Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

Title: Evolution of the nuclear spin-orbit splitting explored via the 32Si(d,p)33Si reaction using SOLARIS

Journal Article · · Physics Letters. B
ORCiD logo [1];  [2];  [2];  [2];  [2];  [3];  [3];  [4];  [3];  [5];  [6];  [7];  [3];  [2];  [8];  [9];  [5];  [3];  [10];  [4] more »;  [2];  [11];  [3];  [3];  [3];  [9];  [12];  [12];  [13];  [12];  [14];  [3];  [14] « less
  1. Southern University of Science and Technology (SUSTech), Shenzhen (China); Argonne National Laboratory (ANL), Argonne, IL (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. Michigan State University, East Lansing, MI (United States)
  4. Universidade de Santiago de Compostela (Spain)
  5. Australian National University, Canberra (Australia)
  6. University of Manchester (United Kingdom); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  7. University of Liverpool (United Kingdom)
  8. Davidson College, NC (United States)
  9. University of Manchester (United Kingdom)
  10. Michigan State University, East Lansing, MI (United States); Hope College, Holland, MI (United States)
  11. National Institute of Nuclear Physics (INFN), Legnaro (Italy). National Laboratory of Legnaro (INFN-LNL); Universitá di Padova (Italy)
  12. University of Connecticut, Storrs, CT (United States)
  13. Louisiana State University, Baton Rouge, LA (United States)
  14. Sun Yat-Sen University, Guangzhou (China)
+ Show Author Affiliations

The spin-orbit splitting between neutron 1p orbitals at 33Si has been deduced using the single-neutron-adding (d,p) reaction in inverse kinematics with a beam of 32Si, a long-lived radioisotope. Reaction products were analyzed by the newly implemented SOLARIS spectrometer at the reaccelerated-beam facility at the National Superconducting Cyclotron Laboratory. The measurements show reasonable agreement with shell-model calculations that incorporate modern cross-shell interactions, but they contradict the prediction of proton density depletion based on relativistic mean-field theory. The evolution of the neutron 1p-shell orbitals is systematically studied using the present and existing data in the isotonic chains of N = 17, 19, and 21. In each case, a smooth decrease in the separation of the 1p3/2 - 1p1/2 orbitals is seen as the respective p-orbitals approach zero binding, suggesting that the finite nuclear potential strongly influences the evolution of nuclear structure in this region.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Australian Research Council (ARC); International Technology Center Pacific (ITC-PAC); National Science Foundation (NSF); Science and Technology Facilities Council (STFC); Spanish Ministerio de Economia y Competitividad (MINECO); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357; SC0000661; SC0009883; SC0014552; SC0020451
OSTI ID:
2526252
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Vol. 853; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (28)

A definition of the single-nucleon potential journal June 1970
Investigation of the 34S(d, p)35S reaction at Ed = 10 MeV journal August 1971
Spectroscopic information on 35S and 37S from the (d, p) reaction journal February 1984
Local and global nucleon optical models from 1 keV to 200 MeV journal January 2003
A solenoidal spectrometer for reactions in inverse kinematics
  • Wuosmaa, A. H.; Schiffer, J. P.; Back, B. B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 580, Issue 3 https://doi.org/10.1016/j.nima.2007.07.029
journal October 2007
Commissioning of the HELIOS spectrometer
  • Lighthall, J. C.; Back, B. B.; Baker, S. I.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 622, Issue 1 https://doi.org/10.1016/j.nima.2010.06.220
journal October 2010
Neutron-hole states in 131Sn and spin-orbit splitting in neutron-rich nuclei journal October 2018
Reduced spin-orbit splitting in 35Si: Weak binding or density-depletion effect? journal October 2020
Emergent phenomena induced by spin–orbit coupling at surfaces and interfaces journal November 2016
On the "Magic Numbers" in Nuclear Structure journal June 1949
On Closed Shells in Nuclei. II journal June 1949
Structure of Si 33 and the magicity of the N = 20 gap at Z = 14 journal August 2020
Evolution of single-particle structure near the N=20 island of inversion journal November 2021
Si32fromSi30(t,p) journal January 1982
ReactionAr36(d,p)Ar37 journal June 1971
Study of the ( d , p ) Reaction on Si 28 , S 32 , and Ar 36 at E d = 18.00 MeV journal November 1971
New relativistic mean-field interaction with density-dependent meson-nucleon couplings journal February 2005
New effective interaction for 0 ℏ ω shell-model calculations in the sd − pf valence space journal January 2009
Beyond-mean-field study of the possible “bubble” structure of 34 Si journal July 2012
Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect journal November 2012
Neutron2pand1fspin-orbit splittings inCa40,S36, andSi34N=20isotones: Tensor-induced and pure spin-orbit effects journal November 2015
Spin-orbit splittings of neutron states in N = 20 isotones from covariant density functionals and their extensions journal March 2017
Ab initio calculation of the potential bubble nucleus Si 34 journal March 2017
Quenching of Cross Sections in Nucleon Transfer Reactions journal July 2013
Experimental Study of the Two-Body Spin-Orbit Force in Nuclei journal January 2014
Effect of Weak Binding on the Apparent Spin-Orbit Splitting in Nuclei journal October 2017
Quadrupole Collectivity in 3 2 , 3 4 , 3 6 , 3 8 Si and the N = 20 Shell Closure journal March 1998
Evolution of the N = 20 and 28 shell gaps and two-particle-two-hole states in the FSU interaction journal December 2020

Similar Records

Valence 1⁢𝑠−0⁢𝑑 proton vacancy of the 32Si ground state
Journal Article · 2025 · Physical Review. C · OSTI ID:3019827
+22 more
Shell structure of 43S and collapse of the N = 28 shell closure
Journal Article · 2020 · Physical Review C · OSTI ID:1669897
+13 more
First high-resolution γ-ray spectroscopy of 41Si
Journal Article · 2024 · Physical Review. C · OSTI ID:2407000
+11 more

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Shell model
Single-particle energies
Spin-orbital splitting
Transfer reaction