Isotopes of samarium

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Template:Short description Template:Infobox samarium isotopes Naturally occurring samarium (62Sm) is composed of five stable isotopes, 144Sm, 149Sm, 150Sm, 152Sm and 154Sm, and two extremely long-lived radioisotopes, 147Sm (half life: 1.066Template:E y) and 148Sm (6.3Template:E y), with 152Sm being the most abundant (26.75% natural abundance). 146Sm (9.20Template:E y)[1] is also fairly long-lived, but is not long-lived enough to have survived in significant quantities from the formation of the Solar System on Earth, although it remains useful in radiometric dating in the Solar System as an extinct radionuclide.[2] It is the longest-lived nuclide that has not yet been confirmed to be primordial. Its instability is due to having 84 neutrons (two more than 82, which is a magic number corresponding to a stable neutron configuration), and so it may emit an alpha particle (which has 2 neutrons) to form neodymium-142 with 82 neutrons.

Other than those, the longest-lived radioisotopes are 151Sm, which has a half-life of 94.6 years,[3] and 145Sm, which has a half-life of 340 days. All of the remaining radioisotopes, which range from 129Sm to 168Sm, have half-lives that are less than two days, and the majority of these have half-lives that are less than 48 seconds. The most stable of the known isomers is 141mSm (half-life 22.6 minutes).

The long-lived isotopes, 146Sm, 147Sm, and 148Sm, decay by alpha emission to isotopes of neodymium. Lighter unstable isotopes of samarium primarily decay by electron capture to isotopes of promethium, while heavier ones decay by beta decay to isotopes of europium. A 2012 paper[4] revising the estimated half-life of 146Sm from 10.3(5)×107 y to 6.8(7)×107 y was retracted (due to an experimental mistake) in 2023,[4][5] and the current, more accurate, value published subsequently.

The isotope 147Sm is used in samarium–neodymium dating and as mentioned the extinct 146Sm can also be used for dating.

151Sm is a medium-lived fission product and acts as a neutron poison in the nuclear fuel cycle. The stable fission product 149Sm is also a neutron poison.

Samarium is the lightest element with even atomic number with no theoretically stable isotopes (all isotopes of it can energetically decay by the alpha, beta, or double-beta modes); other such elements are those with atomic numbers > 66 (dysprosium, which has the heaviest theoretically stable nuclide, 164Dy).

