Side feeding patterns and nuclear lifetime determinations by the Doppler shift attenuation method in (α,nγ) reactions

被引：16

作者：

Mihai, C. ^{[1
]}

Pasternak, A. A. ^{[3
]}

Filipescu, D. ^{[1
]}

Ivascu, M. ^{[1
]}

Bucurescu, D. ^{[1
]}

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

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

Deleanu, D. ^{[1
]}

Ghita, D. ^{[1
]}

Glodariu, T. ^{[1
]}

Lobach, Yu. N. ^{[2
]}

Marginean, N. ^{[1
]}

Marginean, R. ^{[1
]}

Negret, A. ^{[1
]}

Pascu, S. ^{[1
]}

Sava, T. ^{[1
]}

Stroe, L. ^{[1
]}

Suliman, G. ^{[1
]}

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

机构：

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

[2] Inst Nucl Res UAS, UA-252028 Kiev, Ukraine

[3] AF Ioffe Phys Tech Inst, Cyclotron Lab, RV-194021 St Petersburg, Russia

来源：

PHYSICAL REVIEW C | 2010年 / 81卷 / 03期

关键词：

DIPOLE BANDS; PARITY BANDS; YRAST BAND; PROBABILITIES; STATES;

D O I：

10.1103/PhysRevC.81.034314

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：

gamma rays were measured at several angles in both singles and coincidence mode in the Sn-119(alpha, n gamma)Te-122 reaction at 15 MeV on a thick target. Lifetimes of excited states in Te-122 were determined from a Monte Carlo Doppler shift attenuation method (DSAM) analysis of the Doppler broadened lines shapes of gamma rays de-exciting the levels. A comparison of several deduced lifetimes with recent results obtained with the (n, n') reaction allowed us to validate the choice of a parameter used to calculate the contribution of the side feeding times. The ingredients of the DSAM line-shape analysis (stopping power, description of instrumental line shapes, and side feeding evaluation) are presented in some detail. It is concluded that with proper treatment of side feeding, a DSAM line-shape analysis of peaks in singles or coincidence spectra obtained following the (alpha, n gamma) reaction is able to provide rather accurate values for the lifetimes of levels with low and medium spins.

引用

页数：21

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