Resonant versus nonresonant nuclear excitation of 115In by positron annihilation -: art. no. 054603

被引：8

作者：

Cassidy, DB ^{[1
]}

Hunt, AW

Asoka-Kumar, P

Bhat, BV

Cowan, TE

Howell, RH

Lynn, KG

Mills, AP

Palathingal, JC

Golovchenko, JA

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] Washington State Univ, Ctr Mat Res, Pullman, WA 99164 USA

[3] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[4] Sri JCBM Coll, Sringeri, Karnataka, India

[5] Washington State Univ, Dept Phys, Pullman, WA 99164 USA

[6] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

[7] Univ Puerto Rico, Dept Phys, Mayaguez, PR 00680 USA

来源：

PHYSICAL REVIEW C | 2001年 / 64卷 / 05期

关键词：

D O I：

10.1103/PhysRevC.64.054603

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：

We have measured the resonant cross section sigma (n), for nuclear excitation of In-115 via the radiationless annihilation of a positron with a K-shell electron using a monoenergetic positron beam and a thin In target. We find an upper limit on the resonant cross section sigma (n), <4.3 x 10(-26) cm(2) at a 99% confidence level, compared to the cross section <sigma>(beta)= 1.7 x 10(-25) cm(2) determined by two previous measurements of nuclear excitation of In-115 using the broad spectrum of positrons from the beta decay of Cu-64. Together these results imply the existence of a hitherto unidentified nonresonant channel for nuclear excitation via energetic positrons.

引用

页码：546031 / 546035

页数：5

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