Reduction of the Spin-Orbit Splittings at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>28</mml:mn></mml:math>Shell Closure
L. GaudefroyIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceO. SorlinGANIL, BP 55027, F-14076 Caen Cedex 5, FranceD. BeaumelIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceY. BlumenfeldIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceZsolt DombrádiInstitute of Nuclear Research, H-4001 Debrecen, Pf. 51, HungaryS. FortierIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceS. FranchooIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceM. GélinGANIL, BP 55027, F-14076 Caen Cedex 5, FranceJ. GibelinIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceS. GrévyGANIL, BP 55027, F-14076 Caen Cedex 5, FranceF. HammacheIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceF. IbrahimIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceK. W. KemperDepartment of Physics, Florida State University, Tallahassee, Florida 32306, USAKarl KratzHGF Virtual Institute for Nuclear Structure and Astrophyics (VISTARS), D-55128 Mainz, GermanyS. M. LukyanovFLNR/JINR, 141980 Dubna, Moscow Region, RussiaC. MonrozeauIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceL. NalpasCEA-Saclay, DAPNIA-SPhN, F-91191 Gif sur Yvette Cedex, FranceF. NowackiIReS, Université Louis Pasteur, BP 28, F-67037 Strasbourg Cedex, FranceA. N. OstrowskiHGF Virtual Institute for Nuclear Structure and Astrophyics (VISTARS), D-55128 Mainz, GermanyTakaharu OtsukaDepartment of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033 JapanYu. É. PenionzhkevichFLNR/JINR, 141980 Dubna, Moscow Region, RussiaJ. PiekarewiczDepartment of Physics, Florida State University, Tallahassee, Florida 32306, USAE. PollaccoCEA-Saclay, DAPNIA-SPhN, F-91191 Gif sur Yvette Cedex, FranceP. Roussel‐ChomazGANIL, BP 55027, F-14076 Caen Cedex 5, FranceEvan A. RichIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceJ. A. ScarpaciIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceMarie-Hélène LaurentGANIL, BP 55027, F-14076 Caen Cedex 5, FranceD. SohlerInstitute of Nuclear Research, H-4001 Debrecen, POB 51, HungaryM. StănoiuGSI, D-64291, Darmstadt, GermanyToshio SuzukiDepartment of Physics, Nihon University, Sakurajosui, Setagaya-ku, Tokyo 156-8550, JapanE. TryggestadIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, FranceD. VerneyIPN, IN2P3-CNRS,F- 91406 Orsay Cedex, France
2006lv
ABI
Аннотация
The N = 28 shell closure has been investigated via the 46Ar(d,p)47Ar transfer reaction in inverse kinematics. Energies and spectroscopic factors of the neutron p(3/2), p(1/2), and f(5/2) states in 47Ar were determined and compared to those of the 49Ca isotone. We deduced a reduction of the N = 28 gap by 330(90) keV and spin-orbit weakenings of approximately 10(2) and 45(10)% for the f and p states, respectively. Such large variations for the f and p spin-orbit splittings could be accounted for by the proton-neutron tensor force and by the density dependence of the spin-orbit interaction, respectively. This contrasts with the picture of the spin-orbit interaction as a surface term only.
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