369 citations · 1.8k across the 39 of their papers we have counts for
40 papers
AI-Assisted GPU optimization of the Stochastic Variational Method for Few-Body Boson System
Noritaka Shimizu, Shigeyoshi Aoyama, Yusuke Tsunoda +1
The stochastic variational method (SVM) is one of the most powerful methods to solve quantum few-body systems precisely in various fields, such as nuclear and atomic physics. To th…
Electromagnetic transition strength in Ca: the lifetime of the state
S. Chen, M. Petri, S. Paschalis +36
High-resolution in-beam -ray spectroscopy of Ca was performed at the Radioactive Isotope Beam Factory (RIBF) at RIKEN. Excited states in Ca were populated via one-…
How long can a non-spherical quantum object remain standing ? - a fundamental quantum question -
Takaharu Otsuka, Yusuke Tsunoda
An isolated quantum system generally exhibits rotational symmetry, i.e., conserved spin (angular momentum) in its eigenstates. Non-spherical quantum objects such as many of molecul…
Probing the shape evolution and shell structures in neutron-rich N=50 nuclei
Anil Kumar, Noritaka Shimizu, Takayuki Miyagi +2
The structure of low-lying states of nuclei is investigated by the advanced Monte Carlo shell model (MCSM) in the - model space. We have employed the shel…
Lifetime of the state of Te
H. Mayr, T. Stetz, V. Werner +22
The evolution of the collectivity of tellurium isotopes from mid-shell towards is currently based mainly on properties of the first excited states. To extend structura…
Nuclear Physics Confronts Relativistic Collisions Of Isobars
Giuliano Giacalone, Jiangyong Jia, Vittorio Somà +43
High-energy collisions involving the isobars Zr and Ru have been performed in 2018 at Brookhaven National Laboratory's Relativistic Heavy Ion Collider (RHIC) a…
Vibrational Modes in Strongly Deformed Nuclei
Y. Tsunoda, T. Otsuka, N. Shimizu +3
Low-energy vibrational excitations associated with the fluctuation of quadrupole deformed shapes are discussed within the frame of state-of-the-art Configuration Interaction calcul…
Charge Radii Measurements of Exotic Tin Isotopes in the Proximity of and
F. P. Gustafsson, L. V. Rodríguez, R. F. Garcia Ruiz +51
We report nuclear charge radii for the isotopes Sn, measured using two different collinear laser spectroscopy techniques at ISOLDE-CERN. These measurements clarify the…
Isolated one-phonon mixed-symmetry 2+ state of the radioactive neutron-rich nuclide 132Te
T. Stetz, H. Mayr, V. Werner +20
The transition strengths between excited states of the neutron-rich, radioactive nuclide Te have been studied through direct lifetime measurements using the Dopp…
Level Structures of Ca Cast Doubt on a doubly magic Ca
S. Chen, F. Browne, P. Doornenbal +80
Gamma decays were observed in Ca and Ca following quasi-free one-proton knockout reactions from Sc beams at MeV/nucleon. For Ca, a …
Shape transition of Nd and Sm isotopes and neutrinoless double-beta decay nuclear matrix element of Nd
Yusuke Tsunoda, Noritaka Shimizu, Takaharu Otsuka
Neutron-rich Nd and Sm isotopes are known to exhibit shape phase transition as a function of neutron number. Among them, Nd and Sm are important not only because th…
Prevailing Triaxial Shapes in Atomic Nuclei and a Quantum Theory of Rotation of Composite Objects
T. Otsuka, Y. Tsunoda, N. Shimizu +3
In the traditional view, heavy deformed nuclei are like axially-symmetric prolate ellipsoids, rotating about one of the short axes. In the present picture, their shapes may be tria…
A new study of the and shell gap for Ti and V by the first high-precision MRTOF mass measurements at BigRIPS-SLOWRI
S. Iimura, M. Rosenbusch, A. Takamine +34
The atomic masses of Sc, Ti, and V have been determined using the high-precision multi-reflection time-of-flight technique. The radioisotopes have been p…
quadratures in angular-momentum projection
Noritaka Shimizu, Yusuke Tsunoda
While the angular-momentum projection is a common tool for theoretical nuclear structure studies, a large amount of computations are required particularly for triaxially deformed s…
Moments and Radii of exotic Na and Mg isotopes
Takaharu Otsuka, Noritaka Shimizu, Yusuke Tsunoda
The ground-state properties of neutron-rich exotic Na and Mg isotopes with even numbers of neutrons, N, are studied up to driplines. The shell-model calculations with an ab initio…
Variational approach with the superposition of the symmetry-restored quasi-particle vacua for nuclear shell-model calculations
Noritaka Shimizu, Yusuke Tsunoda, Yutaka Utsuno +1
We propose a variational calculation scheme utilizing the superposition of the angular-momentum, parity, number projected quasiparticle vacua, that is especially suitable for apply…
Detailed low-spin spectroscopy of 65Ni via neutron capture reaction
C. Porzio, C. Michelagnoli, N. Cieplicka-Orynczak +17
An extended investigation of the low-spin structure of the Ni nucleus was performed at the Institut Laue-Langevin, Grenoble, via the neutron capture reaction Ni(n,…
Triaxial rigidity of Er and its Bohr-model realization
Yusuke Tsunoda, Takaharu Otsuka
The triaxial nature of low-lying rotational bands of Er is presented from the viewpoint of the Bohr Hamiltonian and from that of many-fermion calculations by the Monte Carl…
Shape Coexistence at Zero Spin in 64Ni Driven by the Monopole Tensor Interaction
N. Mărginean, D. Little, Y. Tsunoda +75
The low-spin structure of the semimagic 64Ni nucleus has been considerably expanded: combining four experiments, several 0+ and 2+ excited states were identified below 4.5 MeV, and…
Electromagnetic character of the competitive -decay from Ba
P. -A. Söderström, L. Capponi, E. Açıksöz +12
Second-order processes in physics is a research topic focusing attention from several fields worldwide including, for example, non-linear quantum electrodynamics with high-power la…
Ni revealed as a doubly magic stronghold against nuclear deformation
R. Taniuchi, C. Santamaria, P. Doornenbal +68
Nuclear magic numbers, which emerge from the strong nuclear force based on quantum chromodynamics, correspond to fully occupied energy shells of protons, or neutrons inside atomic…
Underlying structure of collective bands and self-organization in quantum systems
Takaharu Otsuka, Yusuke Tsunoda, Takashi Abe +2
The underlying structure of low-lying collective bands of atomic nuclei is discussed from a novel perspective on the interplay between single-particle and collective degrees of fre…
Two-particle transfer processes as a signature of shape phase transition in Zirconium isotopes
J. A. Lay, A. Vitturi, L. Fortunato +3
We explore two-particle transfer reactions as a unique probe of the occurence of shape coexistence in shape phase transitions. The (t,p) reactions to the ground state and to excite…
Shape staggering of mid-shell mercury isotopes from in-source laser spectroscopy compared with Density Functional Theory and Monte Carlo Shell Model calculations
S. Sels, T. Day Goodacre, B. A. Marsh +45
Neutron-deficient Hg isotopes were studied using in-source laser resonance-ionization spectroscopy at the CERN-ISOLDE radioactive ion-beam facility, in an experiment co…