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Showing papers by "Hyun-Chul Kim published in 1981"


Journal ArticleDOI
TL;DR: In this article, the deformation and shape coexistence in this region were described in terms of the protons driving deformation, and the origin of this deformation was described by using a protons driven deformation model.
Abstract: The levels in $^{74,76}\mathrm{Kr}$ were studied with in-beam $\ensuremath{\gamma}$-spectroscopy techniques and the ${\ensuremath{\beta}}^{+}$ decay of $^{76}\mathrm{Rb}$. The energies of the ${2}_{1}^{+}$ states in $^{74,76}\mathrm{Kr}$ deviate from smooth behavior compared with the higher spin levels. The yrast cascade $B(E2)$'s are highly collective. The $^{74,76}\mathrm{Kr}$ ground states have unusually large deformation. The origin of this deformation and of shape coexistence in this region is described in terms of the protons driving the deformation.

110 citations


Journal ArticleDOI
TL;DR: In this paper, low and high-spin states of /sup 68/Ge are investigated through in-beam gamma-ray spectroscopy via the /sup 58/Ni(/sup 12/C,2p), /sup 63/Cu(/Sup 7/Li,2n), and /sup 52/Cr(/SUP 19/F,p2n) reactions.
Abstract: Low- and high-spin states of /sup 68/Ge are investigated through in-beam ..gamma..-ray spectroscopy via the /sup 58/Ni(/sup 12/C,2p), /sup 63/Cu(/sup 7/Li,2n), and /sup 52/Cr(/sup 19/F,p2n) reactions. A surprising richness of collective bands is observed in /sup 68/Ge including three even parity bands built on 8/sup +/ levels, the lower two of which are assigned as rotational aligned bands built on both proton and neutron (g/sub 9/2/)/sup 2/ configurations, and three odd parity bands built on ..pi.. and ..nu.. configurations that include the g/sub 9/2/ orbit. Details of the multiple bands and other levels observed in /sup 68/Ge are presented. Rotation-aligned model calculations and interacting boson model calculations for /sup 68/Ge are also described.

25 citations



Journal ArticleDOI
TL;DR: In this paper, the authors investigated the levels of $€ 80€ kr$ using in-beam $\ensuremath{\gamma}$-spectroscopy techniques via the $€ 70 € kr{Zn}(€ 12€ C,€ 2n)€ 0.4 MeV ion reaction with 38.0€ 1.4
Abstract: The levels of $^{80}\mathrm{Kr}$ have been investigated using in-beam $\ensuremath{\gamma}$-spectroscopy techniques via the $^{70}\mathrm{Zn}(^{12}\mathrm{C},2n)^{80}\mathrm{Kr}$ reaction with 38.4 MeV $^{12}\mathrm{C}$ ions. The energies, relative intensities, and angular distributions of the $\ensuremath{\gamma}$ rays were measured. The proposed level scheme shows four bands: three of even parity and one of odd parity. Two-quasiparticle-plus-rotor calculations for $^{80}\mathrm{Kr}$ suggest that the even-parity band built on the (${8}^{+}$) state at 3701.6 keV has primarily a proton ${({g}_{\frac{9}{2}})}^{2}$ configuration and the odd-parity band built on the ${5}^{\ensuremath{-}}$ state at 2861.0 keV has an essentially pure two-quasiproton $({f}_{\frac{5}{2}},{g}_{\frac{9}{2}}){5}^{\ensuremath{-}}$ configuration. The observed backbending in the yrast band is attributed to the crossing of the ground band and the excited positive-parity band.NUCLEAR REACTIONS $^{70}\mathrm{Zn}(^{12}\mathrm{C},2n)$, $E=33.0\ensuremath{-}38.4$ MeV; measured ${E}_{\ensuremath{\gamma}}$, ${I}_{\ensuremath{\gamma}}$, $\ensuremath{\gamma}(\ensuremath{\theta})$ DCO; deduced $^{80}\mathrm{Kr}$ levels, $J$, $\ensuremath{\pi}$, and $\ensuremath{\gamma}$ branching; performed two-quasiparticle-plus-rotor model calculations.

7 citations