用束内γ射线能谱法研究Mg30的结构

N. Kitamura, K. Wimmer, N. Shimizu, V. Bader, C. Bancroft, D. Barofsky, T. Baugher, D. Bazin, J. Berryman, V. Bildstein, A. Gade, N. I. T. K. C. L. J. L. E. Lunderberg, G. P. F. R. T. Redpath, S. Saenz, D. Smalley, Steven Ragnar Stroberg, J. Tostevin, N. Tsunoda, Y. Utsuno, D. Weisshaar, A. Westerberg
{"title":"用束内γ射线能谱法研究Mg30的结构","authors":"N. Kitamura, K. Wimmer, N. Shimizu, V. Bader, C. Bancroft, D. Barofsky, T. Baugher, D. Bazin, J. Berryman, V. Bildstein, A. Gade, N. I. T. K. C. L. J. L. E. Lunderberg, G. P. F. R. T. Redpath, S. Saenz, D. Smalley, Steven Ragnar Stroberg, J. Tostevin, N. Tsunoda, Y. Utsuno, D. Weisshaar, A. Westerberg","doi":"10.1103/physrevc.102.054318","DOIUrl":null,"url":null,"abstract":"Background: In the \"island of inversion\", ground states of neutron-rich $sd$-shell nuclei exhibit strong admixtures of intruder configurations from the $fp$ shell. The nucleus $^{30}$Mg, located at the boundary of the island of inversion, serves as a cornerstone to track the structural evolution as one approaches this region. Purpose: Spin-parity assignments for excited states in $^{30}$Mg, especially negative-parity levels, have yet to be established. In the present work, the nuclear structure of $^{30}$Mg was investigated by in-beam $\\gamma$-ray spectroscopy mainly focusing on firm spin-parity determinations. Method: High-intensity rare-isotope beams of $^{31}$Mg, $^{32}$Mg, $^{34}$Si, and $^{35}$P bombarded a Be target to induce nucleon removal reactions populating states in $^{30}$Mg. $\\gamma$ rays were detected by the state-of-the-art $\\gamma$-ray tracking array GRETINA. For the direct one-neutron removal reaction, final-state exclusive cross sections and parallel momentum distributions were deduced. Multi-nucleon removal reactions from different projectiles were exploited to gain complementary information. Results: With the aid of the parallel momentum distributions, an updated level scheme with revised spin-parity assignments was constructed. Spectroscopic factors associated with each state were also deduced. Conclusions: Results were confronted with large-scale shell-model calculations using two different effective interactions, showing excellent agreement with the present level scheme. However, a marked difference in the spectroscopic factors indicates that the full delineation of the transition into the island of inversion remains a challenge for theoretical models.","PeriodicalId":8464,"journal":{"name":"arXiv: Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2020-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Structure of \\nMg30\\n explored via in-beam \\nγ\\n-ray spectroscopy\",\"authors\":\"N. Kitamura, K. Wimmer, N. Shimizu, V. Bader, C. Bancroft, D. Barofsky, T. Baugher, D. Bazin, J. Berryman, V. Bildstein, A. Gade, N. I. T. K. C. L. J. L. E. Lunderberg, G. P. F. R. T. Redpath, S. Saenz, D. Smalley, Steven Ragnar Stroberg, J. Tostevin, N. Tsunoda, Y. Utsuno, D. Weisshaar, A. Westerberg\",\"doi\":\"10.1103/physrevc.102.054318\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Background: In the \\\"island of inversion\\\", ground states of neutron-rich $sd$-shell nuclei exhibit strong admixtures of intruder configurations from the $fp$ shell. The nucleus $^{30}$Mg, located at the boundary of the island of inversion, serves as a cornerstone to track the structural evolution as one approaches this region. Purpose: Spin-parity assignments for excited states in $^{30}$Mg, especially negative-parity levels, have yet to be established. In the present work, the nuclear structure of $^{30}$Mg was investigated by in-beam $\\\\gamma$-ray spectroscopy mainly focusing on firm spin-parity determinations. Method: High-intensity rare-isotope beams of $^{31}$Mg, $^{32}$Mg, $^{34}$Si, and $^{35}$P bombarded a Be target to induce nucleon removal reactions populating states in $^{30}$Mg. $\\\\gamma$ rays were detected by the state-of-the-art $\\\\gamma$-ray tracking array GRETINA. For the direct one-neutron removal reaction, final-state exclusive cross sections and parallel momentum distributions were deduced. Multi-nucleon removal reactions from different projectiles were exploited to gain complementary information. Results: With the aid of the parallel momentum distributions, an updated level scheme with revised spin-parity assignments was constructed. Spectroscopic factors associated with each state were also deduced. Conclusions: Results were confronted with large-scale shell-model calculations using two different effective interactions, showing excellent agreement with the present level scheme. However, a marked difference in the spectroscopic factors indicates that the full delineation of the transition into the island of inversion remains a challenge for theoretical models.\",\"PeriodicalId\":8464,\"journal\":{\"name\":\"arXiv: Nuclear Experiment\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2020-10-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv: Nuclear Experiment\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1103/physrevc.102.054318\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv: Nuclear Experiment","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1103/physrevc.102.054318","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3

