Skip to content
Jakub Skowronski

Nuclear data explorer · compound nucleus

172Tm

172Tm is formed when 171Tm + n fuse. Its levels just above each threshold are the resonances that set those reactions' rates.

Channels and what has been measured

Every EXFOR reaction that forms 172Tm: entrance pair (rows) and the quantities measured (columns), with the energies covered.

Every EXFOR reaction that forms ¹⁷²Tm: entrance pair (rows) and the quantities measured (columns), with the energies covered.
ReactionDatasetsσωγMACSotherFitted in evaluation
171Tm(n,γ)172Tm21325 meV – 190 keV4825 keV – 43 keV6990 meV – 990 keV

Level scheme

Adopted levels of 172Tm from ENSDF, with the particle thresholds and the Gamow window of the selected channel drawn across them.

Level scheme
0.0002-0.063(3)-0.146(4-)0.240(3-)0.250(5-)0.330(4-)0.374(6-)0.407(1)-0.442(5-)0.446(2)-0.475(0)-0.476(6+)0.480(1-,2-)0.4960.519(7-)0.526(0-,1,2-)0.535(1)-0.575(6-)0.6101+0.685(8-)0.715(0-,1)0.720(7-)0.797(0-,1)0.871(9-)Gamow window, T₉ = 0.09S(n) = 6.235 MeVS(p) = 6.945 MeVE (MeV)
  • level in the window with a measured ωγ
  • level in the window with no ωγ in EXFOR
  • Jπ in parentheses or in italics is tentative.

Resonances in the window

Levels between the 171Tm(n,γ)172Tm threshold (S = 6235 keV) and the top of the Gamow window at T9 = 0.09 (50 keV above it), with the resonance strengths ωγ EXFOR holds for them.

Looking for measured strengths…

Resonances in the window
E (keV)E_r (keV, c.m.)JπT½ or Γωγ measured
ENSDF lists no level in this window.

A strength is matched to a level when its resonance energy plus the threshold lies within max(3 keV, 3σ) of the level energy.

Levels of 172Tm (24)
Levels of ¹⁷²Tm
E (keV)JπT½ or Γγ branches
02-T½ = 229000 s–
62.529(3)-–→ 0 (100 %)
145.84(4-)–→ 62.529 (73 %), → 0 (27 %)
239.92(3-)–→ 62.529 (7.8 %), → 0 (92 %)
249.8(5-)–→ 145.84 (53 %), → 62.529 (47 %)
330(4-)–→ 239.92 (56 %), → 62.529 (44 %)
374.4(6-)–→ 249.8 (64 %), → 145.84 (36 %)
407.338(1)-T½ = 1.07 ns→ 239.92 (0.017 %), → 62.529 (1.5 %), → 0 (99 %)
441.7(5-)–→ 330 (43 %), → 239.92 (9.9 %), → 145.84 (47 %)
446.036(2)-–→ 407.34 (0.13 %), → 239.92 (0.055 %), → 145.84 (0.39 %), → 62.529 (44 %), → 0 (55 %)
475.446(0)-–→ 446.04 (0.17 %), → 407.34 (76 %), → 0 (24 %)
476.2(6+)T½ = 132 µs→ 441.7 (12 %), → 374.4 (69 %), → 249.8 (18 %)
479.68(1-,2-)–→ 239.92 (17 %), → 62.529 (36 %), → 0 (47 %)
496.34––→ 0 (100 %)
519.3(7-)–→ 374.4, → 249.8
526.23(0-,1,2-)–→ 446.04 (53 %), → 407.34 (11 %), → 62.529, → 0 (37 %)
535.14(1)-T½ = 1.22 ns→ 475.45 (52 %), → 446.04 (0.089 %), → 407.34 (41 %), → 239.92 (0.047 %), → 62.529 (0.61 %), → 0 (5.7 %)
574.7(6-)–→ 441.7, → 330
610.0621+T½ = 300 ps→ 535.14 (0.26 %), → 496.34 (0.0029 %), → 475.45 (0.023 %), → 446.04 (1.5 %), → 407.34 (2.2 %), → 239.92 (0.0027 %), → 62.529, → 0 (96 %)
685.3(8-)–→ 519.3, → 374.4
714.5(0-,1)–→ 535.14 (7.9 %), → 407.34 (79 %), → 0 (13 %)
719.5(7-)–→ 574.7, → 441.7
797.42(0-,1)–→ 610.06 (7.4 %), → 62.529, → 0 (93 %)
871.3(9-)–→ 685.3, → 519.3