• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Systematic study of α decay half-lives for even–even nuclei within a deformed twopotential approach

    2022-06-29 07:53:56HaiFengGui桂海峰HongMingLiu劉宏銘XiJunWu吳喜軍PengChengChu初鵬程BiaoHe何彪andXiaoHuaLi李小華
    Communications in Theoretical Physics 2022年5期

    Hai-Feng Gui(桂海峰),Hong-Ming Liu(劉宏銘),Xi-Jun Wu(吳喜軍),Peng-Cheng Chu(初鵬程),Biao He(何彪) and Xiao-Hua Li(李小華),5,6,7

    1 School of Nuclear Science and Technology,University of South China,421001 Hengyang,China

    2 School of Math and Physics,University of South China,Hengyang 421001,China

    3 The Research Center for Theoretical Physics,Science School,Qingdao University of Technology,Qingdao 266033,China

    4 College of Physics and Electronics,Central South University,Changsha 410083,China

    5 National Exemplary Base for International Sci &Tech.Collaboration of Nuclear Energy and Nuclear Safety,University of South China,Hengyang 421001,China

    6 Cooperative Innovation Center for Nuclear Fuel Cycle Technology &Equipment,University of South China,421001 Hengyang,China

    7 Key Laboratory of Low Dimensional Quantum Structures and Quantum Control,Hunan Normal University,410081 Changsha,China

    Abstract In this work,we systematically study the α decay half-lives of 196 even–even nuclei using a two-potential approach improved by considering nuclear deformation.The results show that the accuracy of this model has been improved after considering nuclear deformation.In addition,we extend this model to predict the α decay half-lives of Z=118 and 120 isotopes by inputting the α decay energies extracted from the Weizsacker–Skyrme-type(WS-type)mass model,a simple nuclear mass formula,relativistic continuum Hartree–Bogoliubov theory and Duflo-Zuker-19(DZ19)mass model.It is useful for identifying the new superheavy elements or isotopes for future experiments.Finally,the predicted α decay energies and half-lives of Z=118 and 120 isotopes are analyzed,and the shell structure of superheavy nuclei is discussed.It shows that the shell effect is obvious at N=184,while the shell effect at N=178 depends on the nuclear mass model.

    Keywords:α-decay,deformed two-potential approach,superheavy nuclei,magic number

    1.Introduction

    In 1899,Rutherford firstly discovered the natural α radioactivity phenomenon from uranium and uranium compounds.Later on,Gurney and Condon[1]and Gamow[2]proposed the quantum tunneling theory to explain this process independently.α decay is the main decay mode of the unstable nuclei,the study on α decay can provide abundant nuclear structural information,such as the ground-state properties,level structure,shell closure effect and so on[3–7].In addition,α decay plays an important role in identifying the new elements and synthesising superheavy nuclei[8–17].Therefore,α decay has become one of the hottest topics in nuclear physics.Based on the description of Gamowet al,up to now,a lot of empirical formulas or theoretical models have been developed to study α decay,such as Coulomb and proximity potential model[18],density-dependent cluster model[19,20],universal decay law[21],Royer formula[22],Gamow-like model[23],two-potential approach(TPA)[24]and others[25,26].

    The study of superheavy nuclei has always been a hot topic[27–39].In recent years,the effect of deformation has attracted more and more attention to the study of superheavy nuclei[40–50].Some research shows that the deformation has a certain influence on the calculation of α decay half-lives[46,47,51].Recently,Hassanzadet al[52]systematically studied the favored α decay half-lives of deformed nuclei with 93 ≤Z≤118 using deformed Coulomb and proximity potential model.Their results indicated that the deformation has a certain effect on α decay half-lives.Therefore,it is necessary to modify the TPA by considering the effect of nuclear deformation,this is our first motivation of the article.In addition,the magic numbers of superheavy nuclei has also attracted the attention of researchers.Recently,by exploring the properties of α decay ofZ=118 and 120 isotopes,an obvious shell effect atN=178 is found besides that atN=184.It is well known that the model dependence on the shell effect atN=184[17,53–55]is not strong.However,the new magic numberN=178 has not been confirmed by other models.In order to test whetherN=178 is a new magic number,it is necessary to use the improved TPA to study the alpha-decay properties ofZ=118 and 120 isotopes.This is the second motivation of this paper.Driven by the two above motivations,we will improve the TPA by taking into account the nuclear deformation and further investigate the α decay properties of unstable nuclei,especially for the case of the superheavy nuclei.

    The article is organized as follows.The theoretical framework of the deformed TPA is briefly presented in section 2.The detailed calculations and discussion are given in section 3.A summary is given in section 4.

    2.Theoretical framework

    Figure 1.The difference in logarithmic form of α decay half-lives between experimental data and calculated ones.The abscissa is the mass number A and the ordinate is the value of .The black square and red dot represent the theoretical value calculated by using the TPA without considering deformation and after considering deformation,respectively.

