Dissipative Reactions with Intermediate-Energy Beams: A Novel Approach to Populate Complex-Structure States in Rare Isotopes

A. Gade, B. A. Brown, D. Weisshaar, D. Bazin, K. W. Brown, R. J. Charity, P. Farris, A. M. Hill, J. Li, B. Longfellow, D. Rhodes, W. Reviol, and J. A. Tostevin

Phys. Rev. Lett. 129, 242501 – Published 7 December 2022

Abstract

A novel pathway for the formation of multiparticle-multihole excited states in rare isotopes is reported from highly energy- and momentum-dissipative inelastic-scattering events measured in reactions of an intermediate-energy beam of ${}^{38}{Ca}$ on a Be target. The negative-parity, complex-structure final states in ${}^{38}{Ca}$ are observed following the in-beam $γ$ -ray spectroscopy of events in the ${}^{9}{Be} ({}^{38}{Ca}, {}^{38}{Ca} + γ) X$ reaction in which the scattered projectile loses longitudinal momentum of order $Δ p_{| |} = 700 MeV / c$ . The characteristics of the observed final states are discussed and found to be consistent with the formation of excited states involving the rearrangement of multiple nucleons in a single, highly energetic projectile-target collision. Unlike the far-less-dissipative, surface-grazing reactions usually exploited for the in-beam $γ$ -ray spectroscopy of rare isotopes, these more energetic collisions appear to offer a practical pathway to nuclear-structure studies of more complex multiparticle configurations in rare isotopes—final states conventionally thought to be out of reach with high-luminosity fast-beam-induced reactions.

Received 27 August 2022
Revised 11 October 2022
Accepted 18 November 2022

DOI:https://doi.org/10.1103/PhysRevLett.129.242501

Physics Subject Headings (PhySH)

Energy levels Nuclear reactions Nuclear structure & decays

Nuclear Physics

Authors & Affiliations

A. Gade ^1,2, B. A. Brown ^1,2, D. Weisshaar ¹, D. Bazin ^1,2, K. W. Brown^1,3, R. J. Charity ⁴, P. Farris^1,2, A. M. Hill^1,2, J. Li¹, B. Longfellow^1,2,*, D. Rhodes^1,2,†, W. Reviol ⁵, and J. A. Tostevin ⁶

¹Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
²Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
³Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
⁴Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
⁵Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁶Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

^*Present address: Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
^†Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada.

Exploiting dissipative reactions to perform in-beam $γ$ -ray spectroscopy of the neutron-deficient isotopes ${}^{38, 39}{Ca}$

A. Gade, D. Weisshaar, B. A. Brown, D. Bazin, K. W. Brown, R. J. Charity, P. Farris, A. M. Hill, J. Li, B. Longfellow, D. Rhodes, W. Reviol, and J. A. Tostevin

Phys. Rev. C 106, 064303 (2022)

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Vol. 129, Iss. 24 — 9 December 2022

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