极化转移的第一个测量$ c^n_ {x'} $在deuteron photoDiseNTEMETATION中

论文标题

极化转移的第一个测量$ c^n_ {x'} $在deuteron photoDiseNTEMETATION中

First measurement of polarisation transfer $C^n_{x'}$ in deuteron photodisintegration

论文作者

Bashkanov, M., Watts, D. P., Kay, S. J. D., Abt, S., Achenbach, P., Adlarson, P., Afzal, F., Ahmed, Z., Akondi, C. S., Annand, J. R. M., Arends, H. J., Beck, R., Biroth, M., Borisov, N., Braghieri, A., Briscoe, W. J., Cividini, F., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fegan, S., Fix, A., Gardner, S., Ghosal, D., Glazier, D. I., Gorodnov, I., Gradl, W., Guenther, M., Gurevich, D., Heijkenskjöld, L., Hornidge, D., Huber, G. M., Käser, A., Kashevarov, V. L., Korolija, M., Krusche, B., Lazarev, A., Livingston, K., Lutterer, S., MacGregor, I. J. D., Manley, D. M., Martel, P. P., Miskimen, R., Mornacchi, E., Mullen, C., Neganov, A., Neiser, A., Ostrick, M., Otte, P. B., Paudyal, D., Pedroni, P., Powell, A., Prakhov, S. N., Sokhoyan, V., Spieker, K., Steffen, O., Strakovsky, I. I., Strub, T., Supek, I., Thiel, A., Thiel, M., Thomas, A., Usov, Yu. A., Wagner, S., Wettig, J., Wolfes, M., Zachariou, N.

论文摘要

已经进行了从圆氘光分解中的最终状态中子（$ c^n_ {x'} $）的极化转移的第一个测量。该数量是在光子能量范围370〜-〜700〜MEV上确定的，对于中子质量分解角$ \ sim45-120^{\ circ} $。最终状态中子的极化是由辅助大受众核苷极化计确定的，围绕MAMI晶体球检测器内的低温液体氘靶。偏振仪表征了$（n，p）$弹出中子的电荷交换以确定其极化。还将新的$ c^n_ {x'} $数据与基于基于当前世界 - 光电分散测量世界世界数据库的核能和核子共振度的理论模型进行了比较。在$ d^*（2380）$的区域中观察到的$ c^n_ {x'} $中的结构无法通过deuteron photodisigntration的常规模型来解释。

A first measurement of the polarisation transfer from a circularly-polarised photon to the final state neutron ($C^n_{x'}$) in deuterium photodisintegration has been carried out. This quantity is determined over the photon energy range 370~--~700~MeV and for neutron centre-of-mass breakup angles $\sim45-120^{\circ}$. The polarisation of the final state neutrons was determined by an ancillary large-acceptance nucleon polarimeter, surrounding a cryogenic liquid deuterium target within the Crystal Ball detector at MAMI. The polarimeter characterised $(n,p)$ charge exchange of the ejected neutrons to determine their polarisation. The new $C^n_{x'}$ data are also compared to a theoretical model based on nucleonic and nucleon resonance degrees of freedom constrained by the current world-database of deuterium photodisintegration measurements. Structures in $C^n_{x'}$ observed in the region of the $d^*(2380)$ could not be explained by conventional models of deuteron photodisintegration.

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