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 A Bertulani (4) , A. Corsi (1) , P. Doornenbal (2, 5) , J. l. 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. M Bruce (14) , R. Carroll (15) , L. x. X Chung (16) , M. L 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 D Linh (16) , J. Liu (23) , Z. Liu (18) , C. Lizarazo (5) , C. Louchart (3) , Radomira Lozeva (24) , K. Matsui (2) , T. Miyazaki (2) , K. Moschner (17) , S. Nagamine (2) , N. Nakatsuka (25) , C. Nita (26) , S. Nishimura (2) , C. R Nobs (14) , L. Olivier (20) , S. Ota (9) , Z. Patel (15) , Zs Podolyák (15) , M. Rudigier (15) , E. Sahin (27) , T. y Saito (2) , C. Shand (15) , P.-A Söderström (2) , I G 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)

1 DPHN - Département de Physique Nucléaire (ex SPhN)
2 RIKEN RNC - RIKEN Nishina Center for Accelerator-Based Science [Wako]
3 TU Darmstadt - Technische Universität Darmstadt - Technical University of Darmstadt
4 Texas A&M University–Commerce
5 GSI - Helmholtz Centre for Heavy Ion Research
6 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
7 DEDIP - Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI)
8 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
9 CNS - Centre for Nuclear Study, University of Tokyo
10 Department of Applied Physics, The University of Tokyo
11 DIS - Département d'Ingénierie des Systèmes (ex SIS)
12 Rikkyo University [Tokyo]
13 Universität zu Köln = University of Cologne
14 Brighton - School of Computing, Engineering and Mathematics
15 UNIS - University of Surrey
16 Institute for Nuclear Science and Technique, VINATOM
17 Institut für Kernphysik der Universität zu Köln
18 IMP - Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
19 ATOMKI - Institute for Nuclear Research [Budapest]
20 IPNO - Institut de Physique Nucléaire d'Orsay
21 UiO - University of Oslo
22 CSIC - Spanish National Research Council [Madrid]
23 CUHK - City University of Hong Kong [Hong Kong]
24 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
25 Kyoto University
26 IFIN-HH
27 Oslo University Hospital [Oslo]
28 Tohoku University [Sendai]
29 JAEA - Japan Atomic Energy Agency [Ibaraki]
30 Department of Physics, University of Tokyo, Bunkyo, Tokyo

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

Domains: Physics [physics]; Nuclear Experiment [nucl-ex]

N. Paul, A. Obertelli, C A 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, 2019, 122, pp.162503. ⟨10.1103/PhysRevLett.122.162503⟩. ⟨cea-02122388⟩