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Prominence of Pairing in Inclusive ($p$ ,2$p$) and ($p$, $pn$) Cross Sections from Neutron-Rich Nuclei

N. Paul 1, 2, * A. Obertelli 1, 2, 3 C Bertulani 4 A. Corsi 1 P. Doornenbal 2, 5 J. l. Rodriguez-Sanchez 1 G. Authelet 6 H. Baba 2 D. Calvet 7 F. Chateau 7 S. Chen 2 A. Delbart 8 J.-M. Gheller 6 A. Giganon 8 A. Gillibert 1 T. Isobe 2 V. Lapoux 1 M. Matsushita 9 S. Momiyama 2 T. Motobayashi 2 M. Niikura 10 H. Otsu 2 C. Peron 11 A. Peyaud 7 E. Pollacco 1 J.-Y. Rousse 11 H. Sakurai 2 C. Santamaria 1 M. Sasano 2 Y. Shiga 12 D. Steppenbeck 9 S. Takeuchi 2 R. Taniuchi 2 T. Uesaka 2 H. Wang 2 K. Yoneda 2 T. Ando 2 T. Arici 5 A. Blazhev 13 F. Browne 14 A. Bruce 14 R. Carroll 15 L. x. Chung 16 M. Cortés 2 M. Dewald 17 B. Ding 18 Zs Dombradi 19 F. Flavigny 20 S. Franchoo 20 F. Giacoppo 21 M. Górska 5 A. Gottardo 20 K. Hadynska-Klek 21 Z. Korkulu 19 S. Koyama 2 Y. Kubota 2 A. Jungclaus 22 J. Lee 23 M. Lettmann 3 B Linh 16 J. Liu 23 Z. Liu 18 C. Lizarazo 5 C. Louchart 3 R. Lozeva 24 K. Matsui 2 T. Miyazaki 2 K. Moschner 17 S. Nagamine 2 N. Nakatsuka 25 C. Nita 26 S. Nishimura 2 C. Nobs 14 L. Olivier 20 S. Ota 9 Z. Patel 15 Zs Podolyák 15 M. Rudigier 15 E. Sahin 27 T. Saito 2 C. Shand 15 P.-A Söderström 2 I Stefan 20 T. Sumikama 28 D. Suzuki 2 R. Orlandi 29 V. Vaquero 22 V. Werner 3 K. Wimmer 30 J. Wu 2 Z. Xu 23 Zs. Dombradi 19 Zs. Podolyak 15 G. Stefan 20 Zs. Vajta 19
* Corresponding author
Abstract : Fifty-five inclusive single nucleon-removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at $\sim$250 MeV=nucleon are measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons as compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting, contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semimicroscopic model predictions, highlighting the enhanced role of lowlying level densities in nucleon-removal cross sections from loosely bound nuclei
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N. Paul, A. Obertelli, C Bertulani, A. Corsi, P. Doornenbal, et al.. Prominence of Pairing in Inclusive ($p$ ,2$p$) and ($p$, $pn$) Cross Sections from Neutron-Rich Nuclei. Physical Review Letters, American Physical Society, 2019, 122, pp.162503. ⟨10.1103/PhysRevLett.122.162503⟩. ⟨cea-02122388⟩

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