    Table 1.Comparison of the experimental data for α decay nuclei with calculated results.The deformation parameters β2,β4 and β6 are take from FRDM2012[78].The Qα are taken from the AME2020[72].The experimental α decay half-livesare taken from the NUBASE2020[71].is the logarithm of half-life calculated by TPA without considering deformation,andis the logarithm of half-life calculated by TPA considering deformation.

    Table 1.Comparison of the experimental data for α decay nuclei with calculated results.The deformation parameters β2,β4 and β6 are take from FRDM2012[78].The Qα are taken from the AME2020[72].The experimental α decay half-livesare taken from the NUBASE2020[71].is the logarithm of half-life calculated by TPA without considering deformation,andis the logarithm of half-life calculated by TPA considering deformation.

    α transitionβ2β4β6Qα(MeV)Pα exp lg 1 2 Ts()cal 1()cal 2()lg 1 2 Ts()lg 1 2 Ts()1041000.0000.0000.0005.1000.341?8.398?7.006?7.006→TeSn→1061020.1190.0660.0184.2900.247?4.108?3.688?3.809→TeSn 1081040.1390.056?0.0033.4200.2550.6280.9870.859 108Xe →104Te0.1620.073?0.0084.5700.390?4.143?4.038?4.212 110Xe →106Te0.1730.063?0.0183.8720.258?0.840?0.480?0.665 112Xe →108Te0.1950.054?0.0193.3300.2772.3242.8372.616 114Ba →110Xe0.2180.059?0.0253.5920.2711.6942.3862.108 144Nd →140Ce0.0000.0000.0001.9010.19622.85923.61323.613 146Sm →142Nd0.0000.0000.0002.5290.19815.33215.88715.887 148Sm →144Nd0.1720.0600.0091.9870.19523.29823.93823.605 148Gd →144Sm0.0000.0000.0003.2710.1999.3529.6919.691 150Gd →146Sm0.1720.0470.0172.8070.20213.75214.16113.862 150Dy →146Gd0.0000.0000.0004.3510.2363.1073.2233.223 152Gd →148Sm0.2050.053?0.0012.2040.22121.53222.03321.642 152Dy →148Gd0.1720.0350.0053.7270.2396.9307.2336.997 152Er →148Dy?0.0840.014?0.0014.9340.2391.0571.2011.159 154Dy →150Gd0.2050.041?0.0042.9450.23813.97614.07913.732 154Er →150Dy0.1500.0450.0064.2800.2574.6774.7154.507 154Yb →150Er?0.1040.0280.0075.4740.235?0.355?0.268?0.335 156Er →152Dy0.2050.028?0.0063.4810.2529.98910.42210.111 156Yb →152Er0.1390.0440.0064.8100.2572.4082.8222.637 156Hf →152Yb?0.0840.014?0.0016.0260.270?1.638?1.623?1.664 158Hf →154Yb0.1280.0300.0035.4050.2460.8080.9630.830 158W →154Hf0.0850.0030.0006.6130.241?2.845?2.810?2.850 160Hf →156Yb0.1610.022?0.0074.9020.2553.2763.3673.180 160W →156Hf0.1280.0180.0026.0660.273?0.989?0.914?1.029 162Hf →158Yb0.1830.013?0.0094.4160.2415.6876.1345.902 162W →158Hf0.1500.0200.0025.6780.2440.4200.6840.521 162Os →158W0.107?0.0080.0096.7680.237?2.678?2.524?2.590 164W →160Hf0.173?0.001?0.0015.2780.2512.2182.4592.273 164Os →160W0.1290.0060.0006.4790.271?1.662?1.618?1.722 166W →162Hf0.1840.001?0.0114.8560.2314.7384.6384.420 166Os →162W0.151?0.004?0.0016.1430.247?0.593?0.356?0.493 166Pt →162Os?0.1050.0040.0007.2920.238?3.532?3.446?3.503 168W →164Hf0.206?0.009?0.0034.5010.2366.2006.6636.398 168Os →164W0.173?0.013?0.0035.8160.2470.6851.0410.767 168Pt →164Os0.1180.0050.0006.9900.272?2.695?2.484?2.673 170Os →166W0.184?0.012?0.0035.5370.2371.8892.2601.956 170Pt →166Os0.129?0.006?0.0016.7070.242?1.856?1.511?1.712 170Hg →166Pt?0.094?0.0200.0027.7700.283?3.509?4.110?4.254 172Os →168W0.195?0.010?0.0035.2240.2403.2073.7283.394 172Pt →168Os0.140?0.005?0.0016.4630.254?0.994?0.693?0.914 172Hg →168Pt?0.105?0.0190.0027.5240.277?3.636?3.421?3.575 174Hf →170Yb0.288?0.043?0.0162.4940.14422.80024.52523.927 174Os →170W0.217?0.007?0.0044.8710.2265.2515.5985.203 174Pt →170Os0.162?0.003?0.0016.1830.2250.0610.3960.133 174Hg →170Pt?0.105?0.0190.0027.2330.249?2.699?2.510?2.664 176Pt →172Os0.2390.0210.0025.8850.2611.1971.5041.022 176Hg →172Pt?0.115?0.0300.0046.8970.267?1.651?1.460?1.627 178Pt →174Os0.2500.011?0.0015.5730.2272.4282.9302.434 178Hg →174Pt?0.125?0.0170.0036.5770.248?0.526?0.317?0.496 178Pb →174Hg0.0110.0000.0007.7890.227?3.602?3.432?3.530 180W →176Hf0.243?0.065?0.0072.5150.16225.70125.67925.292 180Pt →176Os0.251?0.002?0.0045.2760.2054.0284.2993.914 180Hg →176Pt?0.135?0.005?0.0086.2590.2650.7300.7510.654 180Pb →176Hg0.0000.0000.0017.4190.248?2.387?2.476?2.475 182Pt →178Os0.219?0.031?0.0084.9510.1875.6236.0685.779 182Hg →178Pt?0.146?0.0040.0015.9960.2541.8921.8251.711 182Pb →178Hg0.0110.0000.0007.0660.234?1.260?1.324?1.326 184Pt →180Os0.219?0.044?0.0014.5990.1867.7688.1467.857 184Hg →180Pt?0.146?0.0040.0015.6600.2423.4423.3283.210 184Pb →180Hg0.0000.0120.0006.7740.236?0.213?0.333?0.334 186Os →182W0.209?0.0830.0032.8210.15722.80022.93622.620 186Pt →182Os0.208?0.058?0.0024.3200.1739.72810.0049.727 186Hg →182Pt?0.146?0.0040.0015.2040.2475.7015.5885.466 186Pb →182Hg0.0000.0000.0006.4710.2301.0720.7900.790 186Po →182Pb0.3300.016?0.0128.5010.314?4.469?5.172?5.668 188Pt →184Os0.186?0.061?0.0014.0070.21612.52812.19911.958 188Hg →184Pt?0.146?0.0150.0034.7090.2398.7228.4538.332 188Pb →184Hg0.0000.0000.0006.1090.2212.4682.2652.265 188Po →184Pb0.308?0.002?0.0068.0820.275?3.569?3.991?4.433 190Pt →186Os0.163?0.0510.0023.2690.20319.18318.98418.784 190Pb →186Hg0.0000.0000.0005.6980.2164.2454.1114.111 190Po →186Pb?0.2170.017?0.0017.6930.262?2.611?2.799?3.028 192Pb →188Hg0.0000.0000.0005.2220.2046.5466.5516.551 192Po →188Pb?0.2170.017?0.0017.3200.257?1.492?1.635?1.870 194Pb →190Hg0.0000.0000.0004.7380.1959.9449.4129.412 194Po →190Pb?0.2070.015?0.0016.9870.235?0.407?0.478?0.702 194Rn →190Po?0.2370.020?0.0027.8620.261?3.108?2.590?2.862 196Pb →192Hg0.0000.0000.0004.2380.1779.86912.91112.911 196Po →192Pb0.0850.0030.0006.6580.2160.7750.7800.725 196Rn →192Po?0.2270.019?0.0027.6170.256?2.328?1.851?2.110 TeSn

