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Article
Report number	arXiv:2109.06292
Title	Evidence for enhanced neutron-proton correlations from the level structure of the $N=Z+1$ nucleus $_{43}^{87}\mathrm{Tc}_{44}$
Author(s)	Liu, X. (Royal Inst. Tech., Stockholm ; Beijing, GUCAS ; Lanzhou, Inst. Modern Phys.) ; Cederwall, B. (Royal Inst. Tech., Stockholm) ; Qi, C. (Royal Inst. Tech., Stockholm) ; Wyss, R.A. (Royal Inst. Tech., Stockholm) ; Aktas, Ö. (Royal Inst. Tech., Stockholm) ; Ertoprak, A. (Royal Inst. Tech., Stockholm) ; Zhang, W. (Royal Inst. Tech., Stockholm) ; Clément, E. (GANIL) ; de France, G. (GANIL) ; Ralet, D. (CSNSM, Orsay) ; Gadea, A. (Valencia U., IFIC) ; Goasduff, A. (INFN, Legnaro) ; Jaworski, G. (Warsaw U., Heavy Ion Lab ; INFN, Legnaro) ; Kuti, I. (Debrecen, Inst. Nucl. Res.) ; Nyakó, B.M. (Debrecen, Inst. Nucl. Res.) ; Nyberg, J. (Uppsala U.) ; Palacz, M. (Warsaw U., Heavy Ion Lab) ; Wadsworth, R. (York U., England) ; Valiente-Dobón, J.J. (INFN, Legnaro) ; Al-Azri, H. ; Ataç Nyberg, A. (Royal Inst. Tech., Stockholm) ; Bäck, T. (Royal Inst. Tech., Stockholm) ; de Angelis, G. (INFN, Legnaro) ; Doncel, M. (Stockholm U. ; Liverpool U.) ; Dudouet, J. (Lyon, IPN) ; Gottardo, A. (CSNSM, Orsay) ; Jurado, M. (Valencia U., IFIC) ; Ljungvall, J. (CSNSM, Orsay) ; Mengoni, D. (INFN, Legnaro) ; Napoli, D.R. (INFN, Legnaro) ; Petrache, C.M. (IJCLab, Orsay) ; Sohler, D. (Debrecen, Inst. Nucl. Res.) ; Timár, J. (Debrecen, Inst. Nucl. Res.) ; Barrientos, D. (CERN) ; Bednarczyk, P. (Cracow, INP) ; Benzoni, G. (INFN, Milan) ; Birkenbach, B. (Cologne U.) ; Boston, A.J. (Liverpool U.) ; Boston, H.C. (Liverpool U.) ; Burrows, I. (Daresbury) ; Charles, L. (Strasbourg, IPHC) ; Ciemala, M. (Cracow, INP) ; Crespi, F.C.L. (INFN, Milan ; Milan U.) ; Cullen, D.M. (Manchester U.) ; Désesquelles, P. (CSNSM, Orsay) ; Domingo-Pardo, C. (Valencia U., IFIC) ; Eberth, J. (Cologne U.) ; Erduran, N. (Istanbul U.) ; Ertürk, S. (Nigde U.) ; González, V. (Valencia U., Dept. Ing. Electronica) ; Goupil, J. (GANIL) ; Hess, H. (Cologne U.) ; Huyuk, T. (Valencia U., IFIC) ; Jungclaus, A. (Madrid, Inst. Estructura Materia) ; Korten, W. (IRFU, Saclay) ; Lemasson, A. (GANIL) ; Leoni, S. (Milan U.) ; Maj, A. (Cracow, INP) ; Menegazzo, R. (INFN, Padua) ; Million, B. (INFN, Milan) ; Perez-Vidal, R.M. (Valencia U., IFIC) ; Podolyàk, Zs. (Surrey U.) ; Pullia, A. (INFN, Milan ; Milan U.) ; Recchia, F. (INFN, Padua) ; Reiter, P. (Cologne U.) ; Saillant, F. (GANIL) ; Salsac, M.D. (IRFU, Saclay) ; Sanchis, E. (Valencia U., Astro. Astrophys.) ; Simpson, J. (Daresbury) ; Stezowski, O. (Lyon, IPN) ; Theisen, C. (IRFU, Saclay) ; Zielińska, M. (IRFU, Saclay)
Publication	2021-08-20
Imprint	2021-09-13
Number of pages	5
In:	Phys. Rev. C 104 (2021) L021302
DOI	10.1103/PhysRevC.104.L021302 (publication)
Subject category	Nuclear Physics - Experiment
Abstract	The low-lying excited states in the neutron-deficient $N=Z+1$ nucleus $^{87}_{43}$Tc$^{\ }_{44}$ have been studied via the fusion-evaporation reaction $^{54}$Fe($^{36}$Ar, $2n1p$)$^{87}$Tc 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 $\gamma$-rays, neutrons, and charged particles emitted in the reaction. A level scheme of $^{87}$Tc from the (9/2$^{+}_{g.s.}$) state to the (33/2$^{+}_{1}$) state was established based on 6 mutually coincident $\gamma$-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at $\hbar\omega\approx 0.50$ 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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