Eur. Phys. J. A (2019) 55: 111
https://doi.org/10.1140/epja/i2019-12796-0

Regular Article - Experimental Physics

Sub-barrier fusion involving odd mass nuclei: The case of ³⁶S + ⁵⁰Ti, ⁵¹V

¹ Dipartimento di Fisica e Astronomia, Università di Padova, and INFN, Sez. di Padova, I-35131, Padova, Italy
² INFN, Laboratori Nazionali di Legnaro, I-35020, Legnaro (Padova), Italy
³ Department of Physics, Tohoku University, 980-8578, Sendai, Japan
⁴ Research Center for Electron Photon Science, Tohoku University, 1-2-1 Mikamine, 982-0826, Sendai, Japan
⁵ Ruder Bošković Institute, HR-10002, Zagreb, Croatia
⁶ Institute of Nuclear Physics, Polish Academy of Sciences, PL 31-342, Cracow, Poland
⁷ IPHC, CNRS-IN2P3, Université de Strasbourg, F-67037, Strasbourg Cedex 2, France
⁸ Dipartimento di Fisica, Università di Napoli, and INFN, Sez. di Napoli, I-80126, Napoli, Italy
⁹ Centre CEA de Saclay, 91190, Gif-sur-Yvette, France

^* e-mail: montagnoli@pd.infn.it

Received: 9 April 2019
Accepted: 4 June 2019
Published online: 18 July 2019

Abstract

Sub-barrier fusion of the two near-by systems ³⁶S + ⁵⁰Ti, ⁵¹V has been measured at the Laboratori Nazionali di Legnaro (INFN). Motivation for the experiment came from the possible effect of the non-zero spin of the ground state of the ⁵¹V nucleus on the sub-barrier excitation function, and in particular on the shape of the barrier distribution. No previous data were available for these two systems near the barrier. Our results show that the two measured excitation functions are very similar down to the level of 20-30μb. The same is true for the two barrier distributions. Coupled-channel calculations have been performed including the low energy excitations of both projectile and the two targets. We have indication that the low-lying levels in ⁵¹V can be interpreted in the weak-coupling scheme, that is, ⁵¹V (I) = ⁵⁰Ti(2⁺) ⊗ p(1f _7/2) and that the extra proton in the shell does not have a significant influence on sub-barrier fusion.