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  • 1
    Electronic Resource
    Electronic Resource
    RESULTS FROM SHELL-MODEL MONTE CARLO STUDIES1 (1997)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 47 (1997), S. 463-504 
    Details
    ISSN: 0163-8998
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Notes: Abstract We review results obtained using Shell-Model Monte Carlo (SMMC) techniques. These methods reduce the imaginary-time many-body evolution operator to a coherent superposition of one-body evolutions in fluctuating one-body fields; the resultant path integral is evaluated stochastically. After a brief review of the methods, we discuss a variety of nuclear-physics applications. These include studies of the ground-state properties of pf-shell nuclei, Gamow-Teller strength distributions, thermal and rotational pairing properties of nuclei near N = Z, gamma-soft nuclei, and betabeta-decay in 76Ge. Several other illustrative calculations are also reviewed. Finally, we discuss prospects for further progress in SMMC and related calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.nucl.47.1.463
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of target surface-properties from high-resolution ion-beam experiments (1990)
    Springer
    The European physical journal 336 (1990), S. 361-362 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By analyzing the thick target yield curve of resonant (p,γ) reactions on23Na and26Mg for various target temperatures within a Monte Carlo approach, we are able to define the Debye and Einstein temperature of the target material in the surface region. The obtained surface temperatures are noticeably higher than the respective calorimetric values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292871
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  • 3
    Electronic Resource
    Electronic Resource
    Monte Carlo simulations of the Lewis effect (1990)
    Springer
    The European physical journal 336 (1990), S. 403-410 
    Details
    ISSN: 1434-601X
    Keywords: 34.50.Bw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent experiments measuring the thick-target yield curve of narrow resonances in (p, γ) reactions on23Na,26Mg and27Al nuclei clearly show the Lewis effect. We have studied this effect theoretically on the basis of a Monte Carlo simulation of the nuclear and electronic energy loss curve in the target. We are able to reproduce the experimental data qualitatively. We discuss possible implications of precision measurements of the Lewis effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294114
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  • 4
    Electronic Resource
    Electronic Resource
    Microscopic study of the low-energy3He(3He, 2p)4He and3H(3H, 2n)4He fusion cross sections (1991)
    Springer
    The European physical journal 339 (1991), S. 249-253 
    Details
    ISSN: 1434-601X
    Keywords: 25.10.+ s ; 25.55.e ; 25.55.Ek
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have calculated the3He(3He, 2p)4He and3H(3H, 2n)4He reaction cross sections at low energies within the microscopic multichannel resonating group method. For both reactions, we find good agreement with experiment. For the3H(3H, 2n)4He reaction, our calculated energy dependence reproduces that of each individual low-energy experimental data set, except for a normalization constant. Using this fact, we derive at a low-energy3H(3H, 2n)4He rate by taking the averaged mean of these fits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284060
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  • 5
    Electronic Resource
    Electronic Resource
    Theoretical evidence for di-molecular rotational behaviour in the hypernuclei ∑ 8 Li and ∑ 8 Be (1991)
    Springer
    The European physical journal 339 (1991), S. 523-530 
    Details
    ISSN: 1434-601X
    Keywords: 21.80.+a ; 21.60.Gx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have performed microscopic cluster studies of light∑-hypernuclei based on effective nucleon-nucleon and two different sigma-nucleon interactions. Our calculation confirms a bound 0+ state in ∑ 4 He and ∑ 4 H, but reveals no evidence for levels in other partial waves. We have investigated the ∑ 8 Li and ∑ 8 Be hypernuclei in a microscopic 3-cluster approach. For both hypernuclei, our calculation shows that the lowest levels in the partial wavesJ=0–4 are bound or quasibound states of collective nature and show a strong α ∑ 4 H and α + ∑ 4 He clustering. These levels form a sequence of states which can be well interpreted as arising from a rotatingα+ ∑ 4 H orα+ ∑ 4 He di-molecule. Our results are compared to those of similar studies for lightΛ-hypernuclei which do not show evidence for this kind of collective degrees of freedom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288436
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  • 6
    Electronic Resource
    Electronic Resource