List of isotopes


Template:Isotopes table |-id=Samarium-128 | 128Sm[6] | style="text-align:right" | 62 | style="text-align:right" | 66 | 127.95797(54)# | style="text-align:center" | 2025 | 500# ms
[>310 ns] | | | 0+ | | |-id=Samarium-129 | rowspan=2|129Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 67 | rowspan=2|128.95456(54)# | rowspan=2 style="text-align:center" | 1999 | rowspan=2|550(100) ms | β+ (?%) | 129Pm | rowspan=2|(1/2+,3/2+) | rowspan=2| | rowspan=2| |- | β+, p (?%) | 128Nd |-id=Samarium-130 | 130Sm | style="text-align:right" | 62 | style="text-align:right" | 68 | 129.94879(43)# | style="text-align:center" | 1999 | 1# s | | | 0+ | | |-id=Samarium-131 | rowspan=2|131Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 69 | rowspan=2|130.94602(43)# | rowspan=2 style="text-align:center" | 1986 | rowspan=2|1.2(2) s | β+ | 131Pm | rowspan=2|5/2+# | rowspan=2| | rowspan=2| |- | β+, p (?%) | 130Nd |-id=Samarium-132 | 132Sm | style="text-align:right" | 62 | style="text-align:right" | 70 | 131.94081(32)# | style="text-align:center" | 1989 | 4.0(3) s | β+ | 132Pm | 0+ | | |-id=Samarium-133 | rowspan=2|133Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 71 | rowspan=2|132.93856(32)# | rowspan=2 style="text-align:center" | 1977 | rowspan=2|2.89(16) s | β+ (?%) | 133Pm | rowspan=2|(5/2+) | rowspan=2| | rowspan=2| |- | β+, p (?%) | 132Nd |-id=Samarium-133m | style="text-indent:1em" | 133mSm | colspan="3" style="text-indent:2em" | 120(60)# keV | style="text-align:center" | 2001 | 3.5(4) s | β+ | 133Pm | (1/2−) | | |-id=Samarium-134 | 134Sm | style="text-align:right" | 62 | style="text-align:right" | 72 | 133.93411(21)# | style="text-align:center" | 1977 | 9.5(8) s | β+ | 134Pm | 0+ | | |-id=Samarium-135 | rowspan=2|135Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 73 | rowspan=2|134.93252(17) | rowspan=2 style="text-align:center" | 1977 | rowspan=2|10.3(5) s | β+ (99.98%) | 135Pm | rowspan=2|(7/2+) | rowspan=2| | rowspan=2| |- | β+, p (0.02%) | 134Nd |-id=Samarium-136 | 136Sm | style="text-align:right" | 62 | style="text-align:right" | 74 | 135.928276(13) | style="text-align:center" | 1982 | 47(2) s | β+ | 136Pm | 0+ | | |-id=Samarium-136m | style="text-indent:1em" | 136mSm | colspan="3" style="text-indent:2em" | 2264.7(11) keV | style="text-align:center" | 1994 | 15(1) μs | IT | 136Sm | (8−) | | |-id=Samarium-137 | 137Sm | style="text-align:right" | 62 | style="text-align:right" | 75 | 136.927008(31) | style="text-align:center" | 1986 | 45(1) s | β+ | 137Pm | (9/2−) | | |-id=Samarium-138 | 138Sm | style="text-align:right" | 62 | style="text-align:right" | 76 | 137.923244(13) | style="text-align:center" | 1982 | 3.1(2) min | β+ | 138Pm | 0+ | | |-id=Samarium-139 | 139Sm | style="text-align:right" | 62 | style="text-align:right" | 77 | 138.922297(12) | style="text-align:center" | 1971 | 2.57(10) min | β+ | 139Pm | 1/2+ | | |-id=Samarium-139m | rowspan=2 style="text-indent:1em" | 139mSm | rowspan=2 colspan="3" style="text-indent:2em" | 457.38(23) keV | rowspan=2 style="text-align:center" | 1975 | rowspan=2|10.7(6) s | IT (93.7%) | 139Sm | rowspan=2|11/2− | rowspan=2| | rowspan=2| |- | β+ (6.3%) | 139Pm |-id=Samarium-140 | 140Sm | style="text-align:right" | 62 | style="text-align:right" | 78 | 