共查询到20条相似文献,搜索用时 15 毫秒
1.
应用壳模型方法计算了O17和F17的低能反宇称态。核子间剩余相互作用取为δ型核力。第一步在L-S耦合近似下求解方程。结果表明,低能态具有“配对”的相干结构。第二步用一种近似办法加进了自旋轨道耦合力,得到了可以和实验进行比较的能谱。计算了已有实验数据的跃迁几率。 相似文献
2.
The first six excited states of 17N have been studied by using the 18Ot, αγ)17N reaction at a bombarding energy of Et = 3.5 MeV. Alpha-gamma angular correlation measurements (method II) were used to determine spins, mixing ratios and branching ratios. The 1.37, 1.85, 1.91, 2.53, 3.13 and 3.20 MeV levels have been assigned the spins , , ?, +, and respectively. Excitation energies are also given. Most of the results are in good agreement with previous data or suggested values. Mixing ratios have been obtained for the first time. The level scheme of 17N is compared with some analogue states in 17O and 17F and with results of recent shell-model calculations. 相似文献
3.
D. Hartwig G. Th. Kaschl G. Mairle G. J. Wagner 《Zeitschrift für Physik A Hadrons and Nuclei》1971,246(5):418-423
Ten states of17N have been excited via the18O(d,3He)17N reaction atE itd=52 MeV. Thel-transfer values are presented for eight of these states. Based on the subsequent spin and parity assignments severalT=3/2 isobaric multiplets are proposed. 相似文献
4.
Birefringent properties of PLZT ceramics (Pb83La17)(Zr30Ti70)O3 were investigated by measuring the transverse electrooptic effect in a 0.2 mm-thick wafer at various speeds of external voltage
changes. At least two types of internal polarized microregions of different physical nature in charge of the electrooptical
properties are observed. 相似文献
5.
Inelastic electron scattering experiments were performed on a17O gas target in a range of momentum transfer q = 0.6?1.1fm?1; B(E3) values for twelve odd-parity levels were obtained from the measured Coulomb form factors. The results are discussed in terms of the weak coupling model. 相似文献
6.
V. Rosenbush N. Kiselev L. Kolokolova S. Velichko F. Velichko K. Antoniuk S. Kolesnikov 《Journal of Quantitative Spectroscopy & Radiative Transfer》2009,110(14-16):1719-1725
We present results of polarimetric observations of comet 17P/Holmes that in 2007 surprised the observers by its outburst that resulted in dramatically increased brightness and unusual shape of the coma. Polarimetric properties of the comet also appeared to be very peculiar. Even though the comet showed negative polarization typical for the small phase angles, its absolute values were much lower than usually observed at these phase angles and the spectral gradient of the polarization was much more pronounced than usually observed for comets (although negative that is typical for other comets too). Both these results are different from the regular trends and indicate some specifics of the comet Holmes dust during the outburst. We discuss how such unusual polarimetric properties of the comet can be explained and show how a peculiar combination of aggregated and compact particles or a composition with a unique ratio of silicates to organics can explain the observational results. 相似文献
7.
8.
Hiroaki Tanno Shuxiu Zhang Tsutae Shinoda Hiroshi Kajiyama 《Journal of luminescence》2010,130(1):82-86
The relation between photoluminescence and thermoluminescence from Eu-doped BAM (BaMgAl10O17) and SAM (SrMgAl10O17) are investigated. The emission peak of SAM:Eu shifts from 463 to 489 nm whereas that of BAM:Eu only shifts 3 nm at 450 nm as temperature decreased from 300 to 50 K under 146 nm excitation. This can be explained by the fact that there are Beevers–Ross (BR) and mid-oxygen (mO) sites for Eu ions in SAM. The emission peak around 463 nm from SAM:Eu is ascribed to Eu ions in the mO site, while the peak around 489 nm is ascribed to ones in the BR site in SAM host. From the result of thermal degradation of SAM:Eu, it is confirmed that the Eu ions located at mO site are easy to degrade compared with those located at BR site. The thermal degradation of BAM:Eu phosphor becomes large with the increase in Eu concentration. We suggest that the thermal degradation of BAM:Eu phosphor is due to the tendency of Eu ions to occupy the mO site. 相似文献
9.
The crystal structure and magnetic properties of R2Fe17-xCrx(R=Dy,Er,0≤x≤3) compounds have been investigated by me ans of X-ray diffraction and magnetization measurements. These compounds have hexagonal Th2Ni17-type structure. The unit-cell volumes decrease with the increase of Cr concentration x. The Curie temperature Tc of the Er2Fe17-xCrx compounds increases from 320 K for x=0 to 403 K for x=1.0 and then decreases with further increase of x. The Cur ie temperat ure Tc of Dy2Fe17-xCrx compounds increases from 364 K for x=0 to 435 K for x=1.0 and then decreases with further increase of x. The saturation magnetization of these compounds shows an approximately linear decrease with the increase of x. Spin reorientation transitions occur s in Er2Fe17-xCrx(x=2.0 and 3.0). 相似文献
10.
The magnetization curves along the crystal axes for Gd_2Fe_{17} and Gd_2Fe_{17}H_3 were analysed based on the single-ion model. If the Gd-Fe exchange interaction has been taken as isotropic as usual, the fitted values of magneto-crystalline anisotropy of the Fe sublattices in Gd_2Fe_{17} and Gd_2Fe_{17}H_3 would become unreasonably different from those of the corresponding Y or Lu compounds. It was shown that the large difference is caused by the neglect of the anisotropy of the Gd-Fe exchange interaction. 相似文献
11.
The pure rotational spectra of H212C17O and H213C17O have been investigated in the frequency region between 8 and 360 GHz in the ground vibrational state. For both isotopic species the 17O nuclear quadrupole coupling constants and spin-rotation constants have been obtained. From both Q- and R-branch transitions a set of rotational constants and several distortion constants could be derived employing Watson's formalism in A reduction. The obtained rotational constants are in Megahertz:
H212C17O | H213C17O | |
281 965.0 (30) | 281 987.3 (19) | |
37 812.287(45) | 36 776.790(25) | |
33 214.523(31) | 32 412.920(19) |