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首页> 外文期刊>Physics of atomic nuclei >Coherent fragmentation of C-12 nuclei of momentum 4.5 GeV/c per nucleon through the Be-8(g.s.)+He-4 channel in a nuclear photoemulsion containing lead nuclei
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Coherent fragmentation of C-12 nuclei of momentum 4.5 GeV/c per nucleon through the Be-8(g.s.)+He-4 channel in a nuclear photoemulsion containing lead nuclei

机译：通过BE-8（G.S.）核心乳液中的核爆炸核爆炸中的每核电4.5μg/ c的一动核电片的C-12核的相干碎片。

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摘要

A two-particle channel in which an unbound nucleus of Be-8 in the ground state (Be-8(g.s.)) was one of the fragments was selected among events where C-12 nuclei of momentum 4.5 GeV/c per nucleon undergo coherent dissociation into three alpha particles. The events in question were detected in a track nuclear photoemulsion containing lead nuclei, which was irradiated at the synchrophasotron of the Laboratory of High Energies at the Joint Institute for Nuclear Research (JINR, Dubna). The average transverse momentum of alpha particles produced upon the decay of Be-8(g.s.) nuclei was 87 +/- 6 MeV/c, while that for "single" alpha (alpha(s)) particles was 123 +/- 15 MeV/c. The average value of the transverse-momentum transfer in the reaction being considered, Pt(12C), was 223 +/- 20 MeV/c. The average value of the cross section for this channel involving Ag and Br target nuclei was 13 +/- 4 mb, while the cross section for the reaction on the Pb nucleus was 40 +/- 15 mb. The Coulomb dissociation contribution evaluated on the basis of the number of events where the momentum P (t)(C-12) did not exceed 0.1 GeV/c saturated about 20%. In nine events, the measured total transverse energy of the fragments in the reference frame comoving with the decaying carbon nucleus did not exceed 0.45 MeV, which did not contradict the excitation of the participant C-12 nucleus to the level at 7.65 MeV. The average value of the transverse momentum in those events was 234 +/- 25 MeV/c.
机译：一种双粒子通道，其中在地态中的BE-8的未结合核（BE-8（GS））是其中一个片段是在每种核子的动量4.5微克/核的动量的事件中选择的片段中的一种片段解离三个α颗粒。有问题的事件被检测到含铅核镜乳液中的含铅核，其在高能量实验室的同步核研究所（Jinr，Dubna）的高能量的同步辐射中进行辐照。在BE-8（GS）核的衰减时产生的α颗粒的平均横向动量为87 +/- 6meV / c，而“单一”α（α）颗粒为123 +/- 15 meV /C。所考虑的反应中横向动量转移的平均值为Pt（12c），为223 +/-20mev / c。涉及Ag和Br靶核的该通道的横截面的平均值为13 +/- 4 MB，而Pb核对反应的横截面为40 +/- 15 MB。库仑解离贡献基于动量p（t）（c-12）不超过0.1 gev / c饱和约20％的事件的数量来评估。在九次事件中，使用衰减碳核的参考框架中的片段的测量总横向能量不超过0.45meV，这与参与者C-12核的激发没有与7.65 meV的水平相矛盾。这些事件中横向动量的平均值为234 +/- 25 mev / c。

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