arXiv 1404.37582014-04-14nucl-ex

在MeV = E/A =10的条件下，78 Kr和40 Ca核融合后瞬发冲击诱导Fission的新反应机制的证据

Evidence for a Novel Reaction Mechanism of a Prompt Shock-Induced Fission Following the Fusion of 78Kr and 40Ca Nuclei at E/A =10 MeV

E. Henry, J. Toke, S. Nyibule, M. Quinlan, W. U. Schroder, G. Ademard, F. Amorini, L. Auditore, C. Beck, I. Berceanu, E. Bonnet, B. Borderie, G. Cardella, A. Ch… 展开作者

E. Henry, J. Toke, S. Nyibule, M. Quinlan, W. U. Schroder, G. Ademard, F. Amorini, L. Auditore, C. Beck, I. Berceanu, E. Bonnet, B. Borderie, G. Cardella, A. Chbihi, M. Colonna, E. De Filippo, A. DOnofrio, J. D. Frankland, E. Geraci, E. La Guidara, M. La Commara, G. Lanzalone, P. Lautesse, D. Lebhertz, N. Le Neindre, I. Lombardo, D. Loria, K. Mazurek, A. Pagano, M. Papa, E. Piasecki, S. Pirrone, G. Politi, F. Porto, F. Rizzo, E. Rosato, P. Rusotto, G. Spadaccini, A. Trifiro, M. Trimarchi, G. Verde, M. Vigilante, J. P. Wieleczko

备注：: 5 PAGES, 6 FIGURES

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摘要：

对10 AMeV ~（78）Kr +~（40）Ca反应的逆运动学ISODEC实验数据进行了分析，揭示了一种迄今未知的反应机制，它介于经典阻尼二体碰撞和聚变-裂变之间，但与文献中所称的快裂变或准裂变有很大不同。这些特征表明，系统瞬时融合，同时几乎平衡质量不对称性和能量，但仍保持部分能量存储在集体冲击传递和可能的角动量轴承形式的激励中。随后，系统沿着碰撞或激波轴动态裂变，出现的碎片具有以对称裂变为中心的宽质量谱，沿着裂变轴的相对速度略高于横向，并且几乎没有内在自旋。这类质量不对称的裂变事件显示出明显的倾向性，即更大质量的碎片沿着束流方向前进，这一特征使人想起早先报告的单独的类似弹丸的碎片的动态碎裂，并指向初始质量和速度分布的记忆。

英文摘要：

An analysis of experimental data from the inverse-kinematics ISODEC experiment on 78Kr+40Ca reaction at a bombarding energy of 10 AMeV has revealed signatures of a hitherto unknown reaction mechanism, intermediate between the classical damped binary collisions and fusion-fission, but also substantially different from what is being termed in the literature as fast fission or quasi fission. These signatures point to a scenario where the system fuses transiently while virtually equilibrating mass asymmetry and energy and, yet, keeping part of the energy stored in a collective shock-imparted and, possibly, angular momentum bearing form of excitation. Subsequently the system fissions dynamically along the collision or shock axis with the emerging fragments featuring a broad mass spectrum centered around symmetric fission, relative velocities somewhat higher along the fission axis than in transverse direction, and virtually no intrinsic spin. The class of massasymmetric fission events shows a distinct preference for the more massive fragments to proceed along the beam direction, a characteristic reminiscent of that reported earlier for dynamic fragmentation of projectile-like fragments alone and pointing to the memory of the initial mass and velocity distribution.

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