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  • Letter
  • Open Access

Evidence for enhanced neutron-proton correlations from the level structure of the N=Z+1 nucleus Tc444387

X. Liu1,2,3,*, B. Cederwall1, C. Qi1, R. A. Wyss1, Ö. Aktas1, A. Ertoprak1,4, W. Zhang1, E. Clément5, G. de France5 et al.

D. Ralet6, A. Gadea7, A. Goasduff8, G. Jaworski8,9, I. Kuti10, B. M. Nyakó10, J. Nyberg11, M. Palacz9, R. Wadsworth12, J. J. Valiente-Dobón8, H. Al-Azri13, A. Ataç Nyberg1, T. Bäck1, G. de Angelis8, M. Doncel14,15, J. Dudouet16, A. Gottardo6, M. Jurado7, J. Ljungvall6, D. Mengoni8, D. R. Napoli8, C. M. Petrache17, D. Sohler10, J. Timár10, D. Barrientos18, P. Bednarczyk19, G. Benzoni20, B. Birkenbach21, A. J. Boston14, H. C. Boston14, I. Burrows22, L. Charles23, M. Ciemala19, F. C. L. Crespi24,20, D. M. Cullen25, P. Désesquelles26,6, C. Domingo-Pardo7, J. Eberth21, N. Erduran27, S. Ertürk28, V. González29, J. Goupil5, H. Hess21, T. Huyuk7, A. Jungclaus30, W. Korten31, A. Lemasson5, S. Leoni24,20, A. Maj19, R. Menegazzo32, B. Million20, R. M. Perez-Vidal7, Zs. Podolyàk33, A. Pullia24,20, F. Recchia32, P. Reiter21, F. Saillant5, M. D. Salsac31, E. Sanchis29, J. Simpson22, O. Stezowski16, C. Theisen31, and M. Zielińska31

  • 1Department of Physics, Royal Institute of Technology, Stockholm 104 05, Sweden
  • 2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134 Istanbul, Turkey
  • 5GANIL, CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France
  • 6Centre de Sciences Nuclèaires et Sciences de la Matière, CNRS/IN2P3, Universitè Paris-Saclay, 91405 Orsay, France
  • 7Instituto de Fìsica Corpuscular, CSIC-Universidad de Valencia, E-46980 Valencia, Spain
  • 8Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
  • 9Heavy Ion Laboratory, University of Warsaw, 02-093 Warszawa, Poland
  • 10Institute for Nuclear Research, Atomki, H-4001 Debrecen, Hungary
  • 11Department of Physics and Astronomy, Uppsala University, SE-75121 Uppsala, Sweden
  • 12Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom
  • 13Rustaq College of Education, Department of Science, 329 Al-Rustaq, Sultanate of Oman
  • 14Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
  • 15Department of Physics, Stockholm University, Stockholm 106 91, Sweden
  • 16Universitè Lyon, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
  • 17Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
  • 18CERN, CH-1211 Geneva 23, Switzerland
  • 19The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
  • 20INFN Milano, I-20133 Milano, Italy
  • 21Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
  • 22STFC Daresbury Laboratory, Daresbury, Warrington, WCNRS 4AD, United Kingdom
  • 23IPHC, UNISTRA, CNRS, 67200 Strasbourg, France
  • 24University of Milano, Department of Physics, I-20133 Milano, Italy
  • 25Nuclear Physics Group, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
  • 26CNRS-IN2P3, Universiteè Paris-Saclay, Bat 104, F-91405 Orsay Campus, France
  • 27Faculty of Engineering and Natural Sciences, Istanbul Sabahattin Zaim University, 34303, Istanbul, Turkey
  • 28Department of Physics, University of Nigde, 51240 Nigde, Turkey
  • 29Departamento de Ingenierìa Electrònica, Universitat de Valencia, 46100 Burjassot, Valencia, Spain
  • 30Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain
  • 31Irfu, CEA, Universiè Paris-Saclay, F-91191 Gif-sur-Yvette, France
  • 32INFN Padova, I-35131 Padova, Italy
  • 33Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom

  • *xiaoyuli@kth.se
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Phys. Rev. C 104, L021302 – Published 20 August, 2021

DOI: https://doi.org/10.1103/PhysRevC.104.L021302

Abstract

The low-lying excited states in the neutron-deficient N=Z+1 nucleus Tc444387 have been studied via the fusion-evaporation reaction Fe54(Ar36, 2n1p)Tc87 at the Grand Accélérateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt γ rays, neutrons, and charged particles emitted in the reaction. A level scheme of Tc87 from the (9/2g.s.+) state to the (33/21+) state was established based on six mutually coincident γ-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at ℏω≈0.50 MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around N=44 is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the N=Z line.

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Phys. Rev. C 104, L021302– Published 20 August, 2021
  • Received 16 April 2021
  • Revised 5 July 2021
  • Accepted 9 August 2021
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