通过源内激光光谱学研究N = 104中壳层之外缺中子铅同位素的核电荷半径。

Nuclear charge radii of neutron-deficient lead isotopes beyond N = 104 midshell investigated by in-source laser spectroscopy.

作者信息

De Witte H, Andreyev A N, Barré N, Bender M, Cocolios T E, Dean S, Fedorov D, Fedoseyev V N, Fraile L M, Franchoo S, Hellemans V, Heenen P H, Heyde K, Huber G, Huyse M, Jeppessen H, Köster U, Kunz P, Lesher S R, Marsh B A, Mukha I, Roussière B, Sauvage J, Seliverstov M, Stefanescu I, Tengborn E, Van de Vel K, Van de Walle J, Van Duppen P, Volkov Yu

机构信息

Instituut voor Kern- en Stralingsfysica, K.U. Leuven, B-3001 Leuven, Belgium.

出版信息

Phys Rev Lett. 2007 Mar 16;98(11):112502. doi: 10.1103/PhysRevLett.98.112502.

DOI:10.1103/PhysRevLett.98.112502

PMID:17501046

Abstract

The shape of exotic even-mass (182-190)Pb isotopes was probed by measurement of optical isotope shifts providing mean square charge radii (delta(r(2))). The experiment was carried out at the isolde (cern) on-line mass separator, using in-source laser spectroscopy. Small deviations from the spherical droplet model are observed, but when compared to model calculations, those are explained by high sensitivity of delta(r(2)) to beyond mean-field correlations and small admixtures of intruder configurations in the ground state. The data support the predominantly spherical shape of the ground state of the proton-magic Z=82 lead isotopes near neutron midshell (N=104).

摘要

通过测量提供均方电荷半径（δ(r²)）的光学同位素位移，对奇特的偶质量（182 - 190）铅同位素的形状进行了探测。该实验在欧洲核子研究中心（CERN）的ISOLDE在线质量分离器上进行，采用源内激光光谱法。观察到与球形液滴模型存在小偏差，但与模型计算相比，这些偏差可由δ(r²)对超出平均场关联的高灵敏度以及基态中侵入者构型的少量混合来解释。数据支持质子幻数Z = 82且靠近中子中壳层（N = 104）的铅同位素基态主要为球形。