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Lifetime measurement of the first excited state of Be-7 using the Doppler shift attenuation method applied to an exothermic nuclear reaction

Title
Lifetime measurement of the first excited state of Be-7 using the Doppler shift attenuation method applied to an exothermic nuclear reaction
Authors
Kim, JHLee, CSKwon, YKKim, JYHuh, JYMoon, JYLee, JHKim, JCYoun, MKim, ICPark, JHKim, JSKim, DKHahn, KI
Ewha Authors
한인식
SCOPUS Author ID
한인식scopus
Issue Date
2002
Journal Title
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
ISSN
0374-4884JCR Link
Citation
vol. 40, no. 5, pp. 802 - 806
Keywords
lifetimeDoppler shift attenuation methodCompton-suppressed germanium gamma-ray detectorsexothermic
Publisher
KOREAN PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS; KCI WOS scopus
Abstract
The lifetime of the first excited state of Be-7 (E-x = 0.429 MeV; J(pi) = 1/2(-)) was measured by mean of the Doppler shift attenuation method. An exothermic B-10(rho,alphagamma) Be-7 nuclear reaction was used to populate 7 Be using 2-MeV protons delivered from the Tandetron accelerator at Seoul National University. Two Compton-suppressed germanium gamma-ray detectors were used to reduce the Compton background around the 429-keV photopeak. A Monte Carlo simulation code specific to the present exothermic reaction kinematics was developed in order to predict the velocity history of a recoiled nucleus as a function of time, The mean lifetime of the first excited state of Be-7 has been deduced to be 169+/-51 fs. Despite the nature of the exothermic reaction, which makes assessment of the velocity distribution difficult especially for a backward recoiled nucleus, our experimental value is in fair agreement with the adopted value of 192+/-25 fs, obtained from the endothermic Li-7(rho,ngamma) Be-7 nuclear reaction.
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사범대학 > 과학교육과 > Journal papers
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