High resolution γ spectroscopy of hypernuclei with large Ge detector system

使用大型 Ge 探测器系统进行超核高分辨率 γ 能谱

基本信息

  • 批准号:
    08239102
  • 负责人:
  • 金额:
    $ 87.04万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research on Priority Areas
  • 财政年份:
    1996
  • 资助国家:
    日本
  • 起止时间:
    1996 至 1998
  • 项目状态:
    已结题

项目摘要

The purpose of this research project was to construct a Ge-ball detector and to measure g-transitions of hypernuclei with keV resolution and to open the new field of hypernuclear physics, namely γ-spectroscopy of hypernuclei. After the R&D of the Ge detector and its fast electronics by using π-beams, we have constructed the Ge-ball detector called "Hyperball" with collaboration of Chinese physicists. It consists of 14 pure 60% Ge crystals with BGO Compton suppressors. We have carried out the first experiment at KEK with π-beam and observed γ transitions of hypernuclei with keV resolution for the first time. The "Hyperball" is now wellknown by its great success.The M1 transition between the ground spin-doublet states (3/2 -> 1/2) of ィイD17ィエD1LiィイD2ΛィエD2 was measured to be 690 keV. This splitting is mainly due to the ΛN spin-spin interaction. The experiment, therefore, provided a key data to determine the spin-spin interaction. By using Doppler attenuation method, we measured B(E2) of the transition (5/2 -> l/2) of ィイD17ィエD1LiィイD2ΛィエD2 for the first time. The shrinkage in the nuclear size by Λ particle was first confirmed by this data. This success claims the great ability of γ-spectroscopy of hypernuclei. The γ-transitions of ィイD19ィエD1BeィイD2ΛィエD2 were also observed in the second experiment done at BNL. They are they from the doublet states (5/2, 3/2) to the ground (1/2) which are almost purely due to the LS interaction between Λ and nucleon. The preliminary data shows that the splitting is as small as 30 keV. It indicates that the LS interaction of ΛN is about 100 times smaller than that of the NN interaction.This project was quite successful in its achievement and first results. The γ spectroscopy of hypernuclei is now established as a usable and great tool for the study of hypernuclei.
该研究项目的目的是构建一个锗球探测器,以keV的分辨率测量超核的g跃迁,开辟超核物理的新领域,即超核γ谱。在完成了Ge探测器及其π束快电子学的研制之后,我们与中国物理学家合作研制了名为“Hyperball”的Ge球探测器。它由14个纯的60%锗晶体与BGO康普顿抑制器。我们在KEK进行了第一次π束实验,首次以keV的分辨率观测到超核的γ跃迁。“超球”以其巨大的成功而闻名于世,测量到了690 keV的基态自旋二重态(3/2 -> 1/2)之间的M1跃迁。这种分裂主要是由于ΛN自旋-自旋相互作用。因此,该实验为确定自旋-自旋相互作用提供了关键数据。用多普勒衰减法首次测量了Li_xD_17 → Li_xD_2 → Li_xD_2跃迁(5/2 -> 1/2)的B(E_2)。这一数据首次证实了Λ粒子引起的核尺寸收缩。这一成功证明了超核γ能谱的巨大能力。在BNL进行的第二个实验中也观察到了γ-跃迁的D19 → D1 Be → D2 → D2。它们是从二重态(5/2,3/2)到基态(1/2)的跃迁,它们几乎完全是由Λ与核子的LS相互作用引起的。初步的数据表明,分裂是小到30 keV。结果表明,ΛN的LS相互作用比NN相互作用小100倍左右,该项目的实现和初步结果是相当成功的。超核的γ能谱是研究超核的一个重要工具。

