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Absence of M2 Retardation in $^{35}Cl$: Evidence for Stronger Isospin-Mixing Effects in A=35 Mirror Nuclei

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arxiv nucl-ex/0507019 v1 pith:W2LTU2MW submitted 2005-07-13 nucl-ex

Ritesh Kshetri , Indrani Ray , P. Banerjee , R. Raut , A. Goswami , J. M. Chatterjee , S. Chattopadhyay , U. Datta Pramanik
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A. Mukherjee C.C. Dey S. Bhattacharya B. Dasmahapatra M. Saha Sarkar S. Sarkar S. Bhowal G. Ganguly K. S. Golda R. Kumar R. P. Singh S. Muralithar P. V. Madhusudhana Rao N. Madhavan J. J. Das S. Nath P. Sugathan A. Jhingan R. K. Bhowmik P. Datta P.K. Joshi H.C. Jain
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abstract

The lifetime of the 3163 keV, 7/2$^-$ isomeric state in $^{35}Cl$ that decays by a stretched M2 transition to the $3/2^+$ ground state, has been re-measured using the Doppler Shift Attenuation Method, by gating on the 1185 keV transition which directly feeds this state. This eliminates the uncertainties in the measurement arising from the direct feedings from the continuum. A mean life of 0.6$^{+0.5}_{-0.2}$ ps has been obtained from the present work. This is considerably smaller than the adopted value 45.3(6) ps. Implication of this major reduction in the lifetime has been pointed out.

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