Isotop serium

Isotop utama serium
Iso­top Peluruhan
kelim­pahan waktu paruh (t1/2) mode pro­duk
134Ce sintetis 3,16 hri ε 134La
136Ce 0,186% stabil
138Ce 0,251% stabil
139Ce sintetis 137,640 hri ε 139La
140Ce 88,449% stabil
141Ce sintetis 32,501 hri β 141Pr
142Ce 11,114% stabil
143Ce sintetis 33,039 jam β 143Pr
144Ce sintetis 284,893 hri β 144Pr
Berat atom standar Ar°(Ce)
  • 140,116±0,001
  • 140,12±0,01 (diringkas)[1]

Serium (58Ce) yang terbentuk secara alami terdiri dari empat isotop stabil: 136Ce, 138Ce, 140Ce, dan 142Ce, dengan 140Ce sebagai yang paling melimpah (kelimpahan alami 88,48%) dan satu-satunya yang stabil secara teoritis; 136Ce, 138Ce, dan 142Ce diprediksi mengalami peluruhan beta ganda tetapi proses ini tidak pernah teramati. Ada 35 radioisotop yang telah dikarakterisasi, dengan yang paling stabil adalah 144Ce, dengan waktu paruh 284,893 hari; 139Ce, dengan waktu paruh 137,640 hari; dan 141Ce, dengan waktu paruh 32,501 hari. Semua isotop radioaktif yang tersisa memiliki waktu paruh kurang dari 4 hari dan sebagian besar memiliki waktu paruh kurang dari 10 menit. Unsur ini juga memiliki 10 keadaan meta.

Isotop serium memiliki berat atom berkisar dari 119 u (119Ce) hingga 157 u (157Ce).

