Investigation of the Early Stage of the Explosive Hydrogen Burning in the Universe

宇宙中氢爆炸燃烧早期阶段的研究

• 批准号: 13440071
• 负责人: KUBONO Shigeru
• 金额: $ 8.45万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440071/
• 关键词: Nucleosynthesis in the universe; Low-energy Nuclear Reactions; Low-energy RI beams; Novae・X-ray burst; rp-rprocess; αp-process; 短寿命核; s-過程; 高温ppチェーン; 星の進化

Under the present project, a low-energy RI beam separator, CRIB has been developed, which has been successfully providing a unique opportunity to investigate the stellar reactions under explosive burning that involve unstable nuclei for the first time in Japan. A summary of the accomplishment of the works performed in the present is described below :(1)The low-energy RI beam in-flight separator, CRIB that has a configuration of QMDQDMQ+WF, has been developed mainly for pursuing the present project. Here, WF is a velocity filter to purify the RI beams. This system, for instance, has successfully provided an ^<14>O beam of more than 10^6 pps with nearly 100 % purity.(2)One of the most critical stellar reactions for the onset of the explosive hydrogen burning under high temperature and high-density condition, ^<14>O(α,p)^<17>F, was successfully investigated for the first time, confirming roughly the previous theoretical prediction that this reaction is the onset process for the X-ray burs … More t.(3)Another experiment is a study of proton resonances important for ^<11>C(p,γ)^<12>B, which locates at the breakout point from the hot-pp chain in the first generation stars. A new spin-parity assignment has been made for a resonance, identifying the importance of the level for the astrophysical reaction at high temperatures.(4)A series of proton resonance searches have been made for the early stage of the rp-process with RI beams of ^<21>Na, ^<22>Mg,^<23>Mg, ^<25>Al and ^<26>Si from CRIB, identifying new resonances in all systems studied here.(5)Resonant states, relevant to the hot-CNS cycle, were investigated for the 13N(p, g)14O stellar reaction with a 13N beam, confirming very dearly a single particle state predicted long. This resonance will affect the reaction rate at high temperature condition.(6)A high-resolution magnetic spectrograph has been developed for nuclear astrophysics project. A method of high resolution measurements has been developed including the tuning of the Cyclotron, the beam line and the spectrograph, giving about 40 keV for 104 MeV a-beam.. Less

在本项目下，已开发出一种低能RI束分离器CRIB，它成功地提供了一个独特的机会，在日本首次研究爆炸燃烧下涉及不稳定核的恒星反应。（1）为实现本项目的目标，研制了低能RI束流飞行分离器CRIB，其结构为QMDQDMQ+WF。这里，WF是用于净化RI束的速度滤波器。例如，这个系统已经成功地提供了一个<14>10^6 pps以上、纯度接近100%的^ O束流。（2）首次成功地研究了在高温高密度条件下氢爆发燃烧起始的最关键的恒星反应之一^<14>O（α，p）^<17>F，初步证实了该反应是X射线布尔斯起始过程的理论预言 ...更多信息 t.（3）另一个实验是对<11><12>位于第一代恒星热pp链爆发点的^ C（p，γ）^ B的重要质子共振的研究。一个新的自旋宇称分配已作出的共振，确定的重要性，在高温下的天体物理反应的水平。(4)A用CRIB的~ Na、~ Mg、~ Mg、~ Al和~ Si的RI束对rp过程的早期阶段进行了一系列质子共振搜索<21><22><23><25><26>，在这里研究的所有系统中发现了新的共振。（5）研究了~（13）N（p，g）~（14）O与~（13）N束反应的热CNS循环共振态，证实了预言已久的单粒子态。这种共振会影响高温条件下的反应速率。(6)A高分辨率磁谱仪是为核天体物理项目研制的。发展了一种高分辨测量方法，包括回旋加速器、束线和摄谱仪的调谐，对104 MeV的a束给出约40 keV的能量。少

项目成果

Measurement of the 24Mg(p, t)22Mg reaction for the states near the 21Na + p threshold

• DOI: 10.1140/epja/i2002-10024-x
• 发表时间: 2002-08
• 期刊: The European Physical Journal A - Hadrons and Nuclei
• 作者: S. Michimasa;S. Kubono;S. Park;T. Teranishi;Y. Yanagisawa;N. Imai;Z. Fülöp;X. Liu;T. Minemura-T.-Mi

Present Status of the Radioactive Nuclear Beam Facility at KEK-Tanashi and E-arena in the KEK-JAERI Joint Project

KEK-JAERI 联合项目中 KEK-Tanashi 和 E-arena 放射性核束设施的现状

• 发表时间: 2002
• 期刊: Nucl.Phys., Eur.Phys.J.A 701
• 作者: H.Miyatake;et al.
• 通讯作者: et al.

Origin of Matter and the Evolution of the Universe 2003

物质起源与宇宙演化 2003

• 发表时间: 2004
• 作者: M.Terasawa;S.Kubono;T.Kajino;T.Motobayashi
• 通讯作者: T.Motobayashi

S.Michimasa, S.Kubono, 他: "Measurement of the ^<24>Mg(p,t)^<22>Mg Reaction for the States near the ^<21>Na+p Threshold"Eur.Phys.J.. A14. 275-278 (2002)

S.Michimasa、S.Kubono等人：“测量^ 21 Na+p阈值附近状态的^ 24 Mg(p，t)^ 22 Mg反应”Eur.Phys。 J.A14。275-278（2002）

S.Kubono: "Frontier in Nuclear Astrophysics with RI Beams"Progress in Theoretical Physics. (to be published). (2002)

S.Kubono：“RI 光束核天体物理学前沿”理论物理学进展。