Search

The band structures of the doubly-odd nucleus 116 I have been studied by using in-beam γ -ray spectroscopy with the 103 Rh( 16 O, 3n) 116 I reaction at an energy of E lab =80 MeV. The beam was provided by the 12UD tandem accelerator at the University of Tsukuba. Absolute excitation energies for the observed collective bands except for a band based on the π (h 11/2 ) ν (g 7/2 ) configuration have been definitely determined. The positive-parity rotational band based on the π (h 11/2 ) ν (h 11/2 ) configuration is built on the 8 + level at 874.3 keV and exhibits a spin inversion below I =14ℏ. A new vibration-like band built on the 8 − level at 468.5 keV has been identified and can be interpreted as resulting from the π (g 7/2 ) ν (h 11/2 ) configuration coupled to the Te core vibration. A negative-parity band built on the 14 − level at 2547.6 keV shows a vibration-like structure and terminates its collectivity at the 24 − level at 6215.0 keV. The total Routhian surface calculations suggest a noncollective oblate state with β 2 =0.182 and γ =60° based on a fully aligned six-quasiparticle, π [h 11/2 (g 7/2 ) 2 ] ν [g 7/2 (h 11/2 ) 2 ], configuration for this 24 − level. The excitation energy of the 7 − isomer with T 1/2 =3.27 μs was found to be at 430.4 keV.

The excited states of the doubly-odd nucleus 118 I were investigated by using in-beam gamma-ray spectroscopy with the 103 Rh ( 18 O, 3n) 118 I reaction at an energy of 85 MeV. The beam was provided by the 12UD tandem accelerator at the University of Tsukuba. Several collective bands were identified and their excitation energies were definitely established. The positive-parity collective bands based on the π h 11/2 ν h 11/2 configuration and the negative-parity bands based on the π h 11/2 ν g 7/2 configuration were newly assigned. An inversion between the favored and unfavored states in the π h 11/2 ν h 11/2 band was observed below I=17.5ℏ. The excitation energy of the 7 − isomer with T 1/2 =8.5 m was found to be at 188.8 keV.

High-spin states in the odd-odd 168Lu nucleus, populated in the 154Sm(19F,5n) reaction at a beam energy of 96 MeV, were investigated using in-beam γ-ray spectroscopy techniques. The BC neutron crossing in the yrast band, based on πg7/2[404]7/2+⊗νi13/2[642]5/2+ configuration, occurs at ħω= 0.31 MeV. The two side bands, based on πh11/2[514]9/2−⊗νi13/2[642]5/2+ and πh9/2[541]1/2−⊗νi13/2[642]5/2+ configurations, show anomalous signature-splitting and signature-inversion in the first one, to occur at ħω= 0.24 MeV. A moderately delayed BC-crossing is anticipated in the second one.

Excited states of the 119Xe nucleus have been studied by using in-beam γ-ray spectroscopy with the 107Ag ( 16O, p3n) 119Xe fusion-evaporation reaction at a beam energy of 85 MeV. The level scheme of 119Xe has been derived from γ-γ coincidence and γ-γ angular correlation analyses. We have, for the first time, established the second negative-parity favored and unfavored states built on the 11/2- state, namely the yrare rotational bands in 119Xe. In contrast to the behavior of the yrast bands where the favored states are lying lower in energy, the yrare favored states were observed to lie above the unfavored band. Such a signature inversion in 119Xe is changed to be normal at I = 12?.

We present information on the excited states in the prolate-deformed, neutron-rich nuclei 165;167Tb100;102. The nuclei of interest were synthesised following in-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm 9Be target at the Radioactive Ion-Beam Factory (RIBF), RIKEN, Japan. The exotic nuclei were separated and identified event-by-event using the BigRIPS separator, with discrete energy gamma-ray decays from isomeric states with half-lives in the s regime measured using the EURICA gamma-ray spectrometer. Metastable-state decays are identified in 165Tb and 167Tb and interpreted as arising from hindered E1 decay from the 7 2 [523] single quasi-proton Nilsson configuration to rotational states built on the 3 2 [411] single quasi-proton ground state. These data correspond to the first spectroscopic information in the heaviest, odd-A terbium isotopes reported to date and provide information on proton Nilsson configurations which reside close to the Fermi surface as the 170Dy doubly-midshell nucleus is approached.