Daftar isotop

Nuklida
[n 1]
Z N Massa isotop (Da)
[n 2][n 3]
Waktu paruh
[n 4]
Mode
peluruhan

[n 5]
Isotop
anak

[n 6]
Spin dan
paritas
[n 7][n 4]
Kelimpahan alami (fraksi mol)
Energi eksitasi Proporsi normal Rentang variasi
119Ce 58 61 118,95276(64)# 200# mdtk β+ 119La 5/2+#
120Ce 58 62 119,94664(75)# 250# mdtk β+ 120La 0+
121Ce 58 63 120,94342(54)# 1,1(1) dtk β+ 121La (5/2)(+#)
122Ce 58 64 121,93791(43)# 2# dtk β+ 122La 0+
β+, p 121Ba
123Ce 58 65 122,93540(32)# 3,8(2) dtk β+ 123La (5/2)(+#)
β+, p 122Ba
124Ce 58 66 123,93041(32)# 9,1(12) dtk β+ 124La 0+
125Ce 58 67 124,92844(21)# 9,3(3) dtk β+ 125La (7/2−)
β+, p 124Ba
126Ce 58 68 125,92397(3) 51,0(3) dtk β+ 126La 0+
127Ce 58 69 126,92273(6) 29(2) dtk β+ 127La 5/2+#
128Ce 58 70 127,91891(3) 3,93(2) mnt β+ 128La 0+
129Ce 58 71 128,91810(3) 3,5(3) mnt β+ 129La (5/2+)
130Ce 58 72 129,91474(3) 22,9(5) mnt β+ 130La 0+
130mCe 2453,6(3) keV 100(8) ndtk (7−)
131Ce 58 73 130,91442(4) 10,2(3) mnt β+ 131La (7/2+)
131mCe 61,8(1) keV 5,0(10) mnt β+ 131La (1/2+)
132Ce 58 74 131,911460(22) 3,51(11) jam β+ 132La 0+
132mCe 2340,8(5) keV 9,4(3) ms IT 132Ce (8−)
133Ce 58 75 132,911515(18) 97(4) mnt β+ 133La 1/2+
133mCe 37,1(8) keV 4,9(4) hri β+ 133La 9/2−
134Ce 58 76 133,908925(22) 3,16(4) hri EC 134La 0+
135Ce 58 77 134,909151(12) 17,7(3) jam β+ 135La 1/2(+)
135mCe 445,8(2) keV 20(1) dtk IT 135Ce (11/2−)
136Ce 58 78 135,907172(14) Stabil Secara Pengamatan[n 8] 0+ 0,00185(2) 0,00185–0,00186
136mCe 3095,5(4) keV 2,2(2) µdtk 10+
137Ce 58 79 136,907806(14) 9,0(3) jam β+ 137La 3/2+
137mCe 254,29(5) keV 34,4(3) jam IT (99,22%) 137Ce 11/2−
β+ (0,779%) 137La
138Ce 58 80 137,905991(11) Stabil Secara Pengamatan[n 9] 0+ 0,00251(2) 0,00251–0,00254
138mCe 2129,17(12) keV 8,65(20) mdtk IT 138Ce 7-
139Ce 58 81 138,906653(8) 137,641(20) hri EC 139La 3/2+
139mCe 754,24(8) keV 56,54(13) dtk IT 139Ce 11/2−
140Ce[n 10] 58 82 139,9054387(26) Stabil[n 11] 0+ 0,88450(51) 0,88446–0,88449
140mCe 2107,85(3) keV 7,3(15) µdtk 6+
141Ce[n 10] 58 83 140,9082763(26) 32,508(13) hri β 141Pr 7/2−
142Ce[n 10] 58 84 141,909244(3) Stabil Secara Pengamatan[n 12][2][3] 0+ 0,11114(51) 0,11114–0,11114
143Ce[n 10] 58 85 142,912386(3) 33,039(6) jam β 143Pr 3/2−
144Ce[n 10] 58 86 143,913647(4) 284,91(5) hri β 144mPr 0+
145Ce 58 87 144,91723(4) 3,01(6) mnt β 145Pr (3/2−)
146Ce 58 88 145,91876(7) 13,52(13) mnt β 146Pr 0+
147Ce 58 89 146,92267(3) 56,4(10) dtk β 147Pr (5/2−)
148Ce 58 90 147,92443(3) 56(1) dtk β 148Pr 0+
149Ce 58 91 148,9284(1) 5,3(2) dtk β 149Pr (3/2−)#
150Ce 58 92 149,93041(5) 4,0(6) dtk β 150Pr 0+
151Ce 58 93 150,93398(11) 1,02(6) dtk β 151Pr 3/2−#
152Ce 58 94 151,93654(21)# 1,4(2) dtk β 152Pr 0+
153Ce 58 95 152,94058(43)# 500# mdtk [>300 ndtk] β 153Pr 3/2−#
154Ce 58 96 153.94342(54)# 300# mdtk [>300 ndtk] β 154Pr 0+
155Ce 58 97 154,94804(64)# 200# mdtk [>300 ndtk] β 155Pr 5/2−#
156Ce 58 98 155,95126(64)# 150# mdtk β 156Pr 0+
157Ce 58 99 156,95634(75)# 50# mdtk β 157Pr 7/2+#
Header & footer tabel ini:  view 
  1. ^ mCe – Isomer nuklir tereksitasi.
  2. ^ ( ) – Ketidakpastian (1σ) diberikan dalam bentuk ringkas dalam tanda kurung setelah digit terakhir yang sesuai.
  3. ^ # – Massa atom bertanda #: nilai dan ketidakpastian yang diperoleh bukan dari data eksperimen murni, tetapi setidaknya sebagian dari tren dari Permukaan Massa (trends from the Mass Surface, TMS).
  4. ^ a b # – Nilai yang ditandai # tidak murni berasal dari data eksperimen, tetapi setidaknya sebagian dari tren nuklida tetangga (trends of neighboring nuclides, TNN).
  5. ^ Mode peluruhan:
    EC: Penangkapan elektron
    IT: Transisi isomerik


    p: Emisi proton
  6. ^ Simbol tebal sebagai anak – Produk anak stabil.
  7. ^ ( ) nilai spin – Menunjukkan spin dengan argumen penempatan yang lemah.
  8. ^ Diteorikan mengalami peluruhan β+β+ menjadi 136Ba dengan waktu paruh lebih dari 38×1015 tahun
  9. ^ Diteorikan mengalami peluruhan β+β+ menjadi 138Ba dengan waktu paruh lebih dari 150×1012 tahun
  10. ^ a b c d e Produk fisi
  11. ^ Secara teoritis mampu mengalami fisi spontan
  12. ^ Diteorikan mengalami peluruhan ββ menjadi 142Nd atau α menjadi 138Ba dengan waktu paruh lebih dari 2,9×1018 tahun

Referensi

  1. ^ Meija, J.; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure Appl. Chem. 88 (3): 265–91. doi:10.1515/pac-2015-0305. 
  2. ^ Kondev, F.G.; Wang, M.; Huang, W.J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 98. doi:10.1088/1674-1137/abddae. 
  3. ^ Belli, P.; Bernabei, R.; Danevich, F. A.; Incicchitti, A.; Tretyak, V. I. (2019). "Experimental searches for rare alpha and beta decays". European Physical Journal A. 55 (140): 4–6. doi:10.1140/epja/i2019-12823-2. 

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