In-beam measurements of sub-nanosecond nuclear lifetimes with a mixed array of HPGe and LaBr3:Ce detectors

被引：93

作者：

Marginean, N. ^{[1
]}

Balabanski, D. L. ^{[2
]}

Bucurescu, D. ^{[1
]}

Lalkovski, S. ^{[3
]}

Atanasova, L. ^{[2
]}

Cata-Danil, G. ^{[1
]}

Cata-Danil, I. ^{[1
]}

Daugas, J. M. ^{[4
]}

Deleanu, D. ^{[1
]}

Detistov, P. ^{[2
]}

Deyanova, G. ^{[3
]}

Filipescu, D. ^{[1
]}

Georgiev, G. ^{[5
]}

Ghita, D. ^{[1
]}

Gladnishki, K. A. ^{[3
]}

Lozeva, R. ^{[5
]}

Glodariu, T. ^{[1
]}

Ivascu, M. ^{[1
]}

Kisyov, S. ^{[3
]}

Mihai, C. ^{[1
]}

Marginean, R. ^{[1
]}

Negret, A. ^{[1
]}

Pascu, S. ^{[1
]}

Radulov, D. ^{[3
]}

Sava, T. ^{[1
]}

Stroe, L. ^{[1
]}

Suliman, G. ^{[1
]}

Zamfir, N. V. ^{[1
]}

机构：

[1] Horia Hulubei Natl Inst Phys & Nucl Engn IFIN HH, R-76900 Bucharest, Romania

[2] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

[3] St Kliment Ohridski Univ, Sofia, Bulgaria

[4] CEA, DAM, DIF, F-91297 Arpajon, France

[5] CSNSM, F-91404 Orsay, France

来源：

EUROPEAN PHYSICAL JOURNAL A | 2010年 / 46卷 / 03期

关键词：

NEUTRON-RICH NUCLEI;

D O I：

10.1140/epja/i2010-11052-7

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：

A fast-timing method to determine lifetimes of nuclear states in the sub-nanosecond domain is presented. It is based on in-beam measurements of triple-gamma coincidences in heavy-ion fusion-evaporation reactions, performed with an array of HPGe and LaBr3:Ce detectors. The high-energy resolution HPGe detectors are used to define de-exciting cascades, while the fast LaBr3:Ce detectors are used to determine the decay time spectra of selected levels fed by these cascades. A special method to treat the time information of an array of fast detectors is employed in order to fully use the efficiency of the array. Two measurements are presented to illustrate the method: a re-determination of the known half-life T-1/2 = 0.7 ns of 7/2(+) level in Cd-107 (test experiment), and the determination of a half-life T-1/2 = 0.7 ns of the E-x = 205 keV, J(pi) = 7/2(+) level in Cd-107 (test experiment), and the determination of a half-life T-1/2 = 47 ps for the E-x = 367 keV, J(pi) = 3/2(+) state of Tl-199..

引用

页码：329 / 336

页数：8

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