Background: The properties of resonances in $^{26}\mathrm{Si}$ are important to better constrain the $^{25}\mathrm{Al}(p,\ensuremath{\gamma})^{26}\mathrm{Si}$ reaction rate relevant to the synthesis of galactic $^{26}\mathrm{Al}{}^{\mathrm{gs}}$ and energy generation in explosive stellar environment at higher temperature.Purpose: $^{25}\mathrm{Al}+p$ elastic scattering was measured to further constrain and investigate disagreements in resonance parameters for the high-lying excited states of $^{26}\mathrm{Si}$ with high statistics and without background contamination within the target.Methods: The experiment was performed by bombarding a thick ${\mathrm{H}}_{2}$ target with an $^{25}\mathrm{Al}$ radioactive ion beam. The resonances at excitation energies of 6.6--8.3 MeV in the $^{26}\mathrm{Si}$ compound nucleus were studied at the low-energy radioactive-ion beam facility CRIB (Center for Nuclear Study Radioactive Ion Beam separator) at the University of Tokyo.Results: Six resonant states were observed and their resonance parameters were extracted by an $R$-matrix analysis. Our resonance parameters for two levels are in good agreement with the results of previous studies, while for four others, excitation energy, proton partial width, and spin-parity assignment disagree with the results of recent study via elastic scattering of $^{25}\mathrm{Al}+p$.Conclusion: The parameters of resonant states in $^{26}\mathrm{Si}$ determined in the present work for the $^{25}\mathrm{Al}(p,\ensuremath{\gamma})^{26}\mathrm{Si}$ reaction rate are consistent with that of the previous result, solving spin-parity assignment discrepancies between experiments, relevant at higher temperatures.

One of the most prominent success with the Big Bang models is the precise reproduction of mass abundance ratio for 4He. In spite of the success, abundances of lithium isotopes are still inconsistent between observations and their calculated results, which is known as lithium abundance problem. Since the calculations were based on the experimental reaction data together with theoretical estimations, more precise experimental measurements may improve the knowledge of the Big Bang nucleosynthesis. As one of the destruction process of lithium-7, we have performed measurements for the reaction cross sections of the 7L(3He,p)9Be reaction.

Excited states of the 120 Cs nucleus have been studied by using in-beam γ -ray spectroscopy with the 107 Ag( 16 O, 3n) 120 Cs fusion–evaporation reaction at a beam energy of 85 MeV. The level scheme of 120 Cs has been determined using γ – γ coincidence and γ – γ angular correlation analyses. We suggest that the spin of the lowest state for the πh 11/2 ⊗ νh 11/2 quasiparticle band should be 9 + , which is 2ℏ higher in angular momentum than that of previous spin assignment. A spin inversion between the favored and the unfavored states in this positive-parity band was observed below I =19ℏ. In addition, the spin assignment of the negative-parity band with small signature splitting has also been made for the band head with I π =8 − . These two rotational bands are found to be connected to each other at lower spin states and to the high-spin 7 − isomer with half-life of T 1/2 =61.2 s through different decay paths.

Excited states of the 122 Cs nucleus have been studied by in-beam γ -ray spectroscopy with the 109 Ag( 16 O ,3 n) 122 Cs fusion-evaporation reaction at a beam energy of 80 MeV. γ – γ coincidence and γ – γ angular correlation analyses were employed for determining the level scheme of 122 Cs. We have determined the spin of the πh 11/2 ⊗νh 11/2 quasiparticle band with spin inversion structure and the negative-parity band with strongly coupled structure. These two rotational bands are found to be built on the same high-spin isomeric 8 − state at 500 keV. In addition, three rotational bands have been newly identified in the present work.

High-spin states of 155Gd were populated by using the 154Sm(α,3nγ)155Gd reaction at E α= 33 MeV. γ-γ coincidence, E γ singles, excitation function, and the DCO ratios were measured. we have identified three intermediate bands with ΔI= 2 feeding the positive yrast band. The bands are interpreted as such candidate bands that are mixed with the negative-parity ground state band. This observation can provide a plausible explanation for unusually large population of the positive-parity yrast band observed in a recent Coulomb excitation.

