EXP1904: Reference reaction

<p>Initial form of the ⁹Li missing mass will be determined in this issue together with input parameters. All variations of the stated parameters will be reported as an individual subtask of this issue.</p>

<p>The initial parameters:</p>

<table border="1" cellpadding="1" cellspacing="1" style="width:500px;">
<tbody>
<tr>
<td style="text-align: center;"><strong>number</strong></td>
<td style="text-align: center;"><strong>parameter</strong></td>
<td style="text-align: center;"><strong>value</strong></td>
<td style="text-align: center;"><strong>unit</strong></td>
</tr>
<tr>
<td style="text-align: center;">1</td>
<td>beam energy</td>
<td>beamDet thickness: 644 micron of Si <br />
<a href="http://er.jinr.ru/develop/issues/395">issue 395</a></td>
<td> </td>
</tr>
<tr>
<td style="text-align: center;">2*</td>
<td>thin SSD calibration parameters</td>
<td>pars for 2 thin detector (<a class="icon icon-attachment" href="http://er.jinr.ru/develop/attachments/download/492/ssd_20u_2.cal" style="background-color: rgb(255, 255, 221);">ssd_20u_2.cal</a>) from <a href="http://er.jinr.ru/develop/issues/284">issue 284</a><br />
<br />
pars for 1 3 and 4 detectors from <a href="http://er.jinr.ru/develop/issues/391">issue 391</a> <br />
(<a class="icon icon-attachment" href="http://er.jinr.ru/develop/attachments/download/527/SSD_20u_1_cal.txt" style="background-color: rgb(255, 255, 221);">SSD_20u_1_cal.txt</a>,<br />
<a class="icon icon-attachment" href="http://er.jinr.ru/develop/attachments/download/529/SSD_20u_3_cal.txt" style="background-color: rgb(255, 255, 221);">SSD_20u_3_cal.txt</a><span style="background-color: rgb(255, 255, 221);"> </span><br />
<a class="icon icon-attachment" href="http://er.jinr.ru/develop/attachments/download/530/SSD_20u_4_cal.txt" style="background-color: rgb(255, 255, 221);">SSD_20u_4_cal.txt</a> )</td>
<td> </td>
</tr>
<tr>
<td style="text-align: center;">3</td>
<td>thick SSD calibration parameters</td>
<td><a href="http://er.jinr.ru/develop/issues/391">issue 391</a></td>
<td> </td>
</tr>
<tr>
<td style="text-align: center;">4</td>
<td>central DSD calibration parameters</td>
<td><a href="http://er.jinr.ru/develop/issues/391">issue 391</a></td>
<td> </td>
</tr>
<tr>
<td style="text-align: center;">5</td>
<td>thin detector front dead layer</td>
<td style="text-align: center;">not used</td>
<td>mcm</td>
</tr>
<tr>
<td style="text-align: center;">6</td>
<td>thin detector rear dead layer</td>
<td style="text-align: center;">not used</td>
<td>mcm</td>
</tr>
<tr>
<td style="text-align: center;">7</td>
<td>thick SSD front dead layer</td>
<td><a href="http://er.jinr.ru/develop/issues/391">issue 391</a></td>
<td>mcm</td>
</tr>
<tr>
<td style="text-align: center;">8</td>
<td>thin detector position</td>
<td>(-21.3,46.3,173)<br />
(-46.3,-21.3,173)<br />
(21.3,-46.3,173)<br />
(21.3,46.3,173)</td>
<td>mm</td>
</tr>
<tr>
<td style="text-align: center;">9</td>
<td>thick detector position</td>
<td>(-23.5,48.5,188)<br />
(-48.5,-23.5,188)<br />
(23.5,-48.5,188)<br />
(23.5,48.5,188)</td>
<td>mm</td>
</tr>
<tr>
<td style="text-align: center;">10</td>
<td>central DSD position</td>
<td>(0,0,323)</td>
<td>mm</td>
</tr>
<tr>
<td style="text-align: center;">11</td>
<td>target density (same pressure as for ⁷H)</td>
<td>0.0020646</td>
<td>g.cm^-3</td>
</tr>
<tr>
<td style="text-align: center;">12</td>
<td>target density, low </td>
<td>0.001005</td>
<td>g.cm^-3</td>
</tr>
<tr>
<td style="text-align: center;">13**</td>
<td>full target thickness</td>
<td>6</td>
<td>mm</td>
</tr>
<tr>
<td style="text-align: center;">14</td>
<td>target mylar window thickness</td>
<td>3.5</td>
<td>mcm</td>
</tr>
<tr>
<td style="text-align: center;">15</td>
<td>target stainless steel window thickness</td>
<td>6</td>
<td>mcm</td>
</tr>
<tr>
<td style="text-align: center;">16***</td>
<td>CsI calibration parameters</td>
<td style="text-align: center;">not used</td>
<td> </td>
</tr>
<tr>
<td style="text-align: center;">17</td>
<td>map of thickness for thin SSD</td>
<td><a href="http://er.jinr.ru/develop/issues/392">issue 392</a></td>
<td> </td>
</tr>
<tr>
<td style="text-align: center;">18</td> center;&quot;&gt;18***&lt;/td&gt;
<td>target selection</td>
<td>x*x + y*y < 9*9 (circle &lt;td&gt;mapping of 9 mm radius at the target plane)</td> strips and crystals&lt;/td&gt;
&lt;td style=&quot;text-align: center;&quot;&gt;not used&lt;/td&gt;
<td> </td>
</tr>
</tbody>
</table>

<p>* Energy deposit in the first layer of side telescopes is calculated according to the map of thickness. Calibration parameters are used exclusively for particle identification.<br />
** Target is taken as a cylinder of homogeneous thickness for the purposes of reconstruction.<br />
*** When needed, identification of ⁹Li is performed without calibration parameters using the CsI response in channel values.</p>

<p>Two expositions are at disposal:</p>

<ul>
<li>for the thin gaseous target (be10_ct_39* and be10_ct_40*)</li>
<li>for the thick gaseous target (be10_ct_*)</li>
</ul>

<p>Provide the resulting spectrum together with the mean value of the ground state in two separate comments:</p>

<ul>
<li>one spectrum from all telescopes for the thin target;</li>
<li>one spectrum from all telescopes for the thick target and four spectra for individual telescopes.</li>
</ul>