    Table 1.(Continued.)

    Table 1.(Continued.)

    Table 2.The Qα and prediction half-lives of α decay in even–even nuclei with Z=118 and Z=120.The deformation parameters β2,β4 and β6 are take from WS4[77],and the binding energy or mass excess required to calculate the Pα and Qα are respectively from each mass table.indicate that the data are from mass tables WS-type[73],SNMF[74],RCHB[75]and DZ19[76],and the unit is MeV.are the logarithms of the corresponding calculated half-life,in s.

    Table 2.The Qα and prediction half-lives of α decay in even–even nuclei with Z=118 and Z=120.The deformation parameters β2,β4 and β6 are take from WS4[77],and the binding energy or mass excess required to calculate the Pα and Qα are respectively from each mass table.indicate that the data are from mass tables WS-type[73],SNMF[74],RCHB[75]and DZ19[76],and the unit is MeV.are the logarithms of the corresponding calculated half-life,in s.

    Nucleusα?QWStypeQαSNMFQαRCHBQαDZ19?T lg 1 2 WS type T lg 1S 2NMF T lg 1R 2CHB T lg 1D 2Z19 29211812.0711.9310.9711.95?3.65?3.51?0.98?3.56 29411811.8911.7210.9211.56?3.27?3.08?0.89?2.69 29611811.8911.5210.7811.18?3.29?2.64?0.56?1.81 29811811.8611.3410.6210.84?3.24?2.21?0.12?0.92 30011811.7511.1710.4810.52?3.08?1.820.26?0.10 30211811.6511.0210.6210.23?2.83?1.47?0.010.69 30411812.3611.0512.6611.92?4.60?1.58?5.15?3.61 29612013.1612.6511.8812.21?5.41?4.55?2.59?3.59 29812013.0912.4511.7711.81?5.28?4.15?2.37?2.70 30012013.0512.2611.6311.43?5.25?3.74?2.04?1.80 30212012.8112.0811.5211.08?4.80?3.36?1.78?0.93 30412012.6611.9111.7310.75?4.55?3.01?2.16?0.08 30612013.2912.0113.5913.12?5.95?3.28?6.41?5.56 30812013.0711.8213.0812.68?5.78?3.11?5.69?4.93

