From Radioactivity to Modern Nuclear Physics: 125 years of ...
Transcript of From Radioactivity to Modern Nuclear Physics: 125 years of ...
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1/03/2021 Commemoration of the 125 years of the Discovery of Radioactivity 1
From Radioactivity to Modern Nuclear Physics:
125 years of discoveries
A. Lopez-Martens
Irène Joliot Curie Laboratory
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Discovery of Radioactivity (1896-1898)
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Henri Becquerel Marie Curie Pierre Curie
« In recognition of the extraordinary
services he has rendered by his
discovery of spontaneous
radioactivity »
« In recognition of the extraordinary
services they have rendered by their
joint researches on the radiation
phenomena discovered by Professor
Henri Becquerel »
Nobel Prize in Physics 1903:
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At the dawn of the 20th century
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“There is nothing new to be discovered in physics now.
All that remains is more and more precise measurement.”
attributed to William Thomson (Lord Kelvin), 1900British Association for the advancement of Science
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Constituents of matter
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John Dalton
Dalton’s billiard ball, 1803
1803 :
-matter is made of atoms
-atoms of the same element are
identical
-atoms of an element can combine with those of
other elements to form compounds
-atoms of different elements have different masses
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Classification of elements
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(1869)
Dmitri Ivanovich
Mendeleev
Regularities in the chemical
properties of the elements
Sc
Ga
Ge
The place of an element in the table is given by
the number Z (=atomic number, from AtomZahl)
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A few clouds in the sky.....
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ultraviolet catastrophe
Max Planck
Matter can only absorb or emit
radiation energy in discrete packets
proportional to the frequency of the
radiation: energy quanta
Theory of special relativity: the laws
of physics are the same for all non-
accelerating observers, and the speed
of light in a vacuum is independent of
the motion of the observers
E=mc2
Albert Einstein
Failed Michelson-Morley experiment
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The cathode tube leads the the revolution
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1895: Jean Perrin
demonstrates that cathode
rays are negatively charged
particles
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Atoms are no longer indivisible !
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John Joseph Thomson
‘plum pudding’ model
1898: J.J. Thomson measures the charge/mass ratio of the charged
particles and concludes that what he calls ‘corpuscules’ (= electrons)
are the constituents of atoms
Magnet
Electric
capacitor
plates Scale
Power supply
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From cathode rays to X rays
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Wilhelm Röntgen W. Röntgen receives the 1st Nobel Prize in Physics in 1901
1895 discovery of X rays
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From X rays to Uranium rays
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1896 discovery of a spontaneous radiation emitted by Uranium
Henri Becquerel
Uranium rays ionize the air
and cause the discharge of
an electroscope
photographic plate
uranium saltsmetal screen
with cut-out
design
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From Uranium rays to radioactivity
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1898: Marie Curie discovers that Thorium also emits Becquerel’s rays
Marie Sklodowska Curie
ionization chamber
electrometer
piezoelectric quartz
Notes aux Comptes Rendus de l’Académie des Sciences , April 1898
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1898: Pechblende is more « active » than Uranium
From Uranium rays to radioactivity
Laboratory at the Ecole de Physique et Chimie industrielle de Paris
Extraction of radium (Ba fraction)
Notes aux Comptes Rendus de l’Académie des Sciences , December 1898
Extraction of polonium (Bi fraction)
Notes aux Comptes Rendus de l’Académie des Sciences , July 1898
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Radioactivity is manifold
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N
1898 E. Rutherfod alpha, beta radiation
1900 P. Villard gamma radiation
Ernest Rutherford
Aluminium ConcretePaper
radioactive
source
= hélium ion He2+
= high energy e-
= photons - like X raysPaul Villard
S
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Atoms transform !
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1902 E. Rutherford & F. Soddy transmutation of atoms
Philosophical Transactions of the Royal Society of London, 1905
radioactivity
,
radioactivity
234Pa
Stable206Pb
234Th 230Th
238U
226Ra
222Rn
218Po
214Pb
214Po
210Pb
210Po
214Bi210Bi
234U
The rate of transmutation follows an exponential law
Frederick Soddy
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Scattering of alpha particles
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Experiment performed by H. Geiger and E. Marsden
(1909, University of Manchester)
“It was almost as incredible as if you fired a 15-inch shell at a piece of
tissue paper and it came back and hit you! ”
0.1 Ci Ra emanation
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The nucleus is born !
