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Multiphonon mixed-symmetry states accessible to the shell model

机译:壳模型可访问的多声子混合对称状态

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The J(pi) = 2(+) one-phonon and 1(+), 3(+) two-phonon mixed-symmetry states were observed in the near-spherical nucleus Mo-94 by means of gamma-ray spectroscopy using electromagnetic, weak and strong population mechanisms in photon scattering, beta-decay and light-ion fusion evaporation reactions, respectively. We measured level energies, spin and parity quantum numbers, branching ratios, multipole mixing ratios and lifetimes for some low-spin states above the yrast line. The extracted B(M1) and B(E2) values enabled us to identify mixed-symmetry states. A shell model calculation using the Surface Delta Interaction accounts well for the low-spin level scheme of Mo-94 and for the measured transition strengths. The shell model supports the mixed-symmetry interpretation of the interacting boson model for the observed multiphonon structure. [References: 21]
机译:通过使用电磁波的伽马射线光谱法,在近球形原子Mo-94中观察到了J(pi)= 2(+)一声子和1(+),3(+)两声子的混合对称状态。 ,分别在光子散射,β衰变和光离子聚变蒸发反应中的弱和强种群机制。我们测量了在yrast线以上的一些低自旋态的能级,自旋和奇偶校验量子数,支化比,多极混合比和寿命。提取的B(M1)和B(E2)值使我们能够识别混合对称状态。使用Surface Delta Interaction进行的壳模型计算很好地说明了Mo-94的低旋水平方案和测得的跃迁强度。壳模型支持观察到的多声子结构相互作用玻色子模型的混合对称解释。 [参考:21]

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