Nucleon-nucleus Interactions

Rosen, Louis; Beery, J. G.; Goldhaber, Alfred S.; Auerbach, E.H.

doi:10.1038/206284a0

Cited by 20 publications

(19 citation statements)

References 4 publications

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“…A q u a n t i t y -i s d e f i n e d by: (2) ob where go? @), g 0 t 8 ) , and @g TB) a r e t h e O.M.…”

Section: Lmentioning

confidence: 99%

NUCLEON--NUCLEUS OPTICAL MODEL PARAMETERS, A > 40, E < 50 MeV.

Becchetti¹,

Greenlees²

1969

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school of P h y s i c s , ~n i v g r s i t y of Minnesota, ~i n n e a~o l i s , Minnesota 55455Proton-nucleus and neutron-nucleus s t a n d a r d o p t i c a l model parameters a r e g i v e n t h a t r e p r e s e n t , q u i t e w e l l , much of t h e e l a s t i c s c a t t e r i n g d a t a i n t h e range A>40, E < 5 0 MeV. These parameters were determined by f i t t i n g simultaneously a l a r g e sample of t h e a v a i l a b l e p r o t o n d a t a , and independently, a l a r g e sample of t h e a v a i l a b l e n e u t r o n d a t a . E x p l i c i t energy and i s o s p i n dependent terms were included and t h e i r c o e f f i c i e n t s obtained d i r e c t l y from t h e d a t a a n a l y s i s . The r e s u l t s a r e shown t o be c o n s i s t e n t w i t h t h e range and s t r e n g t h of t h e c e n t r a l and i s o s p i n components of t h e two body i n t e ra c t i o n .

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“…A q u a n t i t y -i s d e f i n e d by: (2) ob where go? @), g 0 t 8 ) , and @g TB) a r e t h e O.M.…”

Section: Lmentioning

confidence: 99%

NUCLEON--NUCLEUS OPTICAL MODEL PARAMETERS, A > 40, E < 50 MeV.

Becchetti¹,

Greenlees²

1969

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“…We have calculated the process with the neutron escaping because we are interested in the population of the ld and lp final A states with the rest of the nucleus unexcited. Rather standard parameters of Woods-Saxon potential are chosen for the neutron [4,5] in order to reproduce reasonably well the experimental levels of the high shell states in Pb. The depth of the WoodsSaxon potential for A is chosen to give the l i state at +6MeV (unbound).…”

Section: The Radial Wave Functionsmentioning

confidence: 99%

The ? particle as a probe of deeply bound single particle states in heavy nuclei

Likar

Rosina

Povh

1986

Z. Physik A - Atomic Nuclei

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Decay rates of excited states in heavy hypernuclei have been calculated using shell model wave functions. The nuclear Auger effect determines the widths of the states in most cases. The exception is the radiative decay for the A particle in the 1 p and in exceptional cases also 1 d shell. In general, the natural widths of the highly excited states below the threshold for the A emission are smaller than the spacing between the A shells. Spectroscopy of A bound states in heavy hypernuclei thus seems to be feasible. PACS : 21.60Cs; 14.20.Jn MotivationExperimental methods of nuclear spectroscopy are very suitable to investigate the properties of the valence nucleons and the collective nuclear behaviour. Less satisfactory are the methods to study the properties of the deeply bound nucleons. The best way to look at them is by use of the (p,2p), (e,e'p) and in some respect also the pickup reactions. They do supply us, however, with quantitative information only on the nucleons of the last minus one nuclear shell. There is no direct experimental evidence that in heavy nuclei like lead a classification of the nucleons in ls, lp, ld2s shells is justified. Related to the question of the deeply bound nucleons, but much more restrictive, is the question of how well the single particle description of a valence nucleon is valid in the region of the central nuclear density. Recently, a set of the measurements of the electric form factors of lead and bismuth isotopes are tried to determine in how far the charge distribution of the valence 3s proton in bismuth does really correspond to the 3s charge distribution of a single particle also at distances smaller than l fm from the nuclear centre. On the other hand, the A particle in the nucleus fulfills the main requirements of an excellent probe of the particle behaviour in the central nuclear region. After being captured in a nucleus the A particle cascades eventually into its ground state. The lifetime "c~10-1~ of the A particle in the nucleus is long enough that its weak decay AN~2N or A~zN takes place in the l s ground state. It is rather natural to assume that the A particle and the nucleon will show similar behaviour in dependence of the nuclear density and that a deviation from the single particle behaviour of the A particle in the central nuclear region can be extrapolated to that of the nucleon. The aim of this paper is to discuss some of the theoretical aspects relevant to the spectroscopy of heavy hypernuclei. If experimental methods to study heavy hypernuclei should be developed, the first question to answer is how the A particle after being captured in a nucleus cascades to its ground state. For the A particle in a highly excited state the most important mechanism of deexciation is the nuclear Auger effect. For deeply bound states for which the A particle excitation is comparable to the binding energy of the valence nucleons the gamma transition takes over. In Chap. 2 we give the expressions for Auger and

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“…In the calculations, the optical model parameters of Rosen et al [9] were used. The matrix element in T d is represented by the integral:…”

Section: H'mentioning

confidence: 99%

The theoretical description of the radiative proton capture by the deformed232Th nuclide within the direct-semidirect model

Szerypo

Kicińska‐Habior

Matulewicz

1986

Z. Physik A - Atomic Nuclei

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The experimental excitation function of the 23ZTh (p,?,)z33pa reaction in the proton energy range 7-20 MeV was analysed within the direct-semidirect model. It was found that the confinement of the direct transition matrix element integral to the surface of the nucleus improves the fit of the theoretical curve to the experimental data. This conclusion was strenghtened by the calculations carried out for the 176yb(p, ~)177Lu experimental reaction cross sections, available from the literature. PACS: 25.40.LW

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Nucleon-nucleus Interactions

Cited by 20 publications

References 4 publications

NUCLEON--NUCLEUS OPTICAL MODEL PARAMETERS, A > 40, E < 50 MeV.

NUCLEON--NUCLEUS OPTICAL MODEL PARAMETERS, A > 40, E < 50 MeV.

The ? particle as a probe of deeply bound single particle states in heavy nuclei

The theoretical description of the radiative proton capture by the deformed232Th nuclide within the direct-semidirect model

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