# Magnetic response of the halo nucleus $^{19}$C studied via lifetime measurement

Abstract : The first lifetime measurement used to study the magnetic response of halo nuclei is presented. The lifetime of the first excited state of the one-neutron halo nucleus 19C has been measured by two complementary Doppler-shift techniques with the Gamma-Ray Energy Tracking In-beam Nuclear Array (GRETINA). The B(M1; 3/2+ →1/2+g.s.) strength of 3.21(25)×10−3μ2 N determined for this decay represents a strongly hindered M1 transition among light nuclei. Shell-model calculations predict a strong hindrance due to the near-degeneracy of the s1/2 and d5/2 orbitals among neutron-rich carbon isotopes, while tensor corrections and loosely bound effects are necessary to account for the remaining strength.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01145813
Contributor : Michel Lion <>
Submitted on : Monday, April 27, 2015 - 9:45:39 AM
Last modification on : Sunday, February 14, 2021 - 8:32:02 PM

### Citation

K. Whitmore, D. Smalley, H. Iwasaki, T. Suzuki, V. M. Bader, et al.. Magnetic response of the halo nucleus $^{19}$C studied via lifetime measurement. Physical Review C, American Physical Society, 2015, 91 (4), pp.041303(R). ⟨10.1103/PhysRevC.91.041303⟩. ⟨in2p3-01145813⟩

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