    3.Results and discussion

    Based on the experimental data,using TPA,we obtain σ(1)=0.573 without considering nuclear deformation,and σ(2)=0.506 after considering nuclear deformation.These results show that there is indeed some improvement after considering deformation.In other words,the calculation results of TPA are in better agreement with the experimental data.For a more intuitive comparison of this standard deviations,the difference in logarithmic form of α decay half-lives between experimental data and calculated one is shown in figure 1.From this figure,we can see that the deviations in the two regions i.e.158 ≤A≤180 and 222 ≤A≤254 are obviously larger.This clearly shows the influence of nuclear deformation on the calculation results.The overall calculation result is better,although there is a slight deviation at some points,such asA=254,256 and 258.We speculate that this may be caused by the difference between the theoretical value and actual value of the deformation parameters(β2,β4and β6).In other words,if the experimental data and the model formula used are reliable,we may be able to take the experimental value as the input and use this model to reverse the deformation parameter.We will consider making an attempt in this regard and expect experimenters to measure these nuclei.

    In order to provide a reference for the synthesis of new elements,we extend this model to predict the α decay halflives of 14 even–even nuclei withZ=118 andZ=120 in the following.As we all know,in the α decay,the half-lifeT1/2is extremely sensitive toQα.Therefore,to obtain the precise predictions of α decay half-lives for the heavy and superheavy nuclei,the method of selecting a more preciseQαis at the heart of the matter.In this work,we use four mass tables i.e.WS-type[73],simple nuclear mass formula(SNMF)[74],relativistic continuum Hartree–Bogoliubov(RCHB)[75]and DZ19[76],to obtainQα.The calculated results are listed in table 2.In this table,the first column is α decay parent nucleus,and the second to fifth columns are the differentQαfrom the four mass tables,respectively.The last four columns are the logarithmic form of α decay half-lives corresponding to the four mass tables.To see more intuitively,the value ofQαand predicted α decay half-lives for even–even nuclei withZ= 118 and 120 are drawn in figure 2.In this figure,we can clearly see thatN=184 has an obvious shell effect.However,the shell effect ofN=178 is not observed.TheQαin this figure are from the mass tables:WS-type[73],SNMF[74],RCHB[75]and DZ19[76].Combined with the mass table quoted by Cuiet al:WS4[77],FRDM[78],KTUY[79]and GHFB,it is not difficult to draw a conclusion:N=184 is a magic number,but the shell effect ofN=178 is dependent on models.This information may help to provide a reference for future work.

    Figure 2.The value of Qα and predicted α decay half-lives for even–even nuclei with Z=118 and 120 isotopes.The black square and red dot indicate Z=118 and Z=120,respectively.The abscissa is neutron number N,the ordinate in the left column is Qα in Mev,and the ordinate in the right column is logarithmof calculated half-life in s.The mass tables used from top to bottom in this figure are WS-type[73],SNMF[74],RCHB[75]and DZ19[76].

    4.Summary

    In this work,the TPA is extended to the study of deformed nuclei.Through a systematic study of α decay half-lives for 196 even–even nuclei,we find that TPA after taking deformation into account are in better agreement with the experimental data.In addition,the α decay half-lives of 14 even–even nuclei withZ=118 andZ=120 isotopes are predicted by using the four mass tables of WS-type,SNMF,RCHB and DZ19.Combining the mass tables(WS4,FRDM,KTUY,GHFB)used in Cuiet al?s work,we can conclude thatN=184 is a magic number andN=178 is dependent on models.This work will help to provide reference to the future research.

    Acknowledgment

    Supported by the National Natural Science Foundation of China(Grants No.12 175 100 and No.11 975 132),the Construct Program of the Key Discipline in Hunan Province,the Research Foundation of Education Bureau of Hunan Province,China(Grant No.18A237),the Innovation Group of Nuclear and Particle Physics in USC,the Shandong Province Natural Science Foundation,China(Grant No.ZR2019YQ01),Hunan Provincial Innovation Foundation For Postgraduate(Grant No.CX20210942 and No.CX20200909),the Opening Project of Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment,University of South China(Grant No.2019KFZ10).

