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arXiv 2202.01981physics.ins-detnucl-exnucl-th
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$^{16}$ N异构束的飞行中产生

In-flight production of an isomeric beam of $^{16}$N

C. R. Hoffman, T. L. Tang, M. Avila, Y. Ayyad, K. W. Brown, J. Chen, K. A. Chipps, H. Jayatissa, B. P. Kay, C. Müller-Gatermann, H. J. Ong, J. Song, G. L. Wilson

摘要:

在最近升级的阿贡串列直线加速器系统(ATLAS)飞行系统上,通过单中子添加($d$,$p$)反应的逆运动学产生了一束飞行中的$^{16}$ N。在反应能量为7.9(3)MeV/$u$时,处于其激发的0.120-MeV $J^π=0^-$异构态(T $_{1/2}\approx5$ $μ$ s)的$^{16}$ N束的量被确定为40(5)%,在反应能量为13.2(2)MeV/ $u$时为24(2)%。异构体测量在生产目标下游的实验站$\approx30$ m处进行,并利用Al束停止箔和HPGe Clover探测器。用Si $Δ$ E-E望远镜在实验站和阿贡飞行中放射性离子束分离器(RAISOR)的焦平面上进行了复合$^{16}$ N束流率测定。为了估计$^{16}$ N异构体的相对产率和复合$^{16}$ N的束流速率,将扭曲波玻恩近似(DWBA)方法与$^{16}$ N的已知光谱信息相结合。除了所观察到的反应能量的异构体馏分的依赖性,一个大的灵敏度角接受的反冲也被观察到。

英文摘要:

An in-flight beam of $^{16}$N was produced via the single-neutron adding ($d$,$p$) reaction in inverse kinematics at the recently upgraded Argonne Tandem Linear Accelerator System (ATLAS) in-flight system. The amount of the $^{16}$N beam which resided in its excited 0.120-MeV $J^π=0^-$ isomeric state (T$_{1/2}\approx5$ $μ$s) was determined to be 40(5)% at a reaction energy of 7.9(3) MeV/$u$, and 24(2)% at a reaction energy of 13.2(2) MeV/$u$. The isomer measurements took place at an experimental station $\approx30$ m downstream of the production target and utilized an Al beam-stopping foil and a HPGe Clover detector. Composite $^{16}$N beam rate determinations were made at the experimental station and the focal plane of the Argonne in-flight radioactive ion-beam separator (RAISOR) with Si $Δ$E-E telescopes. A Distorted Wave Born Approximation (DWBA) approach was coupled with the known spectroscopic information on $^{16}$N in order to estimate the relative $^{16}$N isomer yields and composite $^{16}$N beam rates. In addition to the observed reaction-energy dependence of the isomer fraction, a large sensitivity to angular acceptance of the recoils was also observed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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