Nuclear Resonance Fluorescence off 54Cr: The Onset of the Pygmy Dipole Resonance

Nuclear Resonance Fluorescence off 54Cr: The Onset of the Pygmy Dipole Resonance
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54Cr 的核共振荧光:侏儒偶极子共振的开始

DOI:
10.1088/1742-6596/724/1/012040
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发表时间:
2016
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
--
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--
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在过去的几年里,中子分离阈值以下的低位电和磁偶极激发(E1和M1),特别是俾格米偶极共振(PDR),引起了相当大的关注。到目前为止,在A= 90和A= 140附近的质量区域中的大多数中等重核被检查相对于PDR。在目前的工作中,系统的PDR已被扩展,通过测量激发强度和宇称量子数的J= 1状态在较轻的核附近的A= 50,以收集信息的PDR的发病。利用达姆施塔特超导电子直线加速器(S-DALINAC)产生的9.7MeV的韧致辐射,用核共振荧光法对50、52、54 Cr和48、50 Ti核进行了测量。许多激发态被观察到,其中许多是第一次。这些态的宇称量子数是在美国北卡罗来纳州达勒姆三角大学核实验室的高强度γ射线源(HIγS)上测定的。信息的方法和实验设置将提供和54铬实现的结果将讨论相对于PDR的发病。
Low-lying electric and magnetic dipole excitations (E1 and M1) below the neutron separation threshold, particularly the Pygmy Dipole Resonance (PDR), have drawn considerable attention in the last years. So far, mostly moderately heavy nuclei in the mass regions around A= 90 and A= 140 were examined with respect to the PDR. In the present work, the systematics of the PDR have been extended by measuring excitation strengths and parity quantum numbers of J= 1 states in lighter nuclei near A= 50 in order to gather information on the onset of the PDR. The nuclei 50, 52, 54 Cr and 48, 50 Ti were examined via bremsstrahlung produced at the DArmstadt Superconducting electron Linear Accelerator (S-DALINAC) with photon energies up to 9.7 MeV with the method of nuclear resonance fluorescence. Numerous excited states were observed, many of which for the first time. The parity quantum numbers of these states have been determined at the High Intensity Gamma-ray Source (HIγS) of the Triangle Universities Nuclear Laboratory in Durham, NC, USA. Informations to the methods and the experimental setups will be provided and the results on 54 Cr achieved will be discussed with respect to the onset of the PDR.
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