Well-developed deformation in 42Si

Abstract

Excited states in 38,40,42Si nuclei have been studied via in-beam gamma-ray spectroscopy with multi-nucleon removal reactions. Intense radioactive beams of 40S and 44S provided at the new facility of the RIKEN Radioactive Isotope Beam Factory enabled gamma-gamma coincidence measurements. A prominent gamma line observed with an energy of 742(8) keV in 42Si confirms the 2+ state reported in an earlier study. Among the gamma lines observed in coincidence with the 2+ -> 0+ transition, the most probable candidate for the transition from the yrast 4+ state was identified, leading to a 4+_1 energy of 2173(14) keV. The energy ratio of 2.93(5) between the 2+_1 and 4+_1 states indicates well-developed deformation in 42Si at N=28 and Z=14. Also for 38,40Si energy ratios with values of 2.09(5) and 2.56(5) were obtained. Together with the ratio for 42Si, the results show a rapid deformation development of Si isotopes from N=24 to N=28.

References in corpus (7)

• Collapse of the N=28 shell closure in ${}^{42}$Si
• A new effective interaction for $0\hslash \omega$ shell model calculations in the sdpf valence space
• Spectroscopy of 32Ne and the Island of Inversion
• Unveiling the intruder deformed 0${}_2^{+}$ state in ${}^{34}$Si
• Energy Density Functional analysis of shape evolution in N=28 isotones
• Shell structure at N=28 near the dripline: spectroscopy of ${}^{42}$Si, ${}^{43}$P and ${}^{44}$S
• Measurement of excited states in 40Si and evidence for weakening of the N=28 shell gap

Cited by in corpus (34)

• The merging of the islands of inversion at N=20 and N=28
• DALI2: A NaI(Tl) detector array for measurements of $\gamma$ rays from fast nuclei
• Exotic neutron-rich medium-mass nuclei with realistic nuclear forces
• Antisymmetrized molecular dynamics studies for exotic clustering phenomena in neutron-rich nuclei
• State-of-the-art of beyond mean field theories with nuclear density functionals
• Shell evolution of $N=40$ isotones towards ${}^{60}$Ca: First spectroscopy of ${}^{62}$Ti
• Mass Measurements Demonstrate a Strong N =28 Shell Gap in Argon
• Is the structure of 42Si understood?
• Shell evolution and its indication on the isospin dependence of the spin-orbit splitting
• Structure of 55Sc and development of the N=34 subshell closure
• Collectivity evolution in the neutron-rich Pd isotopes towards the N=82 shell closure
• Triaxial deformation and the loss of the N = 28 shell gap
• Probing Surface Quantum Flows in Deformed Pygmy Dipole Modes
• Properties of exotic nuclei and their linkage to the nucleonic interaction
• Spectroscopy of 46Ar by the (t,p) two-neutron transfer reaction
• Examining the $N$ = 28 shell closure through high-precision mass measurements of ${}^{46-48}$Ar
• Shell-structure of one-particle resonances in deformed potentials
• Constraints on the neutron drip-line with the newly observed 39Na
• Large enhancement of total reaction cross sections at the edge of the island of inversion in Ti, Cr, and Fe isotopes
• Two-proton removal from ${}^{44}$S and the structure of ${}^{42}$Si
• Shell-model study of titanium isotopic chain with chiral two- and three-body forces
• Shell structure of ${}^{43}$S and collapse of the $N=28$ shell closure
• Evolution of single-particle structure of silicon isotopes
• Behaviour of pf shell under RMF+BCS Description
• Oblate deformation of light neutron-rich even-even nuclei
• Simultaneous analysis of matter radii, transition probabilities, and excitation energies of Mg isotopes by angular-momentum-projected configuration-mixing calculations
• Low-lying 2${}^{+}$ states generated by $pn$-quadrupole correlation and $N=28$ shell quenching
• Prediction of two-neutron halos in the $N=28$ isotones ${}^{40}$Mg and ${}^{39}$Na
• Interplay between one-particle and collective degrees of freedom in nuclei
• Ground State Properties of Neutron Magic Nuclei
• Global performance of multireference density functional theory for low-lying states in $sd$-shell nuclei
• Triaxial-shape dynamics in the low-lying excited $0^{+}$ state: Role of the collective mass
• Evolution of $N=28$ shell closure in relativistic continuum Hartree-Bogoliubov theory
• Determination of proton and neutron contributions to the $0_{g.s.}^{+}\to 2_1^{+}$ excitations in ${}^{42}$Si and ${}^{44}$S using inelastic proton scattering in inverse kinematics and intermediate energy Coulomb excitation