Evidence of nonstatistical neutron emission following β decay near doubly magic 132Sn

被引：1

作者：

Heideman, J. ^{[1
]}

Grzywacz, R. ^{[1
,2
]}

Xu, Z. Y. ^{[1
]}

Madurga, M. ^{[1
]}

Escher, J. E. ^{[3
]}

Kawano, T. ^{[4
]}

Algora, A. ^{[5
,6
]}

Andreyev, A. N. ^{[7
,8
]}

Benito, J. ^{[9
]}

Berry, T. ^{[10
]}

Borge, M. J. G. ^{[11
]}

Costache, C. ^{[12
]}

De Witte, H. ^{[13
]}

Fijalkowska, A. ^{[14
,15
]}

Fraile, L. M. ^{[9
]}

Fynbo, H. O. U. ^{[16
]}

Gottardo, A. ^{[17
]}

Halverson, C. ^{[1
]}

Harkness-Brennan, L. J. ^{[18
]}

Illana, A. ^{[13
,19
]}

Janiak, L. ^{[14
,20
]}

Judson, D. S. ^{[18
]}

King, T. T. ^{[1
]}

Korgul, A. ^{[14
]}

Kurtukian-Nieto, T. ^{[21
]}

Lazarus, I. ^{[22
]}

Lica, R. ^{[12
,23
]}

Lozeva, R. ^{[24
]}

Marginean, N. ^{[12
]}

Marginean, R. ^{[12
]}

Mazzocchi, C. ^{[14
]}

Mihai, C. ^{[12
]}

Mihai, R. E. ^{[12
]}

Morales, A. I. ^{[5
]}

Page, R. D. ^{[18
]}

Pakarinen, J. ^{[19
,25
]}

Piersa-Silkowska, M. ^{[14
]}

Podolyak, Zs. ^{[10
]}

Singh, M. ^{[1
]}

Sotty, C. ^{[12
]}

Stepaniuk, M. ^{[14
]}

Tengblad, O. ^{[11
]}

Turturica, A. ^{[12
]}

Van Duppen, P. ^{[13
]}

Vedia, V. ^{[9
]}

Vinals, S. ^{[11
]}

Warr, N. ^{[26
]}

Yokoyama, R. ^{[1
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Phys Div, Oak Ridge, TN 37831 USA

[3] Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94551 USA

[4] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA

[5] CSIC Univ Valencia, Inst Fis Corpuscular, E-46071 Valencia, Spain

[6] Inst Nucl Res ATOMK, Bem Ter 18-c, H-4026 Debrecen, Hungary

[7] Univ York, Dept Phys, York YO10 5DD, North Yorkshire, England

[8] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[9] Univ Complutense Madrid, Grp Fis Nucl & IPARCOS, CEI Moncloa, E-28040 Madrid, Spain

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

[11] Inst Estruct Mat, IEM CSIC, Serrano 123, E-28006 Madrid, Spain

[12] Horia Hulubei Natl Inst Phys & Nucl Engn, RO-077125 Bucharest, Romania

[13] Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Leuven, Belgium

[14] Univ Warsaw, Fac Phys, PL-02093 Warsaw, Poland

[15] Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08903 USA

[16] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[17] Univ Paris Saclay, Univ Paris Sud, CNRS, IN2P3,IPN, F-91406 Orsay, France

[18] Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, England

[19] Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland

[20] Natl Ctr Nucl Res, PL-05400 Otwock, Poland

[21] Univ Bordeaux, CNRS, UMR 5797, IN2P3, Chemin Solarium, F-33175 Gradignan, France

[22] STFC Daresbury, Warrington WA4 4AD, England

[23] CERN, EP Dept, ISOLDE, CH-1211 Geneva, Switzerland

[24] Univeristy Paris Saclay, IJCLab, CNRS IN2P3, F-91405 Orsay, France

[25] Univ Helsinki, Helsinki Inst Phys, POB 64, FIN-00014 Helsinki, Finland

[26] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[27] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Guangdong, Peoples R China

来源：

PHYSICAL REVIEW C | 2023年 / 108卷 / 02期

基金：

欧盟地平线“2020”; 中国国家自然科学基金;

关键词：

VERSATILE ARRAY; DOORWAY STATES; NUCLEAR; DETECTORS;

D O I：

10.1103/PhysRevC.108.024311

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：

Models of the beta-delayed neutron emission (beta n) assume that neutrons are emitted statistically via an intermediate compound nucleus post beta decay. Evidence to the contrary was found in an In-134 beta-decay experiment carried out at ISOLDE CERN. Neutron emission probabilities from the unbound states in Sn-134 to known low-lying, single-particle states in Sn-133 were measured. The neutron energies were determined using the time-of-flight technique, and the subsequent decay of excited states in Sn-133 was studied using gamma-ray detectors. Individual beta n probabilities were determined by correlating the relative intensities and energies of neutrons and gamma rays. The experimental data disagree with the predictions of representative statistical models which are based upon the compound nucleus postulate. Our results suggest that violation of the compound nucleus assumption may occur in beta-delayed neutron emission. This impacts the neutron-emission probabilities and other properties of nuclei participating in the r-process. A model of neutron emission, which links the observed neutron emission probabilities to nuclear shell effects, is proposed.

引用

页数：9

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