All experimental data for Super heavy nuclei

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Discussion Overview

The discussion revolves around the availability and interpretation of experimental half-life data for superheavy nuclei (SHNs) with atomic numbers Z=104 to 118. Participants seek to clarify the nature of half-life measurements in relation to different decay modes, specifically alpha decay and spontaneous fission.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests access to all available half-life data for SHNs and seeks guidance on where to find it.
  • Another participant suggests a specific website as a useful resource for half-life and decay path information.
  • Concerns are raised about the completeness of the data provided on the suggested website, particularly regarding the absence of separate half-life values for different decay modes.
  • Some participants argue that the reported half-life represents the time until 50% of the sample has decayed, regardless of the decay mode.
  • There is a discussion about the need for multiple half-life values to calculate decay probabilities for different modes, with some participants expressing confusion over how branching ratios can be determined from a single half-life measurement.
  • One participant clarifies that branching ratios are typically measured and can be used alongside the total half-life to calculate partial decay widths.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of half-life data in relation to decay modes. While some assert that only one half-life is necessary to understand decay processes, others contend that separate values are needed for accurate probability calculations. The discussion remains unresolved regarding the necessity of multiple half-life measurements.

Contextual Notes

Participants highlight limitations in the available data, particularly concerning the distinction between different decay modes and the implications for calculating decay probabilities. There is an acknowledgment that the reported half-life may not fully capture the complexities of decay processes in superheavy nuclei.

alizade
dear physicists

I need all the half life experimental data available so far, for SHNs, I mean Z=104 - 118

(T1/2)

can you help me?

where do I get access to this data?
 
Last edited by a moderator:
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This is the best site I know of:

http://www.nndc.bnl.gov/chart/reCenter.jsp?z=116&n=176
 
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phyzguy said:
This is the best site I know of:

http://www.nndc.bnl.gov/chart/reCenter.jsp?z=116&n=176
TNQ dear phyzguy

I saw the site, it is useful

However, I am also waiting for the answers of other friends
 
alizade said:
I am also waiting for the answers of other friends

If you don't tell us what about phyzguy's link that you need to know and is absent, how can we possibly steer you in the right direction?
 
Vanadium 50 said:
If you don't tell us what about phyzguy's link that you need to know and is absent, how can we possibly steer you in the right direction?

I wondered that too. It has the half-lives and the decay paths. What else are you looking for?
 
Vanadium 50 said:
If you don't tell us what about phyzguy's link that you need to know and is absent, how can we possibly steer you in the right direction?
dear Vanadium 50
let me explain
for example open following link related to in Cn283
http://www.nndc.bnl.gov/chart/reCenter.jsp?z=112&n=171

alpha decay probability is 50% and spontaneous fission probability is 50% (various nuclei are in the same condition by to distinct percentage)

but in that chart we have just 1 half life for Cn283 that is related to alpha dacay or related to spontaneous fission
so another data is absent
if 4.0 s +13-7 is belong to alpha decay then what is half life of spontaneous fission
am i right?
 
Last edited by a moderator:
phyzguy said:
I wondered that too. It has the half-lives and the decay paths. What else are you looking for?
dear phyzguy
as i said
when we have 2 or more types of decay we need 2 or more data for half life
but in that link and another references just 1 number reported as half life
may be I am wrong
 
There is just one half life. It is the time until 50% decayed, no matter which type of decay happened.

You can get partial decay widths (sometimes interpreted as a "partial half life") from the half life and the branching fractions.
 
mfb said:
There is just one half life. It is the time until 50% decayed, no matter which type of decay happened.

You can get partial decay widths (sometimes interpreted as a "partial half life") from the half life and the branching fractions.
dear mfb

Tnq 4 your reply

I think reported half life is related to dominant mode

for probability calculation we need 2 half lifes to use following formulas:

P% alpha decay =(alpha decay width)/(alpha decay width + fission width)
P% fission =(fission width)/(alpha decay width + fission width)

for using these formulas we should have both fission and alpha half lifes
 
  • #10
No, mfb is right. There is just one half-life which includes all decay modes. You're given the total decay width (from the half life) and the branching fractions, so you can calculate the partial decay widths, just like mfb said.
 
  • #11
phyzguy said:
No, mfb is right. There is just one half-life which includes all decay modes. You're given the total decay width (from the half life) and the branching fractions, so you can calculate the partial decay widths, just like mfb said.
I do not understand
Where do these percentages come from?
Is not it necessary to have 2 data to calculate percentages?
How can we calculate these branch ratios with just one half-life?
 
  • #12
The branching ratios are not calculated from the half life, they are measured, typically by counting the decays for superheavy nuclides. The half life is measured as well.
From these two measurements together you can calculate partial decay widths.
 
  • #13
Member warned that "text-speak" is not permitted at this site
mfb said:
The branching ratios are not calculated from the half life, they are measured, typically by counting the decays for superheavy nuclides. The half life is measured as well.
From these two measurements together you can calculate partial decay widths.

TNQ very much dear mfb

U R right
 

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