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Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra

机译:α-粒子发射作为质子蒸发光谱中核形状和结构效应的探针

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摘要

Emission barriers and subbarrier anisotropies from [alpha] decay of Sn* and Yb* compound nuclei are examined in the light of calculations incorporating deformation effects in the decay process. For the Yb* systems deformation which increases with spin is necessary to explain the data. For the Sn* systems the spectral shapes and anisotropies can be explained without deformation. For systems lighter than Sn this probe is not sensitive to the deformation. Energy spectra and angular correlations of evaporated protons from the 52Cr(34S, 2n2p)82Sr reaction were measured in coincidence with discrete transitions. Large shifts in proton spectra were observed when high spin states in different rotational bands are populated. They are interpreted as due to near-yrast stretched proton emission preferentially populating the yrast band by subbarrier protons. Simulations show that channel selected proton spectra cannot be used as probes of deformation.
机译:根据在衰变过程中包含变形效应的计算,检查Sn *和Yb *复合核的α和Yb *复合核的发射屏障和副载体各向异性。对于YB *系统,可以使用旋转增加的系统来解释数据。对于SN *系统,可以在不变形的情况下解释光谱形状和各向同性。对于比SN轻的系统,该探针对变形不敏感。通过离散的转变重合测量来自52CR(34S,2N2P)82SR反应的蒸发质子的能谱和角度相关性。当填充不同旋转带中的高旋转状态时,观察到质子光谱中的大移位。它们被解释为由于近yrast拉伸质子发射优先填充副载体质子的YRAST带。模拟表明,频道所选的质子光谱不能用作变形探针。

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