    Appendix.Calculation formula of coulomb potential

    ORCID iDs

    嫩草影院精品99| 日本色播在线视频| 亚洲精品成人久久久久久| 午夜福利高清视频| 亚洲精品aⅴ在线观看| 午夜福利高清视频| 日产精品乱码卡一卡2卡三| 免费高清在线观看视频在线观看| av免费观看日本| 看非洲黑人一级黄片| 亚洲欧洲国产日韩| 少妇丰满av| 久久久久久伊人网av| 激情五月婷婷亚洲| 亚洲综合精品二区| 亚洲天堂国产精品一区在线| 日本免费在线观看一区| 最近最新中文字幕免费大全7| 18禁在线播放成人免费| 国产69精品久久久久777片| 波多野结衣巨乳人妻| 午夜福利网站1000一区二区三区| 2018国产大陆天天弄谢| 国产人妻一区二区三区在| 国产成人精品一,二区| 欧美区成人在线视频| 亚洲欧洲国产日韩| 亚洲精品国产av成人精品| 亚洲av在线观看美女高潮| 免费大片黄手机在线观看| 深夜a级毛片| 亚洲av免费在线观看| 五月开心婷婷网| 免费黄网站久久成人精品| 国产日韩欧美亚洲二区| 欧美变态另类bdsm刘玥| 看免费成人av毛片| 免费观看在线日韩| 亚洲精品,欧美精品| av在线观看视频网站免费| 久久99热这里只有精品18| 在线观看国产h片| 最近中文字幕高清免费大全6| 亚洲aⅴ乱码一区二区在线播放| videossex国产| 国产在视频线精品| 在线 av 中文字幕| 日本黄色片子视频| 别揉我奶头 嗯啊视频| 老女人水多毛片| 少妇人妻精品综合一区二区| 男人和女人高潮做爰伦理| 51国产日韩欧美| 女的被弄到高潮叫床怎么办| 中文字幕久久专区| 网址你懂的国产日韩在线| 国语对白做爰xxxⅹ性视频网站| 久久影院123| 精品久久久久久久久av| 中国国产av一级| 日日啪夜夜撸| 国产免费视频播放在线视频| 97在线视频观看| 一级毛片久久久久久久久女| 亚洲精品影视一区二区三区av| 久久久色成人| 少妇 在线观看| 精品久久久久久久人妻蜜臀av| 三级经典国产精品| 成人毛片a级毛片在线播放| 1000部很黄的大片| 日本与韩国留学比较| 搡女人真爽免费视频火全软件| 麻豆国产97在线/欧美| 欧美日韩国产mv在线观看视频 | 高清毛片免费看| 亚洲三级黄色毛片| 伊人久久精品亚洲午夜| 日本黄大片高清| 深夜a级毛片| 又粗又硬又长又爽又黄的视频| 青青草视频在线视频观看| 亚洲综合精品二区| 中文乱码字字幕精品一区二区三区| 狂野欧美白嫩少妇大欣赏| 久久久久久久国产电影| a级一级毛片免费在线观看| 中国美白少妇内射xxxbb| 国产精品福利在线免费观看| 亚洲婷婷狠狠爱综合网| 99热这里只有是精品50| 日日啪夜夜撸| 亚洲精品影视一区二区三区av| 涩涩av久久男人的天堂| 在线观看av片永久免费下载| 在线观看国产h片| 免费看日本二区| 亚洲国产日韩一区二区| 国产一区亚洲一区在线观看| 亚洲精品成人av观看孕妇| 精品久久久久久久人妻蜜臀av| 免费高清在线观看视频在线观看| 亚洲av一区综合| 在线 av 中文字幕| 久久精品夜色国产| 国产v大片淫在线免费观看| 亚洲人成网站高清观看| 尾随美女入室| 亚洲av日韩在线播放| 九色成人免费人妻av| 少妇熟女欧美另类| 国产高清不卡午夜福利| 97在线视频观看| 韩国高清视频一区二区三区| 亚洲成人av在线免费| 各种免费的搞黄视频| 在线免费十八禁| 国产又色又爽无遮挡免| 亚洲欧美成人综合另类久久久| 国产在视频线精品| 色5月婷婷丁香| 日韩中字成人| 中文乱码字字幕精品一区二区三区| 赤兔流量卡办理| 亚洲精品日韩在线中文字幕| 一个人观看的视频www高清免费观看| 久久精品国产鲁丝片午夜精品| 黄色配什么色好看| 只有这里有精品99| 欧美bdsm另类| 久久久国产一区二区| 一二三四中文在线观看免费高清| 婷婷色综合www| 国产v大片淫在线免费观看| 80岁老熟妇乱子伦牲交| 欧美三级亚洲精品| 在线观看一区二区三区| 国产精品精品国产色婷婷| 下体分泌物呈黄色| 久久精品国产亚洲av天美| 色5月婷婷丁香| 亚洲av欧美aⅴ国产| 国产精品一及| 欧美zozozo另类| 日本黄色片子视频| 小蜜桃在线观看免费完整版高清| 国产av码专区亚洲av| av国产免费在线观看| av一本久久久久| 亚洲精品日本国产第一区| 中文在线观看免费www的网站| 看免费成人av毛片| 欧美亚洲 