Spectroscopy of the T = 2 mirror nuclei 48Fe/48Ti using mirrored knockout reactions

R. Yajzey*, M. A. Bentley, E. C. Simpson, T. Haylett, S. Uthayakumaar, D. Bazin, J. Belarge, P. C. Bender, P. J. Davies, B. Elman, A. Gade, H. Iwasaki, D. Kahl, N. Kobayashi, S. M. Lenzi, B. Longfellow, S. J. Lonsdale, E. Lunderberg, L. Morris, D. R. NapoliX. Pereira-Lopez, F. Recchia, J. A. Tostevin, R. Wadsworth, D. Weisshaar

*Corresponding author for this work

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A sequence of excited states has been established for the first time in the proton-rich nucleus 48Fe (Z=26, N=22). The technique of mirrored (i.e. analogue) one-nucleon knockout reactions was applied, in which the Tz= ±2 mirror pair, 48Fe/48Ti were populated via one-neutron/one-proton knockout from the secondary beams 49Fe/49V, respectively. The analogue properties of the reactions were used to help establish the new level scheme of 48Fe. The inclusive and exclusive cross sections were determined for the populated states. Large differences between the cross sections for the two mirrored reactions were observed and have been interpreted in terms of different degrees of binding of the mirror nuclei and in the context of the recent observations of suppression of spectroscopic strength as a function of nuclear binding, for knockout reactions on light solid targets. Mirror energy differences (MED) have been determined between the analogue T=2 states and compared with the shell model predictions. MED for this mirror pair, due to their location in the shell, are especially sensitive to excitations out of the f7/2 shell, and present a stringent test of the shell-model prescription.

Original languageEnglish
Article number136757
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 10 Dec 2021

Bibliographical note

Funding Information:
Discussions with M. Spieker on data analysis are gratefully acknowledged. RY acknowledges financial support for a PhD studentship from Jazan University , Saudi Arabia. TH, SU, DK and S-JL acknowledge support from the UKRI Science and Technology Facilities Council (STFC). This work is supported by STFC under grant numbers ST/L005727/1 and ST/P003885/1 . The work was supported by the National Science Foundation (NSF) under PHY-1565546 and by the US Department of Energy (DOE), Office of Science, Office of Nuclear Physics under Grant No. DE-SC0020451 . GRETINA was funded by the DOE, Office of Science . Operation of the array at NSCL was supported by the DOE under Grant Nos. DE-SC0014537 (NSCL) and DE-AC02-05CH11231(LBNL) .

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