Macroscopic systematics of nuclear level densities
In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, the...
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E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1980 |
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| Reproduktion: |
Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 |
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| Übergeordnetes Werk: |
in: Nuclear Physics, Section A - Amsterdam : Elsevier, 349(1980), 1-2, Seite 10-28 |
| Übergeordnetes Werk: |
volume:349 ; year:1980 ; number:1-2 ; pages:10-28 |
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NLEJ181319373 |
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| 520 | |a In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. | ||
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(DE-627)NLEJ181319373 (DE-599)GBVNLZ181319373 DE-627 ger DE-627 rakwb eng Macroscopic systematics of nuclear level densities 1980 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Kataria, S.K. oth Ramamurthy, V.S. oth in Nuclear Physics, Section A Amsterdam : Elsevier 349(1980), 1-2, Seite 10-28 (DE-627)NLEJ177217928 (DE-600)1466542-6 0375-9474 nnns volume:349 year:1980 number:1-2 pages:10-28 http://linkinghub.elsevier.com/retrieve/pii/0375-9474(80)90440-6 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 349 1980 1-2 10-28 |
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(DE-627)NLEJ181319373 (DE-599)GBVNLZ181319373 DE-627 ger DE-627 rakwb eng Macroscopic systematics of nuclear level densities 1980 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Kataria, S.K. oth Ramamurthy, V.S. oth in Nuclear Physics, Section A Amsterdam : Elsevier 349(1980), 1-2, Seite 10-28 (DE-627)NLEJ177217928 (DE-600)1466542-6 0375-9474 nnns volume:349 year:1980 number:1-2 pages:10-28 http://linkinghub.elsevier.com/retrieve/pii/0375-9474(80)90440-6 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 349 1980 1-2 10-28 |
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(DE-627)NLEJ181319373 (DE-599)GBVNLZ181319373 DE-627 ger DE-627 rakwb eng Macroscopic systematics of nuclear level densities 1980 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Kataria, S.K. oth Ramamurthy, V.S. oth in Nuclear Physics, Section A Amsterdam : Elsevier 349(1980), 1-2, Seite 10-28 (DE-627)NLEJ177217928 (DE-600)1466542-6 0375-9474 nnns volume:349 year:1980 number:1-2 pages:10-28 http://linkinghub.elsevier.com/retrieve/pii/0375-9474(80)90440-6 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 349 1980 1-2 10-28 |
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(DE-627)NLEJ181319373 (DE-599)GBVNLZ181319373 DE-627 ger DE-627 rakwb eng Macroscopic systematics of nuclear level densities 1980 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Kataria, S.K. oth Ramamurthy, V.S. oth in Nuclear Physics, Section A Amsterdam : Elsevier 349(1980), 1-2, Seite 10-28 (DE-627)NLEJ177217928 (DE-600)1466542-6 0375-9474 nnns volume:349 year:1980 number:1-2 pages:10-28 http://linkinghub.elsevier.com/retrieve/pii/0375-9474(80)90440-6 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 349 1980 1-2 10-28 |
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(DE-627)NLEJ181319373 (DE-599)GBVNLZ181319373 DE-627 ger DE-627 rakwb eng Macroscopic systematics of nuclear level densities 1980 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. Elsevier Journal Backfiles on ScienceDirect 1907 - 2002 Kataria, S.K. oth Ramamurthy, V.S. oth in Nuclear Physics, Section A Amsterdam : Elsevier 349(1980), 1-2, Seite 10-28 (DE-627)NLEJ177217928 (DE-600)1466542-6 0375-9474 nnns volume:349 year:1980 number:1-2 pages:10-28 http://linkinghub.elsevier.com/retrieve/pii/0375-9474(80)90440-6 GBV_USEFLAG_H ZDB-1-SDJ GBV_NL_ARTICLE AR 349 1980 1-2 10-28 |
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In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. |
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In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. |
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In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed. |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">NLEJ181319373</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20210706151043.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">070505s1980 xx |||||o 00| ||eng c</controlfield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)NLEJ181319373</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)GBVNLZ181319373</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Macroscopic systematics of nuclear level densities</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1980</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zzz</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">z</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zu</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">In a number of recently proposed semi-empirical nuclear level density formulae, a macroscopic-microscopic approach similar to that used in nuclear potential energy calculations has been successfully used. While the underlying macroscopic part in these formulae is the well-known Bethe expression, these fomulae differ in the treatment of the microscopic part, namely the shell and pairing effect. In the present work, we have carried out a study of the macroscopic features of the nuclear level densities on the basis of the independent-particle model of the nucleus. It was found that even after taking into account shell and pairing effects, large deviations from the predictions of the Bethe expression with a level denisty parameter a smoothly dependent on the mass number (a = αA) are present. In particular, the level density parameter a was found to be strongly dependent on the last nucleon separation energies. A simple parametrisation of a including its dependence on the separation energies is proposed. The experimental data on the neutron resonance spacings of spherical nuclei have been analysed on the basis of this parametrisation. It is shown that the predicted isospin dependence of a is consistent with the available experimental data. The deformation dependence of a is also discussed.</subfield></datafield><datafield tag="533" ind1=" " ind2=" "><subfield code="f">Elsevier Journal Backfiles on ScienceDirect 1907 - 2002</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Kataria, S.K.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Ramamurthy, V.S.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">in</subfield><subfield code="t">Nuclear Physics, Section A</subfield><subfield code="d">Amsterdam : Elsevier</subfield><subfield code="g">349(1980), 1-2, Seite 10-28</subfield><subfield code="w">(DE-627)NLEJ177217928</subfield><subfield code="w">(DE-600)1466542-6</subfield><subfield code="x">0375-9474</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:349</subfield><subfield code="g">year:1980</subfield><subfield code="g">number:1-2</subfield><subfield code="g">pages:10-28</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">http://linkinghub.elsevier.com/retrieve/pii/0375-9474(80)90440-6</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_H</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-1-SDJ</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_NL_ARTICLE</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">349</subfield><subfield code="j">1980</subfield><subfield code="e">1-2</subfield><subfield code="h">10-28</subfield></datafield></record></collection>
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