Lamek Hulthen

Lamek Hulthén (born December 14, 1909 , † April 25, 1995 ) was a Swedish theoretical physicist. He was a professor at KTH Stockholm .

Hulthén received his doctorate in 1938 with a thesis on theoretical solid-state physics (especially antiferromagnetism). In the 1940s and 1950s he dealt with the meson theory of nuclear forces and the derivation of a nucleon-nucleon potential both in the case of scattering and in the bound state in the simplest nucleus, the deuteron . Here the Hulthén potential (1942) is named after him. It is an approximation based on a modification of the Yukawa potential that behaves like a Coulomb potential for small distances and decreases exponentially for larger distances and with which the Schrödinger equation for the S wave can be solved exactly. It has the form:

{\ displaystyle V (r) = - V_ {0} {\ frac {e ^ {(- \ mu r)}} {1-e ^ {(- \ mu r)}}}}

and is used in addition to nuclear physics, for example, in atomic and solid-state physics.

A variation method for scattering problems is named after him (sometimes also after Walter Kohn ).

In his first scientific publication (1933) he introduced O (4) as a dynamic symmetry in the hydrogen atom.

From 1949 to 1976 he was a professor at the KTH in Stockholm, first as a professor of applied mathematics and from 1964 head of the theoretical physics department.

He was a member of the Royal Swedish Academy of Sciences and the Swedish Academy of Engineering. From 1966 to 1979 he was on the Nobel Committee for Physics (from 1975 as chairman).

He was an advisor to government committees in Sweden and to advisory organizations in the defense sector, he was on the Nordita Council and a Swedish delegate to CERN and ESRO .

From its foundation in 1970 he was the editor of Physica Scripta.

Fonts

with Masao Sugawara : The two-nucleon problem, in Siegfried Flügge , Handbuch der Physik , Volume 39, 1957
About the quantum mechanical derivation of the Balmerterme, Z. f. Physics, Volume 86, 1933, pp. 21-23
On the exchange problem of a crystal, Arkiv Mat Astr Fysik, Volume 26A, 1938, pp. 1--106 (dissertation)
On the virtual state of the deuteron, Phys. Rev., Vol. 61, 1942, p. 671
About the eigen solutions of the Schrödinger equation of the deuteron, Ark. Mat. Astron. Fys, Volume 28 A, 1942, pp. 1-12 (Hulthén Potential)
On the Sturm-Liouville problem connected with a continuous spectrum, Arkiv Mat Astr Fysik, Volume 35A, 1948, pp. 1--14
The variational principle for continuous spectra, 10th Scandinavian Mathematicians Congress (X Congrés des mathématiciens scandinaves), Copenhagen 1946, pp. 201-206
with PO Olsson: Remarks on the variational method for scattering problems, Phys. Rev., Volume 79, 1950, p. 532
with KV Laurikainen: Approximate eigensolutions of , Reviews of Modern Physics, Volume 23, 1951, pp. 1-9 ${\ displaystyle {\ frac {d ^ {2} \ phi} {dx ^ {2}}} + (a + b {\ frac {e ^ {(- x)}} {x}}) \ phi = 0 }$
with S. Skavlem: Neutron-proton scattering in the region 0-5 MeV, Phys. Rev., Vol. 87, 1952, pp. 297-303
with B. Nagel: The photodisintegration of the deuteron, Phys. Rev., Volume 90, 1953, pp. 62-69
with LT Hedin: Phenomenological eigenfunctions and potentials for the deuteron ground state, part 1, 2, Norske Vid Selsk Forh., Volume 31, 1958, Issue 3, pp. 1-5, Issue 4, pp. 1-7

Web links

Biography of Bengt Nagel at the KTH

Individual evidence

↑ Hulthén potential Encyclopedia of Mathematics
^ Hulthén Arkiv Mat Astr Fysik, 35A, 1948, pp. 1-14, Kohn's essay is Phys. Rev., Volume 74, 1948, p. 1763

personal data
SURNAME	Hulthén, Lamek
BRIEF DESCRIPTION	Swedish theoretical physicist
DATE OF BIRTH	December 14, 1909
DATE OF DEATH	April 25, 1995

[1] Hulthén potential Encyclopedia of Mathematics

[2] Hulthén Arkiv Mat Astr Fysik, 35A, 1948, pp. 1-14, Kohn's essay is Phys. Rev., Volume 74, 1948, p. 1763