High-spin states of the 117 Te nucleus were studied by in-beam γ-ray spectroscopy with the 103 Rh( 18 O ,p3n) fusion-evaporation reaction at a beam energy of 85 MeV. γ-γ coincidence and γ-γ angular correlation analyses were employed for determining the level scheme of 117 Te. The previously known states based on the ν h 11 2 orbital have been widely extended and some states have been corrected. Based on the TRS calculations, many unusually low-lying states in their excitation energies have been assigned to noncollective oblate states built on various quasiparticle configurations with β 2 ≈ 0.17 and γ = 60°. Meanwhile, in the positive-parity states built on the ν g 7 2 [413] 5 2 + and the ν d 5 2 [402] 5 2 + configurations, the vibrational- and the rotational structures have been found to coexist.

High-spin states in 117I have been studied via the 103Rh(18O, 4n) reaction at a beam energy of 85 MeV. Many deformed rotational bands built on the proton h11/2, g7/2, and g9/2 orbitals have been identified. Among them, an unfavoured rotational band and a quasi-gamma band based on the h11/2 state have been newly observed. Moreover, positive-parity states above Iπ= 35/2+ reported in the previous work have been rearranged. Several energetically favoured states have been assigned to noncollective oblate states based on various quasiparticle configurations with β2≈ 0.18–0.19 and γ= 60°.

High-spin states in ${}^{113}\mathrm{Sb}$ have been investigated by in-beam \ensuremath{\gamma}-ray spectroscopy with the ${}^{103}{\mathrm{R}\mathrm{h}(}^{16}\mathrm{O},\ensuremath{\alpha}2n)$ and ${}^{88}\mathrm{Sr}{(}^{28}\mathrm{Si},p2n)$ reactions at beam energies of 80 and 120 MeV, respectively. Two $\ensuremath{\Delta}I=1$ strongly coupled rotational bands were observed; one is a positive parity band that gains approximately 8\ensuremath{\Elzxh} in spin alignments as a result of the level crossing at $\ensuremath{\Elzxh}\ensuremath{\omega}\ensuremath{\sim}0.4$ MeV and the other is a negative parity band that shows no evidence of a level crossing below $\ensuremath{\Elzxh}\ensuremath{\omega}=0.48$ MeV. This negative-parity band has spin alignment of $7\ensuremath{\Elzxh},$ and is interpreted as intruder states of a $2p\ensuremath{-}1h$ $\ensuremath{\pi}[{(g}_{7/2}{)}^{2}\ensuremath{\bigotimes}{(g}_{9/2}{)}^{\ensuremath{-}1}]$ structure coupled to the two-quasineutron ${7}^{\ensuremath{-}}$ state of the ${}^{112}\mathrm{Sn}$ core. The previously observed decoupled rotational band involving $2p\ensuremath{-}2h$ excitations across the shell gap has been also confirmed.

High-spin states of the 115Te were studied by in-beam spectroscopy with the 89Y (29Si, p2n) fusion-evaporation reaction at a beam energy of 108 MeV. γ−γ coincidence and γ−γ angular correlation analyses were employed for determining the level scheme of 115Te. We have identified two vibrational-like bands built on the νh11/2 and νg7/2 quasiparticle states and the noncollective oblate states from the full alignment of quasiparticle configurations. In addition, a regular ΔI = 2 sequence with positive-parity was found for the first time in odd-A Te nuclei. This sequence is interpreted as a deformed structure resulting from three-quasiparticle alignment having the [π(g7/2, h 11/2) ⊗ ν(h 11/2)] configuration. Calculations of total Routhian surfaces and cranked shell model were performed and were used for assigning quasiparticle configurations to the states in 115Te.

The level structures of the very neutron-rich nuclei $^{128}\mathrm{Pd}$ and $^{126}\mathrm{Pd}$ have been investigated for the first time. In the $r$-process waiting-point nucleus $^{128}\mathrm{Pd}$, a new isomer with a half-life of $5.8(8)\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$ is proposed to have a spin and parity of ${8}^{+}$ and is associated with a maximally aligned configuration arising from the ${g}_{9/2}$ proton subshell with seniority $\ensuremath{\upsilon}=2$. For $^{126}\mathrm{Pd}$, two new isomers have been identified with half-lives of 0.33(4) and $0.44(3)\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$. The yrast ${2}^{+}$ energy is much higher in $^{128}\mathrm{Pd}$ than in $^{126}\mathrm{Pd}$, while the level sequence below the ${8}^{+}$ isomer in $^{128}\mathrm{Pd}$ is similar to that in the $N=82$ isotone $^{130}\mathrm{Cd}$. The electric quadrupole transition that depopulates the ${8}^{+}$ isomer in $^{128}\mathrm{Pd}$ is more hindered than the corresponding transition in $^{130}\mathrm{Cd}$, as expected in the seniority scheme for a semimagic, spherical nucleus. These experimental findings indicate that the shell closure at the neutron number $N=82$ is fairly robust in the neutron-rich Pd isotopes.

