Search for η^{'} Bound Nuclei in the ^{12}C(γ,p) Reaction with Simultaneous Detection of Decay Products.
Search for η^{'} Bound Nuclei in the ^{12}C(γ,p) Reaction with Simultaneous Detection of Decay Products.
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DOI：
10.1103/physrevlett.124.202501
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发表时间：
2020-05
影响因子：
8.6
通讯作者：
N. Tomida;N. Muramatsu;M. Niiyama;J. Ahn;W. Chang;J. Chen;M. Chu;S. Daté;T. Gogami;H. Goto;H. Hamano;T. Hashimoto;Q. He;K. Hicks;T. Hiraiwa;Y. Honda;T. Hotta;H. Ikuno;Y. Inoue;T. Ishikawa;I. Jaegle;J. Jo;Y. Kasamatsu;H. Katsuragawa;S. Kido;Y. Kon;T. Maruyama;S. Masumoto;Y. Matsumura;M. Miyabe;K. Mizutani;H. Nagahiro;T. Nakamura;T. Nakano;T. Nam;T. N. T. Ngan-T.-N.-T.-Ngan-4192619;Y. Nozawa;Y. Ohashi;H. Ohnishi;T. Ohta;K. Ozawa;C. Rangacharyulu;S. Ryu;Y. Sada;M. Sasagawa;T. Shibukawa;H. Shimizu;R. Shirai;K. Shiraishi;E. Strokovsky;Y. Sugaya;M. Sumihama;S. Suzuki;S. Tanaka;A. Tokiyasu;Y. Tsuchikawa;T. Ueda;H. Yamazaki;R. Yamazaki;Y. Yanai;T. Yorita;C. Yoshida;M. Yosoi
中科院分区：
文献类型：
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作者：
N. Tomida;N. Muramatsu;M. Niiyama;J. Ahn;W. Chang;J. Chen;M. Chu;S. Daté;T. Gogami;H. Goto;H. Hamano;T. Hashimoto;Q. He;K. Hicks;T. Hiraiwa;Y. Honda;T. Hotta;H. Ikuno;Y. Inoue;T. Ishikawa;I. Jaegle;J. Jo;Y. Kasamatsu;H. Katsuragawa;S. Kido;Y. Kon;T. Maruyama;S. Masumoto;Y. Matsumura;M. Miyabe;K. Mizutani;H. Nagahiro;T. Nakamura;T. Nakano;T. Nam;T. N. T. Ngan-T.-N.-T.-Ngan-4192619;Y. Nozawa;Y. Ohashi;H. Ohnishi;T. Ohta;K. Ozawa;C. Rangacharyulu;S. Ryu;Y. Sada;M. Sasagawa;T. Shibukawa;H. Shimizu;R. Shirai;K. Shiraishi;E. Strokovsky;Y. Sugaya;M. Sumihama;S. Suzuki;S. Tanaka;A. Tokiyasu;Y. Tsuchikawa;T. Ueda;H. Yamazaki;R. Yamazaki;Y. Yanai;T. Yorita;C. Yoshida;M. Yosoi
我们首次测量了^{12}C（γ，p）反应的丢失质谱，这与来自η^C '}束缚核的潜在衰变产物相一致。我们标记了一个与核中的η^n '} N→ηN过程有关的（η+p）对。在应用运动学选择以减少背景之后，在束缚态区域中没有观察到信号事件。在90%的置信水平下，当开度角cosθ lab ^{ηp}<-0.9时，信号截面的上限为2.2 nb/sr。它与理论截面进行了比较，理论截面的归一化模糊性通过测量准自由的η^η '}产生速率来抑制。我们的结果表明，η^N '} N→ηN过程的分支分数很小，而且η^N'}核势很浅.
We measured missing mass spectrum of the ^{12}C(γ,p) reaction for the first time in coincidence with potential decay products from η^{'} bound nuclei. We tagged an (η+p) pair associated with the η^{'}N→ηN process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle cosθ_{lab}^{ηp}<-0.9 was obtained to be 2.2 nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree η^{'} production rate. Our results indicate a small branching fraction of the η^{'}N→ηN process and/or a shallow η^{'}-nucleus potential.