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Hg* and 
Pt* nuclei at intermediate excitation energiesKozulin, E. M.*; Knyazheva, G. N.*; Itkis, I. M.*; Itkis, M. G.*; Mukhamejanov, Y. S.*; Bogachev, A. A.*; Novikov, K. V.*; Kirakosyan, V. V.*; Kumar, D.*; Banerjee, T.*; et al.
Physical Review C, 105(1), p.014607_1 - 014607_12, 2022/01
被引用回数：14 パーセンタイル：97.15(Physics, Nuclear)Asymmetric fission in the neutron-deficient Hg region was first observed about 10 years ago at ISOLDE, and caused a revision of the current understanding of fission in this region. In this work, the fission of Hg and Pd were studied using the time-of-flight spectrometer CORSET at the Flerov Laboratory in Dubna. The observed fission fragments mass distributions of the different isotopes suggest the presence of four concurrent fission modes, one symmetric and three asymmetric fission modes. The asymmetric modes differ in the total kinetic energies and fragment mass splits. These results point out the existence of a well deformed proton shell at 
=36 and a less deformed proton shell at =46.
Hg and 
Pb formed in the reactions with 
Ar and 
Ca ionsBogachev, A. A.*; Kozulin, E. M.*; Knyazheva, G. N.*; Itkis, I. M.*; Itkis, M. G.*; Novikov, K. V.*; Kumar, D.*; Banerjee, T.*; Diatlov, I. N.*; Cheralu, M.*; et al.
Physical Review C, 104(2), p.024623_1 - 024623_11, 2021/08
被引用回数：18 パーセンタイル：94.84(Physics, Nuclear)Hg及びPb核の非対称及び対称核分裂モードの研究のため、Ar + 
Sm,
Ca + 
Sm反応で生成したHg及び
Pbの質量-エネルギー分布の測定を行った。クーロン障壁エネルギー近傍のエネルギーにおいて、質量-エネルギー分布は二重アーム飛行時間型スペクトロメータCORSETを用いて測定し、以前に測定した
Pb同位体と比較した。結論として、HgとPb核の非対称核分裂の研究特性はZ
36では変形した陽子殻の存在を、Z46では変形しない陽子殻の存在を指摘した。
小島 誠治*; Novikov, V. N.*; 古府 麻衣子; 山室 修*
Physica Status Solidi (B), 257(11), p.2000073_1 - 2000073_6, 2020/11
被引用回数：3 パーセンタイル：19.14(Physics, Condensed Matter)The network structure of borate glass is remarkably modified by the addition of alkali metals. The alkali metal dependences of the first sharp diffraction peak (FSDP) and the boson peak (BP) are investigated in alkali borate glasses by elastic and inelastic neutron scattering experiments. With an increase in ionic radius of alkali ions, both the width 
of FSDP and the BP energy decrease. The comparison of the characteristic length of medium-range order (MRO) predicted by the FSDP and the position of the BP allows us to find the mean-square fluctuations of the transverse sound velocity within series of alkali borate glasses. It is shown that the fragility of the respective alkali borate melts inversely correlates with the mean-square fluctuations of the transverse sound velocity in glassy state.
小島 誠治*; Novikov, V. N.*; 古府 麻衣子; 山室 修*
Journal of Non-Crystalline Solids, 518, p.18 - 23, 2019/08
被引用回数：6 パーセンタイル：29.4(Materials Science, Ceramics)This paper reports the variation in the first sharp diffraction peak (FSDP) and the boson peak (BP) of lithium and cesium borate glasses xM
O-(1-x)BO
(M = Li, Cs, x = 0.08, 0.14, 0.22) investigated by elastic and inelastic neutron scattering. The different content dependences between lithium and cesium borate glasses are discussed based on the different modifications of the boron-oxide network structure by the small Li and large Cs ions. The static characteristic correlation lengths R
were determined from the width of the FSDP of the static structure factor 
. The dynamic characteristic correlation lengths R
were determined from the BP energy of the dynamic structure factor 
. They are close in absolute value (about 2 nm). With increasing x, R increases, while R gradually decreases with the different rate in the lithium and cesium glasses. However, their ratio, R/R increases with the content of the metal in both the lithium and cesium glasses at the same rate. The decrease in the amplitude of elastic fluctuations with the increasing x due to the increase in fragility with the increasing x might restore the correlation between R and R in the lithium borate glasses, and this tendency may be the same for the cesium borate glasses.
