it difficult to determine t…

nucl-th2026

One-Body and Two-Body Density Matrix Elements in a Symplectic Many-Body Basis

Jakub Herko, Mark A. Caprio

The symplectic no-core configuration interaction (SpNCCI) framework is an ab initio many-body method for nuclear structure which makes use of the approximate symplectic symmetry of…

nucl-th2025★ 1 cited

Halo structure of He from two-nucleon spatial correlations

Mengyao Huang, Tobias Frederico, Peng Yin +3

We evaluate pairwise correlations using ground state wave functions for He and He obtained by no-core shell model calculations with the Daejeon16 nucle…

nucl-th2025★ 2 cited

Robust ab initio predictions for dimensionless ratios of E2 and radius observables. II. Estimation of E2 transition strengths by calibration to the charge radius

Mark A. Caprio, Patrick J. Fasano, Pieter Maris

Converged results for E2 observables are notoriously challenging to obtain in ab initio no-core configuration interaction (NCCI) approaches. Matrix elements of the E2 operator are…

nucl-th2024★ 4 cited

Improving the predictive power of empirical shell-model Hamiltonians

J. A. Purcell, B. A. Brown, B. C. He +2

We present two developments which enhance the predictive power of empirical shell-model Hamiltonians for cases in which calibration data are sparse. A recent improvement in the ab…

nucl-th2024★ 25 cited

Improved structure of calcium isotopes from ab initio calculations

M. Heinz, T. Miyagi, S. R. Stroberg +3

The in-medium similarity renormalization group (IMSRG) is a powerful and flexible many-body method to compute the structure of nuclei starting from nuclear forces. Recent developme…

nucl-th2024★ 2 cited

Robust ab initio predictions for dimensionless ratios of E2 and radius observables. I. Electric quadrupole moments and deformation

Mark A. Caprio, Pieter Maris, Patrick J. Fasano

Converged results for E2 observables are notoriously challenging to obtain in ab initio no-core configuration interaction (NCCI) approaches. Matrix elements of the E2 operator are…

nucl-th2024★ 18 cited

IMSRG with flowing 3 body operators, and approximations thereof

S. R. Stroberg, T. D. Morris, B. C. He

We explore the impact of retaining three-body operators within the in-medium similarity renormalization group (IMSRG), as well as various approximations schemes. After studying two…

nucl-th2024★ 20 cited

Factorized Approximation to the IMSRG(3)

B. C. He, S. R. Stroberg

We describe an approximation to the in-medium similarity renormalization group (IMSRG) method in which we include the effects of intermediate three-body operators arising within ne…

nucl-th2024★ 2 cited

Direct ab initio calculation of the He nuclear electric dipole polarizability

Peng Yin, Andrey M. Shirokov, Pieter Maris +5

The calculation of nuclear electromagnetic sum rules by directly diagonalizing the nuclear Hamiltonian in a large basis is numerically challenging and has not been performed for $A…

nucl-th2023★ 50 cited

Ab initio uncertainty quantification of neutrinoless double-beta decay in Ge

A. Belley, J. M. Yao, B. Bally +9

The observation of neutrinoless double-beta () decay would offer proof of lepton number violation, demonstrating that neutrinos are Majorana particles, while also helping us…

nucl-th2023★ 7 cited

Magnetic moments of nuclei with chiral effective field theory operators

Soham Pal, Shiplu Sarker, Patrick J. Fasano +4

Chiral effective field theory (EFT) provides a framework for obtaining internucleon interactions in a systematically improvable fashion from first principles, while also providi…

nucl-th2022★ 13 cited

Comparative analysis of formalisms and performances of three different beyond mean-field approaches

František Knapp, Panagiota Papakonstantinou, Petr Veselý +3

We investigate the differences and analogies between the equation of motion phonon method (EMPM) and second Tamm-Dancoff and random-phase approximations (STDA and SRPA) paying spec…

nucl-th2022★ 15 cited

Microscopic aspects of -softness in atomic nuclei

Nazira Nazir, S. Jehangir, S. P. Rouoof +4

The microscopic origin of the -softness (fluctuations in the triaxiality parameter of the nuclear shape) observed in atomic nuclei is studied in the framework of the triaxia…

nucl-th2022★ 10 cited

Triaxiality explored by an odd quasi-particle

Weichuan Li, Mark A. Caprio, Stefan Frauendorf

The triaxiality of odd-mass nuclei is investigated by coupling a quasiparticle to an even-even core through the core-quasiparticle coupling model. Both soft and rigid triaxial core…

nucl-th2022★ 21 cited

Robust ab initio prediction of nuclear electric quadrupole observables by scaling to the charge radius

Mark A. Caprio, Patrick J. Fasano, Pieter Maris

Meaningful predictions for electric quadrupole (E2) observables from ab initio nuclear theory are necessary, if the ab initio description of collective correlations is to be confro…

nucl-th2022★ 10 cited

Ab initio estimation of strengths in Li and its neighbors by normalization to the measured quadrupole moment

Mark A. Caprio, Patrick J. Fasano

For electric quadrupole () observables, which depend on the large-distance tails of the nuclear wave function, ab initio no-core configuration interaction (NCCI) calculations c…

nucl-th2022★ 20 cited

Comprehensive Analyses of the Neutrino-Process in the Core-collapsing Supernova

Heamin Ko, Dukjae Jang, Myung-Ki Cheoun +8

We investigate the neutrino flavor change effects due to neutrino self-interaction, shock wave propagation as well as matter effect on the neutrino-process of the core-collapsing s…

nucl-th2021★ 6 cited

Symmetry and shape coexistence in 10Be

M. A. Caprio, A. E. McCoy, P. J. Fasano +1

Within the low-lying spectrum of 10Be, multiple rotational bands are found, with strikingly different moments of inertia. A proposed interpretation has been that these bands variou…

nucl-th2021★ 44 cited

Performing Bayesian analyses with AZURE2 using BRICK: an application to the Be system

Daniel Odell, Carl R. Brune, Daniel R. Phillips +2

Phenomenological -matrix has been a standard framework for the evaluation of resolved resonance cross section data in nuclear physics for many years. It is a powerful method for…

nucl-th2021★ 18 cited

Natural orbitals for the ab initio no-core configuration interaction approach

Patrick J. Fasano, Chrysovalantis Constantinou, Mark A. Caprio +2

Ab initio no-core configuration interaction (NCCI) calculations for the nuclear many-body problem have traditionally relied upon an antisymmetrized product (Slater determinant) bas…

nucl-th2021★ 12 cited

Evolution of low-lying M1 modes in germanium isotopes

S. Frauendorf, R. Schwengner

Magnetic dipole strength functions are determined for the series of germanium isotopes from to = 48 on the basis of a large number of transition strengths calculat…

nucl-th2021★ 19 cited

Quadrupole moments and proton-neutron structure in p-shell mirror nuclei

M. A. Caprio, P. J. Fasano, P. Maris +1

Electric quadrupole (E2) matrix elements provide a measure of nuclear deformation and related collective structure. Ground-state quadrupole moments in particular are known to high…

nucl-th2021★ 11 cited

A Relativistic Quantum Approach to Neutrino and Antineutrino Emissions via the Direct Urca Process in Strongly Magnetized Neutron-Star Matter

Tomoyuki Maruyama, A. Baha Balantekind, Myung-Ki Cheoung +3

We study neutrino and antineutrino emission from the direct Urca process in neutron-star matter in the presence of strong magnetic fields. We calculate the neutrino emissivity of t…