139.918995(13) | style="text-align:center" | 1967 | 14.82(12) min | β+ | 140Pm | 0+ | | |-id=Samarium-141 | 141Sm | style="text-align:right" | 62 | style="text-align:right" | 79 | 140.9184815(92) | style="text-align:center" | 1967 | 10.2(2) min | β+ | 141Pm | 1/2+ | | |-id=Samarium-141m | rowspan=2 style="text-indent:1em" | 141mSm | rowspan=2 colspan="3" style="text-indent:2em" | 175.9(3) keV | rowspan=2 style="text-align:center" | 1970 | rowspan=2|22.6(2) min | β+ (99.69%) | 141Pm | rowspan=2|11/2− | rowspan=2| | rowspan=2| |- | IT (0.31%) | 141Sm |-id=Samarium-142 | rowspan=2|142Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 80 | rowspan=2|141.9152094(20) | rowspan=2 style="text-align:center" | 1959 | rowspan=2|72.49(5) min | EC (>95%) | rowspan=2|142Pm | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β+ (<5%) |-id=Samarium-142m1 | style="text-indent:1em" | 142m1Sm | colspan="3" style="text-indent:2em" | 2372.1(4) keV | style="text-align:center" | 1975 | 170(2) ns | IT | 142Sm | 7− | | |-id=Samarium-142m2 | style="text-indent:1em" | 142m2Sm | colspan="3" style="text-indent:2em" | 3662.2(7) keV | style="text-align:center" | 1981 | 480(60) ns | IT | 142Sm | 10+ | | |-id=Samarium-143 | rowspan=2|143Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 81 | rowspan=2|142.9146348(30) | rowspan=2 style="text-align:center" | 1956 | rowspan=2|8.75(6) min | EC (60.0%) | 143Pm | rowspan=2|3/2+ | rowspan=2| | rowspan=2| |- | β+ (40.0%) | 143Pm |-id=Samarium-143m1 | rowspan=2 style="text-indent:1em" | 143m1Sm | rowspan=2 colspan="3" style="text-indent:2em" | 753.99(16) keV | rowspan=2 style="text-align:center" | 1960 | rowspan=2|66(2) s | IT (99.76%) | 143Sm | rowspan=2|11/2− | rowspan=2| | rowspan=2| |- | β+ (0.24%) | 143Pm |-id=Samarium-143m2 | style="text-indent:1em" | 143m2Sm | colspan="3" style="text-indent:2em" | 2793.8(13) keV | style="text-align:center" | 1969 | 30(3) ms | IT | 143Sm | 23/2− | | |-id=Samarium-144 | 144Sm | style="text-align:right" | 62 | style="text-align:right" | 82 | 143.9120063(16) | style="text-align:center" | 1934 | colspan=3 align=center|Observationally stable[n 1]Template:R/superscript | 0+ | 0.0308(4) | |-id=Samarium-144m | style="text-indent:1em" | 144mSm | colspan="3" style="text-indent:2em" | 2323.60(8) keV | style="text-align:center" | 1972 | 880(25) ns | IT | 144Sm | 6+ | | |-id=Samarium-145 | 145Sm | style="text-align:right" | 62 | style="text-align:right" | 83 | 144.9134172(16) | style="text-align:center" | 1947 | 340(3) d | EC | 145Pm | 7/2− | | |-id=Samarium-145m | style="text-indent:1em" | 145mSm | colspan="3" style="text-indent:2em" | 8815(1) keV | style="text-align:center" | 1993 | 3.52(16) μs | IT | 145Sm | 49/2+ | | |-id=Samarium-146 | 146Sm | style="text-align:right" | 62 | style="text-align:right" | 84 | 145.9130468(33) | style="text-align:center" | 1953 | 9.20(26)Template:E y[1] | α | 142Nd | 0+ | Trace | |-id=Samarium-147 | 147Sm[n 2][n 3][n 4] | style="text-align:right" | 62 | style="text-align:right" | 85 | 146.9149044(14) | style="text-align:center" | 1933 | 1.066(5)Template:E y | α | 143Nd | 7/2− | 0.1500(14) | |-id=Samarium-148 | 148Sm[n 2] | style="text-align:right" | 62 | style="text-align:right" | 86 | 147.9148292(13) | style="text-align:center" | 1933 | 6.3(13)Template:E y | α | 144Nd | 0+ | 0.1125(9) | |-id=Samarium-149 | 149Sm[n 3][n 5] | style="text-align:right" | 62 | style="text-align:right" | 87 | 148.9171912(12) | style="text-align:center" | 1933 | colspan=3 align=center|Observationally stable[n 6]Template:R/superscript | 7/2− | 0.1382(10) | |-id=Samarium-150 | 150Sm | style="text-align:right" | 62 | style="text-align:right" | 88 | 149.9172820(12) | style="text-align:center" | 1934 | colspan=3 align=center|Observationally stable[n 7]Template:R/superscript | 0+ | 0.0737(9) | |-id=Samarium-151 | 151Sm[n 3][n 5] | style="text-align:right" | 62 | style="text-align:right" | 89 | 150.9199389(12) | style="text-align:center" | 1947 | 94.6(6) y | β− | 151Eu | 5/2− | | |-id=Samarium-151m | style="text-indent:1em" | 151mSm | colspan="3" style="text-indent:2em" | 261.13(4) keV | style="text-align:center" | 1970 | 1.4(1) μs | IT | 151Sm | (11/2)− | | |-id=Samarium-152 | 152Sm[n 3] | style="text-align:right" | 62 | style="text-align:right" | 90 | 151.9197386(11) | style="text-align:center" | 1933 | colspan=3 align=center|Observationally stable[n 8]Template:R/superscript | 0+ | 0.2674(9) | |-id=Samarium-153 | 153Sm[n 3] | style="text-align:right" | 62 | style="text-align:right" | 91 | 152.9221036(11) | style="text-align:center" | 1938 | 46.2846(23) h | β− | 153Eu | 3/2+ | | |-id=Samarium-153m | style="text-indent:1em" | 153mSm | colspan="3" style="text-indent:2em" | 98.39(10) keV | style="text-align:center" | (1971)[n 9] | 10.6(3) ms | IT | 153Sm | 11/2− | | |-id=Samarium-154 | 154Sm[n 3] | style="text-align:right" | 62 | style="text-align:right" | 92 | 153.9222158(14) | style="text-align:center" | 1933 | colspan=3 align=center|Observationally stable[n 10]Template:R/superscript | 0+ | 0.2274(14) | |-id=Samarium-155 | 155Sm | style="text-align:right" | 62 | style="text-align:right" | 93 | 154.9246466(14) | style="text-align:center" | 1951 | 22.18(6) min | β− | 155Eu | 3/2− | | |-id=Samarium-155m1 | style="text-indent:1em" | 155m1Sm | colspan="3" style="text-indent:2em" | 16.5467(19) keV | style="text-align:center" | 2010 | 2.8(5) μs | IT | 155Sm | 5/2+ | | |-id=Samarium-155m2 | style="text-indent:1em" | 155m2Sm | colspan="3" style="text-indent:2em" | 538.03(19) keV | style="text-align:center" | 2010 | 1.00(8) μs | IT | 155Sm | 11/2− | | |-id=Samarium-156 | 156Sm | style="text-align:right" | 62 | style="text-align:right" | 94 | 155.9255382(91) | style="text-align:center" | 1951 | 9.4(2) h | β− | 156Eu | 0+ | | |-id=Samarium-156m | style="text-indent:1em" | 156mSm | colspan="3" style="text-indent:2em" | 1397.55(9) keV | style="text-align:center" | 1990 | 185(7) ns | IT | 156Sm | 5− | | |-id=Samarium-157 | 157Sm | style="text-align:right" | 62 | style="text-align:right" | 95 | 156.9284186(48) | style="text-align:center" | 1973 | 8.03(7) min | β− | 157Eu | 3/2−# | | |-id=Samarium-158 | 158Sm | style="text-align:right" | 62 | style="text-align:right" | 96 | 157.9299493(51) | style="text-align:center" | 1970 | 5.30(3) min | β− | 158Eu | 0+ | | |-id=Samarium-159 | 159Sm | style="text-align:right" | 62 | style="text-align:right" | 97 | 158.9332171(64) | style="text-align:center" | 1986 | 11.37(15) s | β− | 159Eu | 5/2− | | |-id=Samarium-159m | style="text-indent:1em" | 159mSm | colspan="3" style="text-indent:2em" | 