项目成果

期刊论文数量(46)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
J.K.Ahn: "Scalar and vector meson production and two-step processes in the (K^-,K^+)reaction on ^<12>C" Nuclear Physics. A625. 231-250 (1997)
J.K.Ahn:“^<12>C 上的 (K^-,K^) 反应中的标量和矢量介子产生以及两步过程”核物理。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
O. Hashimoto: "The (π^+,Κ^+) reaction and light Λ hypernuclear spectroscopy"Nucl. Phys.. A639. 93c-102c (1998)
O. Hashimoto:“(π^+,Κ^+) 反应和光 Λ 超核光谱”Nucl.. 93c-102c (1998)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
O. Hashimoto: "The (πィイD1+ィエD1, KィイD1+ィエD1) reaction and light Λ hypernuclear spectroscopy"Nucl. Phys. A. 639. 93c-102c (1998)
O. Hashimoto:“(πiD1+D1,KD1+D1) 反应和光Λ超核光谱”Nucl. A. 639. 93c-102c (1998)
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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T.Nagae: "Observation of a ^4_ΣHe Bound State in the ^4He(K^-,π^-) Reaction at 600 MeV/c" Phys.Rev.Lett.80. 1605-1609 (1998)
T.Nagae:“600 MeV/c ^4He(K^-,π^-) 反应中 ^4_ΣHe 束缚态的观察”Phys.Rev.Lett.80 (1998)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
H. Tamura et al.: "High-resolution gamma-ray spectroscopy of ^7_ΛLi and ^9_ΛBe"Proc. Asia Pacific Conf. on Few Body Problems in Physics, Noda/Kashima, Aug, 1998. (in press).
H. Tamura 等人:“^7_ΛLi 和 ^9_ΛBe 的高分辨率伽马射线光谱”Proc. 亚太物理会议,野田/鹿岛,1998 年 8 月。(正在出版)。
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    0
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IMAI Kenichi其他文献

IMAI Kenichi的其他文献

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{{ truncateString('IMAI Kenichi', 18)}}的其他基金

A strategic approach to elucidate the etiology of EBV-induced periodontitis and to develop novel therapies
阐明 EB 病毒引起的牙周炎病因并开发新疗法的战略方法
  • 批准号:
    19K10078
  • 财政年份:
    2019
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Strategic approach towards etiological elucidation and novel therapy development of periodontitis attributed to EBV
EBV 引起的牙周炎病因阐明和新疗法开发的战略方法
  • 批准号:
    16K11526
  • 财政年份:
    2016
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Elucidation of molecular mechanisms HIV viral latency and its reactivation involving epigenetic regulation
阐明HIV病毒潜伏期及其再激活涉及表观遗传调控的分子机制
  • 批准号:
    22790437
  • 财政年份:
    2010
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Search for dark matter axion with Rydberg atoms
用里德伯原子寻找暗物质轴子
  • 批准号:
    20340054
  • 财政年份:
    2008
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Role of transcriptional factor AP-4 in the maintenance of HIV-1 latency
转录因子 AP-4 在维持 HIV-1 潜伏期中的作用
  • 批准号:
    19790345
  • 财政年份:
    2007
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Study of Hyperon-Nucleon Interaction
超子-核相互作用的研究
  • 批准号:
    12304013
  • 财政年份:
    2000
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Study of nuclei with strangeness
奇异核的研究
  • 批准号:
    08239103
  • 财政年份:
    1996
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for Scientific Research on Priority Areas
Search for New Particles in High Energy Heavy Ion Collisions
在高能重离子碰撞中寻找新粒子
  • 批准号:
    05044052
  • 财政年份:
    1993
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for international Scientific Research
Nuclear physics with strangeness
奇异的核物理
  • 批准号:
    04302014
  • 财政年份:
    1992
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for Co-operative Research (A)
Study of hyperon-nucleon interaction with scintillating fiber detector
闪烁光纤探测器研究超子核相互作用
  • 批准号:
    02402008
  • 财政年份:
    1990
  • 资助金额:
    $ 87.04万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (A)

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陌生感的心理生理机制探索性研究
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