ELECTRON-CAPTURE-DELAYED FISSION PROPERTIES OF AM-234

被引：33

作者：

HALL, HL ^{[1
]}

GREGORICH, KE ^{[1
]}

HENDERSON, RA ^{[1
]}

GANNETT, CM ^{[1
]}

CHADWICK, RB ^{[1
]}

LEYBA, JD ^{[1
]}

CZERWINSKI, KR ^{[1
]}

KADKHODAYAN, B ^{[1
]}

KREEK, SA ^{[1
]}

LEE, DM ^{[1
]}

NURMIA, MJ ^{[1
]}

HOFFMAN, DC ^{[1
]}

PALMER, CEA ^{[1
]}

BAISDEN, PA ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV NUCL SCI, BERKELEY, CA 94720 USA

来源：

PHYSICAL REVIEW C | 1990年 / 41卷 / 02期

关键词：

D O I：

10.1103/PhysRevC.41.618

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：

Delayed fission following the electron-capture decay of Am234 was studied. The Np237(±,7n)234Am reaction with multiple Np237 targets was used to produce Am234. The fission properties and half-life of Am234 were measured using a rotating-wheel system. The half-life of Am234 was determined to be 2.32±0.08 min from measurements of the fission activity. A highly asymmetric mass-yield distribution was observed for the fission activity, and the average total kinetic energy of the fission fragments was found to be 173±5 MeV. Radiochemical separations confirmed the elemental assignment of the fissioning species to americium or fission from short-lived excited states in its EC daughter, plutonium. The cross section for Am234 produced by this reaction and decaying by electron capture was determined to be 5.4±1.3 b by measuring the intensities of the daughter plutonium K x rays in radiochemically separated americium samples. The branching ratio of the 6.46-MeV ± peak of Am234 was found to be (3.9±1.2)×10-4 in on-line measurements. The delayed-fission probability was determined to be (6.6±1.8)×10-5 from the measured ratio of fissions to plutonium K x rays. The observed fissions were unambiguously assigned to an EC-delayed fission process by measuring fissions coincident with the K-capture x rays. © 1990 The American Physical Society.

引用

页码：618 / 630

页数：13

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