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16
Nuclear model
Philosophical Magazine 21, 669-688 (1911)
Num
ber
of dete
cte
d a
lpha p
art
icle
s
Scattering angle (degrees)
But, Rutherford’s atom is unstable !!
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Bohr solves the problem with Planck’s quanta
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• Electrons move around in orbits (shells) of fixed size and energy
• Known emission/absorption lines from atoms corresponds to electronic jumps from one orbit to another
Niels Bohr
Philosophical Magazine 26, 1-25 (1913)
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Dalton’s atom undermined
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More than 40 radio-elements
discovered
in 15 years
Problem: There are only 7 empty
spaces in the periodic table between Bi and U!
‘The Chemistry of Radio-Elements’, F. Soddy (1911)
1913 Frederick Soddy
Concept of isotope: radioactive elements
with different masses but with the same
chemical properties
Inseparability of certain radio-elements
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The periodic table finds its thread
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1914 Henry Moseley
Measurement of the high frequency spectra of many
elements
K emission
lines
atomic number Z = charge of the nucleus
regularities of the periodic table explained in terms of filling
of electronic shells
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Alchemist’s dream come true
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1919 E. Rutherford 1st man-made transmutation
Rutherford calls H+ proton
α + Nitrogen → Hydrogen
The nucleus is thought to be composed of A protons and (A-Z) electrons
E. Rutherford suggests the existenceof an e--p pair, which would have allthe characteristics of a neutral particleBakerian Lecture, Proc. Roy. Soc. A, 97, 374 (1920)
H+ H+
H+ H+
e-
e-
e-
e-
This information goes unnoticed around the world, except at the Cavendish Laboratory in Cambridge, where Rutherford is appointed director...
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The beginning of mass spectrometry
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Francis Aston
1919: F. Aston provides the experimental proof of the existence of isotopes
and measures isotopic abundances
He establishes that all masses (M(16O)=16) are whole
numbers, with the exception of Hydrogen (1.008) and
proposes that mass is lost to form nuclei
4 H
4He
reference lines due to H,C,O
and their compounds
A. Eddington suggests that the transformation
of H into He is the source of the sun’s energy
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The theory of decay
22
1928: G. Gamow proposes a model for decay based on
quantum mechanics
Geiger-Nuttall law (1911)
Z. Physik 51, 204 (1928)
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Antimatter
1929 : Dirac equation
relativistic electron
Special Relativity Quantum Mechanics
The Dirac equation has 2 solutions !electron
????
electron
e–
e+
anti-electron
1930: P. Dirac invents the anti-electron1932 : C. Anderson discovers the anti-
electron and calls it positron
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Discovery of the neutron
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1930-32 W. Bothe & H. Becker
discover a strange
reaction
I. Curie & F. Joliot
observe the ejection
of protons
James Chadwick
Proc. Roy. Soc., A, 136 (1932) 692
The mysterious radiation corresponds to a particle of mass ~1: the neutronionisation chamber
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The nucleus is complete !
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1898 1911 1932
The presence of neutrons in the nucleus explains the phenomenon of isotopy
Z
AXN
1932: D. Ivanenko, W. Heisenberg and E. Majorana propose models of the
nucleus composed of Z protons and N neutrons. Heisenberg introduces isospin
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Accelerators to probe the nucleus
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Cockroft-Walton voltage multiplier
J. Cockroft and E. Walton build a machine capable of
producing an accelerating voltage of 800 kVNature 129, February 1932, 242
Ernest Walton, Ernest Rutherforf, John Cockroft
1932: Cockroft and Walton “split the atom”
Nature 129, April 1932, 649
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Artificial radioactivity
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1934 discovery of artificial radioactivity
13
27Al + 2
4He® X + n+ e+
13
27Al + 2
4He® 15
30P+ n
15
30P® e+ + 14
30Si
Irène Curie et Frédéric Joliotradio-phosphorus !
1936: John H. Lawrence is the first to use an artificial radio-element for therapeutic
purposes: 32P to treat leukaemia
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The era of the neutron
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1934 E. Fermi proposes to bombard materials with neutrons
He demonstrates that nuclear transmutation occurs more readily with
slow neutrons
His group identifies 40 new radio-isotopes in 3 years
He proposes to irradiate heavy nuclei to synthesize transuranic elements and claims to
have produced the elements Z=93 et 94 (Ausonium et Hesperium)
n
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The quest for transuranic elements...