丝袜 人妻 在线| 又粗又硬又长又爽又黄的视频| 能在线免费看毛片的网站| 欧美成人精品欧美一级黄| 熟女av电影| 91午夜精品亚洲一区二区三区| 亚洲国产欧美在线一区| videossex国产| 国产欧美日韩一区二区三区在线 | 男女边摸边吃奶| 国产亚洲91精品色在线| 久久午夜福利片| 亚洲国产成人一精品久久久| 国产成人一区二区在线| 日韩av在线免费看完整版不卡| av又黄又爽大尺度在线免费看| 美女cb高潮喷水在线观看| 超碰97精品在线观看| 美女被艹到高潮喷水动态| 成年女人看的毛片在线观看| 少妇被粗大猛烈的视频| av在线天堂中文字幕| 久久久久国产精品人妻一区二区| 国产高清三级在线| h日本视频在线播放| av免费观看日本| 国产精品女同一区二区软件| 免费在线观看成人毛片| 一级爰片在线观看| 欧美区成人在线视频| 久久久成人免费电影| 在线观看免费高清a一片| 亚洲精品成人av观看孕妇| 欧美潮喷喷水| 成人毛片60女人毛片免费| 日韩三级伦理在线观看| 亚洲精品国产av成人精品| 尤物成人国产欧美一区二区三区| 五月开心婷婷网| 3wmmmm亚洲av在线观看| 国产av国产精品国产| 嘟嘟电影网在线观看| 中国美白少妇内射xxxbb| 国产黄色免费在线视频| 男女边吃奶边做爰视频| 人妻少妇偷人精品九色| 欧美少妇被猛烈插入视频| 国语对白做爰xxxⅹ性视频网站| 九九爱精品视频在线观看| 大香蕉久久网| 久久精品国产自在天天线| 久久99热这里只频精品6学生| 亚洲精品中文字幕在线视频 | 亚洲精品色激情综合| 日韩免费高清中文字幕av| 精品人妻一区二区三区麻豆| 国产精品一区二区在线观看99| 精品国产乱码久久久久久小说| 国产黄片视频在线免费观看| 男人狂女人下面高潮的视频| 国产精品人妻久久久久久| 男女边摸边吃奶| 国国产精品蜜臀av免费| 亚洲欧美中文字幕日韩二区| 亚洲丝袜综合中文字幕| 国产高潮美女av| 亚洲自偷自拍三级| 在线观看免费高清a一片| 久久精品国产a三级三级三级| 在线精品无人区一区二区三 | 草草在线视频免费看| 亚洲aⅴ乱码一区二区在线播放| 女的被弄到高潮叫床怎么办| 色综合色国产| 欧美日韩视频精品一区| 嫩草影院精品99| 国产视频内射| 特级一级黄色大片| 欧美日韩精品成人综合77777| 久久影院123| 久久精品久久久久久久性| 亚洲无线观看免费| 中文欧美无线码| 国产黄片视频在线免费观看| 欧美日韩亚洲高清精品| 伦理电影大哥的女人| av在线观看视频网站免费| 狂野欧美激情性xxxx在线观看| av女优亚洲男人天堂| 青春草视频在线免费观看| 国内少妇人妻偷人精品xxx网站| 国产黄a三级三级三级人| 国产精品一区www在线观看| 看黄色毛片网站| 国产黄色免费在线视频| 久久影院123| 成人二区视频| 九草在线视频观看| 国产精品秋霞免费鲁丝片| 好男人视频免费观看在线| 久久久a久久爽久久v久久| 熟女电影av网| 久久人人爽人人爽人人片va| 熟女人妻精品中文字幕| 亚洲精华国产精华液的使用体验| 日本与韩国留学比较| 国产黄片视频在线免费观看| 九九爱精品视频在线观看| 欧美区成人在线视频| 五月玫瑰六月丁香| 日韩 亚洲 欧美在线| 欧美老熟妇乱子伦牲交| 国产 一区精品| 国精品久久久久久国模美| 成年av动漫网址| 国产有黄有色有爽视频| 国产国拍精品亚洲av在线观看| 国产成人aa在线观看| 成人午夜精彩视频在线观看| 欧美区成人在线视频| 各种免费的搞黄视频| 国产片特级美女逼逼视频| 人妻 亚洲 视频| 欧美亚洲 丝袜 人妻 在线| 免费观看无遮挡的男女| 欧美人与善性xxx| 男女边吃奶边做爰视频| 国产色爽女视频免费观看| 欧美bdsm另类| 91精品国产九色| 日韩av不卡免费在线播放| 禁无遮挡网站| 人人妻人人澡人人爽人人夜夜| 深爱激情五月婷婷| 国产精品国产av在线观看| 日韩大片免费观看网站| 日日啪夜夜爽| 日本午夜av视频| 亚洲精品成人av观看孕妇| av在线蜜桃| 午夜老司机福利剧场| 国产一区二区三区综合在线观看 | 成年免费大片在线观看| 午夜福利在线在线| 好男人在线观看高清免费视频| 久久女婷五月综合色啪小说 | kizo精华| 97在线视频观看| 一级爰片在线观看| 99热网站在线观看| 又爽又黄a免费视频| eeuss影院久久| 久久99热6这里只有精品| 国产永久视频网站| av女优亚洲男人天堂| 全区人妻精品视频| 