Evaluation of neutron nuclear data on antimony isotopes

Figures & data

Table 1. Isotopic abundances and reaction Q-values of antimony isotopes.

	^121Sb	^123Sb	^124Sb	^125Sb	^126Sb
Abundances(%)	57.21	42.79	60.2 d^*	2.75856 y^*	12.35 d^*
Q-values (MeV)
(n, γ)	6.806	6.467	8.707	6.214	8.373
(n, p)	0.391	−0.621	1.399	−1.575	0.404
(n, α)	3.282	2.157	3.867	0.968	2.674
(n, d)	−3.554	−4.343	−4.864	−5.083	−5.564
(n, t)	−6.405	−6.899	−4.553	−7.314	−5.040
(n,^3He)	−8.751	−10.243	−10.903	−11.689	−12.382
(n, 2n)	−9.242	−8.965	−6.467	−8.707	−6.214
(n, np)	−5.779	−6.567	−7.089	−7.308	−7.789
(n, nα)	−3.075	−3.945	−4.310	−4.839	−5.246
(n, nd)	−12.662	−13.156	−10.810	−13.571	−11.297
(n, 3n)	−16.260	−15.772	−15.433	−15.174	−14.921

^*Half-lives are given for ¹²⁴Sb, ¹²⁵Sb, and ¹²⁶Sb which are unstable.

Table 2. Resolved and unresolved resonance regions.

Target nuclei	Resolved resonance	Unresolved resonance
^121Sb	10^−5 eV–2.0 keV	2.0 keV–100 keV
^123Sb	10^−5 eV–2.5 keV	2.5 keV–300 keV
^124Sb	–	10 eV–100 keV
^125Sb	–	40 eV–400 keV
^126Sb	–	30 eV–300 keV

Table 3. Calculated thermal capture cross sections.

Target nuclei	Calculations	Mughabghab [16]
^121Sb	6.319 b	5.77 ± 0.11 b
^123Sb	2.946 b	3.94 ± 0.12 b
^124Sb	8.556 b	17.4 ± 2.8 b^*
^125Sb	1.333 b	–
^126Sb	2.673 b	–

^*Considered as a maximum value [17].

Figure 1. Total cross sections in the unresolved resonance region.

Figure 2. Total cross section of elemental Sb.

Figure 3. Nonelastic cross section of elemental Sb.

Table 4. Coupling schemes used in the interaction between neutrons and targets.

	Coupled	Deformation
Target nuclei	levels^*	parameters
^121Sb	5/2^+(g.s.), 7/2^+(1.0240)	β2 = −0.1075
^123Sb	7/2^+(g.s.), 9/2^+(1.0302)	β2 = −0.0953
^124Sb	No coupling
^125Sb	7/2^+(g.s.), 9/2^+(1.0673)	β2 = −0.0953
^126Sb	No coupling

^*The number in the parentheses indicates the excitation energy in MeV.

Table 5. Level density parameters for each nucleus.

	a(*)	Δ		T	E0	Em
Nuclei	1/MeV	MeV	MeV	MeV	MeV	MeV	MeV
^127Sb	15.073	1.065	−1.601	0.710	−0.225	5.924	2.514
^126Sb	15.534	0.000	−0.617	0.741	−2.251	6.198	0.128
^125Sb	14.870	1.073	−0.068	0.553	0.610	4.053	2.299
^124Sb	14.872	0.000	0.763	0.688	−1.937	5.528	0.643
^123Sb	14.667	1.082	1.092	0.594	0.036	5.016	1.773
^122Sb	14.721	0.000	1.681	0.610	−1.394	4.451	0.605
^121Sb	14.463	1.091	1.847	0.621	−0.375	5.680	1.659
^120Sb	14.908	0.000	2.186	0.533	−0.900	3.433	0.842
^119Sb	14.259	1.100	2.043	0.621	−0.368	5.683	1.660
^126Sn	15.615	2.138	−2.600	0.800	0.152	8.327	2.795
^125Sn	16.177	1.073	−1.437	0.622	0.148	5.007	0.855
^124Sn	15.404	2.155	−0.998	0.704	0.534	7.380	2.879
^123Sn	15.969	1.082	−0.017	0.714	−1.324	7.311	1.301
^122Sn	15.193	2.173	0.164	0.629	0.927	6.532	3.036
^121Sn	14.630	1.091	0.971	0.629	−0.241	5.555	1.403
^120Sn	14.981	2.191	0.887	0.640	0.657	6.955	2.800
^119Sn	14.223	1.100	1.470	0.652	−0.479	5.977	1.572
^124In	15.326	0.000	−0.387	0.733	−2.180	6.059	0.243
^123In	14.667	1.082	0.204	0.520	0.800	3.642	2.186
^122In	15.117	0.000	0.977	0.559	−0.857	3.517	0.229
^121In	14.463	1.091	1.390	0.614	−0.170	5.389	1.504
^120In	14.908	0.000	1.930	0.635	−1.806	5.074	0.070
^119In	14.259	1.100	2.153	0.543	0.296	4.453	1.921
^118In	14.699	0.000	2.548	0.535	−0.957	3.507	0.200
^117In	14.055	1.109	2.519	0.563	0.097	4.820	1.713

Table 6. Gamma-ray strength functions for s-wave neutrons in units of 10⁻⁴.

Compound	Present
nuclei	work	Mughabghab [16]	JENDL-4.0
^122Sb	71.62	90.2 ± 15.7	54.5
^124Sb	31.89	40.6 ± 4.0	24.2
^125Sb^*	109.66	–	197.2
^126Sb^*	16.60	–	52.5
^127Sb^*	34.10	–	34.1

^*Calculated from Equation (12(12) ).

Table 7. Preequilibrium parameters used in the present work.

Target nuclei
^121Sb	180	1.0	1.0
^123Sb	180	1.0	1.0
^124Sb	180	1.0	1.0
^125Sb	180	1.0	1.0
^126Sb	180	1.0	1.0

Figure 4. Radiative capture cross section of ¹²¹Sb.

Figure 5. Radiative capture cross section of ¹²³Sb.

Figure 6. Radiative capture cross section of elemental Sb.

Figure 7. Radiative capture cross sections of ^{124, 125, 126}Sb.

Figure 8. ¹²¹Sb(n, 2n)¹²⁰Sb reaction cross section.

Figure 9. ¹²¹Sb(n, 2n)^120gSb reaction cross section.

Figure 10. ¹²¹Sb(n, 2n)^120mSb reaction cross section.

Figure 11. ¹²³Sb(n, 2n)¹²²Sb reaction cross section.

Figure 12. ¹²³Sb(n, 2n)^122gSb reaction cross section.

Figure 13. ¹²³Sb(n, 2n)^122mSb reaction cross section.

Figure 14. ¹²¹Sb(n, p)^121gSn reaction cross section.

Figure 15. ¹²³Sb(n, p)¹²³Sn reaction cross section.

Figure 16. ¹²³Sb(n, p)^123gSn reaction cross section.

Figure 17. ¹²³Sb(n, p)^123mSn reaction cross section.

Figure 18. ¹²¹Sb(n, α)¹¹⁸In reaction cross section.

Figure 19. ¹²³Sb(n, α)¹²⁰In reaction cross section.

Figure 20. Neutron emission spectra for elemental Sb at 14.1 MeV.

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