Double-magic nature of 132Sn and 208Pb through lifetime and cross-section measurements

J M Allmond; A E Stuchbery; J R Beene; A Galindo-Uribarri; J F Liang; E Padilla-Rodal; D C Radford; R L Varner; A Ayres; J C Batchelder; A Bey; C R Bingham; M E Howard; K L Jones; B Manning; P E Mueller; C D Nesaraja; S D Pain; W A Peters; A Ratkiewicz; K T Schmitt; D Shapira; M S Smith; N J Stone; D W Stracener; C-H Yu

doi:10.1103/PhysRevLett.112.172701

Double-magic nature of 132Sn and 208Pb through lifetime and cross-section measurements

Phys Rev Lett. 2014 May 2;112(17):172701. doi: 10.1103/PhysRevLett.112.172701. Epub 2014 Apr 30.

Authors

J M Allmond¹, A E Stuchbery², J R Beene³, A Galindo-Uribarri⁴, J F Liang³, E Padilla-Rodal⁵, D C Radford³, R L Varner³, A Ayres⁶, J C Batchelder⁷, A Bey⁶, C R Bingham⁴, M E Howard⁸, K L Jones⁶, B Manning⁸, P E Mueller³, C D Nesaraja³, S D Pain³, W A Peters⁹, A Ratkiewicz⁸, K T Schmitt⁴, D Shapira³, M S Smith³, N J Stone¹⁰, D W Stracener³, C-H Yu³

Affiliations

¹ JINPA, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
² Department of Nuclear Physics, Australian National University, Canberra ACT 0200, Australia.
³ Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
⁴ Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
⁵ Instituto de Ciencias Nucleares, UNAM, AP 70-543, 04510 Mexico, D.F., Mexico.
⁶ Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
⁷ UNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA.
⁸ Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA.
⁹ Oak Ridge Associated Universities, Oak Ridge, Tennessee 37830, USA.
¹⁰ Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA and Department of Physics, Oxford University, Oxford OX1 3PU, United Kingdom.

PMID: 24836240
DOI: 10.1103/PhysRevLett.112.172701

Abstract

Single-neutron states in (133)Sn and (209)Pb, which are analogous to single-electron states outside of closed atomic shells in alkali metals, were populated by the ((9)Be, (8)Be) one-neutron transfer reaction in inverse kinematics using particle-γ coincidence spectroscopy. In addition, the s(1/2) single-neutron hole-state candidate in (131)Sn was populated by ((9)Be, (10)Be). Doubly closed-shell (132)Sn (radioactive) and (208)Pb (stable) beams were used at sub-Coulomb barrier energies of 3 MeV per nucleon. Level energies, γ-ray transitions, absolute cross sections, spectroscopic factors, asymptotic normalization coefficients, and excited-state lifetimes are reported and compared with shell-model expectations. The results include a new transition and precise level energy for the 3p(1/2) candidate in (133)Sn, new absolute cross sections for the 1h(9/2) candidate in (133)Sn and 3s(1/2) candidate in (131)Sn, and new lifetimes for excited states in (133)Sn and (209)Pb. This is the first report on excited-state lifetimes of (133)Sn, which allow for a unique test of the nuclear shell model and (132)Sn double-shell closure.