Determination Multipole Mixing Ratios and Transition Strengths of Gamma Rays from Level Studies of 93Mo （p, nγ） Reaction

The multipole mixing ratios have been calculated by a2-ratio method, from levels of 93Mo（p, nγ） reaction. The branching ratios of such γ-transitions are used to calculate the total gamma widths. Besides, the transition strengths and probabilities have been calculated for γ-transitions from excited states whose life times have been reported previously. The results are found to be in general in good agreement with the previous results populated from the previous work.

Static or dynamic pear shapes in radioactive nucleus ^(224)Rn?

We report a comprehensive study on low-lying parity doublet states of ^(224)Rn by mixing both quadrupole-and octupoleshaped configurations in multireference covariant density functional theory,in which broken symmetries in configurations are restored using projection techniques.The low-lying energy spectrum is reasonably reproduced when the shape fluctuations in both the quadrupole and octupole shapes are considered.Electric octupole transition strength in ^(224)Rn is found to be B(E3;3_(1)^(-)→0_(1)^(+))=43 W.u.,comparable to that in ^(224)Ra,whose data are 42(3)W.u..Our results indicate that ^(224)Rn shares similar low-energy structure with ^(224)Ra despite the excitation energy of first 3^(−)state of the former nucleus is higher than that of the latter.This study suggests ^(224)Rn is a candidate for the search for permanent electric dipole moment.

Mechanical Properties and ITZ Microstructure of Recycled Aggregate Concrete Using Carbonated Recycled Coarse Aggregate

The effect of carbonation treatment and mixing method on the mechanical properties and interfacial transition zone（ITZ） properties of recycled aggregate concrete（RAC） was investigated. Properties of recycled concrete aggregate（RCA） were tested firstly. Then, five types of concretes were made and slump of fresh concrete was measured immediately after mixing. Compressive strength and splitting tensile strength of hardened concrete were measured at 28 d. Meanwhile, the microstructure of RAC was analyzed by backscattered electron（BSE） image. It was found that the water absorption ratio of carbonated recycled concrete aggregate（CRCA） was much lower when compared to the untreated RCA. Comparatively, the apparent density of CRCA was not significantly modified. The concrete strength results indicate that the mix CRAC-2 prepared with CRCA by adopting two-stage mixing approach shows the highest compressive strength value compared to the other mixes. The microstructural analysis demonstrate that the mix CRAC-2 has a much denser old ITZ than the untreated RAC because of the chemical reaction between CO2 and the hydration products of RCA. This study confirms that the ITZ microstructure of RAC can be efficiently modified by carbonation treatment of RCA and encourages broadening the application of construction and demolition wastes.

Microscopic Cluster Study of the ^(10)Be Nucleus

Using a microscopic four-body cluster model,we investigate the spectral properties and structural configurations of the ^(10)Be nucleus.We calculate physical quantities such as the root-mean-squared(r.m.s.)radii and electromagnetic transition strengths.The theoretical results for the energies and certain electromagnetic transition strengths of the low-lying states show good agreement with experimental data.In particular,the enhancement of the r.m.s.radius and isoscalar monopole transition strength of the O_(3)^(+) state indicates a well-developed cluster structure.We obtained three 1-states in E_(x)<15 MeV that show remarkable dipole transition strengths,suggesting that the 1-states may have cluster structure.Using the obtained wave functions,we calculate the reduced-width amplitudes(RWAs)to investigate the SHe+α and'Be+n two-body cluster structures in ^(10)Be.The results suggest that the lowlying states show the two-body ^(6)He+α and ^(9)Be+n configuration,with the ^(6)He+α components of the two-body structure diminishing as the energy increases,which due to the breakup of He and ^(9)Be at higher excitation energies.Moreover,a few states above the α+α+n+n threshold still exhibit significant 9Be+n components.

Description of spectrum and electromagnetic transitions in ^(94)Mo through the proton-neutron interacting boson model

We investigated the properties of low-lying states in ^(94)Mo within the framework of the proton-neutron interacting boson model(IBM-2), with special focus on the characteristics of mixed-symmetry states. We calculated level energies and M1 and E2 transition strengths. The IBM-2 results agree with the available quantitative and qualitative experimental data on ^(94)Mo. The properties of mixed-symmetry states can be well described by IBM-2 given that the energy of the d proton boson is different from that of the neutron boson, especially for the transition of B(M1, 4_2^+→ 4_1^+).

Description of mixed symmetry states in 96Ru using IBM-2

We have investigated the properties of low-tyiag states iu 96Ru within the framework of the neutron-proton interacting boson model （IBM-2）, with special attention paid to the characteristics of the mixed symmetry states. By considering the relative energy of d proton boson to be different from that of neutron boson, the level energies and M1, E2 transition strengths have been calculated. The IBM-2 calculation is consistent with the experimental data of 96Ru both quantitatively and qualitatively. Particularly, the strong M1 transition between the 42^＋ and 41^＋ states has been reproduced nicely. The calculated results show that the M1 transition strength of B（M1,42^＋ → 41^＋） in 96Ru carl be described successfully by the IBM-2.

Nuclear structure of ^(76)Ge from proton-neutron interacting boson model calculations

The properties of low-lying states in 76Ge, especially the characteristics of the mixed-symmetry states, have been investigated within the neutron-proton interacting boson model （IBM-2）. By considering the relative energy of d proton boson to be different from that of neutron boson, the low-lying positive parity levels and M1, E2 transition strengths have been calculated. The IBM-2 calculated results are in good agreement with the experimental data. Particularly, the mixed-symmetry states have been reproduced quite well. The calculation and systematic analysis demonstrated that the collective character of 76Ge lies closest to the SUπv^＊（3）, with some possible Oπv（6） dynamic symmetry in IBM-2 viewpoint.

Shape coexistence close to N=50 in the neutron-rich isotope ^(80)Ge investigated by IBM-2

The properties of the low-lying states especially the relevant shape coexistence in 80Ge, close to one of most neutron-rich doubly magic nuclei at N 50 and Z = 28, have been investigated within the framework of the proton-neutron interacting model （IBM-2）. Based on the fact that the relative energy of the d neutron boson is different from that of the proton boson, the calculated energy levels of low-lying states and E2 transition strengths can reproduce the experimental data very well. Particularly, the first excited state 0＋, which is intimately related to the shape coexistence phenomenon, is reproduced quite nicely. The p2（E0,02＋→01＋） transition strength is also predicted. The experimental data and theoretical results indicate that both collective spherical and γ-soft vibration structures coexist in 80Ge.