Subject: Seminar Hass
Date: Mon, 15 Jun 1998 12:22:16 +0200 (MET-DST)
From: <WALTERKU@airk.rad.univie.ac.at>
To: IRK@airk.rad.univie.ac.at
CC: WALTERKU@airk.rad.univie.ac.at

Ina,

Das Seminar von Michael Hass soll am Montag, den 6. Juli 1998 um
11:OO Uhr stattfinden. Untenstehend das Abstrakt, was Du hoffentlich
entziffern kannst.

Servus,
         Walter

From:   IN%"Michael.Hass@cern.ch"  "Michael Hass" 26-MAY-1998 15:30:47.12
To:     IN%"walterku@Pap.UniVie.AC.AT"
CC:
Subj:   abstract for my talk

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Date: Tue, 26 May 1998 15:30:27 +0200
From: Michael Hass <Michael.Hass@cern.ch>
Subject: abstract for my talk
To: walterku@Pap.UniVie.AC.AT
Message-id: <199805261330.PAA120396@rsplus03.cern.ch>
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%\SubmittingPersonSurname{Weissman}
%\SubmittingPersonGivenName{Leonid}
%\SubmittingPersonEmail{fnhass@wis.weizmann.ac.il}
%\SubmittingPersonAffil{Dept. of Particle Physics, The Weizmann Institute}

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\begin{document}
\centerline{\large \bf MEASUREMENT OF THE $^7$Be(p,$\gamma$)$^8$B CROSS SECTION}
\centerline{ \large \bf WITH AN IMPLANTED $^7$Be TARGET.}
\vspace {0.4 cm}
\centerline{\small M. Hass$^1$, C. Broude$^1$, V. Fedoseev$^2$,
G. Goldring$^1$, G. Huber$^3$, J. Lettry$^4$,}
\centerline{ V. Mishin$^2$, H. Ravn$^4$, V. Sebastian$^3$ and L. Weissman$^1$}
\centerline{\rm \small 1. Weizmann Institute of Science, Rehovot, 2. Institute of spectroscopy, Troitzk}
\centerline{\rm \small 3. Johannes Gutenberg University, Institute of Physics, Mainz;
 4. ISOLDE, CERN CH-1211 Geneva}
\centerline{\rm \small and the ISOLDE collaboration}

%\begin{abstract}
\vspace{0.8 cm}
\footnotesize
We report the first result of a new measurement of the $^7$Be(p,$\gamma$)$^8$B cross section using a novel scheme which features a uniformly
scanned particle beam larger than the implanted target size$^{1,2}$.
This procedure  overcomes some of the recognized experimental
uncertainties of previous measurements$^3$. The $^7$Be target was prepared at ISOLDE (CERN) by direct implantation
of a radioactive $^7$Be beam into a Cu substrate using
 a new laser ionization source.
A test target of low intensity, but sufficient to perform the measurement of the  cross-section at one energy of E$_p$=1.2 MeV, was used.
The measurement was carried out at the 3 MV Van-de-Graaf accelerator at the Weizmann
Institute. The use of the  Cu substrate avoids the issue of backscattering of reaction products$^2$ out of the target, which now appears to have caused additional uncertainty in
previous experiments. The cross section of the $^7$Li(d,p)$^8$Li reaction, of major importance for calibrating the $^7$Be(p,$\gamma$)$^8$B, was determined using the same apparatus to be 155 mb at the top of the 776 keV resonance. The result of the present
 S$_{17}$(E$_p$=1.2 MeV) = 22.5$\pm$2.5 eV-barn,  within experimental errors of previous measurements$^3$.
We expect to have more intense targets in the near future with prospects of improved measurements and reduced errors.
\vspace{0.5 cm}
References:\\
(1) L.Weissman, M.Hass and V. Popov, Nucl. Inst. Meth. {\bf A400}, 409 (1997).\\
(2) L.Weissman, C. Broude, G. Goldring, R. Hadar, M. Hass, F. Schwamm and
M. Shaanan,\\
 Nuclear Physics A (in press).\\
(3) B.W. Filippone, A.J. Elwyn, C.N. Davis and D.D. Koetke, Phys. Rev. {\bf C28},
2222 (1983); F. Hammachi et al., Phys. Rev. Lett. {\bf 80}, 928 (1998); E.G. Adelberger et. al., Rev. Mod. Phys. (in press).
%\end{abstract}

\end{document}