Experimental studies of neutron rich nuclei 8 He, 10 He, 12 Be and 13 Be have been performed using radioactive beams.

High-spin states of $^{114}\mathrm{Te}$ have been studied using the $^{89}\mathrm{Y}$${(}^{28}$Si,p2n) and $^{89}\mathrm{Y}$${(}^{29}$Si,p3n) reactions at beam energies of 106 and 108 MeV, respectively. \ensuremath{\gamma}-\ensuremath{\gamma} and particle-\ensuremath{\gamma}-\ensuremath{\gamma} coincidences, directional correlations of oriented states, and excitation functions have been measured using six BGO Compton suppressed Ge detectors and several particle detectors. We established the states of $^{114}\mathrm{Te}$ up to 9 MeV excitation energy and found the new two-phonon ${2}_{2}^{+}$, ${4}_{2}^{+}$, and ${6}_{2}^{+}$ states. The properties of the states in $^{114}\mathrm{Te}$ are discussed in comparison with the other even-even tellurium isotopes.

The top-emitting OLED has higher light efficiency comparing to the bottom-emitting OLED due to the high aperture ratio. In this paper, we have analyzed the optical characteristics of the encapsulation layer with the organic and inorganic multi-layer structure for top emitting OLED. The thickness of the layer structure is optimized to achieve high transmittance by the transfer matrix method. We also calculated the transmittance of organic/inorganic multilayer in terms of incident angle and wavelength. The transmittance of the multi-layers above 90% was achieved for whole incident angle in the visible range.

We investigated organic photovoltaic (OPV) cells using hole-electron separation interlayer for improving conversion efficiency. The novel structure of OPV cell was composed of ITO / PEDOT:PSS / DPASN / P3HT:PC 71 BM / Liq / Al. OPV device inserting DPASN has 2.28% of energy conversion efficiency higher than 1.99 % of conventional OPV cell. DPASN layer effected on blocking electron transfer to anode electrode by their LUMO and HOMO energy levels of DPASN whereas DPASN mixing layer with P3HT:PC 71 BM restricted holes and electrons separation in the active layer when light absorption occurred due to changing Voc.

Proton resonant states in 26Si have been studied by the resonant elastic scattering of 25Al+p with a 25Al radioactive ion beam at 2.863 MeV/nucleon bombarding a thick H2 gas target with the inverse kinematics method at the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator), University of Tokyo. The properties of these resonance states are important to better determine the production rates of 25Al(p,γ)26Si reaction, which is one of the astrophysically important nuclear reactions to understand the production of the ground state of 26Al, the emitter of its characteristic 1.809-MeV gamma-ray, under the explosive stellar environments such as novae and X-ray bursts. In this work, several resonances above the proton threshold level have been observed with a high statistics and background free through a covered the range of excitation energies from Ex ∼ 6.8 to 8.2 MeV.

A measurement of resonant elastic scattering of {sup 26}Si+p was performed with a thick target using a {sup 26}Si radioactive ion beam at the CRIB (CNS Radioactive Ion Beam separator) of the Center for Nuclear Study (CNS), the University of Tokyo. The excitation function of {sup 27}P was measured successfully with the inverse kinematics method through a covered the range of excitation energies from E{sub x}{approx} 2.3 to 3.8 MeV, providing information about the resonance structure of this nucleus. The properties of these resonances are important to better determine the production rates of {sup 26}Si(p,g){sup 27}P reaction, which is one of the astrophysically important nuclear reactions to understand the production of the {sup 26}Al. Some new resonant states have been investigated, and determined their resonance parameters, such as excitation energies, proton partial widths, and spin-parities by R-matrix calculation.

