Second T = 3/2 state in $^9$B and the isobaric multiplet mass equation

N. J. Mukwevho; B. M. Rebeiro; D. J. Marín-Lámbarri; S. Triambak; P. Adsley; N. Y. Kheswa; R. Neveling; L. Pellegri; V. Pesudo; F. D. Smit; E. H. Akakpo; J. W. Brümmer; S. Jongile; M. Kamil; P. Z. Mabika; F. Nemulodi; J. N. Orce; P. Papka; G. F. Steyn; W. Yahia-Cherif

doi:10.1103/physrevc.98.051302

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arXiv · 1810.02392

Second T = 3/2 state in $^9$B and the isobaric multiplet mass equation

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Abstract

Recent high-precision mass measurements and shell model calculations~[Phys. Rev. Lett. {\bf 108}, 212501 (2012)] have challenged a longstanding explanation for the requirement of a cubic isobaric multiplet mass equation for the lowest $A = 9$ isospin quartet. The conclusions relied upon the choice of the excitation energy for the second $T = 3/2$ state in $^9$B, which had two conflicting measurements prior to this work. We remeasured the energy of the state using the $^9{\rm Be}(^3{\rm He},t)$ reaction and significantly disagree with the most recent measurement. Our result supports the contention that continuum coupling in the most proton-rich member of the quartet is not the predominant reason for the large cubic term required for $A = 9$ nuclei.

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N. J. Mukwevho, B. M. Rebeiro, D. J. Marín-Lámbarri, S. Triambak, P. Adsley, N. Y. Kheswa, R. Neveling, L. Pellegri, V. Pesudo, F. D. Smit, E. H. Akakpo, J. W. Brümmer, S. Jongile, M. Kamil, P. Z. Mabika, F. Nemulodi, J. N. Orce, P. Papka, G. F. Steyn, W. Yahia-Cherif. 2018-10-04. Second T = 3/2 state in $^9$B and the isobaric multiplet mass equation. https://doi.org/10.1103/physrevc.98.051302

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