插阴视频在线观看视频| 九九在线视频观看精品| 天天躁日日操中文字幕| www.av在线官网国产| 18禁在线播放成人免费| 91狼人影院| 精品一区在线观看国产| 赤兔流量卡办理| 一边亲一边摸免费视频| 男人添女人高潮全过程视频| 2018国产大陆天天弄谢| 成人欧美大片| 久久精品综合一区二区三区| 国产欧美日韩精品一区二区| 一本色道久久久久久精品综合| 成年免费大片在线观看| 色网站视频免费| 有码 亚洲区| 国产精品国产三级国产专区5o| 国产欧美亚洲国产| 99热国产这里只有精品6| 春色校园在线视频观看| 人妻一区二区av| 成人特级av手机在线观看| 青春草视频在线免费观看| 日韩三级伦理在线观看| 国产精品蜜桃在线观看| 日本-黄色视频高清免费观看| 狂野欧美激情性xxxx在线观看| 欧美日韩亚洲高清精品| 亚洲欧美精品自产自拍| 我要看日韩黄色一级片| 日本三级黄在线观看| 国产伦精品一区二区三区视频9| 18禁在线播放成人免费| 内地一区二区视频在线| 国产女主播在线喷水免费视频网站| 日韩成人av中文字幕在线观看| 亚洲天堂国产精品一区在线| 午夜福利在线在线| videossex国产| 日韩电影二区| 亚洲精品日韩av片在线观看| 日韩欧美精品免费久久| 18+在线观看网站| 搡女人真爽免费视频火全软件| 美女cb高潮喷水在线观看| 久久亚洲国产成人精品v| 亚洲av.av天堂| 麻豆乱淫一区二区| 黄色日韩在线| 97在线视频观看| 亚洲美女搞黄在线观看| 天天躁夜夜躁狠狠久久av| 亚洲aⅴ乱码一区二区在线播放| 美女被艹到高潮喷水动态| 最新中文字幕久久久久| 人妻少妇偷人精品九色| 网址你懂的国产日韩在线| 亚洲精品国产成人久久av| 99久久人妻综合| 国产黄色免费在线视频| 国模一区二区三区四区视频| 亚洲精华国产精华液的使用体验| 久久久久久伊人网av| 韩国高清视频一区二区三区| 亚洲国产高清在线一区二区三| 超碰av人人做人人爽久久| 国产综合懂色| 国产精品偷伦视频观看了| 免费观看的影片在线观看| 麻豆成人av视频| 欧美精品国产亚洲| 中文字幕亚洲精品专区| 人妻夜夜爽99麻豆av| 91久久精品国产一区二区成人| a级一级毛片免费在线观看| 国产精品秋霞免费鲁丝片| 一级黄片播放器| 在线a可以看的网站| 狂野欧美激情性xxxx在线观看| av在线app专区| 国产一区二区三区av在线| av女优亚洲男人天堂| 99久久九九国产精品国产免费| 麻豆国产97在线/欧美| 久久久久久久久久久丰满| 国产精品国产三级专区第一集| 免费观看无遮挡的男女| 成人午夜精彩视频在线观看| 免费av毛片视频| 免费看av在线观看网站| 纵有疾风起免费观看全集完整版| 毛片一级片免费看久久久久| 亚洲精华国产精华液的使用体验| 18禁裸乳无遮挡动漫免费视频 | 亚洲av国产av综合av卡| 国产在视频线精品| 人妻制服诱惑在线中文字幕| 欧美少妇被猛烈插入视频| 涩涩av久久男人的天堂| 深夜a级毛片| 熟女人妻精品中文字幕| 欧美区成人在线视频| 嫩草影院新地址| 亚洲av中文字字幕乱码综合| 免费电影在线观看免费观看| 欧美日韩亚洲高清精品| 亚洲av国产av综合av卡| 毛片女人毛片| 大香蕉久久网| 成人漫画全彩无遮挡| 成人一区二区视频在线观看| 少妇人妻久久综合中文| 免费看av在线观看网站| 日韩人妻高清精品专区| 亚洲精品国产av成人精品| 岛国毛片在线播放| 青春草亚洲视频在线观看| 亚洲三级黄色毛片| 日日撸夜夜添| 啦啦啦啦在线视频资源| 亚洲精品aⅴ在线观看| 亚洲国产最新在线播放| 九草在线视频观看| 国产精品精品国产色婷婷| 成人欧美大片| 亚洲精品乱久久久久久| 亚洲精品乱码久久久v下载方式| 只有这里有精品99| 国产精品久久久久久精品电影小说 | 99久久精品国产国产毛片| 亚洲欧美日韩东京热| 国产高清国产精品国产三级 | 日韩国内少妇激情av| 激情 狠狠 欧美| 午夜免费观看性视频| 免费不卡的大黄色大毛片视频在线观看| 欧美高清性xxxxhd video| 亚洲自拍偷在线| 秋霞在线观看毛片| 中文天堂在线官网| 春色校园在线视频观看| 老司机影院毛片| 69av精品久久久久久| 欧美人与善性xxx| 亚洲精品日本国产第一区| kizo精华| 国国产精品蜜臀av免费| 亚洲在线观看片| 亚洲av.av天堂| 免费黄网站久久成人精品| 国产真实伦视频高清在线观看| 亚洲欧美中文字幕日韩二区| av.