T=3/2 states in ¹³C

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B. B. Skorodumov,¹ G. V. Rogachev,² A. Aprahamian,¹ V. Z. Goldberg,³ J. J. Kolata,⁴ S. Almaraz,¹ H. Amro,⁵ E. D. Johnson,² L. O. Lamm,¹ M. Quinn,¹ A. Teymurazyan,¹ and A. Woehr¹
¹Institute for Nuclear Structure and Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
²Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
³Texas A&M University, College Station, Texas 77843, USA
⁴Physics Department, University of Notre Dame, Notre Dame, Indiana 46556, USA
⁵Physics Department, University of Michigan, Ann Arbor, Michigan 48109, USA

Received 5 May 2008; published 6 October 2008

Background:Experimental information on the structure of low-lying levels with isospin3/2 in systems with 13 nucleons can be used toevaluate the quality of modern theoretical predictions for the lightexotic systems. This level structure is poorly known at present.Purpose: Search for T=3/2 states in ¹³C was performed inthis work. Method: These states were observed in the resonanceelastic scattering of radioactive beam ¹²B on protons using thethick target inverse kinematics technique. Results: Six new states in¹³C were identified as T=3/2 states. Tentative spin-parity assignments aresuggested. Comparison to the previous knowledge of the level structureof T=3/2 A=13 system and to shell-model predictions is given.Conclusion: The elastic scattering of neutron-rich beams on proton targetis a convenient tool for isobaric analog states search. Theobserved ¹²B+p excitation function is determined by the T=3/2 statesand no features associated with T=1/2 states were found. Althoughthe level scheme of T=3/2 states in A=13 systems isstill far from being complete the emerging picture shows significantdisagreements with predictions of contemporary shell models.

URL:	http://link.aps.org/doi/10.1103/PhysRevC.78.044603
DOI:	10.1103/PhysRevC.78.044603
PACS:	21.10.-k; 24.30.-v; 27.20.+n 21.10.-k Properties of nuclei; nuclear energy levels 24.30.-v Nuclear resonance reactions 27.20.+n Properties of nuclei with 6≤A≤19 YEAR: 2008

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