Quenching of Single-Particle Strength in A=15 Nuclei

B P Kay; T L Tang; I A Tolstukhin; G B Roderick; A J Mitchell; Y Ayyad; S A Bennett; J Chen; K A Chipps; H L Crawford; S J Freeman; K Garrett; M D Gott; M R Hall; C R Hoffman; H Jayatissa; A O Macchiavelli; P T MacGregor; D K Sharp; G L Wilson

doi:10.1103/PhysRevLett.129.152501

Quenching of Single-Particle Strength in A=15 Nuclei

Phys Rev Lett. 2022 Oct 7;129(15):152501. doi: 10.1103/PhysRevLett.129.152501.

Authors

B P Kay¹, T L Tang¹, I A Tolstukhin¹, G B Roderick², A J Mitchell², Y Ayyad³, S A Bennett⁴, J Chen³, K A Chipps^{5

6}, H L Crawford⁷, S J Freeman⁴, K Garrett⁴, M D Gott¹, M R Hall⁵, C R Hoffman¹, H Jayatissa¹, A O Macchiavelli⁷, P T MacGregor⁴, D K Sharp⁴, G L Wilson^{1

8}

Affiliations

¹ Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.
² Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra ACT 2601, Australia.
³ Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA.
⁴ Schuster Laboratory, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.
⁵ Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
⁶ Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
⁷ Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
⁸ Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.

PMID: 36269970
DOI: 10.1103/PhysRevLett.129.152501

Abstract

Absolute cross sections for the addition of s- and d-wave neutrons to ^{14}C and ^{14}N have been determined simultaneously via the (d,p) reaction at 10 MeV/u. The difference between the neutron and proton separation energies, ΔS, is around -20 MeV for the ^{14}C+n system and +8 MeV for ^{14}N+n. The population of the 1s_{1/2} and 0d_{5/2} orbitals for both systems is reduced by a factor of approximately 0.5 compared with the independent single-particle model, or about 0.6 when compared with the shell model. This finding strongly contrasts with results deduced from intermediate-energy knockout reactions between similar nuclei on targets of ^{9}Be and ^{12}C. The simultaneous technique used removes many systematic uncertainties.