在线天堂| 精品久久久精品久久久| 一个人看的www免费观看视频| 在线观看国产h片| 成人欧美大片| 亚洲国产欧美在线一区| 老师上课跳d突然被开到最大视频| 男女下面进入的视频免费午夜| 亚洲精品中文字幕在线视频 | 狂野欧美激情性bbbbbb| 国产精品久久久久久久电影| 亚洲精品影视一区二区三区av| 国产探花极品一区二区| 搡老乐熟女国产| 久热这里只有精品99| 2018国产大陆天天弄谢| 午夜精品一区二区三区免费看| 美女国产视频在线观看| 蜜桃久久精品国产亚洲av| 日本午夜av视频| 一级av片app| av播播在线观看一区| 人妻系列 视频| 久久久午夜欧美精品| 好男人在线观看高清免费视频| 亚洲欧美精品自产自拍| 大香蕉97超碰在线| 国产精品久久久久久久电影| 精品久久久精品久久久| 在线a可以看的网站| videossex国产| av福利片在线观看| 久久久精品免费免费高清| 国产亚洲5aaaaa淫片| 久久久久国产精品人妻一区二区| 久久久久久九九精品二区国产| 男人爽女人下面视频在线观看| 麻豆久久精品国产亚洲av| 老司机影院成人| 永久免费av网站大全| 中文乱码字字幕精品一区二区三区| 亚洲第一区二区三区不卡| 久久国内精品自在自线图片| 美女脱内裤让男人舔精品视频| 97热精品久久久久久| 亚洲av二区三区四区| av国产久精品久网站免费入址| 欧美最新免费一区二区三区| av卡一久久| 久久久久国产网址| 国产av国产精品国产| 亚洲色图av天堂| 欧美xxxx黑人xx丫x性爽| 网址你懂的国产日韩在线| 欧美zozozo另类| 国产精品一区二区三区四区免费观看| 一区二区三区四区激情视频| 99re6热这里在线精品视频| 精品少妇久久久久久888优播| 日韩国内少妇激情av| 嫩草影院新地址| 黄色配什么色好看| 亚洲国产精品成人综合色| 三级经典国产精品| 六月丁香七月| 网址你懂的国产日韩在线| 嫩草影院入口| 老司机影院毛片| 亚洲综合精品二区| 制服丝袜香蕉在线| 国产老妇伦熟女老妇高清| 日韩欧美 国产精品| 亚洲国产精品成人久久小说| 国产女主播在线喷水免费视频网站| 男人爽女人下面视频在线观看| 欧美精品人与动牲交sv欧美| 久久久久国产精品人妻一区二区| 久久久午夜欧美精品| 久久精品久久久久久久性| 亚洲成人中文字幕在线播放| 国产v大片淫在线免费观看| 少妇被粗大猛烈的视频| 高清毛片免费看| 色吧在线观看| 国产成人a区在线观看| 国产黄a三级三级三级人| 久久久欧美国产精品| 丰满乱子伦码专区| 亚洲人成网站在线观看播放| 97在线视频观看| 国产欧美日韩精品一区二区| 国产男女内射视频| 波多野结衣巨乳人妻| 亚洲av电影在线观看一区二区三区 | 国产熟女欧美一区二区| 99久久精品国产国产毛片| 纵有疾风起免费观看全集完整版| 狂野欧美白嫩少妇大欣赏| 自拍偷自拍亚洲精品老妇| 蜜桃亚洲精品一区二区三区| 视频区图区小说| 免费黄频网站在线观看国产| 各种免费的搞黄视频| 国产欧美日韩精品一区二区| 舔av片在线| 亚洲国产日韩一区二区| 精品久久久久久久末码| av.在线天堂| 熟女人妻精品中文字幕| 免费看a级黄色片| 亚洲av不卡在线观看| 99热网站在线观看| 精品一区二区三卡| av一本久久久久| 免费看光身美女| 精品久久久久久久末码| 亚洲欧美一区二区三区黑人 | 制服丝袜香蕉在线| 国产美女午夜福利| 日韩欧美精品v在线| 亚洲精品乱码久久久v下载方式| 一本—道久久a久久精品蜜桃钙片 精品乱码久久久久久99久播 | 亚洲国产高清在线一区二区三| 男人爽女人下面视频在线观看| 婷婷色麻豆天堂久久| 欧美成人精品欧美一级黄| 菩萨蛮人人尽说江南好唐韦庄| 国产成人精品一,二区| 国产精品爽爽va在线观看网站| 人妻制服诱惑在线中文字幕| 日本一二三区视频观看| 亚洲激情五月婷婷啪啪| 蜜桃亚洲精品一区二区三区| 国产精品久久久久久精品电影| 中文字幕久久专区| 一级二级三级毛片免费看| 亚洲色图av天堂| 男人和女人高潮做爰伦理| 2022亚洲国产成人精品| 99热这里只有精品一区| 啦啦啦在线观看免费高清www| 另类亚洲欧美激情| 亚洲,一卡二卡三卡| 一级毛片黄色毛片免费观看视频| 欧美xxxx性猛交bbbb| 亚洲精品成人久久久久久| 真实男女啪啪啪动态图| 91久久精品国产一区二区三区| 搞女人的毛片| 美女内射精品一级片tv| 91久久精品电影网| 成年免费大片在线观看| 日韩制服骚丝袜av|