Nucleosynthesis in Explosive Hydrogen Burning
爆炸性氢燃烧中的核合成
基本信息
- 批准号:10440070
- 负责人:
- 金额:$ 8.7万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1998
- 资助国家:日本
- 起止时间:1998 至 2000
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
(1) Investigation of the property of the crucial state, the 4.033 MeV 3/2^+ state in ^<19>Ne, which dominates the reaction rate of ^<15>O(α,γ)^<19>Ne that determines the onset of novae. This state was studied by the charge-symmetry reactions ^<20>Ne(d,t) and (d,^3He), resulting in J^π=3/2^+ and S=0.033. The α-decay property was also studied by exciting the state by the ^<20>Ne(^3He,t) reaction, and measuring the α decay with Si detectors. However, no significant events were observed above the background level, suggesting the upper limit of the α-width to be 100μeV. (2) The structure of ^<14>O which is crucial for the trigger reaction of the high-T rp-process, ^<14>O(α,p)^<17>F, was also investigated by a high-precision measurement of the ^<20>Ne(p,t) ^<18>Ne reaction with a magnetic spectrograph. Excitation energy determination with high precision and spin assignments were made for the states near the α threshold in ^<18>Ne. (3) Similarly, the structure of ^<22>Mg was studied by the (p … More ,t) reaction, resulting in a discovery of some new resonances near the proton threshold. The new resonances will have significant influences as they are in the range of the Gamow window of novae. (4) The asymptotic normalization (ANC) method was successfully tested with using a direct transfer reaction of ^<12>C(d,p)^<13>C at 11.8 MeV. It provided us a very low-energy direct neutron capture cross sections with an uncertainty of about 8 %. This proves that the ANC method is useful for applying to the direct neutron capture reactions within an uncertainty of about ±10 %. (5) A focal plane detector was developed which has a high ability in particle identification using a large-area Si detectors. (6) A new RI-beam separator and the experimental detectors were developed to study the nuclear reactions under explosive conditions in the Universe. (7) Nova model calculations, including the reaction rates obtained here, were performed to deduce the elemental abundance productions and also to identify crucial reactions to be investigated for the nova problem. Less
(1)研究了^<19>Ne中的关键态4.033 MeV 3/2^+的性质,该态支配了^<15>O(α,γ)^<19>Ne的反应速率,决定了新星的发生。通过电荷对称反应^<20>Ne(d,t)和(d,^3He)研究了这一状态,得到J^π=3/2^+和S=0.033。用^<20>Ne(^3He,t)反应激发α-衰变,并用Si探测器测量α-衰变,研究了α-衰变性质。但在背景水平以上未观察到显著事件,表明α-宽度的上限为100μeV。(2)用磁谱仪高精度测量了^<20>Ne(p,t) ^<18>Ne反应,研究了^<14>O(α,p)^<17>F)对高t rp过程触发反应至关重要的^<14>O的结构。在^<18>Ne的α阈值附近进行了高精度的激发能测定和自旋赋值。(3)同样,用(p…More,t)反应研究了^<22>Mg的结构,在质子阈值附近发现了一些新的共振。这些新的共振在新星的伽莫夫窗口范围内,将会产生重要的影响。(4)在11.8 MeV下,用^<12>C(d,p)^<13>C的直接转移反应成功地测试了渐近归一化(ANC)方法。它为我们提供了一个非常低能量的直接中子捕获截面,不确定度约为8%。这证明了ANC方法在±10%的不确定度范围内适用于直接中子捕获反应。(5)利用大面积硅探测器研制了一种具有高分辨能力的焦平面探测器。(6)研制了一种新型ri束分离器和实验探测器,用于研究宇宙中爆炸条件下的核反应。(7)新星模型计算,包括这里得到的反应速率,用于推断元素丰度的产生,并确定新星问题需要研究的关键反应。少
项目成果
期刊论文数量(58)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A.Tokuhisa and T,Kajino: "Meson Synchrotron Emission from Central Energies of Gamma-Ray Bursts with Strong Magnetic Fields"Astraphys,J.. 525. L117-L120 (1999)
A.Tokuhisa 和 T, Kajino:“强磁场伽马射线暴中心能量的介子同步加速器发射”Astraphys,J.. 525. L117-L120 (1999)
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
S.Kubono: "Study of Explosive Hydrogen Burning Using ^3He Beams" Nucl.Instr.Methods. A402. 412-416 (1998)
S.Kubono:“使用 ^3He 光束进行爆炸性氢燃烧的研究”Nucl.Instr.Methods。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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- 通讯作者:
N.Batemann et al.: "Measurement of the ^<24>Mg(p.t)^<22>Mg Reaction and Implication for the ^<21>Na(p.γ)^<22>Mg Stellar Reaction Rate"Phys.Rev.C. 63. 035-803,1-13 (2001)
N.Batemann 等人:“^ 24 Mg(p.t)^ 22 Mg 反应的测量及其对 ^ 21 Na(p.γ)^ 22 Mg 恒星反应速率的影响”Phys。修订版 C. 63. 035-803,1-13 (2001)
- DOI:
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- 影响因子:0
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X.Liu et al.: "Advanced Focal Plane Detector with Improved Particle Identification"Nucl.Instr,Meshod A. 432. 66-73 (1999)
X.Liu等人:“具有改进的粒子识别的先进焦平面探测器”Nucl.Instr,Meshod A.432.66-73(1999)
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
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J.Y.Huh et al.: "Observation of Intermediate Bands feeding the Positive-Parity Yrast Band in ^<155>Gd"Eur.Phys,J.. A7. 11-14 (2000)
J.Y.Huh 等人:“观察 ^<155>Gd 中正奇偶校验 Yrast 带的中间带”Eur.Phys,J.. A7。
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KUBONO Shigeru其他文献
KUBONO Shigeru的其他文献
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{{ truncateString('KUBONO Shigeru', 18)}}的其他基金
Study of Alpha-Cluster Structure for Astrophysical Reactions
天体物理反应的α星团结构研究
- 批准号:
21340053 - 财政年份:2009
- 资助金额:
$ 8.7万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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 - 财政年份:2001
- 资助金额:
$ 8.7万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
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The role of proton-unbound 69Br in rp-process nucleosynthesis
未结合质子的 69Br 在 rp 过程核合成中的作用
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美日合作研究:质子滴水线附近 rp 过程核的质量测量
- 批准号:
0735989 - 财政年份:2007
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$ 8.7万 - 项目类别:
Standard Grant
The role of proton-unbound 69Br in rp-process nucleosynthesis
未结合质子的 69Br 在 rp 过程核合成中的作用
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317012-2007 - 财政年份:2007
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The role of Bromine-69 in rp-process nucleosynthesis
Bromine-69 在 rp 过程核合成中的作用
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