Parity Nonconservation in Neutron Resonances in 238 U

  title={Parity Nonconservation in Neutron Resonances in 238 U},
  author={Benjamin E. Crawford and Judd D. Bowman and P. P. J. Delheij and C. M. Frankle and Mamiko Iinuma and J. N. Knudson and L. Y. Lowie and A. Masaike and Yusuke Matsuda and Gary E. Mitchell and S. I. Penttil{\"a} and Henk W Ch Postma and Nathan Roberson and Susan J. Seestrom and Evgenii Sharapov and Steven L. Stephenson and Y.-F. Yen and Vivian W Yuan},
Parity nonconservation (PNC) was studied for 24 p-wave neutron resonances in 238U from 10 to 300 eV by measuring the helicity dependence of the total neutron cross section with an improved experimental apparatus. Six resonances show statistically significant (greater than 2.9σ) parity violation. An analysis treating the PNC matrix elements as random variables yields a root-mean-square PNC matrix element M=0.67-0.16+0.24 meV. The corresponding weak spreading width Γw=(1.35-0.64+0.97)×10-7 eV… CONTINUE READING