β-decay half-lives and β-delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126

被引：27

作者：

Caballero-Folch, R. ^{[1
,2
]}

Domingo-Pardo, C. ^{[3
]}

Agramunt, J. ^{[3
]}

Algora, A. ^{[3
,4
]}

Ameil, F. ^{[5
]}

Ayyad, Y. ^{[6
]}

Benlliure, J. ^{[6
]}

Bowry, M. ^{[7
]}

Calvino, F. ^{[1
]}

Cano-Ott, D. ^{[8
]}

Cortes, G. ^{[1
]}

Davinson, T. ^{[9
]}

Dillmann, I. ^{[2
,5
,10
]}

Estrade, A. ^{[5
,11
]}

Evdokimov, A. ^{[5
]}

Faestermann, T. ^{[12
]}

Farinon, F. ^{[5
]}

Galaviz, D. ^{[13
]}

Garcia, A. R. ^{[8
]}

Geissel, H. ^{[5
,10
]}

Gelletly, W. ^{[7
]}

Gernhaeuser, R. ^{[12
]}

Gomez-Hornillos, M. B. ^{[1
]}

Guerrero, C. ^{[14
,15
]}

Heil, M. ^{[5
]}

Hinke, C. ^{[12
]}

Knoebel, R. ^{[5
]}

Kojouharov, I. ^{[5
]}

Kurcewicz, J. ^{[5
]}

Kurz, N. ^{[5
]}

Litvinov, Yu. A. ^{[5
]}

Maier, L. ^{[12
]}

Marganiec, J. ^{[16
]}

Marta, M. ^{[5
,10
]}

Martinez, T. ^{[8
]}

Montes, F. ^{[17
,18
]}

Mukha, I. ^{[5
]}

Napoli, D. R. ^{[19
]}

Nociforo, C. ^{[5
]}

Paradela, C. ^{[6
]}

Pietri, S. ^{[5
]}

Podolyak, Zs. ^{[7
]}

Prochazka, A. ^{[5
]}

Rice, S. ^{[7
]}

Riego, A. ^{[1
]}

Rubio, B. ^{[3
]}

Schaffner, H. ^{[5
]}

Scheidenberger, Ch. ^{[5
,10
]}

Smith, K. ^{[5
,17
,18
,20
,21
]}

Sokol, E. ^{[22
]}

机构：

[1] Univ Politecn Cataluna, DFEN, INTE, E-08028 Barcelona, Spain

[2] TRIUMF, Vancouver, BC V6T 2A3, Canada

[3] Univ Valencia, CSIC, IFIC, E-46071 Valencia, Spain

[4] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary

[5] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[6] Univ Santiago de Compostela, E-15782 Santiago De Compostela, Spain

[7] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

[8] CIEMAT, E-28040 Madrid, Spain

[9] Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland

[10] Justus Liebig Univ Giessen, D-35392 Giessen, Germany

[11] St Marys Univ, Halifax, NS B3H 3C3, Canada

[12] Tech Univ Munich, Phys Dept E12, D-85748 Garching, Germany

[13] Univ Lisbon, Ctr Fis Nucl, P-169003 Lisbon, Portugal

[14] CERN, Phys Dept, CH-1211 Geneva, Switzerland

[15] Univ Seville, E-41080 Seville, Spain

[16] ExtreMe Mater Inst, D-64291 Darmstadt, Germany

[17] Michigan State Univ, NSCL, E Lansing, MI 48824 USA

[18] Joint Inst Nucl Astrophys, Notre Dame, IN 46615 USA

[19] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy

[20] Univ Notre Dame, South Bend, IN 46556 USA

[21] Univ Tennessee, Knoxville, TN 37996 USA

[22] Joint Inst Nucl Res, Flerov Lab, Dubna 141980, Russia

[23] Inst Phys Nucl Orsay, F-91405 Orsay, France

来源：

PHYSICAL REVIEW C | 2017年 / 95卷 / 06期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

NUCLEAR-DATA SHEETS; R-PROCESS NUCLEOSYNTHESIS; 1ST MEASUREMENT; RICH ISOTOPES; GAMMA-RAYS; FISSION; SYSTEM; PRECURSORS; ELEMENTS; STATES;

D O I：

10.1103/PhysRevC.95.064322

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Background: There have been measurements on roughly 230 nuclei that are beta-delayed neutron emitters. They range from He-8 up to La-150. Apart from 210Tl, with a branching ratio of only 0.007%, no other neutron emitter has been measured beyond A = 150. Therefore, new data are needed, particularly in the region of heavy nuclei around N = 126, in order to guide theoretical models and help understand the formation of the third r-process peak at A similar to 195. Purpose: To measure both beta-decay half-lives and neutron branching ratios of several neutron-rich Au, Hg, Tl, Pb, and Bi isotopes beyond N = 126. Method: Ions of interest were produced by fragmentation of a U-238 beam, selected and identified via the GSI-FRS fragment separator. A stack of segmented silicon detectors (SIMBA) was used to measure ion implants and beta decays. An array of 30 He-3 tubes embedded in a polyethylene matrix (BELEN) was used to detect neutrons with high efficiency and selectivity. A self-triggered digital system is employed to acquire data and to enable time correlations. The latter were analyzed with an analytical model and results for the half-lives and neutron-branching ratios were derived by using the binned maximum-likelihood method. Results: Twenty new beta-decay half-lives are reported for Au204-206, Hg208-211, Tl211-216, Pb215-218, and Bi218-220, nine of them for the first time. Neutron emission probabilities are reported for Hg-210,Hg-211 and Tl211-216. Conclusions: The new beta-decay half-lives are in good agreement with previous measurements on nuclei in this region. The measured neutron emission probabilities are comparable to or smaller than values predicted by global models such as relativistic Hartree Bogoliubov plus the relativistic quasi-particle random phase approximation (RHB + RQRPA).

引用

页数：16

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