Target residues from the interaction of copper with 135 MeV/nucleon 12C ions have been studied by off-line γ-ray spectroscopy. Cross sections, average forward ranges, and forward-to-backward ratios were measured for 44 products. The data were used to obtain the isobaric-yield distribution, the mean-linear-momentum transfer, and the mean excitation energy. The results are compared with the previous ones from low- and high-energy experiments. The plateau of the recoil-velocity distribution observed at lower intermediate energies disappears at the present energy. The mean excitation energy approaches the limiting value at the present energy. The cross sections of spallation products with mass numbers between 2 3 A target and A target are similar to those observed at relativistic energies, which suggests limiting fragmentation.

The reactions 11 Li + CD 2 → 10 He + X and 11 Li + C → 10 He + X at a beam energy of 61A MeV have been studied by measuring the triple coincidence of 8He and two neutrons. Experimental data show a peak that can be explained as a resonance 10He, which is unbound by 1.2±0.3 MeV and its width is less than 1.2 MeV. Theinvariant mass spectra of 8He+n show a peak that is consistent with the decay 10 He → 8 He + n + n .

An experimental study of 8He + p elastic scattering and a search for 8He∗ as observed in two independent experimental methods. The obtained parameters of the excited state are E 8 He ∗ = 3.57±0.12 MeV , Γ =0.5±0.35 MeV, Γ 4 He+4n /Γ 6 He+n+n ⩽ 5% . Angular distributions for elastic and inelastic scattering are measured. The inelastic angular distribution is consistent with Jπ = 2+ for 8He3.55∗.

The population of the 0+ 0.228 MeV isomer of 26Al has been measured in projectile fragmentation reactions at E/A = 65, 80, and 100 MeV. For beams of 27Al and 28Si, the yield of the isomer was found to be approximately equal to that of the ground state, whereas for 40Ar beams it was much weaker. The significance and utility of the surprisingly high isomer yields is discussed.

Proton elastic scatterings of neutron rich nuclei 9 Li and 11 Li have been measured for the first time at E lab / A =60 and 62 MeV, respectively, under the inverse kinematical conditions. While the angular distribution of 9 Li scattering follows the systematic trend from those of 6 Li and 7 Li scatterings, the 11 Li cross section is smaller by about a factor of two. Optical model calculations show that considerable changes in both real and imaginary potentials are necessary to reproduce the 11 Li data.

High-Spin states of odd-odd 166Lu were populated using the 139La(30Si,3nγ)166Lu at a beam energy of 120 MeV. Twelve new γ-rays were placed on top of the previously known two rotational bands built upon πg 7/2⊗νi 13/2 and πh 11/2⊗νi 13/2. Extending high-spin states up to 21+ and 25− for each band, we have observed the onset of band crossing near ħω c ≈ 0.35 MeV. The band crossing frequency of the yrast πh 11/2⊗νi 13/2 band is consistent with the neutron BC band crossing observed in lighter odd-odd Lu isotopes.

High-spin states in 121Xe have been studied via the 109Ag (16O, p3n) 121Xe reaction at a beam energy of 80 MeV. Several rotational bands based on one- and three-quasiparticle excitations have been established. Among them, an unfavoured yrare rotational band with unfavoured signature has been newly identified.

The high-spin structures of $^{125}\mathrm{Xe}$ were studied by using in-beam \ensuremath{\gamma}-ray spectroscopy with the $^{116}\mathrm{Cd}$ ($^{13}\mathrm{C}$, 4n) $^{125}\mathrm{Xe}$ reaction at E${}_{\mathrm{lab}}=62$ MeV. The level scheme of $^{125}\mathrm{Xe}$ was constructed through the $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ coincidences and $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ angular directional correlation ratios. Several negative parity bands built on the neutron ${h}_{11/2}$ orbital were identified. In contrast to the yrast ${h}_{11/2}$ band with a large signature splitting, the second (yrare) ${h}_{11/2}$ band exhibits a small signature splitting, showing signature inversion below ${I}^{\ensuremath{\pi}}=23/{2}^{\ensuremath{-}}$. In addition, a band built on the $27/{2}^{\ensuremath{-}}$ level at 3619 keV was newly observed and found to be associated with a three quasiparticle alignment based on a neutron in the ${h}_{11/2}$ orbital coupled to a pair of protons in the ${h}_{11/2}$ orbital, namely, the $\ensuremath{\nu}[{h}_{11/2}]\ensuremath{\pi}[({h}_{11/2}){}^{2}]$ configuration.

