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AN IN-BEAM TIME-GATED MÖSSBAUER EXPERIMENT
E. Vapirev, E. Dafni, H. Mahnke, M. Rafailovich, P. Kamenov, G. Sprouse
To cite this version:
E. Vapirev, E. Dafni, H. Mahnke, M. Rafailovich, P. Kamenov, et al.. AN IN-BEAM TIME-GATED MÖSSBAUER EXPERIMENT. Journal de Physique Colloques, 1980, 41 (C1), pp.C1-473-C1-474.
�10.1051/jphyscol:19801186�. �jpa-00219675�
JOURNAL DE PHYSIQUE Colloque C1, supplt!ment au n O 1 , Tome 41, janvier 1980, page C1-473
AN IN-BEAM T I E - W E D M~SSBAUER EXPERIENT
i -k
+
E. Vapirev, E. Dafni ,
w.
s e x , M.H. Rafailovich,
P . S . Kamenov, and G.D. sprouse Sofia University, Bulgaria.+
SUNY a t Stony Brook, USA.x Gn leave from Hahn-Meitner Inst., Berlin, W - G e m y . Supported i n part by the NSF, USA.
Siace the fundamental wori; of Lynch, Holland and ~amerrneih
111,
a number of works were reported on Mossbauer sime ex4 periments 12-12].
C l a s s i c a l me c.:iods were developed t o explain %he experiments [1,4].Later the quantum mechanical ax2roach [I?) confirmed the a p p l i c a b i l i t y of the class3 c a l approach. In general cilere i s a good agreement between theory and experiment f o r the cases of "time f i l t e r i n g " [7]and transmission spectra
PI.
Obvious a e a i a t i - ons f o r - h e experiments on time dependen- ce of resonance s c a t t e r i n g cannot be ex- plained a t presentb'j
and f u r t h e r i n v e s t igations a r e necessary.
Por a reasonable r a t i o of r e a l t o ran- dom coincidences one h a s t o use very weak sources ( yCi) and hence the experiments have t o be long. If a pulsed beam from an accalerator with a c e r t a i n frequency, e.g.
m R D E 3 X T . A pulsed beam from the Stony .brook F N tandem was used t o e x c i t e the re- konance l e v e l i n 5 7 ~ e i n the r e a c t i o n
P6p.@,p)57~e. The deutrons, 7 MeV,. 15 na, kere directed on a Sf.lstainless s t e e l (SS)
target. The pulses of width 4 ns followed a t a mepetition r a t e of 1 MHz;. Thin Nal
(TI) c r y s t a l was used t o d e t e c t the 14.4 .keV gamma rays. The experimental arrange-
.merit i s shown on fig.?. A l l events 15 ns, a f t e r the ppompt peak were counted. The exponential decay curve f r o m the TAC was s p l i t i n t o 8 time i n t e r v a l s , so 8 veloci-
%y s p e c t r a were taken simultaneously. The
"in-beam" time resolusion was 10 ns,
1 U z , i s used t o e x c i t e the Mossbauer l e i . Pig. I
v e l , it i s equivalent i n a wag t o have E(ESUUPS. Fig. 2 shows the ME spectra
for.
10 6 c/s i n one of thewdetectors"in a con- the 8 time i n t e r v a l s . The s o l i d l i n e s a r e ventional coincidence s e t up. The necessai the t h e o r e t i c a l calculations [q]. Po get:
r y s t a t i s t i c can-be achieved i n much s h o r t e r (hours), period.
Previous i n beam Mossbauer experiments b2-161 indicate that. i n metialic t a r g e t s
the r e c o i l l e s s f r a c t i o n i s almost unchen- ged aad t h a t the "cooling d3wnV time is much s h o r t e r than the l i f e time o f , the .isomer level.
b e t t e r agreement we had to%htroduck a Gak$:
a i a n broadening i n the SS 8ource i l 6 ] .
$he l i f e t i m e of t h e 136 key. s t a t e (appro&
40 w).. ximi3
ao3.
taken : i n t o acqount., ,
I@CUSSI~?TC he e*riaen@. confirroed:.f;he .- .
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19801186
experiments on development in time of spectra, These experiments are the only cases in which time dependent effects ori- ginating from. the, quantum ,mechanical na- ture of the decay process have been ob- served.
SUM OF 411
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' P.s~~s, P&S. Hev. ~ett. 5,432:(1960).
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Proc, Part
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[8j~.Kamenov, E.Vapirev,K,Bourin,B.Slavov, Ts~Bonchev,B.A.Alicov,R.R.Usmanov,T.M.
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i ~ d n o v , ~ u l ~ . ~.~hyk.3,3(1976).
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