On 23.11.2015 15:26, YANG Tao wrote:
>
> Dear Mikhail !
>
> Thanks for your reply. Then what is the mean excitation energy of the
> mixture, is it the linear superposition of each value
> like Σi(w_i*I_i)? Assume w_i is the volumetric weight. And does this
> value should be provided by me in the input file or as default, that
> is to say, it is left blank and calculated from systematic?
>
> Best Regards,
>
> Tao Yang.
>
>
>
> ----- 原始邮件-----
> *发件人:* "Mikhail Polkovnikov <Михаил Полковников>" <pmk_at_ihep.ru>
> *发送时间:* 2015年11月23日 星期一
> *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]: MAT-PROP card
>
> On 22.11.2015 04:55, YANG Tao wrote:
>>
>> Hi, everyone!
>>
>> I used FLUKA to simulate the ionization chamber response, the
>> work gas is a mixture of argon and nitrogen gas. I creat a
>> compound card in FLUKA to set the properties for it. However, in
>> the MAT-PROP card, I have no idea of WHAT(3)-the average
>> ionization potential, is this value input by me or as default
>> (calculated from systematics)? If it is the previous case, how
>> should I obtain the value?
>>
>> Many thanks in advance.
>>
>>
>> --
>> Tao Yang, CAS.
>>
> Dear Tao Yang,
>
> Please look the mean excitation energy for natural materials at
> the PDG <http://pdg.lbl.gov/2014/AtomicNuclearProperties/>
> official site.
> For argon
> <http://pdg.lbl.gov/2014/AtomicNuclearProperties/HTML/argon_gas_Ar.html>
> gas the value is 188.0 eV, and for nitrogen
> <http://pdg.lbl.gov/2014/AtomicNuclearProperties/HTML/nitrogen_gas.html>
> it's 82 eV.
>
>
> Best regards,
> Mikhail
>
>
> --
>
> 杨涛
> 中科院高能所东莞分部（东莞中子科学中心）加速器技术部
> 地址：东莞市大朗镇中子源路1号中国散裂中子源A2栋606室
> E-mail：yangt_at_ihep.ac.cn <mailto:yangt_at_ihep.ac.cn>
> 电话：0769-38944239
> 邮编：523803
>
Dear Tao Yang,
If you use FLUKA gas materials: ARGON, NITROGEN - they already had these
values, so FLUKA could calculate mean excitation energy for the mixture
from systematics, and you don't need to use MAT-PROP card.
Best regards,
Mikhail
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Received on Mon Nov 23 2015 - 14:57:14 CET