Evaluation of neutron nuclear data on platinum isotopes

Figures & data

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

	^189Pt	^190Pt	^191Pt	^192Pt	^193Pt	^194Pt	^195Pt	^196Pt	^197Pt	^198Pt
Abundances(%)	10.87h*	0.012	2.83d*	0.782	50y*	32.86	33.78	25.21	19.8915h*	7.356
Q-values (MeV)
(n, γ)	8.911	6.448	8.662	6.261	8.352	6.105	7.922	5.846	7.555	5.556
(n, p)	2.754	0.213	1.792	−0.672	0.839	−1.446	−0.320	−2.427	−1.374	−3.302
(n, α)	12.163	9.542	11.084	8.343	9.874	7.281	8.734	6.396	7.662	5.252
(n, d)	−3.198	−3.933	−4.010	−4.646	−4.708	−5.289	−5.327	−6.017	−6.048	−6.704
(n, t)	−3.815	−5.852	−4.123	−6.415	−4.649	−6.803	−5.136	−6.992	−5.606	−7.346
(n, ^3He)	−2.124	−3.046	−3.573	−4.443	−4.945	−5.739	−6.260	−7.070	−7.770	−8.487
(n, 2n)	−6.728	−8.911	−6.448	−8.662	−6.261	−8.352	−6.105	−7.922	−5.846	−7.555
(n, np)	−5.423	−6.157	−6.235	−6.870	−6.933	−7.513	−7.551	−8.242	−8.273	−8.929
(n, nα)	3.899	3.252	3.095	2.422	2.082	1.522	1.176	0.812	0.549	0.107
(n, nd)	−10.072	−12.110	−10.380	−12.672	−10.907	−13.061	−11.394	−13.249	−11.863	−13.603
(n, 3n)	−15.943	−15.639	−15.359	−15.110	−14.923	−14.613	−14.457	−14.027	−13.768	−13.401
(n, 2np)	−12.296	−14.334	−12.605	−14.897	−13.131	−15.285	−13.618	−15.473	−14.088	−15.828

*Half-lives are given for ^{189, 191, 193, 197}Pt which are unstable.

Table 2. Resolved and unresolved resonance regions.

Target nuclei	Resolved resonance	Unresolved resonance
^189Pt	–	0.3 eV–6.4 keV
^190Pt	10^−5–30.5 eV	30.5 eV–100 keV
^191Pt	–	0.7 eV–9.5 keV
^192Pt	10^−5 eV–5 keV	5–100 keV
^193Pt	–	4 eV–1.6 keV
^194Pt	10^−5 eV–1.3 keV	1.3–100 keV
^195Pt	10^−5 eV–900 eV	900 eV–100 keV
^196Pt	10^−5 eV–1.8 keV	1.8–100 keV
^197Pt	–	50 eV–53 keV
^198Pt	10^−5 eV–1.5 keV	1.5–100 keV

Figure 1. Unresolved resonance region for n + ¹⁹⁷Pt.

Figure 2. Total cross section of elemental Pt.

Table 3. Optical model parameters for neutrons.

V^0R	= −34.40 − 6.18 × 10^−2A + 3.37 × 10^−4A^2 − 6.52 × 10^−7A^3 MeV
V^1R	= 0.027
V^2R	= 1.2 × 10^−4 MeV^−1
V^3R	= 3.5 × 10^−7 MeV^−2
V^DISPR	= 94.88 MeV
Cviso	= 24.3 MeV
λR	= 1.05 × 10^− 2 + 1.63 × 10^− 4V^0R MeV^−1
W^DISPD	= 10.0 MeV
WIDD	= 12.72 − 1.54 × 10^−2A + 7.14 × 10^−5A^2 MeV
Cwiso	= 18.0 MeV
λD	= 0.0140 MeV^−1
W^DISPV	= 17.0 MeV
WIDV	= 105.05 − 14.13 × [1.0 + exp{(A − 100.21)/13.47}]^−1 MeV
V^0SO	= 5.92 + 0.003A MeV
λSO	= 0.005 MeV^−1
W^DISPSO	= −3.1 MeV
WIDSO	= 160.0 MeV
RR, D, V	= 1.21A^1/3 fm
aR, D, V	= 0.49 + 3.22 × 10^−3A − 2.07 × 10^−5A^2 + 4.47 × 10^−8A^3 fm
RSO	= (1.18 − 0.65A^−1/3)A^1/3 fm
aSO	= 0.59 fm

Note that the potential forms are given in [15]. The symbol A stands for the mass number of a nucleus.

Table 4. Coupling schemes used in the interaction between neutron and target.

