Al (p,n) Si - Revision history

RichardLefferts: added goals and a few sentences

2010-09-06T14:23:57Z

added goals and a few sentences

RichardLefferts at 13:27, 6 September 2010

2010-09-06T13:27:40Z

RichardLefferts at 12:05, 6 September 2010

2010-09-06T12:05:34Z

TaposhiBiswas at 01:53, 29 August 2010

2010-08-29T01:53:41Z

TaposhiBiswas at 16:47, 28 August 2010

2010-08-28T16:47:20Z

TaposhiBiswas: New page: = ²⁷Al (p,n) ²⁷Si =

2010-08-27T00:24:55Z

New page: = 27Al (p,n) 27Si =

New page

= 27Al (p,n) 27Si =

@@ Line 32: / Line 32: @@
 <li><b>The [[Tandem | Tandem Accelerator]]:</b> Negative H<sup>-</sup> ions are accelerated to the center of the tandem, stripped of the electrons to create protons, and then accelerated through the rest of the tandem to a high energy.</li>
 <li><b>The [[Target Room]]:</b> The high energy proton beam is directed onto an aluminum foil target, hopefully creating a nuclear fusion reaction.</li>
 </ul>
@@ Line 38: / Line 39: @@
 ===Technique===
-To find the neutron threshold, you will have to do the experiment with protons of various different energies, both below and above the threshold.
+To find the neutron threshold, we measure the neutron yield as a function of proton energy. Ideally, one would observe a small but gradually (linearly?) increasing background until one reached the threshold for fusion of the proton followed by evaporation of the neutron.  This yield will then increase (linearly) with beam energy. One can fit the data to two lines and extract their intercept.
 ==Data Collection==
 ==Analysis==
 Return to [[Lab Manuals]]

← Older revision		Revision as of 13:27, 6 September 2010
Line 43:		Line 43:

	==Analysis==		==Analysis==
		+
		+	Return to [[Lab Manuals]]

@@ Line 5: / Line 5: @@
 <center><sup>27</sup>Al (p,n) <sup>27</sup>Si</center>
-In other words, protons(p) of sufficient energy incident on an <sup>27</sup>Al target will be absorbed by the atom and knock off a neutron(n) to generate <sup>27</sup>Si, where in both cases 27 indicates the atomic mass. However, this will only happen if the protons have sufficient energy.  In this experiment, you will measure the <i>neutron threshold</i>, or the energy incident protons must be accelerated to in order achieve nuclear fusion.
+In other words, protons(p) of sufficient energy incident on an <sup>27</sup>Al target will fuse with the the nucleus and then emit a neutron(n), leaving <sup>27</sup>Si, where in both cases 27 indicates the atomic mass. This will only happen if the protons have sufficient kinetic energy to supply the difference in binding energy between <sup>27</sup>Al and <sup>27</sup>Si plus the difference between p and n masses.  At the <i>neutron threshold</i> energy the neutrons leave with no kinetic energy so a detailed energy balance can be done to measure the difference in binding n or p to a <sup>26</sup>Si core.
 ==Accelerator Operation==

@@ Line 21: / Line 21: @@
 In addition to these main sections of the accelerator, you will need to be able to use the [[Ion Optics | ion optics]] in the accelerator effectively to steer and focus the beam.
-===
+===Technique===
 ==Data Collection==
 ==Analysis==

← Older revision		Revision as of 16:47, 28 August 2010
Line 1:		Line 1:
		+	==Background==

−	= <sup>27</sup>Al (p,n) <sup>27</sup>Si =	+	The shorthand for this experiment indicates the basics of the process that will take place:
		+
		+	<center><sup>27</sup>Al (p,n) <sup>27</sup>Si</center>
		+
		+	In other words, protons(p) of sufficient energy incident on an <sup>27</sup>Al target will be absorbed by the atom and knock off a neutron(n) to generate <sup>27</sup>Si, where in both cases 27 indicates the atomic mass. However, this will only happen if the protons have sufficient energy. In this experiment, you will measure the <i>neutron threshold</i>, or the energy incident protons must be accelerated to in order achieve nuclear fusion.
		+
		+	==Accelerator Operation==
		+
		+	In order to acquire sufficiently energetic protons for this experiment, you will have to learn to create and direct a proton ion beam in the tandem accelerator. There are a number of components to the accelerator, which you will need to know the function of and how they will affect the nature of the proton beam.
		+
		+	===Components===
		+
		+	<ul>
		+	<li><b>The [[Ion Source]]:</b> Negative H<sup>-</sup> are created here and accelerated at relatively low energies.</li>
		+	<li><b>The [[Tandem \| Tandem Accelerator]]:</b> Negative H<sup>-</sup> ions are accelerated to the center of the tandem, stripped of the electrons to create protons, and then accelerated through the rest of the tandem to a high energy.</li>
		+	<li><b>The [[Target Room]]:</b> The high energy proton beam is directed onto an aluminum foil target, hopefully creating a nuclear fusion reaction.</li>
		+	</ul>
		+
		+	In addition to these main sections of the accelerator, you will need to be able to use the [[Ion Optics \| ion optics]] in the accelerator effectively to steer and focus the beam.
		+
		+	===
		+
		+	==Data Collection==
		+
		+	==Analysis==