• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >High-precision mass measurement of N = Z = 34 nuclides for RP-process simulations and developments for the LEBIT facility.
【24h】

High-precision mass measurement of N = Z = 34 nuclides for RP-process simulations and developments for the LEBIT facility.

机译：N = Z = 34核素的高精度质量测量，用于RP过程仿真和LEBIT设施的开发。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Low Energy Beam and Ion Trap (LEBIT) facility at the National Superconducting Cyclotron Laboratory (NSCL) performs high precision mass measurements of rare isotopes. Within this work mass measurements in the N ≈ Z ≈ 34 region were performed by Penning trap mass spectrometry. Mass measurements of nuclei in this region are important for understanding the rp process, a driving mechanism behind type I x-ray bursts. The masses measured were 68Se, 70Se, 70mBr, and 71Br and experimental uncertainties ranging from 0.5 keV for 68Se to 15 keV for 70mBr were achieved. Using the LEBIT results along with theoretical Coulomb displacement energies [1] more reliable mass predictions were obtained for 70Kr and 71Kr. The new and improved data were used as input for rp process network calculations. An increase in the effective lifetime of the waiting point nucleus 685se was observed, thus confirming it as a large source of delay in the rp process. More precise information was also obtained on the luminosity during a type I x-ray burst and on the distribution of the final abundances after a burst.;Beam manipulation and detection are an important part of the high precision mass measurement process performed at the LEBIT facility. Several upgrades to the LEBIT facility for improved beam quality, control, and observation are presented. The properties of ion pulses ejected from the facility's beam cooler and buncher were investigated and optimized for improved contaminant ion detection and removal. To increase the ion detection efficiency after the Penning trap a multichannel plate detector was implemented in a Daly detector configuration. These upgrades were instrumental in moving the LEBIT facility towards measurements of nuclei with lower yields and higher levels of contaminant.
机译：国家超导回旋加速器实验室（NSCL）的低能束和离子阱（LEBIT）设施可对稀有同位素进行高精度质量测量。在这项工作中，N＆ap; Z＆ap;通过潘宁阱质谱法进行34个区域。对该区域核的质量测量对于理解rp过程（I型X射线爆发背后的驱动机制）很重要。测得的质量分别为68Se，70Se，70mBr和71Br，实验不确定度范围从68ke的0.5 keV到70mBr的15 keV。使用LEBIT结果和理论库仑位移能[1]，可以更可靠地预测70Kr和71Kr的质量。新的和改进的数据用作rp过程网络计算的输入。观察到了等待点核685se的有效寿命的增加，因此确认它是rp过程中大量延迟的原因。还获得了有关I型X射线猝发期间的发光度以及猝发之后最终丰度分布的更精确信息。;光束操纵和检测是LEBIT设施执行的高精度质量测量过程的重要组成部分。提出了LEBIT设施的几项升级，以改善光束质量，控制和观察。从设备的束流冷却器和束流器中喷射出的离子脉冲的特性已得到研究和优化，以改善污染物离子的检测和去除。为了增加Penning阱后的离子检测效率，在Daly检测器配置中实施了多通道板检测器。这些升级有助于使LEBIT设施朝着产量更低和污染物含量更高的核测量方面发展。

著录项

  • 作者

    Savory, Joshua J.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Physics Nuclear.;Physics Atomic.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 142 p.
  • 总页数 142
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号