Target nuclei	Coupled levels*	Deformation parameters
^189Pt	3/2^−(g.s.), 5/2^−(0.006), 7/2^−(0.238), 9/2^−(0.357)	β2 = −0.164, β4 = −0.021
^190Pt	0^+(g.s.), 2^+(0.296), 4^+(0.737), 6^+(1.288)	β2 = −0.156, β4 = −0.022
^191Pt	3/2^−(g.s.), 5/2^−(0.159), 7/2^−(0.488)	β2 = −0.156, β4 = −0.029
^192Pt	0^+(g.s.), 2^+(0.317), 4^+(0.785), 6^+(1.365)	β2 = −0.156, β4 = −0.029
^193Pt	1/2^−(g.s.), 3/2^−(0.002), 5/2^−(0.014), 7/2^−(0.599)	β2 = −0.156, β4 = −0.037
^194Pt	0^+(g.s.), 2^+(0.328), 4^+(0.811), 6^+(1.412)	β2 = −0.154, β4 = −0.046
^195Pt	1/2^−(g.s.), 3/2^−(0.099), 5/2^−(0.130), 7/2^−(0.450)	β2 = −0.148, β4 = −0.037
^196Pt	0^+(g.s.), 2^+(0.356), 4^+(0.877), 6^+(1.526)	β2 = −0.142, β4 = −0.049
^197Pt	1/2^−(g.s.), 3/2^−(0.072), 5/2^−(0.273), 7/2^−(0.483)	β2 = −0.148, β4 = −0.029
^198Pt	0^+(g.s.), 2^+(0.407), 4^+(0.985), 6^+(1.714)	β2 = −0.119, β4 = −0.042

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

Table 5. Level density parameters for each nucleus.

	a(^*)	Δ	Esh	T	E0	Em	E^highestlevel
Nuclei	(MeV^−1)	(MeV)	(MeV)	(MeV)	(MeV)	(MeV)	(MeV)
^199Pt	23.228	0.851	−3.486	0.652	−1.577	7.628	0.474
^198Pt	23.131	1.706	−3.134	0.603	−0.154	7.247	1.944
^197Pt	23.033	0.855	−2.496	0.591	−1.093	6.292	0.965
^196Pt	22.936	1.714	−2.151	0.583	−0.239	7.037	1.992
^195Pt	22.839	0.859	−1.456	0.585	−1.366	6.400	0.875
^194Pt	22.741	1.723	−1.159	0.545	−0.056	6.437	1.992
^193Pt	22.644	0.864	−0.352	0.557	−1.327	6.020	0.692
^192Pt	22.546	1.732	−0.214	0.512	0.108	5.960	1.823
^191Pt	22.448	0.868	0.574	0.531	−1.227	5.657	0.613
^190Pt	22.351	1.741	0.575	0.473	0.405	5.356	1.915
^189Pt	22.253	0.873	1.275	0.491	−0.853	4.971	0.609
^188Pt	22.155	1.750	1.222	0.456	0.476	5.164	1.769
^187Pt	22.057	0.878	1.879	0.512	−1.272	5.494	0.621
^198Ir	23.131	0.000	−2.701	0.473	−0.605	2.953	0.116
^197Ir	23.033	0.855	−2.037	0.534	−0.541	5.142	0.654
^196Ir	22.936	0.000	−1.816	0.421	−0.373	2.287	0.522
^195Ir	22.839	0.859	−1.258	0.508	−0.450	4.793	1.107
^194Ir	22.741	0.000	−1.012	0.524	−1.561	4.307	0.524
^193Ir	22.644	0.864	−0.506	0.536	−0.987	5.523	1.038
^192Ir	22.546	0.000	−0.035	0.551	−2.203	5.097	0.320
^191Ir	22.448	0.868	0.290	0.525	−1.056	5.461	0.832
^190Ir	22.351	0.000	0.690	0.517	−1.927	4.514	0.386
^189Ir	22.253	0.873	0.866	0.504	−0.915	5.143	0.918
^188Ir	22.155	0.000	1.083	0.400	−0.682	2.450	0.354
^187Ir	22.057	0.878	1.431	0.522	−1.277	5.589	0.486
^196Os	22.936	1.714	−1.535	0.562	−0.197	6.749	0.300
^195Os	22.839	0.859	−1.132	0.435	0.242	3.509	0.439
^194Os	22.741	1.723	−0.995	0.553	−0.215	6.651	0.696
^193Os	22.644	0.864	−0.622	0.539	−0.998	5.571	0.456
^192Os	22.546	1.732	−0.347	0.516	0.102	6.001	1.895
^191Os	22.448	0.868	0.159	0.560	−1.500	6.171	0.748
^190Os	22.351	1.741	0.299	0.520	−0.098	6.205	1.824
^189Os	22.253	0.873	0.718	0.535	−1.280	5.726	0.736
^188Os	22.155	1.750	0.702	0.492	0.188	5.709	1.957
^187Os	22.057	0.878	0.987	0.532	−1.271	5.673	0.727
^186Os	21.959	1.760	1.013	0.481	0.285	5.532	2.031
^185Os	21.861	0.882	1.231	0.520	−1.144	5.454	0.729

Figure 3. Gamma-ray spectrum from n + ¹⁹⁴Pt at 500 keV.

