Y. Utsuno
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View article: Vibrational Modes in Strongly Deformed Nuclei
Vibrational Modes in Strongly Deformed Nuclei Open
Low-energy vibrational excitations associated with the fluctuation of quadrupole deformed shapes are discussed within the frame of state-of-the-art Configuration Interaction calculations, actually performed via the Quasi-particle Vacua She…
View article: Conclusive evidence of magnetic rotational band in 57Fe: Extending the shears mechanism to the fp shell orbital
Conclusive evidence of magnetic rotational band in 57Fe: Extending the shears mechanism to the fp shell orbital Open
A Magnetic Rotational (MR) band in 57Fe nucleus has been newly identified and established from the decreasing behaviour of the experimental electric dipole transition probabilities, B(M1), determined from the measured lifetimes of the stat…
View article: Prevailing triaxial shapes in atomic nuclei and a quantum theory of rotation of composite objects
Prevailing triaxial shapes in atomic nuclei and a quantum theory of rotation of composite objects Open
Virtually any object can rotate: the rotation of a rod or a linear molecule appears evident, but a number of objects, including a simple example of H $$_2$$ O molecule, are of complex shapes and their rotation is of great interest. For …
View article: Excited States in the Neutron Rich Nuclei \(^{46}\)S and \(^{47}\)S
Excited States in the Neutron Rich Nuclei \(^{46}\)S and \(^{47}\)S Open
Data on the structure of sulphur isotopes close to the neutron drip-line are rather scarce. The excited states of the very neutron-rich \(^{46}\)S and \(^{47}\)S nuclei have been investigated by in-beam gamma-ray spectroscopy at the Radioa…
View article: In-beam $γ$-ray spectroscopy towards the proton dripline: The curious case of $^{32}$Ar
In-beam $γ$-ray spectroscopy towards the proton dripline: The curious case of $^{32}$Ar Open
High-resolution in-beam $γ$-ray spectroscopy was used to study excited states of the neutron-deficient nucleus $^{32}$Ar populated in fast-beam induced four- and six-nucleon removal reactions from $^{36,38}$Ca. One new $γ$-ray transition a…
View article: Gamma-ray spectroscopy of <sup>55</sup>Sc
Gamma-ray spectroscopy of <sup>55</sup>Sc Open
The N = 34 isotope 55 Sc has been investigated using in-beam γ -ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory. Spectra from the direct ( p , pn ) reaction as well as indirect reaction channels have been investigated. γ ray…
View article: Low spin spectroscopy of neutron-rich 43,44,45Cl via β and (β}n decay
Low spin spectroscopy of neutron-rich 43,44,45Cl via β and (β}n decay Open
β decay of neutron-rich isotopes 43,45 S,studied at the National Superconducting Cyclotron Laboratory is reported here. β delayed γ transitions were detected by an array of 16 clover detectors surrounding the Beta Counting Station which co…
View article: Understanding Excitations in $^{59,61}$Co, $^{59}$Ni
Understanding Excitations in $^{59,61}$Co, $^{59}$Ni Open
High spin states in $^{59}$Co ($Z=27$), $^{59}$Ni ($Z=28$) and $^{61}$Co have been populated by the fusion evaporation reactions, $^{48}$Ti($^{14}$C, p2n)$^{59}$Co, $^{48}$Ti($^{14}$C, 3n)$^{59}$Ni, and $^{50}$Ti($^{14}$C, p2n)$^{61}$Co. T…
View article: Evaluations of uncertainties in simulations of propagation of ultrahigh-energy cosmic-ray nuclei derived from microscopic nuclear models
Evaluations of uncertainties in simulations of propagation of ultrahigh-energy cosmic-ray nuclei derived from microscopic nuclear models Open
Photodisintegration is a main energy loss process for ultrahigh-energy cosmic-ray (UHECR) nuclei in intergalactic space. Therefore, it is crucial to understand systematic uncertainty in photodisintegration when simulating the propagation o…
View article: Prevailing Triaxial Shapes in Atomic Nuclei and a Quantum Theory of Rotation of Composite Objects
Prevailing Triaxial Shapes in Atomic Nuclei and a Quantum Theory of Rotation of Composite Objects Open
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 triaxial. The triaxial shape yields complex rotations, which ac…
View article: Coexistence of single particle and collective excitation in $^{61}$Ni
