[fluka-discuss]: FW: Problems with neutrons on nickel

From: Helmut Vincke <Helmut.Vincke_at_cern.ch>
Date: Fri, 10 Jul 2015 14:13:12 +0000

Dear Fluka authors, dear colleagues

Since I have not received an answer on my email of last Friday I assume it has been overlooked. Therefore, I allow myself to resend the question again.

Thanks for a reply in advance
Best regards
Helmut

From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Helmut Vincke
Sent: 26 June 2015 17:20
To: fluka-discuss (fluka-discuss_at_fluka.org)
Subject: [fluka-discuss]: Problems with neutrons on nickel

Dear Fluka authors, dear colleagues

By analysing an old residual nuclei result I have realized that with a previous FLUKA (2008.3c.0) version the residual nuclei results for low energy neutrons on Nickel are substantially different from those which we get with the current available FLUKA version. In contrast to the new results the old ones look very wrong. I checked the second results analytically with x sections and I get the same values.

Simulation scenario: 20 meV (~average thermal energy) neutrons are impinging on pure Nickel with reduced density. For details please see the attached simple input file.
The output of the residual nuclei are as follows:

Z

Nuclide

A

NUC/cm3/pp

error

1

H

1

7.00E-06

9.35E-07

2

He

4

4.14E-05

2.70E-06

17

Cl

36

4.00E-05

4.93E-06

18

Ar

40

7.50E-06

1.37E-06

19

K

40

2.04E-02

4.60E-05

19

K

41

4.48E-05

7.15E-06

19

K

42

1.02E-03

1.57E-05


Repeating the old run (with same input file) with the current version delivers a much more plausible result.

Z

Nuclide

A

NUC/cm3/pp

error

28

Ni

59

3.27E-02

5.12E-05

28

Ni

61

7.49E-03

4.36E-05

28

Ni

62

2.95E-04

3.41E-06

28

Ni

63

5.44E-03

1.94E-05

28

Ni

65

1.56E-04

9.15E-06



Since this result has an impact on many of my old activation studies I would like to ask you two things:


1) Can you confirm this problem with Nickel in the past?

2) Was there a similar problem with other elements in the past?

Up to now I never saw this problem since I simulate normally high energy impacts ==> the lowE result is overshadowed by high energy effects.

Thanks in advance

Best regards
Helmut




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Received on Fri Jul 10 2015 - 17:47:33 CEST

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