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张玉虎 M.Oshima T.Morikawa T.Hayakawa Y.Toh 周小红 何建军 刘忠 甘再国 T.Shizuma M.Koizumi A.Osa J.Katakura Y.Hatsukawa M.Matsuda< sup 《中国物理 C》2003,27(4):313-318
利用重离子熔合蒸发反应和在束γ谱学实验方法研究了双奇核176,178Ir和182Au的高自旋态结构,在这3个双奇核中观测到了基于πi13/2 νi13/2准粒子组态下的转动带.以能级间隔系统学为判据,对184Au核中πi13/2 νi13/2转动带能级自旋进行了指定.指出176,178Ir和182,184Au 4个双奇核的πi13/2 νi13/2转动带在低自旋区均出现旋称反转.对πi13/2 νi13/2转动带旋称反转现象进行了定性的讨论.用推转壳模型对πh9/2 νi13/2带和πi13/2 νi13/2带能级结构进行了理论研究,发现当采用形变和对力自洽计算后,从理论上可以定性地解释两个半退耦带出现的旋称反转现象. 相似文献
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在以前工作的基础上,计算了飞行 K-奇异交换反应9Be(K-,π-)A9Be 和13C(K-,π-)A13C 的角分布.在平面波冲量近似下,计算了协同产生反应到达超核 A9Be、A13C 的奇异相似态和超对称态的微分截面的相对比,并且估算了这些微分截面绝对值.根据这些计算,讨论了通过奇异交换反应和协同产生反应产生超对称态的可能性. 相似文献
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本文用MIT口袋模型和波包方法计算了π0→2γ过程的宽度. 计算发现mπ→0是一个好的近似. MIT口袋模型给出, Γ(π0→2γ)∝m3π/F2π, 这种形式与Adler的结果相符合, 但数字结果显示, Γ(π0→2γ)的理论值是实验值的2.7倍, 这个差主要来自Fπ的理论值与实验值的差. 而这个差很强地依赖于MIT口袋模型的方程和边界条件, 从而对MIT口袋模型构成了一个检验. 相似文献
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在海拔3220米的实验室里,用磁谱仪动量予选装置和多板云室,对落在0.23m2面积上的单根荷电强子进行了观测.考虑到各种可能的修正以后,得出在10—20 GeV/c之间,荷电强子的负正比为:N-/N+=0.53±0.05.当认为N+只包含有P和π+,N-是π-,而且Nπ+/Nπ-=1时,推算出Nπ-/Np=0.9±0.1.若π-积分谱的形式为j(>p)=Kp-r,估算出在5—20 GeV/c的动量范围,r(?)2.3.本文也对荷电强子的积分流强作了粗略的估计,其结果是:j⊥p+π(>12 GeV/c)=(7.4±0.7)×10-5cm-2·st-1·s-1. 相似文献
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We have measured the cross section for π+π- production in two-photon collisions using a data sample with an integrated luminosity of 85.9fb-1 collected with the Belle detector. The f0(980) resonance is observed as a peak in the energy spectrum of the cross section. We also report preliminary results for γγ→π0π0 with two-photon center-of-mass energies ranging from 0.6 to 4.0GeV, based on a 95fb-1 data sample. We find at least four resonant structures including a peak from f0(980). In addition, there is evidence for χc0 production. We also make a preliminary discussion of the angular dependence and cross section ratio of γγ→π+π- and γγ→π0π0. 相似文献
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In this paper, we calculate the production of a charged top pion in association with a W boson via gg fusion at CERN's Large Hadron Collider in the context of the topcolor assisted technicolor model. We find that the total cross section of pp → gg → W±πt is several dozen femtobarns with reasonable values of the parameters, and the total cross section of pp → W±πt can reach a few hundred femtobarns when we consider the sum of the contributions of these two parton subprocesses, gg → W±πt and bb → W±πt. 相似文献
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本文应用复合粒子量子场论的微扰展开式和相对论性的(π&;#177;μ?)、(K&;#177;μ?)的B.S.波函数,计算了在原子核屏蔽库仑场中高能(π&;#177;μ?)、(K&;#177;μ?)原子的裂解能谱和截面。在极端相对论近似下,对大多数原子核,它们的裂解截面分别约为10-18cm2和10-17cm2。利用同样的波函数,还计算了(π&;#177;μ?)→π0+vμ(vμ),(K&;#177;μ?)→K0+vμ(vμ),以及(π&;#177;μ?)→μ++μ-+vμ(vμ),(K&;#177;μ?)→μ++μ-+vμ(vμ)的衰变几率。 相似文献
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本文用π核散射的微观描述,计算了Tπlab=240、343MeV时π+-16O弹性散射微分截面,定性地符合实验。 相似文献
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We reported the observation of Y(2175) in φ f0(980) mass spectrum in J/ψ→η π f0(980) with f0(980)→π+π- and the observation of a broad 1- resonance of K+ 相似文献
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我们构造了一手征对称的π去MIT-袋模型. 求出球对称的π场经典解, 重新计算了强子袋质量谱. 计算了Δ++(1236)的衰变宽度和P33πN相移δ33, 与实验符合得很好. 相似文献
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We investigate the D0-D0 mixing through the doubly Cabibbo suppressed (DCS) channel D0→f0(980)K*0 and its charge conjugate channel, in which the K*0 meson is reconstructed in both K+π- and KSπ0 final state. Although the decay D0→f0(980)K* has a small branching ratio, the final state mesons are relatively easy to identify. The f0(980) meson can be replaced by the S-wave π+π- state, or a longitudinally polarized vector meson ρ0. All mixing parameters, including the mass difference and decay width difference, can be extracted by studying the time-dependent decay width of these channels. We show that the method is valid in all regions for mixing parameters and it does not depend on the strong phase difference. 相似文献
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