Mats Andersson
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M Sc. in Physics & Computer Science, Uppsala University (Graduated 1991)10h
Was Nazi Germany “on the cusp” of acquiring atomic weaponry?
No, not anywhere even remotely close.
After the war was over in Europe, German nuclear scientists were placed
in house arrest in the south of England – all in the same house, where everything was bugged so that the British authorities could listen to
their conversations. When the bombs were dropped on Hiroshima and
Nagasaki, the scientists understood immediately what had happened.
Mats Andersson
·
Follow
M Sc. in Physics & Computer Science, Uppsala University (Graduated
1991)10h
Was Nazi Germany “on the cusp” of acquiring atomic weaponry?
No, not anywhere even remotely close.
After the war was over in Europe, German nuclear scientists were placed in house arrest in the south of England – all in the same house, where everything was bugged so that the British authorities could listen to
their conversations. When the bombs were dropped on Hiroshima and
Nagasaki, the scientists understood immediately what had happened.
<<< My theory is that the scientists understood that Boron contamination
from the purification process would poison a graphite moderator, and
gambled that uneducated Nazi officials wouldn't catch on that they were scheming to look busy without producing results. >>>
<<< My theory is that the scientists understood that Boron contamination
from the purification process would poison a graphite moderator, and
gambled that uneducated Nazi officials wouldn't catch on that they were scheming to look busy without producing results. >>>
"Keith Willshaw" wrote in message news:uil4kh$2q74t$1@dont-email.me...
On 10/11/2023 02:53, Jim Wilkins wrote:
<<< My theory is that the scientists understood that Boron
contamination from the purification process would poison a graphite
moderator, and gambled that uneducated Nazi officials wouldn't catch
on that they were scheming to look busy without producing results. >>>
Well the captured physicists at Farm Hall naively believed the British
would not be so ungentlemeny as to listen in on them but of course every single room was bugged and all conversations recorded and translated.
They got number of things spectacularly wrong including the boron issue
and the critical mass of U-235 or Plutonium needed to make a bomb. As I recall Heisenberg had told them it could be anything between tens of kilograms and tens of tons. He had not actually calculated the value as
at that time they had no working reactor and only milligrams of U-235 so
it was run as a purely academic project and the scientists under
Heisenberg accepted his figures. The simple fact is the Soviets had got further on these issues than Germany did although that was in large part
down to the information Klaus Fuchs passed on from Los Alamos.
After hearing about the Hiroshima bomb he did the full calculations and
came up with figures in the right ball park. This was down in part to
the deference to senior people within any German research project, if Heisenberg said something it was assumed to be true.
The Farm Hall Transcripts are worth a read and can be found online here. https://germanhistorydocs.ghi-dc.org/pdf/eng/English101.pdf
----------------------------
I've read the transcripts several times.
"After hearing about the Hiroshima bomb he did the full calculations and
came up with figures in the right ball park."
That's the uncertainty (Unsicherheit) that Heisenberg should be
remembered and thanked for.
I think he was purposely inflating the numbers to deceive party
officials who he knew had no alternate source for them. I suspect that
the purpose of the Copenhagen meeting with Bohr was to determine what
could plausibly and safely be falsified to sabotage the project, based
on who else Bohr knew to understand the physics. and at Farm Hall they
didn't trust each others' hidden loyalties enough admit it. As Canaris
showed there was a serious conflict in being pro-German but anti-Nazi.
On 07/11/2023 00:02, a425couple wrote:
Mats Andersson
·
Follow
M Sc. in Physics & Computer Science, Uppsala University (Graduated
1991)10h
Was Nazi Germany “on the cusp” of acquiring atomic weaponry?
No, not anywhere even remotely close.
After the war was over in Europe, German nuclear scientists were
placed in house arrest in the south of England – all in the same
house, where everything was bugged so that the British authorities
could listen to their conversations. When the bombs were dropped on
Hiroshima and Nagasaki, the scientists understood immediately what had
happened.
The reality is the German nuclear weapons was doomed from the start
because the Nazis didnt understand the concept of cooperation. Before
the USA was even in the war the British passed on all they had to the
USA. The result was developments such as the cavity magnetron which
allowed compact airborne radar meant the western allies had superior
night fighters. The Luftwaffe got tied in with group think with heavy bombers.
There was an interesting parallel in that both the Luftwaffe and RAF
tried bombers with two very powerful engines which turned out to be unreliable, He177 in Germany and the Manchester with the RAF.
Avro and the RAF ditched the Rolly-Royce Vulture and started mass
producing the Lancaster, by the end of the war 7,377 had beein built, in Germany made just 1,169 which were chronically unreliable, highly
unreliable and the loss rate from engine failure was higher than the
combat losses.
The Germans split their nuclear program into 3 each of them competing
with the other rather than sharing with their own colleagues, the result
was in 1945 they hadnt even managed to achieve criticallity and had not
even started a bomb design. Heisenberg was working on the assumption
that between 1 and 10 TONS of plutonium or U-235 was neede3d to produce
a single bomb.
After the war the Americans found that while Japan had not managed to
achieve criticallity either they were at least heading in the right direction.
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