Table 6. E1 parameters for platinum isotopes.

	$E_0\left(\mathrm{MeV}\right)$	${\Gamma }_0\left(\mathrm{MeV}\right)$	${\sigma }_0\left(\mathrm{mb}\right)$
GDR	13.72	4.99	512.00
Pygmy	5.50	2.40	2.50
Correction	1.40	1.60	0.50

Table 7. Gamma-ray strength functions for s-wave neutron in units of 10⁻⁴.

Compound nuclei	Present work	Mughabghab [5]
^190Pt	1894	–
^191Pt	17.96^*	–
^192Pt	820.2	–
^193Pt	15.18	19.1 ± 0.9
^194Pt	153.9	–
^195Pt	8.030	8.78 ± 1.88
^196Pt	53.55^*	63.5 ± 11.7
^197Pt	3.537	4.06 ± 1.00
^198Pt	17.10	–
^199Pt	1.452^*	–

^* Renormalised, as mentioned in the text.

Table 8. Pre-equilibrium parameters.

	C0		Knockout	Pickup
Target nuclei	(n, n′)	(n, p)	for (n, α)	for (n, α)
^189Pt	1.00	1.00	1.00	1.00
^190Pt	0.90	1.00	1.50	1.50
^191Pt	1.00	1.00	1.50	1.50
^192Pt	0.85	1.00	3.00	3.00
^193Pt	1.00	1.00	3.00	3.00
^194Pt	1.00	0.95	5.00	5.00
^195Pt	1.00	1.00	5.00	5.00
^196Pt	1.00	0.80	8.00	8.00
^197Pt	1.00	1.00	8.00	8.00
^198Pt	1.10	1.00	8.00	8.00

Figure 4. Capture cross section of ¹⁹²Pt.

Figure 5. Capture cross section of ¹⁹⁴Pt.

Figure 6. Capture cross section of ¹⁹⁵Pt.

Figure 7. Capture cross section of ¹⁹⁶Pt.

Figure 8. Capture cross section of ¹⁹⁸Pt.

Figure 9. Maxwellian-averaged capture cross section of ¹⁹⁸Pt.

Figure 10. Maxwellian-averaged capture cross section of ¹⁹⁶Pt.

Figure 11. Maxwellian-averaged capture cross section of ¹⁹⁰Pt.

Figure 12. ¹⁹⁰Pt(n, 2n)¹⁸⁹Pt reaction cross section.

Figure 13. ¹⁹²Pt(n, 2n)¹⁹¹Pt reaction cross section.

Figure 14. ¹⁹⁴Pt(n, 2n)¹⁹³Pt reaction cross section.

Figure 15. ¹⁹⁵Pt(n, 2n)¹⁹⁴Pt reaction cross section.

Figure 16. ¹⁹⁶Pt(n, 2n)¹⁹⁵Pt reaction cross section.

Figure 17. ¹⁹⁸Pt(n, 2n)¹⁹⁷Pt reaction cross section.

Figure 18. ^natPt(n, 2n) reaction cross section.

Figure 19. ¹⁹⁴Pt(n, p)^194gIr (T_1/2 = 19.28 h) reaction cross section.

Figure 20. ¹⁹⁴Pt(n, p)^194mIr (T_1/2 = 31.85 ms) reaction cross section.

Figure 21. ¹⁹⁵Pt(n, p)^195gIr (T_1/2 = 2.5 h) reaction cross section.

Figure 22. ¹⁹⁵Pt(n, p)^195mIr (T_1/2 = 3.8 h) reaction cross section.

Figure 23. ¹⁹⁶Pt(n, p)^196gIr (T_1/2 = 52 s) reaction cross section.

Figure 24. ¹⁹⁶Pt(n, p)^196mIr (T_1/2 = 1.40 h) reaction cross section.

Figure 25. ¹⁹⁴Pt(n, α)¹⁹¹Os reaction cross section.

Figure 26. ¹⁹⁶Pt(n, α)¹⁹³Os reaction cross section.

Shibata K. Evaluation of neutron nuclear data on tantalum isotopes. J Nucl Sci Technol. 2016;53:957–967.

 Web of Science ®Google Scholar

Mughabghab SF. Atlas of neutron resonances, resonance parameters and thermal cross sections Z = 1–100. Amsterdam: Elsevier; 2006.

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