Re-examining the transition into the N=20 island of inversion: structure of $^{30}$Mg
B. Fernández-Domínguez, B. Pietras, W. N. Catford, N. A. Orr, M. Petri, M. Chartier, S. Paschalis, N. Patterson, J . S. Thomas, M. Caamaño, T. Otsuka, A. Poves,… 展开作者
B. Fernández-Domínguez, B. Pietras, W. N. Catford, N. A. Orr, M. Petri, M. Chartier, S. Paschalis, N. Patterson, J . S. Thomas, M. Caamaño, T. Otsuka, A. Poves, N. Tsunoda, N. L. Achouri, J-C. Angélique, N. I. Ashwood, A . Banu, B. Bastin, R. Borcea, J. Brown, F. Delaunay, S. Franchoo, M. Freer, L. Gaudefroy, S. Heil, M. Labiche, B. Laurent, R. C. Lemmon, A. O. Macchiavelli, F. Negoita, E. S. Paul, C. Rodríguez-Tajes, P. Roussel-Chomaz, M. Staniou, M. J. Taylor, L. Trache, G. L. Wilson
备注：
Physics Letters B, Volume 779, 10 April 2018, Pages 124-129
发表信息：
Physics Letters B, Volume 779, 10 April 2018, Pages 124-129
Intermediate energy single-neutron removal from $^{31}$Mg has been employed to investigate the transition into the N=20 island of inversion. Levels up to 5~MeV excitation energy in $^{30}$Mg were populated and spin-parity assignments were inferred from the corresponding longitudinal momentum distributions and $γ$-ray decay scheme. Comparison with eikonal-model calculations also permitted spectroscopic factors to be deduced. Surprisingly, the 0$^{+}_{2}$ level in $^{30}$Mg was found to have a strength much weaker than expected in the conventional picture of a predominantly $2p - 2h$ intruder configuration having a large overlap with the deformed $^{31}$Mg ground state. In addition, negative parity levels were identified for the first time in $^{30}$Mg, one of which is located at low excitation energy. The results are discussed in the light of shell-model calculations employing two newly developed approaches with markedly different descriptions of the structure of $^{30}$Mg. It is concluded that the cross-shell effects in the region of the island of inversion at Z=12 are considerably more complex than previously thought and that $np - nh$ configurations play a major role in the structure of $^{30}$Mg.
Study of nuclei in the vicinity of the "Island of Inversion" through fusion-evaporation reaction
我们报告的第一个观察到的高自旋状态的核附近的“反转岛”，通过18 O +18 O融合反应填充在入射束能量为34 MeV。聚变反应机制规避了用于填充这些原子核的非平衡反应的限制。从观测到的符合各向异性和线性极化测量中，可以对这些难以填充的核进行详细的自旋宇称测量。详细介绍了~（33）、~（34）P和~（33）S的光谱以及在壳模型框架内的计算结果。
Island of Inversion in neutron-rich cobalt isotopes revealed from mass measurements
Université de Bordeaux, CNRS/IN2P3, LP2I Bordeaux, UMR 5797（波尔多大学）；Université de Strasbourg, CNRS, IPHC UMR 7178（斯特拉斯堡大学）；Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534（诺曼底卡昂大学）；SCK·CEN, Belgian Nuclear Research Centre（比利时核研究中心）；Grand Accélérateur National d’Ions Lourds (GANIL)（重离子国家加速器）；Normandie Univ., UNICAEN（诺曼底大学）；University of Jyväskylä（于韦斯屈莱大学）
First Evidence of Axial Shape Asymmetry and Configuration Coexistence in $^{74}$Zn: Suggestion for a Northern Extension of the $N=40$ Island of Inversion
Extending the Southern Shore of the Island of Inversion to $^{28}$F
详细的光谱学的中子游离核$^{28}$ F已被执行的第一次质子/中子删除后，从$^{29}$ Ne/ $^{29}$ F束在能量约230 MeV/核子。重建了$^{27}$ F $^{(*)}+n$和$^{26}$ F $^{(*)}+2n$符合的不变质谱，并显示了一系列明确的共振。在两个反应中观察到一个近阈值状态，并确定为$^{28}$ F基态，$S_n(^{28}$ F $)=-199(6)$ keV，而$2n$衰变通道的分析允许一个相当大的改进$S_n(^{27}$ F $)=1620(60)$ keV的推导。与壳模型预测和eikonal模型反应计算的比较，允许自旋宇称分配提出的一些较低的水平的$^{28}$ F。重要的是，在基态的情况下，重建的$^{27}$ F $+n$动量分布后，从$^{29}$ F中子去除表明，它主要来自$1p_{3/2}$中子入侵者配置。这表明$N=20$周围的反转岛包括$^{28}$ F，而且很可能包括$^{29}$ F，并表明$^{28}$ O不是双魔。
$β$-decay Measurements Near the $N=40$ Island of Inversion to Quantify Cooling of Accreted Neutron Star Crusts
Michigan State University（密歇根州立大学）；Facility for Rare Isotope Beams, Michigan State University（稀有同位束设施，密歇根州立大学）；Lawrence Livermore National Laboratory（劳伦斯利弗莫尔国家实验室）
Direct transfer to $^{46,48}$K as a survey of the $π(s_{1/2})$$-ν(sdpf)$ interaction
University of Surrey（萨里大学）；Grand Accélérateur National d’Ions Lourds (GANIL)（大型重离子加速器）；Université de Caen Normandie（诺曼底卡昂大学）；ENSICAEN（国立高等工程师学院）；Université Paris-Saclay（巴黎萨克雷大学）；IJCLab（伊贾克实验室）；INFN Sezione di Padova（意大利国家核物理研究所帕多瓦分部）；Dipartimento di Fisica e Astronomia dell’Università di Padova（帕多瓦大学物理与天文系）
