Dear Yang,
I can just explicitly define boron material as a mixture between
BORON-10 and BORON-11. I thick predefined boron material uses natural
boron neutron cross sections (see manual), and pointwise transport
defined only for BORON-10.
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....
MATERIAL 5. 2.37 10.BORON-10
MATERIAL 5. 2.37 11.BORON-11
MATERIAL 2.37 BOR
COMPOUND -0.199 BORON-10 -0.801 BORON-11 BOR
MATERIAL 2.52 B4C
COMPOUND 4. BOR 1. CARBON B4C
Best regards,
Mikhail
On 07.10.2018 13:42, YANG Tao wrote:
>
> Dear Duy,
>
> Thanks for your reply. I read the manual and the heavy ion transport
> can be explicitly actived by add a card:
>
> IONTRANS HEAVYION
>
> So I don't think FLUKA could only transport the light particles (α or
> lighter particle). And in my former simulation, I use 10B4C(pure B-10,
> not natural B) as the neutron converter layer, the MATERIAL card is as
> follows:
>
> MATERIAL 5. 10. 2.37 10.BORON-10
> MATERIAL 0.0 0.0 2.52 0.0B4C
> COMPOUND 4. BORON-10 1. CARBON B4C
>
> I score the α and Li+ current and it works, I obtain the energy
> spectrum of both particle(see the attachment "10B4C.INP").The puzzled
> thing is that I can't obtain anything but just ZERO results if I
> change the B-10 to natural B, however, the abundance of B-10 in
> natural B element is about 19.8%,which is considerable high amount, so
> why I can't get anything? This is rather strange.
>
> I look forward your help and thanks once again!
>
> Best regards!
>
> Yang
>
>
> -----原始邮件-----
> *发件人:*"Trinh Ngoc-Duy" <Ngoc-Duy.Trinh_at_ganil.fr>
> *发送时间:*2018-10-07 18:18:32 (星期日)
> *收件人:* "YANG Tao" <yangt_at_ihep.ac.cn>
> *抄送:* "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
> *主题:* RE: RE: [fluka-discuss]: Problems about ion transportation
> in a neutron detector!
>
> Dear Yang Tao,
>
>
> I have just checked your file. Normally, the pointwise transport
> is automatically activated with the PRECISIOn option that you put
> in your file.
> http://www.fluka.org/content/manuals/online/LOW-NEUT.html (see What 6).
>
>
>
> 2) Yes i think that FLUKA transport only the light particles
> (alpha in your case). That is maybe the reason that you do not
> observe the 7Li in other layers.
>
>
> Duy
>
>
>
> ------------------------------------------------------------------------
> *De :* YANG Tao <yangt_at_ihep.ac.cn>
> *Envoyé :* dimanche 7 octobre 2018 03:30:30
> *À :* Trinh Ngoc-Duy
> *Cc :* fluka-discuss_at_fluka.org
> *Objet :* Re: RE: [fluka-discuss]: Problems about ion
> transportation in a neutron detector!
>
> Dear Duy,
>
> Thanks for your reply. I still have some problems as follows:
>
>
> 1)I want to know how to active the pointwise transport, which card
> is applied?
>
>
> 2) As the manual states "if pointwise transport has been requested
> by the user, all other charged secondaries, including fiss", does
> it mean the secondary products of (n,B) reaction will not
> transport to the next layer in my detector setting, which I want
> to score the current of these ion products leaving the last layer
> to the work gas. Maybe I don't understand this sentence, could you
> explain it?
>
> Thank you once again!
>
>
>
> best regards!
>
> Yang
>
>
>
>
> -----原始邮件-----
> *发件人:*"Trinh Ngoc-Duy" <Ngoc-Duy.Trinh_at_ganil.fr>
> *发送时间:*2018-10-07 01:04:00 (星期日)
> *收件人:* "YANG Tao" <yangt_at_ihep.ac.cn>,
> "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
> *抄送:*
> *主题:* RE: [fluka-discuss]: Problems about ion transportation
> in a neutron detector!
>
> Hello,
>
>
> Have you activated the pointwise transport ? Because following
> the FLUKA manual, we have :
>
>
> "Recoil protons and protons from N(n,p) reaction are produced
> and transported explicitly, taking into account the detailed
> kinematics of elastic scattering, continuous energy loss with
> energy straggling, delta ray production, multiple and single
> scattering.
>
> The same applies to light fragments (alpha,3-H) from neutron
> capture in 6-Li and 10-B, if pointwise transport has been
> requested by the user. All other charged secondaries,
> including fission fragments, are not transported but their
> energy is deposited at the point of interaction (kerma
> approximation)."
>
>
> Duy.
>
>
>
> ------------------------------------------------------------------------
> *De :* owner-fluka-discuss_at_mi.infn.it
> <owner-fluka-discuss_at_mi.infn.it> de la part de YANG Tao
> <yangt_at_ihep.ac.cn>
> *Envoyé :* samedi 6 octobre 2018 17:31
> *À :* fluka-discuss_at_fluka.org
> *Objet :* [fluka-discuss]: Problems about ion transportation
> in a neutron detector!
>
> Hi,everyone!
>
> Recently, I simulate a GEM type neutron detector which has a
> converter layer of *nat**B**4**C(natural B) *seen in the
> following figure, and I want to score the fluence/current of
> the (B,n) reaction products(αand Li+) to the next Al2O3 layer,
> unfortunately, I always get a ZERO result(seen in the
> attachments).The abundance of B-10 in natural B element is
> about 19.8%, so why I can't obtain a positive current value of
> αand Li+ after the nuclear reaction? I look forward your help,
> and any help is appreciated!
>
> Best Regards!
>
> Yang
>
>
>
> ------------------------------------------------------------------------
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>
>
>
> ------------------------------------------------------------------------
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Received on Mon Oct 08 2018 - 10:37:21 CEST