Intruder structures in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Si</mi><mprescripts></mprescripts><none></none><mn>32</mn></mmultiscripts></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Al</mi><mprescripts></mprescripts><none></none><mn>29</mn></mmultiscripts></math>

J. Williams; G. Hackman; K. Starosta; R. S. Lubna; Priyanka Choudhary; Subhrajit Sahoo; P. C. Srivastava; C. Andreoiu; D. Annen; H. Asch; M. D. H. K. G. Badanage; G. C. Ball; M. Beuschlein; H. Bidaman; V. Bildstein; R. J. Coleman; A. B. Garnsworthy; B. Greaves; G. Leckenby; V. Karayonchev; M. S. Martin; C. Natzke; C. M. Petrache; A. Radich; E. Raleigh-Smith; D. Rhodes; R. Russell; M. Satrazani; P. Spagnoletti; C. E. Svensson; D. Tam; F. Wu (吴桐安; D. Yates; Z. Yu

doi:10.1103/2q1s-4517

Intruder structures in ${}^{32}{Si}$ and ${}^{29}{Al}$

J. Williams ^1,*, G. Hackman ^1,2, K. Starosta ², R. S. Lubna ³, Priyanka Choudhary ^4,†, Subhrajit Sahoo ⁴, P. C. Srivastava ⁴, C. Andreoiu ², D. Annen ² et al.

H. Asch ⁵, M. D. H. K. G. Badanage², G. C. Ball ¹, M. Beuschlein ⁶, H. Bidaman⁷, V. Bildstein ⁷, R. J. Coleman⁷, A. B. Garnsworthy¹, B. Greaves ⁷, G. Leckenby ^1,8,‡, V. Karayonchev^1,§, M. S. Martin ^5,§, C. Natzke ¹, C. M. Petrache ⁹, A. Radich⁷, E. Raleigh-Smith¹, D. Rhodes ^1,∥, R. Russell ¹⁰, M. Satrazani ^11,¶, P. Spagnoletti^2,#, C. E. Svensson^1,7, D. Tam ⁵, F. Wu (吴桐安)², D. Yates ^1,8, and Z. Yu ²

¹TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
²Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
³Facility for Rare Isotope Beams, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
⁴Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
⁵Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6
⁶Technische Universität Darmstadt, Department of Physics, Institute for Nuclear Physics, Schlossgartenstrasse 9, 64289 Darmstadt, Germany
⁷Department of Physics, University of Guelph, 50 Stone Rd E, Guelph, Ontario, Canada N1G 2W1
⁸Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
⁹Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
¹⁰University of Surrey, Guildford GU2 7XH, United Kingdom
¹¹University of Liverpool, Liverpool L69 3BX, United Kingdom

^*Contact author: ewilliams@triumf.ca
^†Present address: Department of Physics, KTH Royal Institute of Technology, Roslagstullsbacken 21 SE-106 91, Stockholm, Sweden.
^‡Present address: LP2i Bordeaux, CNRS, Université de Bordeaux, F-33170 Gradignan, France.
^§Present address: Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL 60439.
^∥Present address: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550.
^¶Present address: KU Leuven, Instituut voor Kern- en Stralingsfysica, Leuven, Belgium.
^#Present address: Department of Physics, University of Liverpool, Liverpool, United Kingdom L69 7ZE.

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Phys. Rev. C 112, 014318 – Published 18 July, 2025

DOI: https://doi.org/10.1103/2q1s-4517

Abstract

We have studied ${}^{32}{Si}$ and ${}^{29}{Al}$ using ${}^{12}C ({}^{22}{Ne}, 2 p)$ and ${}^{12}C ({}^{22}{Ne}, α p)$ fusion-evaporation reactions. In both cases, we observed significant population of high-spin structures distinct from the ground-state yrast bands. In ${}^{32}{Si}$ , most of the high-energy states feed into a $J^{π} = 5^{-}$ nanosecond isomer. In ${}^{29}{Al}$ , we identified a rotor-like negative-parity band with a $J^{π} = 7 / 2^{-}$ band-head. Doppler shift lifetime measurements were performed for all observed states. These results were compared to shell model calculations and interpreted in terms of proton and neutron cross-shell excitation.

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Intruder structures in ${}^{32}{Si}$ and ${}^{29}{Al}$

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Intruder structures in Si32 and Al29

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Intruder structures in ${}^{32}{Si}$ and ${}^{29}{Al}$