Spectroscopic investigation of 54Cr via α-transfer reaction

Document Type

Article

Publication Title

European Physical Journal A

Abstract

Low-lying states in 54Cr have been investigated via the α-transfer reaction 50Ti(7Li,t) at a bombarding energy of 20 MeV. The exclusive α-transfer channel is separated from other reaction channels through the appropriate energy gate on the complementary particle, triton. Levels of 54Cr populated exclusively by the α-transfer process could be identified up to ≈ 5 MeV excitation energy and angular momentum up to (8)+, by identifying the corresponding known γ-rays. These include multiple low-lying non-yrast 2+ and 4+ states, which would otherwise be unfavorable via fusion evaporation reactions. The feeding-subtracted γ-ray yields have been extracted to estimate the population of various excited states through the transfer process. The measured integrated transfer cross sections for all the observed yrast and non-yrast states are compared with Coupled Channels calculations using fresco to extract the α+50Ti core spectroscopic factors. For the yrast states, a higher α+core overlap is seen for the 2+ and 4+ states, while it is seen to be less favorable for the 6+ and (8)+ states when α-transfer is considered to occur predominantly as a direct one-step process to the 50Ti core ground state. The yrast 2+, and 4+ states are predominantly populated by single-step transfer, while for the states with spin ≥ 5, the possibility of core excitation followed by α-transfer shows a larger α-core overlap. For the non-yrast 0+, 2+, and 4+ states, single-step transfer shows moderate to small α-core overlap. No higher spin non-yrast states are observed.

DOI

10.1140/epja/s10050-025-01619-0

Publication Date

6-1-2025

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