    Isotopic dependence of electron screening in fusion reactions (1992)
    Springer
    The European physical journal 342 (1992), S. 471-482 
    Details
    ISSN: 1434-601X
    Keywords: 25.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fusion reactions6Li(p, α)3He,6Li(d, α)4He, and7Li(p, α)4He have been studied over the c.m. energy rangeE=10 to 1450 keV. Each reaction involved the use of hydrogen projectiles and LiF solid targets as well as Li projectiles and hydrogen molecular gas targets. In all cases the effects of electron screening on the low-energy fusion cross sections (exponential enhancement) have been observed; the effects are somewhat stronger in the case of atomicp ord projectiles compared to the case of molecularH 2 orD 2 gas targets. If isotopic effects on electron screening are negligible, all three reactions should exhibit the same enhancements for each set of experimental techniques. The measurements confirmed this expectation to a large extent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294958
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  • 7
    Electronic Resource
    Electronic Resource
    Consistent microscopic study of the4He(e, e′d)d reaction (1992)
    Springer
    The European physical journal 342 (1992), S. 489-490 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the4He(e,e′d)d reaction within a consistent microscopic cluster model. Our calculation reproduces theQ 2-dependence of the Nikhef data, but overestimates its magnitude. A more detailed treatment of final state interactions seems to be important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294961
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  • 8
    Electronic Resource
    Electronic Resource
    Halflife of 56Ni in cosmic rays (1999)
    Springer
    The European physical journal 5 (1999), S. 229-231 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 23.40.-s Beta decay; double beta decay; electron and muon capture – 23.40.Hc Relation with nuclear matrix elements and nuclear structure – 21.60.Cs Shell model – 27.40.+z 39 ≤ A ≤ 58 – 98.70.Sa Cosmic rays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A measurement of the 56Ni cosmic ray abundance has been discussed as a possible tool to determine the acceleration time scale of relativistic particles in cosmic rays. This conjecture will depend on the halflife of totally ionized 56Ni which can only decay by higher-order forbidden transitions. We have calculated this halflife within large-scale shell model calculations and find t 1/2≈ 4×104 years, only slightly larger than the currently available experimental lower limit, but too short for 56Ni to serve as a cosmic ray chronometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050277
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  • 9
    Electronic Resource
    Electronic Resource
    Pycnonuclear triple-alpha-fusion rate in hypernetted chain Approximation (1992)
    Springer
    The European physical journal 342 (1992), S. 133-140 
    Details
    ISSN: 1434-601X
    Keywords: 21.30 ; 67.20 ; 97.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the helium plasma in the hypernetted-chain-Approximation considering both short-ranged internuclear and long-ranged Coulomb interactions. The optimal two-particle wave function has been determined in HNC/0 approximation. The two-particle distribution functions, which have been calculated in various orders of HNC/n approximations (n=0, 4, 5), are used to determine the pycnonuclear triple-alpha-fusion rate in the density regime 108 g/cm3≤ρ≤1010 g/cm3, in which the fusing of three alpha-particles to form a12C-nucleus plays an important role in the crust evolution of an accreting old neutron star. Our calculation supports the idea that the helium liquid undergoes a phase transition to stable8Be matter at densities slightly lower thanρ≈3×109 g/ cm3 as the plasma induced screening potential then becomes strong enough to bind the8Be ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288460
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  • 10
    Electronic Resource
    Electronic Resource
    The low-energyD(α, γ)6Li and6Li+208Pb→D+α+208Pb cross sections (1991)
    Springer
    The European physical journal 339 (1991), S. 335-339 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Gx ; 23.20.−g ; 25.55.−e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have calculated theE1 andE2 contributions to the low-energyD(α,γ)6Li fusion and to the6Li+208Pb →D+α+208Pb Coulomb dissociation cross sections within a multichannel Resonating Group calculation based on many-body deuteron+α configurations and pseudo-states. For both reactions experimentally determined cross sections are reasonably well reproduced. We find that dipole capture contributes noticeably to the fusion cross sections atE≦500 keV, while it is negligible in the Coulomb dissociation data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560634
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