New neutron-rich microsecond isomers observed among fission products of 238U at 80 MeV/nucleon

被引：28

作者：

Folden, C. M., III ^{[1
]}

Nettleton, A. S. ^{[1
,2
]}

Amthor, A. M. ^{[1
,2
]}

Ginter, T. N. ^{[1
]}

Hausmann, M. ^{[1
]}

Kubo, T. ^{[3
]}

Loveland, W. ^{[4
]}

Manikonda, S. L. ^{[5
]}

Morrissey, D. J. ^{[1
,6
]}

Nakao, T. ^{[3
,7
]}

Portillo, M. ^{[1
]}

Sherrill, B. M. ^{[1
,2
]}

Souliotis, G. A.

Strong, B. F. ^{[6
]}

Takeda, H. ^{[3
]}

Tarasov, O. B. ^{[1
,8
]}

机构：

[1] Michigan State Univ, Natl Supercond Cyclotron Lab, E Lansing, MI 48824 USA

[2] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[3] RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan

[4] Oregon State Univ, Dept Chem, Corvallis, OR 97330 USA

[5] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[6] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

[7] Univ Tokyo, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan

[8] Joint Inst Nucl Res, Flerov Lab Nucl React, RU-141980 Dubna, Moscow Region, Russia

来源：

PHYSICAL REVIEW C | 2009年 / 79卷 / 06期

基金：

美国国家科学基金会;

关键词：

BETA-DECAY ENERGIES; MU-S-ISOMERS; NUCLEAR-STRUCTURE; HALF-LIFE; ISOTOPES; STATES; IDENTIFICATION; FRAGMENTATION; DEFORMATION;

D O I：

10.1103/PhysRevC.79.064318

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Eight new isomeric states in neutron-rich nuclides have been discovered in fission fragments produced by the reaction of an 80 MeV/nucleon U-238 beam with a Be-9 target and separated in-flight using the A1900 fragment separator. The experiment was conducted at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. Gamma rays were detected in a high-purity germanium detector located at the focal plane within a time window of 20 mu s following ion implantation. In some cases the isomers were observed to decay into previously reported states, allowing us to assign the initial decay from the isomeric state. Among the outcomes, the results suggest that many studies on the nuclear structure of medium-mass neutron-rich nuclei are feasible at projectile fragmentation facilities using induced fission.</p>.

引用

页数：8

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