1276.5(8) keV | style="text-align:center" | 2009 | 116(8) ns | IT | 159Sm | (15/2+) | | |-id=Samarium-160 | 160Sm | style="text-align:right" | 62 | style="text-align:right" | 98 | 159.9353370(21) | style="text-align:center" | 1986 | 9.6(3) s | β− | 160Eu | 0+ | | |-id=Samarium-160m1 | style="text-indent:1em" | 160m1Sm | colspan="3" style="text-indent:2em" | 1361.3(4) keV | style="text-align:center" | 2009 | 120(46) ns | IT | 160Sm | (5−) | | |-id=Samarium-160m2 | style="text-indent:1em" | 160m2Sm | colspan="3" style="text-indent:2em" | 2757.3(4) keV | style="text-align:center" | 2016 | 1.8(4) μs | IT | 160Sm | (11+) | | |-id=Samarium-161 | 161Sm | style="text-align:right" | 62 | style="text-align:right" | 99 | 160.9391601(73) | style="text-align:center" | 1998 | 4.8(4) s | β− | 161Eu | 7/2+# | | |-id=Samarium-161m | style="text-indent:1em" | 161mSm | colspan="3" style="text-indent:2em" | 1388.1(6) keV | style="text-align:center" | 2017 | 2.6(4) μs | IT | 161Sm | (17/2−) | | |-id=Samarium-162 | 162Sm | style="text-align:right" | 62 | style="text-align:right" | 100 | 161.9416217(38) | style="text-align:center" | 2005 | 2.7(3) s | β− | 162Eu | 0+ | | |-id=Samarium-162m | style="text-indent:1em" | 162mSm | colspan="3" style="text-indent:2em" | 1009.4(5) keV | style="text-align:center" | 2017 | 1.78(7) μs | IT | 162Sm | (4−) | | |-id=Samarium-163 | rowspan=2|163Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 101 | rowspan=2|162.9456791(79) | rowspan=2 style="text-align:center" | 2012 | rowspan=2|1.744+0.180
−0.204 s[8] | β− | 163Eu | rowspan=2|1/2−# | rowspan=2| | rowspan=2| |- | β−, n (<0.1%) | 162Eu |-id=Samarium-164 | rowspan=2|164Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 102 | rowspan=2|163.9485501(44) | rowspan=2 style="text-align:center" | 2012 | rowspan=2|1.422+0.54
−0.59 s[8] | β− | 164Eu | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β−, n (<0.7%) | 163Eu |-id=Samarium-164m | style="text-indent:1em" | 164mSm | colspan="3" style="text-indent:2em" | 1485.5(12) keV | style="text-align:center" | 2014 | 600(140) ns | IT | 164Sm | (6−) | | |-id=Samarium-165 | rowspan=2|165Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 103 | rowspan=2|164.95329(43)# | rowspan=2 style="text-align:center" | 2012 | rowspan=2|592+51
−55 ms[8] | β− (98.64%) | 165Eu | rowspan=2|5/2−# | rowspan=2| | rowspan=2| |- | β−, n (1.36%) | 164Eu |-id=Samarium-166 | rowspan=2|166Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 104 | rowspan=2|165.95658(43)# | rowspan=2 style="text-align:center" | 2017 | rowspan=2|396+56
−63 ms[8] | β− (95.62%) | 166Eu | rowspan=2|0+ | rowspan=2| | rowspan=2| |- | β−, n (4.38%) | 165Eu |-id=Samarium-167 | rowspan=2|167Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 105 | rowspan=2|166.96207(54)# | rowspan=2 style="text-align:center" | 2018 | rowspan=2|334+83
−78 ms[8] | β− | 167Eu | rowspan=2|7/2−# | rowspan=2| | rowspan=2| |- | β−, n (<16%) | 166Eu |-id=Samarium-168 | rowspan=2|168Sm | rowspan=2 style="text-align:right" | 62 | rowspan=2 style="text-align:right" | 106 | rowspan=2|167.96603(32)# | rowspan=2 style="text-align:center" | 2022 | rowspan=2|353+210
−164 ms[8] | β− | 168Eu | rowspan=2|0+# | rowspan=2| | rowspan=2| |- | β−, n (<21%) | 167Eu Template:Isotopes table/footer