In this Letter, blue phosphorescence organic light-emitting diodes (PHOLEDs) employ structures for electron and/or hole confinement; 1,3,5-tris(N-phenylbenzimiazole-2-yl)benzene is used as a hole confinement layer and tris-(phenylpyrazole)iridium [Ir(ppz)3] is utilized for an electron confinement layer (ECL). The electrical and optical properties of the fabricated blue PHOLEDs with various carrier-confinement structures are analyzed. Structures with a large energy offset between the carrier confinement and emitting layers enhance the charge-carrier balance in the emitting region, resulting from the effective carrier confinement. The maximum external quantum efficiency of the blue PHOLEDs with the double-ECLs is 24.02% at 1500 cd/m2 and its luminous efficiency is 43.76 cd/A, which is 70.47% improved compared to the device without a carrier-confinement layer.

White light-emitting devices based on a donor-acceptor structure were fabricated in order to investigate the dependence of the optical properties of white light emission on the thickness variance (15, 20, 25, and 30 nm) of the emissive layer. The emissive layer has a donor-acceptor system with the host 4,4′,4′′-tris(carbasol-l-nyl)triphenylamine molecule doped with 4,4′-bis(9-ethyl-3-carbazovinylene)-1,1′-biphenyl (BCzVBi) and 5,6,11,12-tetraphenylnaphtacene (Rubrene) molecules for blue and yellowish-green light activators, respectively. The characteristics of current density were analyzed by using a power function of applied field, J=σlEl+1 and the characteristic exponential function, J=J0(e(V-Vd)/V0-1). Through spectroscopic analysis, we obtained three physical quantities governing the device performance: 1) an effective conductivity, 2) a threshold potential, and 3) a characteristic potential barrier, which are associated with the trap-charge limited concentration in the bulk layer, the energy gap of t...

Blue organic light-emitting devices were fabricated with an activator of 4,4′-bis(9-ethyl-3-carbazovinylene)-1,1′-biphenyl doped into the various host materials such as N,N′-bis-(1-naphtyl)-N,N′-diphenyl-1,1-biphenyl-4,4′-diamine; 4,4′-bis(2,2′-diphenylyinyl)-1,1′-biphenyl; 2-methyl-9,10-di(2-naphthyl) anthracene; and 1,3,5-tris(N-phenylbenzimidazol-2-yl)benzene to investigate optical properties of blue light emission in the host-dopant system. By spectroscopic analysis based on multi-peak fits to the emission spectra, we found that energy transfer between the host and dopant molecules have a strong correlation with key features; current density, luminous efficiency, and color index for the devices. Among the present dopant-host systems, the TPBi molecule was found to be the best molecule as a host material for our devices. In contrast, the DPVBi host induced a complex excimer (electromer) leading to a shoulder spectrum with a longer wavelength emission. It was found that the electromer significantly affects the optical and electrical properties of the device.

High-spin states of odd-odd 168Lu were observed up to 18ħ for the first time using the 159Tb(13C, 4nγ)168Lu reaction at E 13C= 58.5 MeV. γ-γ coincidence, E γ singles, excitation function, and the DCO ratios were measured. Two rotational bands with signature splitting were populated, among which the lower-energy band is identified as π 7/2+[404] ⊗ν 5/2+[642] in view of alignment and energy systematics.

High-spin states of the even-even 116Te were studied by in-beam g-ray spectroscopy using the 103Rh (16O, p2n) fusion-evaporation reaction at a beam energy of 80 MeV. γ-γ coincidence and γ-γ angular correlation analyses were employed for determining the level scheme of 116Te. Levels up to Iπ = 27− and several new states were established. We identified two rotational bands with negative parity, one of which was newly established in the present work. We suggest that such two bands be associated with two proton [(g7/2) ⊗ (h11/2)] and two neutron [(d5/2) ⊗ (h11/2)] configurations, respectively.

High-spin states of 113Te were studied by in-beam spectroscopy using the 88Sr (28Si, 3n) fusion-evaporation reaction at a beam energy of 120 MeV. 7-7, charged particle-7-7 coincidences, and 7-7 angular correlation analyses were employed for determining the level scheme of 113Te. The levels based on the 11/2 - state in 113Te were identified for the first time. The present result of the level scheme of 113Te was in accord with the systematics of those in the heavier isotopes, namely 115Te and 117Te. A particularly favoured 37/2+ state was observed and suggested to be the fully aligned noncollective oblate 7r[(g9/2)2]6+ (h 11/2)2]25/2+ configuration.