摘要

背景:在“反转岛”中,富中子的$sd$壳层核的基态表现出来自$fp$壳层的强侵入体结构的混合。$^{30}$Mg核位于逆位岛的边界,在接近该区域时可作为跟踪构造演化的基石。目的:$^{30}$Mg激发态的自旋宇称赋值,特别是负宇称水平,尚未建立。在本工作中,用束内γ射线能谱研究了$^{30}$Mg的核结构,主要集中在确定自旋宇称。方法:$^{31}$Mg, $^{32}$Mg, $^{34}$Si和$^{35}$P的高强度稀有同位素束轰击Be靶,诱导核子去除反应填充$^{30}$Mg态。伽马射线是由最先进的伽马射线跟踪阵列GRETINA探测到的。对于直接的单中子去除反应,推导出了末态独占截面和平行动量分布。利用不同弹丸的多核子去除反应来获得互补信息。结果:利用平行动量分布,构造了一个修正自旋宇称赋值的能级格式。并推导出与每种状态相关的光谱因子。结论:结果与使用两种不同有效相互作用的大尺度壳模型计算相冲突,显示出与当前水平方案的良好一致性。然而,光谱因子的显著差异表明,全面描述向反演岛的过渡仍然是理论模型的一个挑战。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structure of Mg30 explored via in-beam γ -ray spectroscopy
Background: In the "island of inversion", ground states of neutron-rich $sd$-shell nuclei exhibit strong admixtures of intruder configurations from the $fp$ shell. The nucleus $^{30}$Mg, located at the boundary of the island of inversion, serves as a cornerstone to track the structural evolution as one approaches this region. Purpose: Spin-parity assignments for excited states in $^{30}$Mg, especially negative-parity levels, have yet to be established. In the present work, the nuclear structure of $^{30}$Mg was investigated by in-beam $\gamma$-ray spectroscopy mainly focusing on firm spin-parity determinations. Method: High-intensity rare-isotope beams of $^{31}$Mg, $^{32}$Mg, $^{34}$Si, and $^{35}$P bombarded a Be target to induce nucleon removal reactions populating states in $^{30}$Mg. $\gamma$ rays were detected by the state-of-the-art $\gamma$-ray tracking array GRETINA. For the direct one-neutron removal reaction, final-state exclusive cross sections and parallel momentum distributions were deduced. Multi-nucleon removal reactions from different projectiles were exploited to gain complementary information. Results: With the aid of the parallel momentum distributions, an updated level scheme with revised spin-parity assignments was constructed. Spectroscopic factors associated with each state were also deduced. Conclusions: Results were confronted with large-scale shell-model calculations using two different effective interactions, showing excellent agreement with the present level scheme. However, a marked difference in the spectroscopic factors indicates that the full delineation of the transition into the island of inversion remains a challenge for theoretical models.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信