SPONTANEOUS FISSION OF LIGHT CALIFORNIUM ISOTOPES PRODUCED IN PB-206, PB-207, PB-208+S-34, S-36 REACTIONS - NEW NUCLIDE CF-238

Lazarev YA.; Utyonkov VK.; Tretyakova SP.; Kutner VB.; Shirokovsky IV.

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SPONTANEOUS FISSION OF LIGHT CALIFORNIUM ISOTOPES PRODUCED IN PB-206, PB-207, PB-208+S-34, S-36 REACTIONS - NEW NUCLIDE CF-238

机译：PB-206，PB-207，PB-208 + S-34，S-36反应中产生的轻加利福尼亚同位素的自发裂变-新核素CF-238

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In bombardments of Pb-206,207,208 with S-34 and Pb-206 with S-36, we identified a new spontaneously fissioning isotope Cf-238 with T(sf) almost-equal T1/2 = 21 +/- 2 ms and obtained evidence of the production of a new isotope Cf-237 with T1/2 = 2.1 +/- 0.3 s. The spontaneous-fission (SF) decay mode was established for Cf-240; its SF branch was estimated to be b(sf) approximately 2 x 10(-2). We measured also b(sf) less-than-or-equal-to 1.4 x 10(-4) for Cf-242 and estimated b(sf) approximately 10(-1) for Cf-237. The production cross sections of Cf-238 in the Pb-206,207,208 + S-34 reactions were measured to be in the range of 0.3 to 1.1 nb. Finally, we probed the influence of the neutron excess in the N = 20 projectile S-36 on cross sections of fusion-evaporation reactions occurring on lead targets. [References: 24]

机译：在用S-34轰击Pb-206,207,208和用S-36轰击Pb-206时，我们发现了一个新的自发裂变同位素Cf-238，其T（sf）几乎等于T1 / 2 = 21 +/- 2 ms，并获得了证据T1 / 2 = 2.1 +/- 0.3 s的新同位素Cf-237的生产过程。建立了Cf-240的自发裂变（SF）衰减模式。它的SF分支估计为b（sf）大约2 x 10（-2）。我们还测量了Cf-242的b（sf）小于或等于1.4 x 10（-4），而Cf-237的b（sf）估计约为10（-1）。经测量，Pb-206,207,208 + S-34反应中Cf-238的生产截面在0.3至1.1 nb的范围内。最后，我们探查了N = 20弹丸S-36中的中子过量对铅靶上发生的聚变蒸发反应截面的影响。 [参考：24]

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来源
《Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions》 |1995年第2期|共9页
作者
Lazarev YA.; Utyonkov VK.; Tretyakova SP.; Kutner VB.; Shirokovsky IV.;
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正文语种 eng
中图分类原子核物理学、高能物理学;
关键词
Cf-237; cf-238; cf-240 (sf); Measured t1/2; deduced spontaneous fission branches; Cf-242 (sf); Measured upper limit for spontaneous-fission branch; Fm-246; Measured t1/2; Nuclear reactions pb-206; pb-207; pb-208(s-34; x); pb-206(s-36; x); e=215 mev; Pb-208(ar-40; x); e=225 mev; Measured production-sigma for spontaneously fissioning cf-237; cf-238; cf-240 n; Uclei; Isotopically enriched targets; Evaporation residues; Barrier; Fusion;

机译：Cf-237;cf-238;cf-240（sf）;测得的t1 / 2;推导的自发裂变分支;Cf-242（sf）;测得的自发裂变上限;Fm-246;测得的t1 / 2;核反应pb-206;pb-207;pb-208（s-34;x）;pb-206（s-36;x）;e = 215 mev;Pb-208（ar-40;x）;e = 225 mev;自发裂变的测量产量sigma cf-237;cf-238;cf-240 n;核;同位素富集的靶标;蒸发残留物;屏障;融合;

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1. SPONTANEOUS FISSION OF LIGHT CALIFORNIUM ISOTOPES PRODUCED IN PB-206, PB-207, PB-208+S-34, S-36 REACTIONS - NEW NUCLIDE CF-238 [J] . Lazarev YA., Utyonkov VK., Tretyakova SP., Nuclear Physics, A: Journal Devoted to the Experimental Study of the Fundamental Constituents of Matter and Their Actions . 1995,第2期

机译：PB-206，PB-207，PB-208 + S-34，S-36反应中产生的轻加利福尼亚同位素的自发裂变-新核素CF-238
2. Measurements of neutron-induced fission cross-sections of Tl-205, Pb-204,Pb-206,Pb-207,Pb-208 and Bi-209 with a multi-section Frisch-gridded ionization chamber [J] . Ryzhov IV, Tutin GA, Mitryukhin AG, Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment . 2006,第1期

机译：用多段式Frisch网格电离室测量Tl-205，Pb-204，Pb-206，Pb-207，Pb-208和Bi-209的中子裂变截面
3. (A = 10)-Accompanied spontaneous ternary fission of californium isotopes [J] . Ismail M., Seif W.M., Ellithi A.Y., Canadian Journal of Physics . 2013,第5期

机译：（A = 10）-同位素的自发三元裂变
4. Experimental Cross Sections And Velocities Of Light Nuclides Produced In The Proton-Induced Fission Of 238U At 1 GeV [C] . M. V. Ricciardi, K. -H. Schmidt, F. Rejmund, International Workshop on Nuclear Fission and Fission-Product Spectroscopy . 2005

机译：在1 GEV的质子诱导的238U裂变中产生的光核苷酸的实验横截面和速度
5. High spin studies of neutron-rich nuclei produced in the spontaneous fission process of californium-252. [D] . Zhang, Xueqian. 2001

机译：spin 252自发裂变过程中产生的富中子核的高自旋研究。
6. Fractionation of the Three Stable Oxygen Isotopes by Oxygen-Producing and Oxygen-Consuming Reactions in Photosynthetic Organisms [O] . Yael Helman, Eugeni Barkan, Doron Eisenstadt, 2005

机译：光合生物中产氧和耗氧反应对三种稳定氧同位素的分馏
7. The changing nature of the Pb-206/Pb-207 isotopic ratio of lead in rainwater, atmospheric particulates, pine needles and leaded petrol in Scotland, 1982-1998 [O] . Farmer, John G., Eades, Lorna J., Graham, Margaret C., 2000

机译：1982 - 1998年苏格兰雨水，大气颗粒物，松针和含铅汽油中铅pb-206 / pb-207同位素比的变化性质
8. Spontaneous Fission of Light Californium Isotopes Produced in the (sup 206),(sup 207),(sup 208) Pb + (sup 34),(sup 36) S Reactions; New Nuclide (sup 238) Cf [R] . Lazarev, Y. , Shirokovskij, I. V. , Utenkov, V. K. , 1994

机译：轻锑同位素的自发裂变产生于（sup 206），（sup 207），（sup 208）pb +（sup 34），（sup 36）s反应; New Nuclide（sup 238）Cf

SPONTANEOUS FISSION OF LIGHT CALIFORNIUM ISOTOPES PRODUCED IN PB-206, PB-207, PB-208+S-34, S-36 REACTIONS - NEW NUCLIDE CF-238

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