双奇核170Ta的转动带结构

用能量为105MeV的¹⁶O束流,通过¹⁵⁹Tb(¹⁶O,5nγ)¹⁷⁰Ta反应研究了¹⁷⁰Ta的高自旋态,观察到¹⁷⁰Ta的3个转动带,其中一个耦合带和一个半退耦带中的非优先ΔI=2转动系列是由本工作发现的.文中还讨论了这些转动带可能的准粒子组态.     

双奇核中π1/2－[541]⊙νi13/2带的系统学特征

通过束流能量为97MeV的¹⁵²Sm(¹⁹F,5n)¹⁶⁶Lu熔合蒸发反应,用在束γ(谱学方法研究了¹⁶⁶的高自旋态,建立了5条转动带,其中3条带是本实验中首次确定的.发现了π1/2^－[541]⊙ν5/2⁺[642]带的低自旋旋称反转现象,该带的反转点自旋值17.5h同A=170区奇奇核的π1/2^－[541]⊙νi_13/2带的反转点变化趋势非常相符.     

质量数在160-180核区形变双奇核高自旋态实验研究

基于在160-180核区形变双奇核高自旋态研究中所取得的研究结果和最近几年陆续发表的双奇核高自旋态核谱学数据,系统地考察和研究了πh_11/2⊙νi_13/2强耦合带和πh_9/2⊙νi_13/2半退耦带旋称反转的特征和规律.指出^182,184Au核素的πh_13/2⊙νi_13/2半退耦带也可能出现旋称反转;有限的实验数据似乎支持这一观点.首次在双奇核^178,180Ir的πh_11/2⊙νi_13/2强耦合带中发现了低转频下的逐渐顺排现象;在¹⁷⁸Ir核中发现了回弯频率反常超前.这些反常现象可能与核形变(或中子对力)的组态依赖性有关.     

80Rb的旋称劈裂反转及负宇称带的回弯

通过熔合蒸发反应⁶⁵Cu+¹⁹F,⁶⁶Zn+¹⁸O及⁶⁸Zn+¹⁶O,在3种入射束流的能量分别为75MeV,76MeV及80MeV研究了⁸⁰Rb高自旋态的能级结构.增加了20多条新的γ跃迁,在已知负宇称转晕带上建立了两条新的边带.将原有的第二条负宇称带的自旋态从12^－推高到了22^－,并首次观察到这个带的回弯,它的回弯频率为0.49MeV;负宇称转晕带在15^－时出现了旋称反转,第二负宇称带存在明显的旋称劈裂,但没有观察到旋称反转,这两条负宇称带的结构均与其同中子数核⁸²Y非常相似.     

162Lu的高自旋态及A=160区双奇核晕态能级的符号因子反转

利用¹⁴⁷Sm(¹⁹F,4nγ)¹⁶²Lu反应研究了¹⁶²Lu的高自旋态. 由7个带BGO康普顿抑制的高纯锗探测器和一个小平面探测器进行了在束γ测量,首次建立了双奇核¹⁶²Lu转晕带的能级纲图. 发现在低转动频率下,¹⁶²Lu的转晕带能级发生符号因子反转. 对质量数A=160核区双音核的转晕带重新进行了分析和考察,讨论了转晕带能级符号因子反转的系统性.     

形变双奇核178Ir转动带能级的旋称反转

利用¹⁵²Sm(³¹P,5nγ)¹⁷⁸Ir反应产生并研究了双奇核¹⁷⁸Ir的高自旋态.实验中进行了¹⁷⁸Ir核的在束γ测量,包括γ射线的激发函数测量、X–γ和γ–γ符合测量.首次建立了双奇核¹⁷⁸Ir基于πh_9/2νi_13/2和πh_11/2νi_13/2准粒子组态上的转动带能级纲图.发现在低自旋区,两个转动带能级均出现旋称反转.对此核区半退耦带的旋称反转作了简要的分析和讨论.     

弱形变双奇核158Tm中的旋称反转

通过融合蒸发反应¹⁴⁴Nd(¹⁹F,5n)布居了双奇核¹⁵⁸Tm的高自旋态. 扩展了原来已知的带结构, 并建立了一条新转动带. 通过与相邻核的比较, 讨论¹⁵⁸Tm核中两条四准粒子带的内禀组态, 并分别指定为πh_11/2\otimes νh_9/2(α=+1/2)\otimes (νi_13/2)²和πh_11/2\otimes νh_9/2(α=－1/2)\otimes (νi_13/2)² 组态. 建立在πh_11/2\otimes νi_13/2组态上的转动带被观测到呈现持续旋称反转现象, 而前述的两条高自旋区的 四准粒子转动带也呈旋称反转. 对这两种类型的旋称反转现象的可能机制进行了简单而定性的讨论.     

158Tm核中的带结构及电磁跃迁性质

通过融合蒸发反应¹⁴⁴Nd(¹⁹F,5n)E=108, 112MeV对双奇核¹⁵⁸Tm的高自旋态进行了研究. 扩展了原已建立的带结构, 并建立了2条新转动带. 获得了γ射线的相对强度和耦合带的B(M1)/B(E2)比值.观测到了πh_11/2⊙νi_13/2组态带的旋称反转点. 对新建立的转动带进行了自旋-宇称以及组态的讨论.     