Samarium-149

Samarium-149 (149Sm) is an observationally stable isotope of samarium (predicted to decay, but no decays have ever been observed, giving it a half-life at least several orders of magnitude longer than the age of the universe), and a product of the decay chain from the fission product 149Nd (yield 1.0888%). 149Sm is a neutron-absorbing nuclear poison with significant effect on nuclear reactor operation, second only to 135Xe. Its neutron cross section is 40140 barns for thermal neutrons.

The equilibrium concentration (and thus the poisoning effect) builds to an equilibrium value in about 500 hours (about 20 days) of reactor operation, and since 149Sm is stable, the concentration remains essentially constant during further reactor operation. This contrasts with xenon-135, which accumulates from the beta decay of iodine-135 (a short lived fission product) and has a high neutron cross section, but itself decays with a half-life of 9.2 hours (so does not remain in constant concentration long after the reactor shutdown), causing the so-called xenon pit.

Samarium-151

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Nuclide tPage Template:Fraction/styles.css has no content.1⁄2 Yield Q[a 1] βγ
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155Eu Template:Fsp4.74 Template:Fsp0.0803[a 3] 252 βγ
85Kr 10.73 Template:Fsp0.2180[a 4] 687 βγ
113mCd 13.9Template:Fsp Template:Fsp0.0008[a 3] 316 β
90Sr 28.91 4.505Template:Fsp 2826[a 5] β
137Cs 30.04 6.337Template:Fsp 1176 βγ
121mSn 43.9Template:Fsp 0.00005Template:Fsp 390 βγ
151Sm 94.6Template:Fsp 0.5314[a 3] 77 β
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  1. ^ Decay energy is split among β, neutrino, and γ if any.
  2. ^ Per 65 thermal neutron fissions of 235U and 35 of 239Pu.
  3. ^ a b c Neutron poison; in thermal reactors, most is destroyed by further neutron capture.
  4. ^ Less than 1/4 of mass-85 fission products as most bypass ground state: 85Br → 85mKr → 85Rb.
  5. ^ Has decay energy 546 keV; its decay product 90Y has decay energy 2.28 MeV with weak gamma branching.
Yield, % per fission[9]
Thermal Fast 14 MeV
232Th not fissile 0.399 ± 0.065 0.165 ± 0.035
233U 0.333 ± 0.017 0.312 ± 0.014 0.49 ± 0.11
235U 0.4204 ± 0.0071 0.431 ± 0.015 0.388 ± 0.061
238U not fissile 0.810 ± 0.012 0.800 ± 0.057
239Pu 0.776 ± 0.018 0.797 ± 0.037 ?
241Pu 0.86 ± 0.24 0.910 ± 0.025 ?

Samarium-151 (151Sm) has a half-life of 94.6 years, undergoing low-energy beta decay, and has a fission product yield of 0.4203% for thermal neutrons and 235U, about 39% of 149Sm's yield. The yield is somewhat higher for 239Pu.

Its neutron absorption cross section for thermal neutrons is high at 15200 barns, about 38% of 149Sm's absorption cross section, or about 20 times that of 235U. Since the ratios between the production and absorption rates of 151Sm and 149Sm are almost equal, the two isotopes should reach similar equilibrium concentrations. Since 149Sm reaches equilibrium in about 500 hours (20 days), 151Sm should reach equilibrium in about 50 days. As this is still much shorter than its radioactive half-life, decay will hardly affect this equilibrium while in the reactor.

Since nuclear fuel is used for several years (burnup) in a nuclear power plant, the final amount of 151Sm in the spent nuclear fuel at discharge is only a small fraction of the total 151Sm produced during the use of the fuel. According to one study, the mass fraction of 151Sm in spent fuel is about 0.0025 for heavy loading of MOX fuel and about half that for uranium fuel, which is roughly two orders of magnitude less than the mass fraction of about 0.15 for the medium-lived fission product 137Cs.[10] The decay energy of 151Sm is also about an order of magnitude less than that of 137Cs. The low yield, low survival rate, and low decay energy mean that 151Sm has insignificant nuclear waste impact compared to the two main medium-lived fission products 137Cs and 90Sr.

Samarium-153

Samarium-153 (153Sm) has a half-life of 46.285 hours, undergoing β− decay into stable 153Eu. As a component of samarium lexidronam, it is used in palliation of bone cancer.[11] It is treated by the body in a similar manner to calcium, and it localizes selectively to bone.

See also

Daughter products other than samarium

References

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  1. ^ a b Cite error: The named reference Chiera2024 was invoked but never defined (see the help page).
  2. ^ Page Module:Citation/CS1/styles.css has no content.Samir Maji; et al. (2006). "Separation of samarium and neodymium: a prerequisite for getting signals from nuclear synthesis". Analyst. 131 (12): 1332–1334. Bibcode:2006Ana...131.1332M. doi:10.1039/b608157f. PMID 17124541.
  3. ^ Page Module:Citation/CS1/styles.css has no content.He, M.; Shen, H.; Shi, G.; Yin, X.; Tian, W.; Jiang, S. (2009). "Half-life of 151Sm remeasured". Physical Review C. 80 (6) 064305. Bibcode:2009PhRvC..80f4305H. doi:10.1103/PhysRevC.80.064305.
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