Coexistence of single particle and collective excitation in $^{61}$Ni Open
The high spin states in 61 Ni have been studied using the fusion evaporation reaction, Ti( $^{14}$C,3n) $^{61}$Ni at an incident beam energy of 40 MeV. A Compton suppressed multi-HPGe detector setup, consisting of six Clover detectors and …
View article: Identification of deformed intruder states in semi-magic Ni 70
Identification of deformed intruder states in semi-magic Ni 70 Open
The structure of semi-magic 2870Ni42 was investigated following complementary multinucleon-transfer and secondary fragmentation reactions. Changes to the higher-spin, presumed negative-parity states based on observed γ-ray coincidence rela…
View article: Cross-shell excitations near the "island of inversion": Structure of Mg30
Cross-shell excitations near the "island of inversion": Structure of Mg30 Open
Excited states in Mg30 have been populated to ~6 and 5 MeV excitation energy with the C14(O18,2p) reaction. Firm spin assignments for states with J2 have been made in this nucleus. The level scheme is compared to shell-model calculations u…
View article: PANDORA project: photo-nuclear reactions below $A=60$
PANDORA project: photo-nuclear reactions below $A=60$ Open
Photo-nuclear reactions of light nuclei below a mass of $A=60$ are studied experimentally and theoretically by the PANDORA (Photo-Absorption of Nuclei and Decay Observation for Reactions in Astrophysics) project. Two experimental methods, …
View article: Coexisting normal and intruder configurations in <sup>32</sup>Mg
Coexisting normal and intruder configurations in <sup>32</sup>Mg Open
Situated in the so-called “island of inversion,” the nucleus 32Mg is considered as an archetypal example of the disappearance of magicity at N = 20. We report on high statistics in-beam spectroscopy of 32Mg with a unique approach, in that …
View article: Probing Different Characteristics of Shell Evolution Driven by Central, Spin-Orbit, and Tensor Forces
Probing Different Characteristics of Shell Evolution Driven by Central, Spin-Orbit, and Tensor Forces Open
In this paper, the validity of the shell-evolution picture is investigated on the basis of shell-model calculations for the atomic mass number 25≲A≲55 neutron-rich nuclei. For this purpose, the so-called SDPF-MU interaction is used. Its ce…
View article: <i>β</i>-decay half-lives of neutron-rich N=82,81 isotones by shell-model calculations
<i>β</i>-decay half-lives of neutron-rich N=82,81 isotones by shell-model calculations Open
We perform large-scale shell-model calculations and successfully describe the low-lying spectra and half-lives of neutron-rich N = 82 and N = 81 isotones with Z = 42 − 49 in a unified way. Shell-model study shows that their Gamow-Teller st…
View article: Neutron capture cross sections of light neutron-rich nuclei relevant for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>r</mml:mi></mml:math>-process nucleosynthesis
Neutron capture cross sections of light neutron-rich nuclei relevant for -process nucleosynthesis Open
The measurements of neutron capture cross sections of neutron-rich nuclei are challenging but essential for understanding nucleosynthesis and stellar evolution processes in the explosive burning scenario. In the quest of -process abundance…
View article: The impact of photonuclear reaction models on propagation of ultrahigh energy cosmic rays
The impact of photonuclear reaction models on propagation of ultrahigh energy cosmic rays Open
Ultrahigh energy cosmic ray (UHECR) nuclei with Lorentz factors greater than about $10^9$ lose their energies by the photodisintegration with cosmic microwave background photons in intergalactic space. The photodisintegration is a main pro…
View article: Ground-state properties of light $4n$ self-conjugate nuclei in $ab$ $initio$ no-core Monte Carlo shell model with nonlocal $NN$ interactions
Ground-state properties of light $4n$ self-conjugate nuclei in $ab$ $initio$ no-core Monte Carlo shell model with nonlocal $NN$ interactions Open
We report $J^\pi = 0^+$ ground-state energies and point-proton radii of $^4$He, $^8$Be, $^{12}$C, $^{16}$O and $^{20}$Ne nuclei calculated by the {\it ab initio} no-core Monte Carlo shell model with the JISP16 and Daejeon16 nonlocal $NN$ i…