Improving systematic predictions of  -delayed neutron emission probabilities E. A. McCutchan A.A. Sonzogni T.D. Johnson NNDC D. Abriola IAEA M. Birch,

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Presentation transcript:

Improving systematic predictions of  -delayed neutron emission probabilities E. A. McCutchan A.A. Sonzogni T.D. Johnson NNDC D. Abriola IAEA M. Birch, B. Singh McMaster

Beta-delayed neutron emission A Z+1 QQ AZAZ SnSn A-1 Z+1 QnQn  n What is it ? P n : the probability to emit a neutron following  decay

214 nuclei with measured P n values Beta-delayed neutron emission Where is it ?

Beta-delayed neutron emission Why do we care? Reactor control and post-processing of fuel r-process nucleosynthesis and abundances Basic structure physics

5 Kratz -Herrmann Formula (KHF) Cut off parameter C (MeV) even-even even-odd odd-odd Traditional systematic studies K.-L. Kratz and G. Herrmann, Z. Phys. A 263, 435 (1973) Two parameter fit with ‘a’ and ‘b’ Log-log plot gives straight line with slope=b

B. Pfeiffer et al., Prog. Nucl. Energy 41, 39 (2002). The standard for systematic studies Linear regression Weighted least-squares a = 106(38) b = 5.5(6) red  2 = 81

a = 119(42) b = 5.45(48) red  2 = 146 Audi and Meng (2011) Effect of improved Q values a = 106(38) b = 5.5(6) red  2 = 81 Masses from : Audi and Wapstra (1995)

A better parameterization? Strength function Fermi integral Applying same concept as KHF

With this approach a = (9) b = 4.87(7) red  2 = 35 a = 119(42) b = 5.45(48) red  2 = 146

A surprising correlation a = 45(6) b = 4.4(4) red  2 = 280 a = 0.037(9) b = 4.11(9) red  2 = 87

How do we do ?? KHF-2002: B. Pfeiffer et al., Prog. Nucl. Energy 41, 39 (2002). QRPA-1: P. Moller et al., Phys. Rev. C 67, (2003).

Summary New prescription for systematics of P n values Ratio of P n to T 1/2 More compact trajectory Seems to work across nuclear chart

Relevance to ENSDF Some evaluators give Pfeiffer KHF results (2002Pf04) for cases where P n has not been measured Should we replace with values from new systematics ?

Another surprising correlation P. Moller et al., Phys. Rev. C 67, (2003).