Isospin Properties of Nuclear Pair Correlations from the Level Structure of the Self-Conjugate Nucleus 88Ru

被引：28

作者：

Cederwall, B. ^{[1
]}

Liu, X. ^{[1
]}

Aktas, O. ^{[1
]}

Ertoprak, A. ^{[1
,2
]}

Zhang, W. ^{[1
]}

Qi, C. ^{[1
]}

Clement, E. ^{[3
]}

de France, G. ^{[3
]}

Ralet, D. ^{[4
]}

Gadea, A. ^{[5
]}

Goasduff, A. ^{[6
]}

Jaworski, G. ^{[6
,7
]}

Kuti, I. ^{[8
]}

Nyako, B. M. ^{[8
]}

Nyberg, J. ^{[9
]}

Palacz, M. ^{[7
]}

Wadsworth, R. ^{[10
]}

Valiente-Dobon, J. J. ^{[6
]}

Al-Azri, H. ^{[11
]}

Nyberg, A. Atac ^{[1
]}

Back, T. ^{[1
]}

de Angelis, G. ^{[6
]}

Doncel, M. ^{[1
,12
]}

Dudouet, J. ^{[13
]}

Gottardo, A. ^{[1
,14
]}

Jurado, M. ^{[5
]}

Ljungvall, J. ^{[4
]}

Mengoni, D. ^{[6
]}

Napoli, D. R. ^{[6
]}

Petrache, C. M. ^{[4
]}

Sohler, D. ^{[8
]}

Timar, J. ^{[8
]}

Barrientos, D. ^{[14
]}

Bednarczyk, P. ^{[15
]}

Benzoni, G. ^{[16
]}

Birkenbach, B. ^{[17
]}

Boston, A. J. ^{[18
]}

Boston, H. C. ^{[18
]}

Burrows, I. ^{[19
]}

Charles, L. ^{[20
]}

Ciemala, M. ^{[15
]}

Crespi, F. C. L. ^{[21
,22
]}

Cullen, D. M. ^{[23
]}

Desesquelles, P. ^{[24
,25
]}

Domingo-Pardo, C. ^{[26
]}

Eberth, J. ^{[17
]}

Erduran, N. ^{[27
]}

Erturk, S. ^{[28
]}

Gonzalez, V. ^{[29
]}

Goupil, J. ^{[3
]}

机构：

[1] KTH Royal Inst Technol, S-10691 Stockholm, Sweden

[2] Istanbul Univ, Fac Sci, Dept Phys, TR-34134 Istanbul, Turkey

[3] CEA DSM CNRS IN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 5, France

[4] Univ Paris Saclay, Ctr Sci Nucl & Sci Mat, CNRS, IN2P3, F-91405 Orsay, France

[5] Univ Valencia, CSIC, Inst Fis Corpuscular, E-46980 Valencia, Spain

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

[7] Univ Warsaw, Heavy Ion Lab, Ul Pasteura 5A, PL-02093 Warsaw, Poland

[8] MTA Atomki, H-4001 Debrecen, Hungary

[9] Uppsala Univ, Dept Phys & Astron, SE-75121 Uppsala, Sweden

[10] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[11] Rustaq Coll Educ, Dept Sci, Al Rustaq 329, Oman

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

[13] Univ Lyon, IPN Lyon, CNRS, IN2P3, F-69622 Villeurbanne, France

[14] CERN, CH-1211 Geneva 23, Switzerland

[15] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Ul Radzikowskiego 152, PL-31342 Krakow, Poland

[16] INFN, Sez Milano, I-20133 Milan, Italy

[17] Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany

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

[19] STFC Daresbury Lab, Warrington WA4 4AD, Cheshire, England

[20] CNRS, UNISTRA, IPHC, 23 Rue Loess, F-67200 Strasbourg, France

[21] Univ Milan, Dept Phys, I-20133 Milan, Italy

[22] INFN Milano, I-20133 Milan, Italy

[23] Univ Manchester, Nucl Phys Grp, Schuster Lab, Manchester M13 9PL, Lancs, England

[24] Univ Paris Saclay, Ctr Sci Nucl & Sci Mat, CNRS, IN2P3, F-91405 Orsay, France

[25] Univ Paris Saclay, CNRS, IN2P3, Bat 104, F-91405 Orsay, France

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

[27] Istanbul Sabahattin Zaim Univ, Fac Engn & Nat Sci, TR-34303 Istanbul, Turkey

[28] Nigde Univ, Dept Phys, TR-51240 Nigde, Turkey

[29] Univ Valencia, Dept Ingn Elect, E-46100 Valencia, Spain

[30] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

[31] Univ Paris Saclay, CEA, Irfu, F-91191 Gif Sur Yvette, France

[32] INFN Padova, I-35131 Padua, Italy

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

[34] Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy

[35] INFN Padova, I-35131 Padua, Italy

[36] Univ Lyon 1, CNRS, IN2P3, IPN Lyon, F-69622 Villeurbanne, France

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 06期

基金：

瑞典研究理事会; 英国科学技术设施理事会; 欧盟第七框架计划;

关键词：

NEUTRON; EXCITATIONS; COMPETITION; ISOSCALAR; ALIGNMENT; SYMMETRY; DESIGN;

D O I：

10.1103/PhysRevLett.124.062501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The low-lying energy spectrum of the extremely neutron-deficient self-conjugate (N = Z) nuclide Ru-88(44)44 has been measured using the combination of the Advanced Gamma Tracking Array (AGATA) spectrometer, the NEDA and Neutron Wall neutron detector arrays, and the DIAMANT charged particle detector array. Excited states in Ru-88 were populated via the Fe-54(Ar-36, 2n gamma)Ru-88* fusion-evaporation reaction at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator complex. The observed gamma-ray cascade is assigned to Ru-88 using clean prompt gamma-gamma-2-neutron coincidences in anticoincidence with the detection of charged particles, confirming and extending the previously assigned sequence of low-lying excited states. It is consistent with a moderately deformed rotating system exhibiting a band crossing at a rotational frequency that is significantly higher than standard theoretical predictions with isovector pairing, as well as observations in neighboring N > Z nuclides. The direct observation of such a "delayed" rotational alignment in a deformed N = Z nucleus is in agreement with theoretical predictions related to the presence of strong isoscalar neutron-proton pair correlations.

引用

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