A～80区奇——奇核的旋称反转

为了理解奇-奇Rb核正宇称晕带旋称反转的微观起源, 作为一个例子, 用投影壳模型(PSM)计算了核⁸²Rb的能谱. 可以看出计算结果能重现主要的特征. 这个分析清楚地显示只要考虑γ形变随着自旋增加而变化, 旋称劈裂特别是旋称反转就能再现.     

188TL的πh9/2×υi13/2扁椭球转动带的旋称反转研究

利用能量为170MeV的³⁵Cl束流, 通过¹⁵⁷Gd(³⁵Cl,4n)熔合蒸发反应研究了¹⁸⁸Tl的 高自旋态能级结构. 依据实验结果建立了¹⁸⁸Tl基于πh_9/2×υi_13/2组态的转动带. 根据双奇Tl核能级结构的相似性, 指定了¹⁸⁸Tlπh_9/2×υi_13/2扁椭球转动带的自旋值. 结果表明在¹⁸⁸Tl中, πh_9/2×υi_13/2扁椭球转动带在低自旋区具有旋称反转性质. 利用包含了质子-中子剩余相互作用的准粒子-转子模型, 定性地解释了πh_9/2×υi_13/2扁椭球转动带的低自旋区旋称反转现象.     

On Odd Laplace Operators

We consider odd Laplace operators acting on densities of various weights on an odd Poisson (= Schouten) manifold M. We prove that the case of densities of weight 1/2 (half-densities) is distinguished by the existence of a unique odd Laplace operator depending only on a point of an 'orbit space' of volume forms. This includes earlier results for the odd symplectic case, where there is a canonical odd Laplacian on half-densities. The space of volume forms on M is partitioned into orbits by the action of a natural groupoid whose arrows correspond to the solutions of the quantum Batalin–Vilkovisky equations. We compare this situation with that of Riemannian and even Poisson manifolds. In particular, we show that the square of an odd Laplace operator is a Poisson vector field defining an analog of Weinstein's 'modular class'.     

偶奇q相干态的振幅立方压缩性质

研究结果表明,偶q相干态呈现振幅立方压缩性质;奇q相干态不呈现振幅立方压缩性质。     

奇偶q相干态的高阶反聚束效应

本文研究了奇偶q相干态的高阶反聚束效应,结果表明,当参数q和r²在一定范围内取值时,奇偶q相干态都能呈现出高阶反聚束效应(N≥2),而且2n+1阶的反聚束效应和2n阶的反聚束效应相同。     

High-spin states in 128I

The high-spin states in 128I have been studied by using in-beam γ-ray spectroscopy with the 124Sn(7Li,3n)128I reaction at beam energies of 25, 28 and 42 MeV. A new level scheme including 20 new levels and 27 new γ-transitions for 128I has been established preliminarily.     

Continuous-variable quantum teleportation of even and odd coherent states through varied gain channels

This paper has investigated quantum teleportation of even and odd coherent states in terms of the EPR entanglement states for continuous variables. It discusses the relationship between the fidelity and the entanglement of EPR states, which is characterized by the degree of squeezing and the gain of classical channels. It shows that the quality of teleporting quantum states also depends on the characteristics of the states themselves. The properties of teleporting even and odd coherent states at different intensities are investigated. The difference of teleporting two such kinds of quantum states are analysed based on the quantum distance function.     

几类宏观量子态的内部结构及其压缩特性

谐振子,变形振子,非简谐振子以及变形非简谐振子湮没算符高次幂的正交归一本征态都具有奇偶结构形式.正是由于这种结构特点决定了它们振幅的高次幂压缩性质.     

压缩奇偶相干态的量子统计性质

用压缩算子作用在奇偶相干态上即可得到压缩奇偶相干态.本文研究了这类量子态的统计特性.结果表明,压缩奇相干态和压缩偶相干态都能处于压缩状态,它们的光子亦都可能出现反聚束的现象.     

Quantum Pairing Time Orders

The concept of the time-independent correlators for the even- and odd-frequency pairing states that can be defined for both bosonic and fermionic quasiparticles is proposed. These correlators explicitly capture the existence of two distinct classes of pairing states and provide a direct probe of the hidden Berezinskii order. This concept is illustrated in the cases of pairings for Majorana fermions and quasiparticles in Dirac semimetals. It is shown that the time-independent correlator is able to effectively capture the energy scale relevant for pairing.     

囚陷离子奇偶相干态的产生以及梳形崩塌与复苏现象

首先考虑囚禁在谐振子势中的二能级离子在Ｌａｍｂ－Ｄｉｃｋ级限下与驻波场的相互作用利用态选择测量来产生囚陷离卫的奇偶相干态。然后研究原子反转随时间的演化，发现其在一定条件下表现为梳形崩塌与复苏现象。     

Quantum Properties of Two-Mode Squeezed Even and Odd Coherent States

Two new types of quantum states are constructed by applying the operator s(ξ) = exp(ξ*ab - ξa b ) on the two-mode even and odd coherent states.The mathematical and quantum statistical properties of such states are investigated.Various nonclassical features of these states,such as squeezing properties,the inter-mode photon bunching,and the violation of Cauchy-Schwarz inequality,are discussed.The Wigner function in these states are studied in detail.