High-spin states of the doubly-odd 112Sb were studied by in-beam spectroscopy using the 88Sr (28Si, p3n) and 89Y (29Si, α2n) fusion-evaporation reactions at beam energies of 120 and 108 MeV, respectively. γ−γ, charged particle-γ−γ coincidences, and γ−γ angular correlation analyses were employed for determining the level scheme of 112Sb. In the present work, all the levels except for low-lying states in 112Sb were newly established. Two ΔI = 1 strongly coupled bands were observed; one is a negative-parity band that is similar to those observed in the neighboring doubly-odd Sb isotopes and the other is a positive-parity band that has a new type structure not observed in the other isotopes. From the similarity of the properties of these ΔI = 1 bands to the bands built on 9/2+ 2p−1h states in the odd-A Sb isotopes, we suggest that these two ΔI = 1 bands should be associated with the [π(g9/2)−1 ⊗ νh11/2] and [π(g9/2)−1νg7/2] configurations, respectively.

High-spin states of115Sb were studied by inbeamγ-ray spectroscopy using the89Y (29Si, 2pn) fusionevaporation reaction at a beam energy of 108 MeV. The experiments includedγ-γ coincidence and directional correlation of oriented nuclei (DCO) ratio measurements using six BGO Compton suppressed Ge detectors. An intruderΔJ=2 rotational band has been identified for the first time and it is interpreted as the h11/2 proton coupled to a two particle-two hole (2p − 2h) deformed state of the114Sn core. A ΔJ=1 rotational band based on the 2p − 1h, π{g 7 2/2 ⊗g 9 2/−1 }, configuration has been extended to the 29/2+ state at an excitation energy of 5241 keV.

High spin states in the nucleus156Ho have been studied via the fusion-evaporation reaction140Ce(19F,3nγ)156Ho at the beam energy of 82 MeV.γ-γ coincidences, Eγ, Iγ and excitation functions have been measured. With two rotationally-aligned bands identified as π[h11/2]ν [i13/2], we found two new bands with a signature splitting, whose structure is believed to arise from either ν[h9/2] or ν[f7/2] coupled to π[h11/2]. Our placement of γ rays belonging to these new bands suggests that the previously known level scheme should be corrected. We also found many new low-energy γ rays in the low excitation energy. As compared to154Ho, the present nucleus with two more neutrons becomes more collective, and shows well-observed rotationally-aligned bands with a clear signature splitting.

154Ho was studied via141Pr(16O,3n) reaction at beam energy of 75 MeV. We found two new rotationally aligned bands made of neutron h9/2 and f7/2 orbitals coupled to a proton h11/2 orbital. As with several new high-spin states, up to I=20, the ground state band with odd parity starts to show anomalous signature splitting at I=13 in this doubly odd154Ho. The observed rotational bands in154Ho are quite consistent with the onset of collectivity which appears in general at neutron number of 87 in neutron-deficient rare-earth nuclei.

High spin states in115Te have been studied using the89Y (29Si, p2n) reaction at a beam energy of 108 MeV.γ-γ coincidence, Eγ, Iγ and excitation functions have been measured. The level scheme has been extended to 82 MeV excitation energy relative to the 11/2 state and several new states are established. The systematical behaviour in odd- N Te isotopes is discussed.

The electroluminescent characteristics of white organic light-emitting diodes (WOLEDs) were investigated including single emitting layer (SEL) with an ADN host and dopants; BCzVBi, C545T, and DCJTB for blue, green and red emission, respectively. The structure of the high efficiency WOLED device was; ITO/NPB(700 A)/ADN: BCzVBi-7%:C545T-0.05%:DCJTB-0.1%(300 A)/Bphen(300 A)/Liq(20 A)/Al(1200 A) for mixing three primary colors. Luminous efficiency was 9.08 cd/A at 3.5 V and Commission Intenationale de L’eclairage (CIEx,y) coordinates of white emission was measured as (0.320, 0.338) at 8 V while simulated CIEx,y coordinates were (0.336, 0.324) via estimation from each dopant's PL spectrum.

Physics letters / B 760, 641 - 646 (2016). doi:10.1016/j.physletb.2016.07.057, Published by North-Holland Publ., Amsterdam