Hypernuclear study at Φ-Factoy

Φ-Factoy 的超核研究

基本信息

项目摘要

The hypernuclear data on ^6Li, ^7Li, ^<12>C, ^<27>Al, and ^<51> V targets were accumulated during the fast data taking period from October 2003 to March 2004 with the FINUDA detector system at the DAFNE Φ-Factory in Italy The integrated luminosity of 250 pb^<-1> was delivered as scheduled. Almost mono-chromatic K- beam at 16 MeV produced from the ΦK^-K^+ decay was stopped in the very thin (〜200 mg/cm^2) targets. All the data were brought back to Japan and analyzed independently from the Italian collaborators. Calibrations for each detector have been in progress. Although the position resolutions of the tiadking chambers are still not at the optimum values, the calibration peaks corresponding to the K_<μ2> and K_<π2> decays gave us the correct momenta and reasonably good momentum resolutions. We expect the resolution could be further improved in the future analysis. As for the (K^-_<stop>,π^-) reaction spectroscopy, we have obtained ^<12>_ΛC excitation energy spectrum with the energy resolution of 1.45 MeV FWHM. This is as good as so-far the best energy resolution achieved it the world. A few peak structures were observed for the first time. Even for the heavier targets, events were observed in the bound region. We expect several excited states to be resolved in the future analysis.Λ hyperons in the (K^-_<stop>,π^-) reactions were successfully detected in the FINUDA detector from the invariant mass distribution of proton mid π^-. Further we have observed a Λ hyperon accompanied by a proton emitted in the back to-back direction. The invariant mass distribution of the Λ-proton pair indicates that they are coning out from a K_-pp bound system. The binding energy of the system was found to be〜115 MeV. This value is very large as compared to the normal nuclear binding and might imply a possible formation of high density nuclear environment in the system. Production of Σ hypernuclei was also searched by tagging the Λ hyperon from a strong conversion process ΣN→ΛN.
2003<12><27><51>年10月至2004年3月,在意大利DAFNE Φ-工厂使用FINUDA探测器系统,在快速数据采集期间积累了^6 Li、^7 Li、^ C、^ Al和^ V等靶的超核数据<-1>。由ΦK^-K^+衰变产生的能量为16 MeV的几乎单色的K-束流在非常薄的靶(约200 mg/cm ^2)中停止。所有数据都被带回日本,并独立于意大利合作者进行分析。每个探测器的校准工作正在进行中。虽然电离室的位置分辨率还没有达到最佳值,但K_&lt;μ2&gt;和K_&lt;π2&gt;衰变的校准峰给了我们正确的动量和相当好的动量分辨率。我们希望在未来的分析中可以进一步提高分辨率。对于(K^-<stop>,π^-)反应谱,我们得到<12>了能量分辨率为1.45MeV半高宽的^ _ΛC激发能谱。这是迄今为止世界上最好的能源分辨率。首次观察到一些峰结构。即使对于较重的目标,也在结合区域中观察到事件。在<stop>FINUDA探测器上,利用π^-中质子不变的质量分布,成功地探测到了(K^-_,π^-)反应中的Λ超子。此外,我们还观察到一个Λ超子伴随着一个质子在背对背方向发射。Λ-质子对的质量分布不变表明它们是从K-pp束缚系统中锥出的。系统的结合能为115 MeV。与正常的核结合相比,该值非常大,并且可能意味着在系统中可能形成高密度核环境。通过标记强转换过程&lt;$N→ΛN中的Λ超子,也寻找了&lt;$N超核的产生。

项目成果

期刊论文数量(16)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Study of a K-pp bound state in FINUDA
FINUDA 中 K-pp 结合态的研究
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    A.Hasegawa;T.Kishimoto;Y.Mitsumori;F.Minami;K.Sugimoto et al.;H.Fujioka
  • 通讯作者:
    H.Fujioka
FINUDA実験におけるK-pp束縛状態の研究
FINUDA实验中K-pp结合态的研究
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    J.Takeda;K.Takagi;T.Okabe;H.J Ko;T.Yao;K.Tanaka;藤岡宏之
  • 通讯作者:
    藤岡宏之
Hypernuclear Spectroscopy
超核能谱
First Hypernuclear Results from the FINUDA experiment at DAFNE
DAFNE FINUDA 实验的第一个超核结果
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
    K.Tanaka;T.Takahashi;T.Kondo;T.Umebayashi;K.Asai;K.Ema;M.Agnello et al.
  • 通讯作者:
    M.Agnello et al.
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NAGAE Tomofumi其他文献

NAGAE Tomofumi的其他文献

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{{ truncateString('NAGAE Tomofumi', 18)}}的其他基金

High-resolution Spectroscopy of Many-Body systems with Multi-Strangeness
具有多奇异性的多体系统的高分辨率光谱学
  • 批准号:
    23000003
  • 财政年份:
    2011
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Specially Promoted Research
Multi-quark Systems with Strangeness
奇异的多夸克系统
  • 批准号:
    17070005
  • 财政年份:
    2005
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research on Priority Areas
Structure of Heavy Λ hypernuclei with a high-resolution magnetic spectrometer
用高分辨率磁谱仪观察重Λ超核的结构
  • 批准号:
    13440084
  • 财政年份:
    2001
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)

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