The asset of ultra-fast digitizers for positron-lifetime spectroscopy

被引：148

作者：

Becvár, F ^{[1
]}

Cízek, J ^{[1
]}

Procházka, I ^{[1
]}

Janotová, J ^{[1
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, Dept Low Temp Phys, CZ-18000 Prague 8, Czech Republic

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2005年 / 539卷 / 1-2期

关键词：

positron annihilation in condensed matter; positron-lifetime spectroscopy; BaF2; scintillators; fast digitizers; timing resolution power; photomultipliers;

D O I：

10.1016/j.nima.2004.09.031

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A spectrometer for positron-lifetime measurements assembled from two BaF2 scintillation detectors and two 8-bit, 4GS s(-1) digitizes in a master-slave configuration is described in detail. We report the results of comparative testing measurements of the lifetime of positrons annihilating in alpha-Fe using this setup and a setup formed by the same pair of detectors working in conjunction with analog electronics modules. The data from these measurements demonstrate for the first time that replacing the analog electronics chain by fast digitizers leads to a substantial improvement of the precision in positron-lifetime measurements. A record timing resolution of 131-136 ps has been achieved with the described spectrometer at coincidence counting rate comparable or virtually equal to that obtained with the fast-fast setup. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：372 / 385

页数：14

共 10 条

[1]

*ACQ, 2003, US MAN FAM 8 BIT DIG

[2]

Becvár F, 2000, NUCL INSTRUM METH A, V443, P557, DOI 10.1016/S0168-9002(99)01156-0

[3] Thermal stability of ultrafine grained copper -: art. no. 094106 [J].

Cízek, J ;

Procházka, I ;

Cieslar, M ;

Kuzel, R ;

Kuriplach, J ;

Chmelík, F ;

Stulíková, I ;

Becvár, F ;

Melikhova, O ;

Islamgaliev, RK .

PHYSICAL REVIEW B, 2002, 65 (09) :1-16

[4] BARIUM FLUORIDE INORGANIC SCINTILLATOR FOR SUBNANOSECOND TIMING [J].

LAVAL, M ;

MOSZYNSKI, M ;

ALLEMAND, R ;

CORMORECHE, E ;

GUINET, P ;

ODRU, R ;

VACHER, J .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH, 1983, 206 (1-2) :169-176

[5] Successful implementation of fast preamplifiers in a positron lifetime spectrometer [J].

Nissilä, J ;

Rytsölä, K ;

Saarinen, K ;

Hautojärvi, P .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2002, 481 (1-3) :548-555

[6] Application of maximum-likelihood method to decomposition of positron-lifetime spectra to finite number of components [J].

Prochazka, I ;

Novotny, I ;

Becvar, F .

POSITRON ANNIHILATION: ICPA-11 - PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON POSITRON ANNIHILATION, KANSAS CITY, MISSOURI, USA, MAY 1997, 1997, 255-2 :772-774

[7] Digital measurement of positron lifetime [J].

Rytsölä, K ;

Nissilä, J ;

Kokkonen, J ;

Laakso, A ;

Aavikko, R ;

Saarinen, K .

APPLIED SURFACE SCIENCE, 2002, 194 (1-4) :260-263

[8] Direct measurement of the parapositronium lifetime in α-SiO2 -: art. no. 193401 [J].

Saito, H ;

Hyodo, T .

PHYSICAL REVIEW LETTERS, 2003, 90 (19) :4

[9] Positron lifetime spectrometer for the measurement of parapositronium lifetime in solids [J].

Saito, H ;

Hyodo, T .

POSITRON ANNIHILATION, ICPA-13, PROCEEDINGS, 2004, 445-6 :457-461

[10] A new positron lifetime spectrometer using a fast digital oscilloscope and BaF2 scintillators [J].

Saito, H ;

Nagashima, Y ;

Kurihara, T ;

Hyodo, T .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2002, 487 (03) :612-617

← 1 →