HIGH RESOLUTION WS BEAM LINE AT RCNP
HIGH RESOLUTION WS BEAM LINE AT RCNP
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RCNP 高分辨率 WS 光束线
DOI：
10.1063/1.1435304
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
H. Ueno
中科院分区：
文献类型：
--
作者：
T. Wakasa;K. Hatanaka;H. Fujimura;J. Kamiya;T. Kawabata;K. Nagayama;M. Uraki;Y. Fujita;H. Fujita;Y. Shimbara;M. Itoh;H. Sakaguchi;H. Takeda;M. Uchida;M. Yosoi;G. Berg;T. Noro;K. Tamura;H. Ueno
我们设计和建造了一条新的光束线，它可以完成横向和角色散与大雷电光谱仪的匹配。在色散模式下，光束线的横向和角色散分别为b16 = 37.1 m和b26 = − 20.0 rad，以满足Grand Raiden的匹配条件。在消色差模式下，光束线满足b16 = b26 = 0的双消色差条件。对于色散和消色差模式，光束线的放大率分别为（Mx，M y）=（− 0.98，0.89）和（− 1.00，− 0.99）。在调试实验中，我们成功地将（p，p ′）反应中Ex = 79.8keV的~（168）Er的第一激发态~（2+）从基态中分离出来。对于295 MeV和392 MeV质子，半峰全宽的能量分辨率分别为13.0 ± 0.3 keV和16.7 ± 0.3 keV。这些能量分辨率与Grand Raiden对约1 mm大小的物体的分辨率一致。
We have designed and constructed a new beam line which can accomplish both lateral and angular dispersion matching with the Grand Raiden spectrometer. In dispersive mode, lateral and angular dispersions of the beam line are b16=37.1 m and b26=−20.0 rad, respectively, to satisfy matching conditions for Grand Raiden. In achromatic mode, the beam line satisfies the double achromatic condition of b16=b26=0. The magnifications of the beam line are (Mx ,M y) = (−0.98, 0.89) and (−1.00, −0.99) for dispersive and achromatic modes, respectively. In the commissioning experiments, we have succeeded to separate the first excited 2 + state of 168 Er with Ex=79.8 keV clearly from the ground state in the (p, p � ) reaction. We achieved energy resolutions of ∆E=13.0±0.3 keV and 16.7±0.3 keV in full width at half maximum for 295 MeV and 392 MeV protons, respectively. These energy resolutions agree with the resolving power of Grand Raiden for an object size of about 1 mm.