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1935-1938: Otto Hahn, Lise Meitner and Fritz
Strassmann discover a great number of new
transuranium radio-isotopes (up to Z=96)
Lise Meitner and Otto Hahn (1918)
O. Hahn and F. Strassmann, Naturwiss 27 (1939) 11
“ We must name Barium, Lanthanum and Cerium, what we called
previously Radium, Actinium and Thorium. This is a difficult decision,
which contradicts all previous nuclear physics experiments.”
Irène Curie end Pavel
Savitch claim to have
produced a substance
similar to Lanthanum
(Actinium ?)
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Fission
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L. Meitner and O. Frisch, Nautre 143 (1939) 239
1939:, Together with her nephew Otto Frisch, L. Meitner gives an explanation for the
observed phenomena: fission of uranium
This hypothesis is immediately confirmed by O. Frisch and by others (F. Joliot)O. Frisch, Nature 143 (1939) 276
N. Bohr et J.A. Wheeler develop a theory of fission based on the nuclear liquid
drop model N. Bohr et A. Wheeler, Phys. Rev. 56 (1939) 426
e-
e-
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New discoveries
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1940: G. Flerov and K. Petrzak discover spontaneous
fission while studying Uranium nuclei
Gamma
Images by J. Giovinazzo
beta +
beta -
Alpha
Fission
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Magic numbers
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Nuclei with a number of neutrons and/or protons equal to 20, 50, 82, 126 are relatively
more abundant than their neighbours
Nuclei associated with magic numbers are also exceptionally bound and give rise to
discontinuities with respect to the liquid drop energy
periodic structure of the nucleus ?
Maria G. Mayer
‘On closed shells in nuclei’, M G. Mayer Phys. Rev. 74 (1948) 235
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The question which solves the problem
S
L
‘On closed shells in nuclei. II’,
M. G. Mayer Phys. Rev. 75 (1949) 1969
Hans JensenM.G. Mayer et H.D. Jensen ‘Elementary Theory of Nuclear Shell Structure’, 1955
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Charge distribution within the nucleus
Some moments are 30 times larger than the shell-model prediction !
C.H. Townes et al., Phys. Rev. 76 (1949) 1415
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And what if valence nucleons could polarize the nucleus... ?
01/03/2021 35
James Rainwater
Distortion of the liquid drop under the influence of the
trajectories of valence nucleons to gain in stability
J. Rainwater, Phys. Rev. 79 (1950) 432
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Single-particle and collective states of the nucleus
The unified model couples the oscillations and rotations of the liquid drop to the
movement of the individual nucleons
Aage Bohr et Ben Mottelson
Golden age of nuclear spectroscopy !
or e-
A. Bohr et B. Mottelson, Kgl. Danske Videnskab. Selskab, Mat-.-fys. Medd. 27 (1953) 16
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Detection and acceleration developments
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Heavy ion beams
PMs, Scintillators & semi-conductors 160Gd(,4n)160Dy
12
10
14
12
16
14
18
16
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Extreme shapes & multiple shapes
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P.J. Twin et al., Phys. Rev. Lett. 57 (1986) 811
T. Lauritsen et al., Phys. Rev. Lett. 88 (2002) 042501
Photons energy (MeV)
A.N. Andreyev et al., Nature 405, 430 (2000)
186Pb104
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Extreme Elements
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Chemistry Department, University of Murcia
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New Features
01/03/2021 40
J. Giovinazzo et al., Phys. Rev. Lett. 89, 102501 (2002)
M. Pfützner et al., Eur. Phys. J. A14, 279 (2002)
K. Miernik et al., Phys. Rev. Lett. 99, 192501 (2007)
Magic
Not magic
I. Tanihata et al., Phys. Rev. Lett. 55, 2676 (1985)
11Li 208Pb
A. Andreyev et al., Phys. Rev. Lett. 105 (2010) 252502
222Ra
P. Buttler et al.,, Phys. Rev. Lett. 124 (2020) 042503
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125 years and 3312 nuclei later…
01/03/2021 41
M. Thoennessen et B. Sherrill, Nature 473 (2011) 25
Nuclear physics has many more surprises in store !
Start of RIBF in Japan
First stable and radioactive
beams at the next-generation
facilities SPIRAL2, RIA & FAIR,
new detectors & spectrometers
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01/03/2020 Mon exposé - Lieu - Titre 42
Thank you for your attention