BO-08-22-13

Ba reactions

naturally occurring Isotope and their abundance

[math]{138 \atop\; }Ba(72%), {137 \atop\; }Ba(11%),{136 \atop\; }Ba (7.9%), {135 \atop\; }Ba(7%), {134 \atop\; }Ba(2%)[/math]

Single neutron knockout

Ba-137 -> Ba-136* -> Ba-136 + gamma

[math]{137 \atop\; }Ba (\gamma,n){136 \atop \; }Ba^*[/math]

Below is a table of the photon energy and relative intensities that are given off as Ba-136 de-excites back to the ground state.

  163.920 2 	     31.25 %	  0.0512250
  315.5 5  ?	      0.024 % 22 	  8E-5 7 
  732.46 2 	      0.012 % 11 	  9E-5 8 
  818.514 12 	     99.585 % 12 	  0.81512 10 
 1048.073 20 	     99.819 % 23 	  1.04618 24 
 1550.96 2 	      0.013 % 12 	  2.0E-4 19 

Gamma Coincidence Data: For each gamma, the list of gammas in coincidence is given. If experimentally known, an estimate of the average time interval (in seconds) between both gammas is given

E(γ) Coincidence

  163.920	315.5, 732.46 (1.01E-12), 818.514 (2.94E-12), 1048.073, 1550.96 (1.01E-12)
  315.5	163.920, 732.46 (1.01E-12), 818.514 (2.94E-12), 1550.96 (1.01E-12)
  732.46	163.920 (1.01E-12), 315.5 (1.01E-12), 818.514 (1.93E-12)
  818.514	163.920 (2.94E-12), 315.5 (2.94E-12), 732.46 (1.93E-12), 1048.073 (1.93E-12)
 1048.073	163.920, 818.514 (1.93E-12)
 1550.96	163.920 (1.01E-12), 315.5 (1.01E-12)

Neutron Separation Energy= Energy needed to liberate a neutron from the Nucleus

=[math]S_n = B({138 \atop 56} Au_{118})-B({{136} \atop 55} Au_{117})[/math]

[math]\left [79(1.007825 u) + 118 (1.008665 u) - 196.97 u\right ] \frac{931.5 MeV}{u} -\left [79(1.007825 u) + 117 (1.008665 u) - 195.967 u\right ] \frac{931.5 MeV}{u}[/math]

[math]=\left [(1.008665 u) - 196.9665516 u+ 195.9665513 u\right ] \frac{931.5 MeV}{u} = 5.3 MeV[/math]

Single proton knockout

[math]{137 \atop\; }Ba (\gamma,p){136 \atop \; }Cs[/math]

Cs-136

1.2 MeV

Intense lines

Energy(keV)	Intensity(rel)
153.246 4	5.75
163.920 2	3.39
176.602 4	10.0
273.646 8	11.1
340.547 8	42.2
818.514 12	99.704
1048.073 20	80
1235.362 23	20.0

Coincidences

1048 line

1048.073 66.881 (1.60E-9), 86.36, 109.681, 153.246, 163.920, 166.576 (4.71E-9), 176.602, 187.285, 233.5 (1.60E-9), 273.646, 302.4, 319.911, 340.547, 490.0, 507.188, 818.514

Run List

Run	Description
5792	Ba-133 source, TDC not getting hits
5820	empty, only counting with detector 180-3 (no TDC) 8 min 18 sec long, 396 Hz
5821	Ba-132, only counting with detector 180-3 (no TDC) 6 min 1 sec long, Hz
5822	Ba-132 + Al rod 130100-012, only counting with detector 180-3 (no TDC) 10 min 56 sec long, 459 Hz
5823	empty rod 130100-011, only counting with detector 180-3 (no TDC) 11 min 49 sec long, 439 Hz
5889	Ba-133 source 129790 1.2 uCi, only counting with detector 180-3, TDC is back (someone changed the NIM->ECL connector polarity) 2 min 44 sec long, 1944 Hz, Det B HV OFF,
5900	Ba-133 source 129789 0.12 uCi, only counting with detector 180-3, 10 min 57 sec long, 378 Hz, Det B HV OFF,
5902	Ba-132 + Al rod 130100-012, only counting with detector 180-3 9 min 56sec long, 191 Hz
5908	Ba-133 0.1 uCi source # 129789 , Using both detectors in OR mode
5909	Ba-133 0.1 uCi source # 129789 , Using both detectors in OR mode , changed Det 180-2 threshold from 18 to 10 mV, 8 min 30 sec long, 783 Hz
5910	Ba-132 + Al rod 130100-012, Using both detectors in OR mode, 33 min 5 sec long, Hz
5912	Ba-133 0.1 uCi source # 129789 , Using both detectors OR mode , 4 min 21 sec long, 809 Hz
5913	Na-22 0.1 uCi source # 129741, Using both detectors OR mode, 4 min 8 sec long, 656 Hz
5914	Ba-132 + Al rod 130100-012, Using both detectors OR mode, 13 min 17 sec long, 470 Hz
5915	Ba-132 + Al rod 130100-012, Using both detectors AND mode, min sec long, Hz

PAA_8-22-13