Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction

W.N. Catford; C.N. Timis; R.C. Lemmon; M. Labiche; N.A. Orr; B. Fernandez-Dominguez; R. Chapman; M. Freer; M. Chartier; H. Savajols; M. Rejmund; N.L. Achouri; N. Amzal; N.I. Ashwood; T.D. Baldwin; M. Burns; L. Caballero; J.M. Casadjian; N. Curtis; G. de France; W. Gelletly; X. Liang; S.D. Pain; V.P.E. Pucknell; B. Rubio; O. Sorlin; K.M. Spohr; Ch. Theisen; D.D. Warner

doi:10.1103/PhysRevLett.104.192501

Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction

W.N. Catford, C.N. Timis, R.C. Lemmon, M. Labiche, N.A. Orr, B. Fernandez-Dominguez, R. Chapman, M. Freer, M. Chartier, H. Savajols, M. Rejmund, N.L. Achouri, N. Amzal, N.I. Ashwood, T.D. Baldwin, M. Burns, L. Caballero, J.M. Casadjian, N. Curtis, G. de FranceW. Gelletly, X. Liang, S.D. Pain, V.P.E. Pucknell, B. Rubio, O. Sorlin, K.M. Spohr, Ch. Theisen, D.D. Warner

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Abstract

The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state’s identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2− and 3/2− levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.

Original language	English
Article number	192501
Journal	Physical Review Letters
Volume	104
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.104.192501
Publication status	Published - 14 May 2010

Keywords

radioactive beams
breakup channels
neutron
decay
array

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10.1103/PhysRevLett.104.192501

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Catford, W. N., Timis, C. N., Lemmon, R. C., Labiche, M., Orr, N. A., Fernandez-Dominguez, B., Chapman, R., Freer, M., Chartier, M., Savajols, H., Rejmund, M., Achouri, N. L., Amzal, N., Ashwood, N. I., Baldwin, T. D., Burns, M., Caballero, L., Casadjian, J. M., Curtis, N., ... Warner, D. D. (2010). Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction. Physical Review Letters, 104(19), Article 192501. https://doi.org/10.1103/PhysRevLett.104.192501

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title = "Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction",

abstract = "The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state{\textquoteright}s identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2− and 3/2− levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.",

keywords = "radioactive beams, breakup channels, neutron, decay, array",

author = "W.N. Catford and C.N. Timis and R.C. Lemmon and M. Labiche and N.A. Orr and B. Fernandez-Dominguez and R. Chapman and M. Freer and M. Chartier and H. Savajols and M. Rejmund and N.L. Achouri and N. Amzal and N.I. Ashwood and T.D. Baldwin and M. Burns and L. Caballero and J.M. Casadjian and N. Curtis and {de France}, G. and W. Gelletly and X. Liang and S.D. Pain and V.P.E. Pucknell and B. Rubio and O. Sorlin and K.M. Spohr and Ch. Theisen and D.D. Warner",

year = "2010",

month = may,

day = "14",

doi = "10.1103/PhysRevLett.104.192501",

language = "English",

volume = "104",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "19",

}

Catford, WN, Timis, CN, Lemmon, RC, Labiche, M, Orr, NA, Fernandez-Dominguez, B, Chapman, R, Freer, M, Chartier, M, Savajols, H, Rejmund, M, Achouri, NL, Amzal, N, Ashwood, NI, Baldwin, TD, Burns, M, Caballero, L, Casadjian, JM, Curtis, N, de France, G, Gelletly, W, Liang, X, Pain, SD, Pucknell, VPE, Rubio, B, Sorlin, O, Spohr, KM, Theisen, C & Warner, DD 2010, 'Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction', Physical Review Letters, vol. 104, no. 19, 192501. https://doi.org/10.1103/PhysRevLett.104.192501

TY - JOUR

T1 - Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction

AU - Catford, W.N.

AU - Timis, C.N.

AU - Lemmon, R.C.

AU - Labiche, M.

AU - Orr, N.A.

AU - Fernandez-Dominguez, B.

AU - Chapman, R.

AU - Freer, M.

AU - Chartier, M.

AU - Savajols, H.

AU - Rejmund, M.

AU - Achouri, N.L.

AU - Amzal, N.

AU - Ashwood, N.I.

AU - Baldwin, T.D.

AU - Burns, M.

AU - Caballero, L.

AU - Casadjian, J.M.

AU - Curtis, N.

AU - de France, G.

AU - Gelletly, W.

AU - Liang, X.

AU - Pain, S.D.

AU - Pucknell, V.P.E.

AU - Rubio, B.

AU - Sorlin, O.

AU - Spohr, K.M.

AU - Theisen, Ch.

AU - Warner, D.D.

PY - 2010/5/14

Y1 - 2010/5/14

N2 - The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state’s identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2− and 3/2− levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.

AB - The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state’s identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2− and 3/2− levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.

KW - radioactive beams

KW - breakup channels

KW - neutron

KW - decay

KW - array

U2 - 10.1103/PhysRevLett.104.192501

DO - 10.1103/PhysRevLett.104.192501

M3 - Article

SN - 0031-9007

VL - 104

JO - Physical Review Letters

JF - Physical Review Letters

IS - 19

M1 - 192501

ER -

Migration of nuclear shell gaps studied in the d(24Ne,pγ)25Ne reaction

Abstract

Keywords

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